Need some help please. Mercruiser 3.0L problem

macr6

Petty Officer 2nd Class
Joined
Jul 11, 2007
Messages
153
Hey guys,

First, I have a 98 3.0L Mercruiser 4cyl.

I have a (what I think) is some sort of compression leak or busted gasket. You can hear and feel air coming out from under the manifold close to the block near the rear of the manifold. I thought I had a manifold leak and changed out the gasket. Fired her up and heard and felt the same thing. Now I'm guessing that the head gasket (not sure if that's what it is) is leaking.

My questions are; what is it I should be looking for? Is there some sort of test I can do to find out where the leak is coming from? Is getting to that gasket a hard thing...meaning will I need any special tools. I have a Seloc manual but not to many helpful pictures.

Any help would be greatly appreciated.
 

macr6

Petty Officer 2nd Class
Joined
Jul 11, 2007
Messages
153
Re: Need some help please. Mercruiser 3.0L problem

CAn anyone help a DIY'er out?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,130
Re: Need some help please. Mercruiser 3.0L problem

A Compression,+ Leakdown Test will pretty much tell you What's going on.............
 
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