Merc 2.4 head gaskets

**markp80m** · 09-22-2018, 09:10 AM

I have a '79 Merc 200 HP 2.4. Runs great. Took a compression check. Right bank 120. Left bank 130. Ah, different head gaskets, I can see visually. Measured .040 vs .050 (1.0 vs 1.2 mm) Researching through the forums, I can't find a part number for the 1.0t 2.4. So, will a thin head gasket for a 2.5 work on a 2.4? Or, is there a part number I haven't found yet?
I have not removed the heads yet, so not sure on the block details. Sleeve bolts, vs the block bolts, etc. And being 39 years old, 3 owners, anything could have been done to it by now. Just want to match the thin gasket that's on there now.

**ChrisCarsonMarine** · 09-22-2018, 09:31 AM

My advice is leave the heads on.A .010 difference in gasket thickness would not render a 10 pound compression increase, one or two...possibly.More likely the head was cut in the past.The motor won't mind the difference,and the gaskets,(inside bolt pattern)are scarce and expensive.You may also encounter a bunch of breaking or stripping head bolts,especially if its seen salt water.If you insist,I have the gaskets,but I would leave the sleeping dog alone,Chris

**markp80m** · 09-22-2018, 10:07 AM

That was my alternative thoughts. Something happen in the past, and a stock head and gasket were used to replace. So heads may be different. I'm still in the 10% range, so not broke, don't fix! And head gaskets are expensive, when just taking a look. Was just interesting that each side was a constant number.