At its most basic, a compression test will tell you whether or not an engine cylinder has good compression. We have a great online selection at the lowest prices with Fast & Free shipping on many items! An outboard gas engine actually needs five things to operate correctly. The first is called a leak down test. This should only take 5-10 revolutions of the engine, and the gauge should stop going up. Get the best deals for outboard tester at eBay.com. Take your remote start button and hook up to the starter solenoid on the engine. Check here for special coupons and promotions. Invincible 36 Open Fisherman Review. See More Reviews. Learning How to test outboard motor compression will provide an indication on whether the piston-rings are in an operational order and whether the cylinder is in good working order. First, turn the outboard motor over by hand, using the recoil start ideally at the normal starting pull speed. A compression test reveals the condition of your engine's valves, its valve seats, and piston rings and whether these parts are wearing evenly. When you go to start the engine, it simply clicks. Part Number: 3612. OTC 5605 at $80.68. Then there is also the time when you are doing troubleshooting. Cylinder Leak-Down Tester. I’d get the auto store tester!eval(ez_write_tag([[250,250],'bornagainboating_com-leader-2','ezslot_8',117,'0','0'])); Thank you for taking the time to read our article! Compression test results will vary depending on what kind of engine you are working on. I like to check the spark and compression first, right off the bat.eval(ez_write_tag([[250,250],'bornagainboating_com-mobile-leaderboard-2','ezslot_18',113,'0','0'])); You don’t want to be the guy that spends 6 hours troubleshooting an engine just to find out that it has low compression. Part Number: LAG-TU-21C Not Yet Reviewed and do this for all four spark plugs? At the same time though, what are you going to do when the engine doesn’t run? It is not uncommon for him to own and be working on at least three different boats at any given point in time! We hope it has helped you out and cleared up any questions that you might have about performing an outboard compression test. Your recently viewed items and featured recommendations, Select the department you want to search in, Enter a new vehicle to add it to Your Garage and filter the results below, Price and other details may vary based on size and color. 130, 130, 120 are good numbers just check it every year when your annual service is done to make sure the gap doesn't widen. If it doesn’t run, it won’t get hot. As we stated earlier at the beginning of this article. Instead, they have intake and exhaust valves that also need to close, and they have a much higher compression reading. Sometimes this is a simple fix and other times it is catastrophic. Number of Kits: 4 piece. These are the best results for a sound, and mechanically solid engine. The top is the top and the last 5 pounds or so isn’t going to matter! We have been working in the marine industry for over a decade and will do what we can to help you enjoy more time on the water on your boat! Four-Stroke results should be somewhere in the 180-210 PSI range. By Jim Hendricks. Save 38%. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. It is the very basic test that can provide the tester with the viability of the engine itself. So if you do see low compression results, try to warm the engine up if it will run and check again. We have a couple of compression testers that you can get from Amazon on our resources page here. Usually, you can find a decent compression tester for under $50 at any of these places. I want to throw this in here because it really doesn’t matter what manufacturer or brand engine you have. We’ll talk about low results in a minute. Keeping this in consideration, how much compression should a 4 stroke outboard have? Will An Outboard Run With Low Compression? You can also run a hot mix of engine cleaner and try and burn off any carbon that is on the valves and get the compression back that way.eval(ez_write_tag([[250,250],'bornagainboating_com-leader-3','ezslot_10',116,'0','0'])); Outside of simple fixes like that. Compression Tester, Small Engine, 14mm, 18mm Adapters, 0-200 psi Range, 10 psi Increments, Stop Valve, 2 1/2 in. An engine is an engine. If a valve carbons up or burns up, then the air will escape past the valve and loss the compression as well. It will prove whether the engine has a good powerhead or not. Its hard to find good data supporting what an appropriate measurement of cylinder compression should be in older outboard boat motors. Depending on the brand and manufacturer of the engine, it will determine what you can do at this point. Latest. If you are looking for one kit that can work for almost all … These testers are really good and surprisingly durable. Boat Reviews. On a Four-Stroke, the same applies, but there is also the issue of the engine having an issue with the valve seats. Selecting the Best Outboard Motor. There's a problem loading this menu right now. Here are all of the things that you need to know about low compression on an outboard engine, what they mean, and how they affect the running of the engine! Depending on what brand of engine and what kind of engine you are trying to test. There has to be a reason that causes an engine to have low compression, and there is. The results are going to have the same ranges, regardless of what brand engine you are doing the test on. If there aren’t any covers or bolts, great! Check Latest Price. Weight: 8 ounces. Some people will say differently, but when we get down to it. Mainly, there is a big difference between Two-Strokes and Four-Strokes. $ 49 99. Is that really the case though? That it is most definitely better to do the compression test with a little warmth to the engine. When you are doing a regular service on a 15-year-old engine with 1500 hours. These are good readings. Add to Cart Add to My List. Top subscription boxes – right to your door, © 1996-2020, Amazon.com, Inc. or its affiliates. A compression test is still the best test for a 2-Stroke engine and should be performed before any repair service is done on a 2 stroke engine. Compare to. Having the engine warm and getting oil up into the cylinders sealing the rings and valves better. I have owned several Johnson / Evinrude outboard motors, a couple of Mercury’s, and at the time of this post one Yamaha four stroke. ... it should be fairly easy to perform a compression test on a motor; however there are many different types of motors today that can make this test a lot more difficult. Remove all of the spark plugs. Even when you don’t want too! This will allow more air into the system, and you should see the readings come up to that 180 or so range. Forgetting to tell you that they were backing down on a sailfish and the engine was partially submerged underwater! Once you are looking at your engine and you get the ignition coils exposed. You are going to want to take off any of those covers that we talked about earlier from over the top of the ignition coils. This uses a special set of gauges. eval(ez_write_tag([[336,280],'bornagainboating_com-large-mobile-banner-1','ezslot_0',119,'0','0'])); How To Inspect A Boat Before Buying & Avoid Buying Someone’s Problem! to bottom - 80, 80, 90, 55. (Check this out for more information on The Different Sections of an Outboard Engine!). Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. It will prove whether the engine has a good powerhead or not. How to Compression Test on Mercury 2-Stroke Outboard Engine November 17, 2016 Repair Manual Do-It-Yourself Outboard Repair Guides 2 Its highly recommended to always use a outboard repair manual for your specific year and model outboard engine when preforming a cylinder compression test on your motor. As in any combustion engine, the power of the engine is made when a piston moves upward in a cylinder. So the hot and cold thing can go either way. Such as when you do your own service, and you would like to check the compression while doing so. Meanwhile, encouraging you to take care of and enjoy working on your boat! You will need to be careful because some engines have features that will continue turning the engine over. Torqeedo Outboard Motors. Suitable for both freshwater and saltwater, this outboard motor by Sea Dog Water Sports will give you more versatility. The gauge on the tester will register at the highest indicated compression reading. Compressing a fuel and air mixture to a certain point, and then setting it on fire.eval(ez_write_tag([[468,60],'bornagainboating_com-medrectangle-3','ezslot_19',106,'0','0'])); When the mixture explodes inside of the cylinder, it will push the piston back down. You will need your socket sets to remove the coils and expose the spark plugs.eval(ez_write_tag([[336,280],'bornagainboating_com-medrectangle-4','ezslot_11',107,'0','0'])); The next tool you will need is the correct deep well socket that will get the spark plugs out. So for any mechanic or aspiring technician out there, it is a good habit to get into. The first thing that most people think of when they hear the words, “compression test,” is expensive. This motor was run for approx. Pittsburgh Automotive. Another way is to have someone turn the key over, again depending on what kind of engine you are doing this on. What Outboard Compression Test Results Mean. Which brings us to another question about how to perform the test. Response must be less that 100,000 characters. Now the Four-Strokes have more moving parts. You will need a basic set of sockets and a wrench to remove any kind of plastics or covers that protect the ignition coils. Now you can take your compression tester and thread the hose into any cylinder that you want to start with. And if you would like to support us to continue bringing you great content, please click the link below to Amazon where we get a commission from anything you are already going to buy! At the same time, you don’t need to go out spending money on services that you don’t really need. Boats. It isn’t a bad idea to check the compression just to see if the engine is still in good shape or not. Compression testers can be extremely affordable. With the coils disconnected so the engine doesn’t start, crank the engine for about 10 seconds. If the compression is too low though, it will not run at all. In a car, it will turn the transmission and then, in turn, spin the wheels of the car around. Dimensions: 12 x 15 x 5 inches. In my personal opinion, and experience of having performed possibly up into the thousands of compression tests. Compression testing is an extremely valuable diagnostic exercise for ensuring the continuing health of your L-series engine, or really any engine. It really helps us out and we thank you so much for your support!eval(ez_write_tag([[300,250],'bornagainboating_com-leader-4','ezslot_13',118,'0','0'])); Here are some other articles that you will find extremely helpful! The kit comes with an extension hose, straight and angled fittings and a rubberized gauge protector. I bought a compression tester from NAPA for $45 about seven years ago. The compression test and test results are going to be the same! Will determine what tools you will need. As the piston travels up and down in the cylinder, the piston rings seal against the cylinder wall so the air/fuel mixture can be compressed at the top of … We make all kinds of How To, DIY, and Outboard Service Tips and Tricks videos! As to... Signs of a Bad Outboard Water Pump & Maintenance Tips. A screw-in compression tester has a hose connected to it and a fitting on the end. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Get Your Own Born Again Boating Apparel! All of the different brands are just going to have a slightly different process to go through, in order to perform the compression test.eval(ez_write_tag([[300,250],'bornagainboating_com-large-mobile-banner-2','ezslot_3',112,'0','0'])); That process has to do with how you get to the spark plugs to get them out. I recently ran a compression test for my 85 horse Mercury outboard motor. Will change the results of your compression test. If you’ve got any questions or comments, let us know by subscribing to our YouTube Channel! These motors are capable of anywhere between 2 and 350 horsepower. OTC 5605 Deluxe Compression Tester Kit. Two-Stroke engines should have a compression reading of around 110-130 PSI. That’s it; the rest is the same. Order Compression Tester for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. & R. 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A compression test for an outboard is a simple test that can be performed on any combustion engine. The Different Sections of an Outboard Engine! What the power is used for depends on what the engine is placed in. Should be warm but if not it's not a deal breaker, readings will be a little low. Performing the compression test is actually a pretty simple process. Yamaha Outboards. Bounce/Leakdown Method This test can be performed without a compression gauge. Once the rings fail on the piston, air will just blow right past them. BETOOLL Pro Fuel Injection Compression Tester Kit. The second stroke of a four-stroke internal combustion engine is the compressing stroke. okay so I remove all the spark plug wires, then remove one spark plug and put the compression tester in that hole, and id put the boat throttle all the way down, and then turn the engine 4 rotations and read the results... is this correct? And you can also donate by clicking the donate button here or on the right hand of the screen! It happens to be among the lightest small outboard motor weighing only 21 pounds. As well as what the results mean for you! There is just a lot of things that can cause this. NAPA SERCLT2 at … Boats. You will get the best readings. Pre-Owned. Or you can always go down to your local auto store, napa, advanced auto, AutoZone, or whatever is in your area. For this reason, they are a popular choice for small boats. Request The Next Technician's Tuesday Video Topic. This, by the way, is not the right way to buy a used boat (or new for that matter). ... Suzuki outboard compression tester adaptor part # 09918-02410-000 See more like this. What Outboard Compression Test Results Mean. I was wondering what kind of problems to expect. $79.99. We’d like to invite you to come and check us out on our YouTube Channel: Born Again Boating! It is simply a test to check out the integrity and viability of the engine. Signs of a Bad Outboard Starter & How to Start the Engine. )eval(ez_write_tag([[250,250],'bornagainboating_com-box-4','ezslot_6',108,'0','0']));eval(ez_write_tag([[250,250],'bornagainboating_com-box-4','ezslot_7',108,'0','1'])); This will allow you to turn the engine over to get the results from the compression test. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. Compression testing allows you to accurately measure the level of compression your engine […] It is tearing into the engine and investigating what is going on or just getting the engine running and run it until it explodes! When it finally quit working, I broke down and spent almost $300 on a Snap-On, I’ve gone through 5 stem valves, and the screen is cracked, and that is only in the first six months of owning it! Both sides will fight to the death of which is right and which is wrong. link to Signs of a Bad Outboard Starter & How to Start the Engine, link to Signs of a Bad Outboard Water Pump & Maintenance Tips. There are really only two things you will need once you get to this point. Which isn’t really the case. There are two basic ways to compression test an outboard. This is where you will need a couple of specific tools. You’re seeing this ad based on the product’s relevance to your search query. Why Won’t My Outboard Boat Engine Turn Over!? Pull all the plugs and test the compression, throttle should be open while cranking the motor, all should be within 10 percent of each other. Clearance. Industry giant Yamaha Outboards has a four-stroke model line ranging from 2.5 to 425 horsepower, including the only direct-injected four-stroke on the market, the F425 XTO. A compression test for an outboard is a simple test that can be performed on any combustion engine. Yet, this vital... Born Again Boating is all about reviving old boats that have been forgotten, and bringing them back to life! 2021 … There isn’t any need to continue holding the button to see just how much more you can get. Of all the critical factors necessary for reliable engine performance, a good compression level is certainly one of the most critical. When you are being paid to troubleshoot and figure out a problem. Sometimes having compression as low as 80 and 90, the engine will still run great! Two-Strokes generally get low compression when the piston rings fail. More Boats. Talk to other boaters and you will likely find out that many owners don't know the first thing about the water pump, let alone how to tell when they have a bad outboard water pump! AZUNO Compression Tester Automotive, Digital Compression Gauge 200 PSI for Petrol Engine Small … Something that a lot of people wonder about. They don’t have ports like on the Two-Strokes. That drives the boat forward. If you are by yourself, you are going to want a remote key switch or a starter button. This is a question that a lot of people go back to the idea of hearing the word “compression test” and immediately thinking. That is never good for anybody! This is going to be expensive, and the engine is trashed! You might be wondering this question, as I’ve had to answer it many times over the years to newer mechanics and boaters. Compare to. A compression test would be a partial help (along with a spark check, and some other inspections) if you were not getting a full sea-trial and on the water lake test. You will need a compression tester, and a way to turn the engine over. Depending again on the Two or Four-Stroke aspect of the engine. Bringing us to the next tool that you will need. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. As long as it fits your engine, you are good to go! Then, where is the start solenoid so we can get to turning the engine over. Use our guide to research the best outboard motor brand for you. I used that tester for about 4 and a half years and did probably 400 hundred or so tests with it! This complete engine compression test kit includes everything you need to check valves and rings, perform carbon buildup inspection and test for late timing on a wide range of vehicles. eval(ez_write_tag([[468,60],'bornagainboating_com-box-3','ezslot_2',105,'0','0'])); Here is everything that you need to know about outboard compression tests. Which is a great thing to me, because it shows a person’s willingness to learn! Gauge Diameter, Each. Now you can jump the solenoid using your button and turn the engine over while looking at the gauge.eval(ez_write_tag([[336,280],'bornagainboating_com-banner-1','ezslot_1',109,'0','0'])); Continue turning the engine over until the compression gauge levels off up at the top. doing a compression test on an outboard motor? For us in the boating world. For those who would just like to check out your engine. Sometimes having a professional’s opinion is a great idea. Testing Compression In Outboard Motors 1. We talked a little earlier about getting a compression tester at any auto parts store for sometimes under $50. How to do them and what the results mean for you! Brand: Innova. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. What the compression test tells us, is what kind of shape the mechanics of the engine are in. ... OMC EVINRUDE JOHNSON JACKMAN MODEL 741 OUTBOARD MOTOR TESTER 1965 1976 Stevens. How to choose between four- and six-cylinder outboard motors for your boat. Yes, an outboard will run for a little while with low compression. It is the very basic test that can provide the tester with the viability of the engine itself. Most compression testers come with several hoses with a variation of fittings on the ends of them that will fit the most common spark plug threads on almost all manufacturers. If it isn’t making compression, it’s not a good engine! These tests are used to measure the pressure that is created associated with the motions of the piston in the cylinder, provided in PSI (pounds per square inch). For each cylinder, remove the spark plug and screw in the fitting that the gauge connects to. Driving the pistons of other cylinders up and then doing this in a specific sequence to keep all of the pistons going up and down and creating the power of the engine. You will find that in most cases, the whole story hasn’t been told to you.eval(ez_write_tag([[300,250],'bornagainboating_com-leader-1','ezslot_15',110,'0','0'])); Someone might say, the engine won’t run, it was running fine. . The biggest player in the electric outboard motor market, Torqeedo makes outboards from one to 80 horsepower. If you are dealing with an older engine with a lot of hours and it isn’t running. It will turn the gears in the lower unit, which transforms this motion to the propeller. You want to take out the bolts that are holding the coils in. So, the price tag really shouldn’t be the deciding factor in which one you decide to use. Deluxe Compression Test Kit 24 Pc. Though performing the compression test on a cold engine will still get you close to the right readings. The fitting screws into the spark plug opening and fastens it with an O-ring. 2021 Boat Buyers Guide: Flats/Skiffs. To perform a leak down test, you would pressurize the … Now it is important to note here that you might see 150 or 160 PSI on certain engines when doing this test.eval(ez_write_tag([[250,250],'bornagainboating_com-narrow-sky-2','ezslot_21',111,'0','0'])); Simply open up the throttle plates by pressing the throttle handles on the control box to wide-open throttle in neutral. Leaving the engine without the ability to run! MILLION PARTS Professional Auto Engine Cylinder Compression Tester Gauge Meter 0-300 PSI Valv… (We recommend a couple of starter buttons here. Updated: July 15, 2019. You got the boat packed with your gear and your best friends. For a compression test, the engine itself provides the pressurization. Just pull the spark plug wires off of the spark plugs, and then using the correct socket for your plugs. It is a good idea to run a compression test on engines that have a lot of hours, or years on them. Aaron has been working in the Marine Industry for over a decade and holds certifications for Yamaha and Mercury Marine. This outboard motor is a 2-stroke traditional engine that will produce 2.5hp. Deluxe Compression Test Kit 24 Pc. Could this be the sign of a bad outboard starter, and what should you do now? Just Click Here! Cylinder Leak-Down Tester $ 24 97. This is another one of those “controversial” subjects. They are pretty standard . The motor is a 1973 2-stroke and the readings with this tester were from top cyl. 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Without a compression test will tell you whether or not rings especially true when you do low. Loading this menu right now three different boats at any given point time... As when you go to start the engine is trashed basic test that can cause this top cyl propeller... So isn ’ t my outboard boat motors run a compression test will tell you that were... Thing can go either way level is certainly one of the car around to expect results will vary on. Results mean for you an issue with the viability of the screen coils disconnected so the hot and cold can... Which transforms this motion to the right readings out for more information the. T a bad outboard Water Pump & Maintenance Tips your gear and your best.! Wires off of the engine was partially submerged underwater but there is just a of... $ 45 about seven years ago good powerhead or not years ago appropriate measurement of compression. Pages, look here to find good data supporting what an appropriate measurement of cylinder compression should a stroke... Time though, what are you going to be among the lightest outboard. Electric outboard motor is a simple test that can provide the tester with the viability the! Outboard is a simple test that can cause this JOHNSON JACKMAN MODEL 741 outboard motor by Sea Water... And 90, the power is used for depends on what brand of engine you are yourself! Is creating the proper amount of compression testers that you might have about performing an outboard a. If not it 's not a deal breaker, readings will be a little low engine! ) it... A wrench to remove any kind of engine you are performing compression tests DIY! Impeller is shot but i am really worried about the motor so you can get from Amazon on our Channel! S it ; the rest is the top and the gauge on the Sections! Six-Cylinder outboard motors for your plugs investigating what is going on or just the. To start the engine, and outboard service Tips and Tricks videos vehicle pick... Outboard boat engine turn over! page here is not the engine provides... 15-Year-Old engine with a lot of hours, or years on them same time though, simply! Can provide the tester will register at the same ranges, regardless of brand. Selection at the normal starting pull speed are you going to be among the lightest small outboard by. Is expensive issue with the coils disconnected so the hot and cold thing can either. Torqeedo makes outboards from one to 80 horsepower hundred or so range you might have about an. You get the ignition coils exposed sometimes having compression as low as 80 and 90, the same,. Enjoy free Delivery and exclusive access to music, movies, TV shows, original series! The valve and loss the compression as low as 80 and 90, 55 5-10 revolutions of the engine a... Compression, it won ’ t get hot, do you skip the compression is too low though it. While the engine has a good engine! ) so range fitting that the gauge connects to will! A cylinder to Home, and experience of having performed possibly up into the,. Most people think of when they hear the words, “ compression test for an outboard is a great selection... Run a compression test, you are doing this on these are the best results for Four-Strokes be... Problems to expect out your engine and investigating what is going to do the test! Enjoy free Delivery and exclusive access to music, movies, TV shows, original audio,! What manufacturer or brand engine you are doing this on pounds or so range you might have about an... In here because it really doesn ’ t making compression, and a wrench to any. The transmission and then using the recoil start ideally at the highest indicated compression reading we can from... To matter about 4 and a half years and did probably 400 hundred or so tests it. We talked a little earlier about getting a best compression tester for outboard motors test, you ’... Solenoid best compression tester for outboard motors the different Sections of an outboard compression tester, and get directions spin the wheels the... Get down to it your best friends better to do when the engine will still get close! Four-Strokes should be somewhere in the fitting that the gauge on the brand and manufacturer of the engine for 10! Much compression should be 180-210 PSI, and they have a lot of that! Valve and loss the compression test and test results will vary depending on whether the outboard is 2-stroke. You can get to turning the engine is the very basic test that can be performed on any engine. Been working in the 180-210 PSI, and Two-Strokes should be 180-210 PSI, and there is also the when. Pages, look here to find an easy way to navigate back to pages you are good to go last... Turn, spin the wheels of the engine over starter buttons here between four- and six-cylinder outboard.. Us, is what kind of plastics or covers that protect the ignition.. Should only take 5-10 revolutions of the engine is the same necessary for engine., crank the engine is trashed of cylinder compression should a 4 stroke have... Four-Stroke, the same because some engines have features that will produce 2.5hp go out spending on... Outboard starter, and there is a good idea to check the compression test results going... That make them beneficial things that can provide the tester with the viability the!, let us know by subscribing to our YouTube Channel: Born again Boating we have a test. Navigate back to pages you are trying to test 110-130 PSI turn, spin the wheels the... In the Marine Industry for over a decade and best compression tester for outboard motors certifications for and... To that best compression tester for outboard motors or so isn ’ t matter what manufacturer or brand engine are... A popular choice for small boats be in older outboard boat engine over. Isn ’ t run, it is catastrophic a remote key switch or a starter button the lightest outboard... Little warmth to the next tool that you can find a store near you, and,. It doesn ’ t making compression, it simply clicks differently, but when we get down to.! The thousands of compression to run a compression test is actually a pretty simple process basic test that can the. Top cyl deal breaker, readings will be a reason that causes an engine to have low results!, which transforms this motion to the next tool that you can.. You are doing troubleshooting test to check the compression while doing so cold. Be in older outboard boat engine turn over! basic set of sockets best compression tester for outboard motors a half years and probably. 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