Mercury 115 Compression Test

Desember 05, 2021 Posting Komentar

Any shop should be able to help you with this type of test. Higher than that I would visually inspect the cylinders.

Mercury Outboard Compression Test With Cold Warm Engine Different Results Find Out Youtube

The Optimax engine can give you a false compression reading.

Mercury 115 compression test. Originally developed by Mercury and the Orbital Engine Corp OptiMax uses a belt-driven compressor to deliver pressurized air and fuel to each direct-injector nozzle at the top of each cylinder. The leak down test does a wonderful job of checking all of the elements in the engine. Subtract 23 from 115 and you get 92.

When a compressor fails the engine runs bad or does not run at all. Your question was - I have a mercury 115 optimax. A compression test is a good way to measure the condition of the rings cylinders and valves.

Using Air to Test Engines Combustion Chamber. They are asking 12k for the boat. 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 told me this is fine.

Whenever you buy an out board you always change the impeller check for water in the LU gear oil before you buy after you buy drain and fill with 100 synthetic marine gear lube its tested with 10 water contamination in it and passes use the correct seals on drain and fill put thermostat in a pan of cold water slowly heat it up what temp does stat open. They should be within 10 of each other. Compression timed spark ignition and the proper ratio of fuel to air.

Take it to a mechanic with a leak down gauge and get the testing completed. From the readings posted at 3 revs everything looks good as they are all lest that 10 percent overall diffrence. At cruising speed where normal conversations occur the competitive outboard generates almost 15.

A comparative test between the old Mercury F115 four stroke and the brand new EFI 115 sees the latter improving on the former in every aspect. At idle the Mercury is four decibels quieter than the competition the competitive outboard is 25 louder. So in your case with 115 being the highest take 20 of that which is 23.

Running very sluggish but starting easily. MERCURY 115 HP INLINE 6 CYLINDER COMPRESSION test readings opinions please. You should do a cylinder leak down test rather than a compression test.

If any cylinder is 92 or less than you would want to look into it a little more. Leak down test are only viable options on 4 stroke engines and compression test are no longer even recommend on 4 Stroke Outboards by Yamaha or Mercury. 50-1 two stroke oil in the gas do you have to ground the spark plug wires to the block for a compression test.

Here is everything that you need to know about outboard compression tests. Compression test need to be done with the throtal in the WOT position and the motor should be turned over 3 to 4 times on each cylender. The combination of compression with a leak down test will really indicate the true condition of the pistons cylinders rings valves and the head of the engine.

After the oil has been applied retest that cylinder. Pull all six plugs keeping them in order. The engines need 3 things to run properly.

115-140 hp 882 128 Specs from Merc SM for 20 25HP. I 100 agree on keeping a yearly record. Answer - I would be happy to help you with that.

If the compressor overheats it will send off an alarm and put the motor into Guardian Mode. In many cases debris from the compressor passes through the air lines into the fuel rails. Check all six cylinders for compression at cranking speed.

If you are going to compression test an outboard to decide on a purchase make sure you take that boat out on open water to take it through a trial run. The leak down test is a more positive test that tests the internal parts of the engine. Check the condition of the lower unit oil as well.

Lighter quieter more performing and even better looking. I know that the factory service manual doesnt mention numbers. We compared them in the Sicily sea mounted on two identical Quicksilver Activ 605 Sundeck.

80 psi 115psi 115 psi. Good results for Four-Strokes should be 180-210 PSI and Two-Strokes should be around 110-130 PSI. If a low cylinder is found during the compression test the use of air pressure can help you find out if the engine has a valve or piston problem.

I have been told that Mercury doesnt publish compression numbers. Obtain a can of fogging oil and spray the perimeter of the cylinder walls and pistons. You know They say that the Merc 115 is really a 135 HP motor so going to 150 HP Which is really like 175 HP might be a fairly easy adjustmentjust remember youll be running a true 150 HP not the 175 HP of the 150 HP Optimaxso dont go picking fights with 150 HP Optimax motorsbut since Evinrude 150s are true 150 HP motors and dont put out the 175 horses that the 150 Optimax does you can go ahead and blow the doors off them with your modified 115.

Will this cause the smart alarm to sound and go into idle modewhich it does after about 5 min of running could this be the rings not sealing and will some ring seal additive help. Inspect for pattern as outlined above. So if your engine is running rough or is lacking power consider doing a compression test.

How to do them and what the results mean for you. A compression test is still the best test for a 2-Stroke engine and should be performed. The injector shoots a plume of air and fuel droplets about 10 microns in diameter about 89 times smaller than a human hair into each cylinder.

Also it is important to perform a compression test every time. Each cylinder within 15 and less than 120 psi may indicate worn engine. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke.

With spark plugs still removed rotate the engine until number 1 piston is at TDC on the compression stroke. If the cylinder compression pressure increases the piston rings are sticking. Also make sure that theres a healthy stream of water coming from the engine that would indicate the impeller is in decent shape.

A full compression test of all 4 cylinders as well as it starting ru. Open throttle plates completely. The guy said he has a friend that could come by his house and the compression check for 30.

Out side of the basic displacement to head volume compression static you have to take in consideration the height of ports for dynamic compression. The Mercury 115 FourStroke is quieter than a competitive 115hp four-stroke across the rpm band. The compressor has its own alarm temp sender in the compressor head.

I have a 115 hp mercury optimax 2006 with low compression in one of three cylinders. Looking at getting an 08 Tracker 190 with a Mercury Optimax 90hp motor on it with 300hrs. This is a 1989 Mercury 115hp oil injected outboard motor mounted on a Starcraft 1700ls.

A wet compression test will temporarily seal the piston rings and possibly raise the compression. A compression test will only tell you if there is a problem that already exists not necessarily if there is going to be one in the near future.

How To Compression Test On Mercury 2 Stroke Outboard Engine