Testing Compression In Outboard Motors 1. It will turn the gears in the lower unit, which transforms this motion to the propeller. You might be wondering this question, as I’ve had to answer it many times over the years to newer mechanics and boaters. See More Reviews. Find the factory specs for the motor so you can compare to your readings. It is tearing into the engine and investigating what is going on or just getting the engine running and run it until it explodes! At the same time though, what are you going to do when the engine doesn’t run? 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. Torqeedo Outboard Motors. 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. There isn’t any need to continue holding the button to see just how much more you can get. It happens to be among the lightest small outboard motor weighing only 21 pounds. You will need a compression tester, and a way to turn the engine over. You will get the best readings. (Check this out for more information on The Different Sections of an Outboard Engine!). These testers are really good and surprisingly durable. AZUNO Compression Tester Automotive, Digital Compression Gauge 200 PSI for Petrol Engine Small … If it doesn’t run, it won’t get hot. 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. If you are dealing with an older engine with a lot of hours and it isn’t running. These are good readings. Two-Strokes generally get low compression when the piston rings fail. Add to Cart Add to My List. 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. )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. Cylinder Leak-Down Tester $ 24 97. 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. What Outboard Compression Test Results Mean. You want to take out the bolts that are holding the coils in. 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. 2021 Boat Buyers Guide: Flats/Skiffs. The compression test and test results are going to be the same! & R. 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For this reason, they are a popular choice for small boats. It will prove whether the engine has a good powerhead or not. Will determine what tools you will need. The top is the top and the last 5 pounds or so isn’t going to matter! Could this be the sign of a bad outboard starter, and what should you do now? Request The Next Technician's Tuesday Video Topic. I used that tester for about 4 and a half years and did probably 400 hundred or so tests with it! Compression Tester, Small Engine, 14mm, 18mm Adapters, 0-200 psi Range, 10 psi Increments, Stop Valve, 2 1/2 in. As to... Signs of a Bad Outboard Water Pump & Maintenance Tips. A compression test for an outboard is a simple test that can be performed on any combustion engine. doing a compression test on an outboard motor? If the compression is too low though, it will not run at all. As well as what the results mean for you! Selecting the Best Outboard Motor. The motor is a 1973 2-stroke and the readings with this tester were from top cyl. Will An Outboard Run With Low Compression? Depending on what brand of engine and what kind of engine you are trying to test. By Jim Hendricks. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. Aaron has been working in the Marine Industry for over a decade and holds certifications for Yamaha and Mercury Marine. That it is most definitely better to do the compression test with a little warmth to the engine. What the compression test tells us, is what kind of shape the mechanics of the engine are in. This is where you will need a couple of specific tools. Part Number: 3612. Four-Stroke results should be somewhere in the 180-210 PSI range. Compression testing allows you to accurately measure the level of compression your engine […] Check here for special coupons and promotions. For a compression test, the engine itself provides the pressurization. The first is called a leak down test. Some people will say differently, but when we get down to it. You got the boat packed with your gear and your best friends. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. 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! Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. If it won’t get hot, do you skip the compression test and start testing other components of the engine? Clearance. This rings especially true when you are performing compression tests with purpose. ... 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. and do this for all four spark plugs? Just Click Here! The gauge on the tester will register at the highest indicated compression reading. Yamaha Outboards. Now you can take your compression tester and thread the hose into any cylinder that you want to start with. Will change the results of your compression test. Two-Stroke engines should have a compression reading of around 110-130 PSI. 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! In a car, it will turn the transmission and then, in turn, spin the wheels of the car around. Compression testing is an extremely valuable diagnostic exercise for ensuring the continuing health of your L-series engine, or really any engine. Instead, they have intake and exhaust valves that also need to close, and they have a much higher compression reading. It will prove whether the engine has a good powerhead or not. These are the best results for a sound, and mechanically solid engine. There's a problem loading this menu right now. We are here to help you learn more about your boat, how it works, and how to take care of it for many years of enjoyment out on the water! Having the engine warm and getting oil up into the cylinders sealing the rings and valves better. We hope it has helped you out and cleared up any questions that you might have about performing an outboard compression test. Signs of a Bad Outboard Starter & How to Start the Engine. (We recommend a couple of starter buttons here. In my personal opinion, and experience of having performed possibly up into the thousands of compression tests. So, the price tag really shouldn’t be the deciding factor in which one you decide to use. Remove all of the spark plugs. Now the Four-Strokes have more moving parts. Get Your Own Born Again Boating Apparel! The kit comes with an extension hose, straight and angled fittings and a rubberized gauge protector. 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?