Narrowing down "Low compression" problem

N

naghani

Recruit
Joined
Oct 19, 2006
Messages
5
Fellow boaters,
I have a low compression cylinder (from 4). It can be any of: Broken Ring, Bad Valve, Carbon residue, Bad gasket, Not smooth cylinder...).
Can anybody help with a link/resource on a step by step process to find the problem? With such process, I can start from easiest step and if it was negative, then move on to the next step. I dont like to start by disassembling power head.

Thanks
nozar
 
D

DHPMARINE

Captain
Joined
Dec 16, 2003
Messages
3,688
Re: Narrowing down

Re: Narrowing down

You seem to be asking alot,but we do like to help.

Can you tell us what engine you have ?

Dissassembly may be the only way.

DHP
 
bjcsc

bjcsc

Lieutenant Commander
Joined
Jun 1, 2006
Messages
1,805
Re: Narrowing down

Re: Narrowing down

Can't you do a leakdown test on an outboard?
 
I

imported_rosco

Seaman
Joined
Oct 12, 2006
Messages
68
Re: Narrowing down

Re: Narrowing down

its simple.

as you stated, it is either bad rings, bent or burnt valve, or a hole in your piston (not probable, but possible)

if it was a blown headgasket, you would surely hear it.

dump about 2 tablespoons of 30 or 40 weight oil into the cylinder and check it again. if the compression goes up, its the rings, if it doesnt, its the valves.

two cycles are eaiser, its the rings,. hehehe
 
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