2005 50 hp mercury compression test|Performing Compression Tests : maker I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. During a cold engine compression test, the cylinders both hit exactly the same at .
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The Hull Truth
Having some trouble with my motor do I decided to do a compression test. I have a 2005 merc 50 HP 2 cycle and mine are between 114 and 118 which I thought were low but I have a good friend in another state that is a mercury repairman and he . When doing a compression check, it's best to do it with the engine warm. Typically, I crack the spark plugs loose, re-tighten and run the engine for a few seconds to get .
Here's how to do a compression test on your Mercury outboard 2-stroke engine. Or download a repair manual instantly here. I was just wondering what was the compression of these engines when they came from the factory. I just bought a boat with this engine and when doing the compression .
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I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. During a cold engine compression test, the cylinders both hit exactly the same at .A compression check can indicate that the piston rings are working properly and that the cylinders are in good condition. The test measures how much pressure is built up by the motion of the piston inside the cylinder, given in pounds per .
A differential pressure test (aka leakdown) is more expensive and time consuming than a conventional compression test. It will show where any pressure leakage may occur, but why . When performing compression tests, it's imperitive that the tests be done with: -A fully charged and PROPERLY RATED cranking battery. -Engine warmed up to Operating Temperature. My compression check shows 80 lbs on 5 cylinders and on number 6 it reads 105. Mercury VesselView shows 820 hrs. Which such variables and hours, I think the .
Mercury 90HP 2 Stroke cold start, idle, forward and reverse gear engagement, compression test. Dec 20, 2005 Messages 14,648. Jul 28, 2016 . Do you stick it in the oven to warm it up I know I don't have 45 yrs in the trade. I know that I can go do a compression test on my 25 hp mercury hot or cold and it will be 120+ each time. Good for you if you can charge for 2 tests. One question How can the rings get tighter as they get warmer if . After owning for two weeks, I decided to do preventative maintenance (spark plugs, wires, oil, fuel and air filters, etc.) also decided to do my own compression check and purchased a Mercury VesselView. My compression check shows 80 lbs on 5 cylinders and on number 6 it reads 105. Mercury VesselView shows 820 hrs. Part 1 in the Mercury 60hp outboard tuneup series
I am looking at buying a merc outboard - 1997 250 hp EFI with an hour meter showing 178 hours. Compression check shows 100,105,100,110,105,100. What should this motor have for compression with these low hours, or am I being scammed and the motor really has 500 or more hours??? Thanks
Re: 2006 mercury 15hp compression question The compression test should be done with both plugs out of the motor and the plug wires grounded out to the block. The prop removed and the throttle in the FWD wide open position so the cylinder's get plenty of air to compress. The pull rope should be very easy to pull when done this way. 2006 Mercury 50hp 2 stroke compression. Thread starter dhearn0513; Start date Dec 20, 2014; D. dhearn0513 Contributing Member. . I just bought a boat with this engine and when doing the compression test all three cylinder measure 110 psi. I know that this is good numbers but just wondering what is was from factory. Reply. Hi All, I did a compression test on a recently purchased 25 HP 1987 Mercury. It doesn't run so I had to do the test cold. My results were 120 psi on the. Go. Home. Boat . (maybe 1 in 50 or 100 carbs would suck in crud and chip a reed), it restricted air flow, caused a little richer running (burned more gas, fouled plugs quicker, carboned up . what should compression be on 50 hp 4 stroke mercury? 155 lbs on all cylinders. is that low? Dealer replied should be over 200 per cylinder. Thanks . Reply. G. galamb Silver Medal Contributor. Oct 5, 2016 #2 May depend somewhat on the year. My service manual for 2002-on says 180-210 psi.
The first thing that most people think of when they hear the words, "compression test," is expensive. Is that really the case though? What Outboard Compression Test Results Mean. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around Hi All, I'm looking at possibly buying a 1991 Mercury 90HP (oil injected) long shaft with power tilt. The seller claims that a compression test has shown 120 PSI on all three cylinders and that no major work has ever been done on the motor since it was new, only seasonal fogging, annual gear case oil changes, new impellers, plugs etc. I am buying a used boat with a 2006 Mercury 90 HP 4 stroke EFI, and will have a compression test done. I believe, for reading here, that nominal. Shop . Main Menu. SHOP LOGIN; CREATE AN ACCOUNT . Nov 28, 2005 Messages 512. May 26, 2015
Sold as parts or repair, with a 1998 mercury 90 2 stroke (same engine) It was deemed as this by the owner after his mechanic told him all compression had gone. I bought it for half the worth of the trailer and parts of the engine, so worth a gamble. The compression on each of the 3 cylinders were from memory 75, 90 and 90.2002 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.
Performing Compression Tests
How to Compression Test on Mercury 2
Dec 20, 2005 Messages 14,648. Dec 4, 2011 #2 Re: compression for 225 HP optimax mercury 2001 I know nothing about your engine but similarities surely exist: The serv man for my 90 hp triple, looper, says cylinders should be within 10% primarily. It goes on to say that generally speaking readings below 120 could be cause for concern.
Ran a cold compression test and came back 100 psi on cylinder 1 and 92 psi on cylinder 2. Question is, are these compression readings tolerable? . 2005 Messages 51,019. Nov 1, 2006 . Jun 30, 2006 Messages 28. Nov 1, 2006 #5 Re: Mercury 20 HP Compression Compressions should be higher than that. aprox 120-140. Unfortunatly if the bore is . 1987 Mercury 90 hp 2 cycles 3 cylinder outboard (Serial No: 0B194831 Model No: 1090727) compression test - I got 100 psi, 100psi and 75 psi, so motor turn.After the compression test is completed – or skipped – you can now proceed with your Mercury 2-stroke spark plugs and compression service by installing your new spark plugs. For ease of future removal and to reduce the risk of thread damage to the cylinder head, apply a tiny amount of anti-seize compound to the threads of the plug. Re: Mercury 40 HP 4 Cylinder 2-Stroke Compression Question That's good numbers. #3 is a bit low, go to a Yamaha powersports dealer and get a jug of Ring-Free+, put a couple of ounces or so in a spray bottle, remove the plugs, and spray liberally in each bore. Crank the engine for a couple of seconds, wait overnight, and test again.
Jan 19, 2005 Messages 501. Jul 25, 2005 #2 Re: 4.5 HP Mercury won't start. . 4.5 HP Mercury won't start. compression test that sucker. you need more then spark fuel and air for usable combustion in an engine. you have to squash it all together. you are looking for 100+psi, might get away with slightly less.if you have good compression .The most obvious and best way of testing for a bad head gasket to actually know if the head gasket is blown. Is going to be to perform a compression test and a leak down test on the engine. (You can learn all about how to perform and what the results mean of a compression test here: Everything You Need To Know About Outboard Compression Tests!)
He thought maybe if the battery was almost dead that could contribute. He will be running another test but I am wondering if there is anything he could be doing wrong that is causing the low compression. If he thought maybe a low battery could cause an inaccurate compression reading, but he wasn’t really sure. Yeah, find a different mechanic. Please Note. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. You are invited to join our public Boat Repair Forum to seek assistance from other members. You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
Re: 2002 Mercury 150Hp xr6 Compression and overall reliability of outboard From Mercury Service manual COMPRESSION All Models – Using a fully charged battery, throttle shutters wide open and cylinder block warm 110 – 135 psi (753.3 – 924.5 kPa) Variance between cylinders should not exceed 15 psi (102.7 kPa)After the compression test is completed – or skipped – you can now proceed with your Mercury 2-stroke spark plugs and compression service by installing your new spark plugs. For ease of future removal and to reduce the risk of thread damage to the cylinder head, apply a tiny amount of anti-seize compound to the threads of the plug.
on two stroke a compression test is quick easy and painless. on a 4 stroke it is a teat on a boar hog. I cannot tell you how many 4 strokes have passed a compression test with leaking heads,leaking valves and stuck rings due to carbon. yet the compression was good and the leakage rate above 70%. **PLEASE SUSBSCRIBE** Every little bit helps for a small kickback!Compression test on a 2005 Mercury 200 XL Carb SW Outboard. Engine was warmed up and test d.
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2005 50 hp mercury compression test|Performing Compression Tests