1995 mercury compression test

[eula30]

Hi there, I just received 1995 Mercury 150hp 2.0 Liter, I did a compression test. From left side first and top to bottom:<br /><br />1) 115<br />2) 116<br />3) 0<br />4) 116<br />5) 115<br />6) 115<br /><br />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 don’t even move, I found it very strange on why there is no compression at all.<br /><br />Any help or advice on this motor I will really appreciate.<br />Thank you

 

[eula30]

Re: 1995 mercury compression test

any ideas?????

 

[eula30]

Re: 1995 mercury compression test

Is that means the piston is blown? I will really appreciate any help of you part.<br />Thank you

 

[Bob H.]

Re: 1995 mercury compression test

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]

Re: 1995 mercury compression test

Yep time to tear her down...<br />just went(going) through the same thing Here is a place to start <br />Jon

 

[cbtagg]

Re: 1995 mercury compression test

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]

Re: 1995 mercury compression test

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