Compression Problems with 175 Johnson

T

thibben

Recruit
Joined
Oct 28, 2003
Messages
3
I have 0 compression in the bottom right cyclinder. 90pounds of pressure in the middle right and 30 in the top right. I put oil in there and it did not come up in the top and bottom one. What could Cause this?
 
H

Hooty

Rear Admiral
Joined
Oct 2, 2001
Messages
4,496
Re: Compression Problems with 175 Johnson

Zero compression don't zound good. If the engine's running, you might try doing a decarbon treatment,other then that you're gonna have to remove the head and see where all your compression went.<br /><br />c/6<br />Hooty
 
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Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: Compression Problems with 175 Johnson

It COULD be broken rings. Not uncommon on a crossflow (you didnt mention what year 175 you have so it may not even be a crossflow) on the starboard side. Pull the heads and let us know what you find.<br /><br />Also a model number would help.<br /><br />Good luck!
 
A

AUGIDAWG

Petty Officer 2nd Class
Joined
Oct 31, 2002
Messages
189
Re: Compression Problems with 175 Johnson

0 compression says to me you have a hole in the top of your piston.<br />Even if you had no rings, you would get some kind of compression, in my opinion.<br /><br />Or, your connecting rod is broken. (don't even think that)
 
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