1995 mercury compression test

eula30 · #1 May 9th, 2005, 03:44 PM

Hi there, I just received 1995 Mercury 150hp 2.0 Liter, I did a compression test. From left side first and top to bottom:

1) 115

2) 116

3) 0

4) 116

5) 115

6) 115

piston number 3 there is no compression at all, you see the piston moving back and forward but there is no compression, the gauge on the tester donÂ’t even move, I found it very strange on why there is no compression at all.

Any help or advice on this motor I will really appreciate.

Thank you

eula30 · #2 May 9th, 2005, 05:40 PM

any ideas?????

eula30 · #3 May 10th, 2005, 06:26 AM

Is that means the piston is blown? I will really appreciate any help of you part.

Thank you

Bob H. · #4 May 10th, 2005, 03:59 PM

Time to pull the power head, you need a least a new piston. Probably some other damage in there also...need to figure out how the piston got damaged.

jheron · #5 May 10th, 2005, 06:33 PM

Yep time to tear her down...

just went(going) through the same thing Here is a place to start

Jon

cbtagg · #6 August 6th, 2009, 07:56 PM

leak in head gasket.compressions rings are frozen. no easy fix. that was my problem last year. you can try marvel mistery oil and new head gasket.

henrye718 · #7 August 6th, 2009, 10:28 PM

Spray that cylider with seafoam every day for a 5 days might get lucky and just have stuck rings.