outboard compression test hot or cold|How To Accurately do an Outboard Compression Test : purchasers How To Correctly Compression Test an Outboard Engine. Performing a compression test on an outboard engine is fairly simple. However, I’ve seen a lot of misinformation on this topic. The most common being to just pull out the . WEBBefore you go into real-money action, use the Lucky Jet Demo to sharpen your abilities .
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Testing warm will give a truer reading than testing cold as all the parts will be at their operating clearances. Testing cold works to as all you are trying to do is get an indication .
Sea-Horse is correct! A compression test is only a "reference" as to what compression is. It does not mean you don't have bad rings/cylinders, etc. Really, the key is .A compression check can tell a lot about the health of your outboard engine. Here's why and how it's done. There are four distinct phases in a four-stroke cycle: induction, compression, .
How To Correctly Compression Test an Outboard Engine. Performing a compression test on an outboard engine is fairly simple. However, I’ve seen a lot of misinformation on this topic. The most common being to just pull out the .
Hi, Curious of the pros/cons of hot versus cold compression tests. For example, on the MB TM, the compression for diesel engines should be done with engine temperature no less than 70C. However, Ive heard that a cold compression test can be more telling in some ways than hot. Also, for. The difference between the compression at cranking speed and the compression at idle should be equal for all of the cylinders. If the engine miss complaint is with a cold engine, do this test cold. For a warm engine, do the test warm. Hopefully this simple test will save you some diagnostic time when searching for the dreaded engine miss. Engine compression test Hot or Cold. Thread starter scott_duerring; Start date Sep 8, 2009; S. scott_duerring Regular Contributor. Sep 8, 2009 . guess it is always easy to "armchair" things, one of the mounts had very easy access but the outboard side would've been the bugger to work on. Dave, whatdaya want for them?" Reply. diver_dave . Re: Compression testing, hot or cold? Get to the bottom line. Compression doesnt change 30 psi from hot to cold. That is wrong. To say a cold engine compression test is worthless is wrong. People are looking for help not theorys out of books. If you havent done it in the real world sit back and see how people do this every day for a living.
So the ratio between 20C air and 50C air in hot manifold is 1.3 to 1.15 or about 0.88. The ratio between the hot and cold compression readings was 0.94. So air density not mechanical influences can expalin the hot vs cold compression readings. That's science! And like all science always up for debate... Peter ** Gas Law. P.V=m.R.T 2002 Mercury Outboard 150 hp Salt water series 2 stroke engine. Pressure test was performed with hot and cold engine using two different tester kits. One fr.
Everybody hears about performing an outboard motor compression test, and everyone knows that when you buy a used boat, you should compression test the outboa.
Topic: compression test hot or cold – Antique Outboard Motor
How To Test Compression Drop in Hot
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Engine CompressionAtmospheric pressure at sea level is approximately 14.7 psi.A 9:1 compression ratio cylinder is compressing the air and fuel mixture to about 132 psi at sea level (9x14.7=132.3 .A compression test is simple to learn and only requires a few basic tools. From a mechanical perspective, you will need to know how to properly remove the spark plugs on the vehicle or equipment you are testing and properly disable the ignition system and fuel system, the latter if the vehicle is fuel injected. For carbureted engines, you can choose to disable the fuel supply . Big Jon Honda 5hp Outboard Shop Outboards. Back Boat Seats. View All; Fishing Boat Seats . Compression test, hot or cold? Thread starter Simoniz; Start date Oct 4, 2018; Simoniz Petty Officer 1st Class. Joined Dec 30, 2007 Messages 242.
Compression Test Hot or Cold. Thread starter Chippster1; Start date Mar 18, 2022; C. Chippster1 Active Member. Mar 18, 2022 #1 I hear all different opinions on whether compression tests are more meaningful hot or cold Would love to open a discussion Ted Chipps RV10 498EC . BH1166 Well Known Member. I take compression testing with a grain of salt. It’s really just a rough sketch of an engines condition. If you really want to know what’s happening, a leak down test is the way to go. For me a compression test is a quick way to verify an engines integrity when faced with a performance problem or no start issue. Re: Hard starting mercury outboard hot or cold I agree with JB your compression sounds low. The butterfly should be shut when your not giving it gas. You may want to check the level of fuel in your carbs float bowls. If you pour fuel in and it runs until that gas is gone it sounds like it is starving for fuel.
Step-by-Step Compression Test Procedure. Follow this process to test compression on your outboard boat motor: 1. Warm Up the Motor. Running the motor warms it up to normal operating temperature. This allows the engine parts to expand to operating size. Testing compression cold can give inaccurate low readings. Always test warmed up. However, it can come in handy especially at the time of purchasing an outboard. Be sure to perform this test only when the outboard is at cold temperatures and free of oil and other additives. 2. Pressure Gauge Method This is perhaps a better reliable and repeatable method of testing compression in outboard motors.
take the reeds out,retest the compression. you will find it did not change. however with the reeds out you wont move fuel. the intake and ex ports will supply enough air at cranking speed to test ring sealing ability. over the years playing with the two smokes I have found it really does not matter hot or cold or throttle open or closed.
Re: Compression hot? cold? 30hp Johnson on a two stroke hot or cold really does not matter, what your looking for is the spread of the numbers not the numbers if the numbers are bogus cold they dont get any less bogus warm.oil in the cyl for testing compression is a waste of time usually done by car mechanics that have no experience or understanding of . Learn More About Your Boats Systems By Joining The Born Again Boating Academy! https://www.bornagainboating.com/Get Your Born Again Boating Clothing! https:/. If the former is the purpose – test cold. If the latter – test hot. User mini profile. Presto. Posts: 278; Joined: Mon Jul 09, 2012 7:22 am; Status: Off-line; . - Mon Aug 10, 2020 4:49 pm #92037. I would have thought that squirting oil down the bore is a separate issue to whether compression is tested hot or cold. If compression is found .
Compression Test on a Mercury Salt Water series 2 stroke on a 2002 Pro-Line Re: Compression check cold vs hot. That middle cylinder is just a little out of spec (+/- 10%) as measured, tiller, but I do not trust cold measurements if a warm measurement is possible. Could just be some coking that would go away with a good decarb. If she runs, do a decarb treatment, then run the test again as described in the Top Secret . Knowing the compression of an outboard motor can provide critical insights into the health of the engine, and if any major repairs are in the outboard motor's future. . With age and use, the engine’s internal parts can wear and over time their compression abilities degrade. The compression test is a great way to find out if a cylinder is . How To Compression Test an Outboard Motor {TIGHTEN UP TUESDAY}Welcome back to Tighten Up Tuesday! This is a straight up step by step instruction video of ho.
8. If your readings are below standard (not within factory specifications), perform a wet test. A wet compression test will temporarily seal the piston rings and possibly raise the compression. 9. Obtain a can of fogging oil and spray the perimeter of the cylinder walls and pistons. After the oil has been applied, retest that cylinder. A.
men,scott from scotts marine here.have pwc's and outboards that throw good compression hot and cold all day long and all the cyclinders are wiped out.if you have a motor that has good compression and won't run right and every thing else checks out invest in a head gasket and have a look.hopefuly a leak down test is the best way to be sure. Gauges can indicate differently and the test procedure used can vary. Battery should be fully charged, motor hot from recently being run, throttle wide open, all plugs removed and the motor cranked until the pressure stops rising. Different mechanics don't always do the test in the same manner. You might want a third test for a tie breaker.
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How To Accurately do an Outboard Compression Test
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outboard compression test hot or cold|How To Accurately do an Outboard Compression Test