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1996 Mercury 115 Wont Idle ???

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through June 29, 2009 » 1996 Mercury 115 Wont Idle ??? « Previous Next »

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Pert
New member
Username: chevy406

Post Number: 1
Registered: 06-2009
Posted on Wednesday, June 17, 2009 - 10:28 pm:   Edit Post Delete Post View Post/Check IP

The engine overheated due to weed obstruction in the water intake and it shut off. Cleared the weeds and tried to start it, but it wont idle. The engine starts and runs fine with a little throttle, at about 1000 RPM. Any suggestions ???
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Fastjeff
Senior Member
Username: fastjeff

Post Number: 6040
Registered: 09-2003


Posted on Thursday, June 18, 2009 - 06:46 am:   Edit Post Delete Post View Post/Check IP

May have burnt a crank seal.

Jeff
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Pert
New member
Username: chevy406

Post Number: 2
Registered: 06-2009
Posted on Sunday, June 21, 2009 - 07:34 pm:   Edit Post Delete Post View Post/Check IP

UPDATE:

I havent had a chance to do a compression test but i did check for spark and all four cylinders have spark, however the two lower cylinders dont seem to be firing. After firing I removed the spark plugs and the two lower one were wet with fuel.
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jamie campbell
Advanced Member
Username: outboard_doctor

Post Number: 425
Registered: 02-2009
Posted on Sunday, June 21, 2009 - 09:19 pm:   Edit Post Delete Post View Post/Check IP

Pert your engine runs on the top 2 cylinders at idle and the lower 2 dont come in till later in the rev range. do a comp test and let us know the readings
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Pert
New member
Username: chevy406

Post Number: 3
Registered: 06-2009
Posted on Saturday, June 27, 2009 - 01:16 pm:   Edit Post Delete Post View Post/Check IP

Compression Test Completed:

Cylinder # 1 - 130
Cylinder # 2 - 115
Cylinder # 3 - 125
Cylinder # 4 - 125
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'Bandit
Advanced Member
Username: timebandit

Post Number: 763
Registered: 09-2007
Posted on Sunday, June 28, 2009 - 09:08 pm:   Edit Post Delete Post View Post/Check IP

That 115 in the #2 hole worries me. If this engine blows that's where it will happen. Probably a 1/3 of the piston is gone on the ehxaust side. Or the liner twisted.

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