Update: Water in Bottom Two--Power Head Off Now - '73 65hp Johson

[F_R]

I am addicted to OMC / BRP Gasket Sealing Compound. Not to say something else won't work. Or even that it will cure the root cause. But copper and aluminum together scares me. Causes electrolysis.

 

[jimmbo]

I am addicted to OMC / BRP Gasket Sealing Compound.

I've heard that the Withdrawl makes kicking Smack and Dummy Dust look easy

 

[little mfg]

Jimmbo, their light green paper. The feel like they may have a coating on them. Made by Moto Gasket. Thanks!

 

[jimmbo]

Did any Instructions come with the Gasket? Do you have a Factory Service Manual? It would say whether a Sealer, and which type would be needed.
Myself, if a Gasket had a coating, I installed them Dry, Plain paper I would uses a Permatex Sealer, usually #2

 

[little mfg]

This is all the Clymer manual says about it. No reference to the exhaust manifold parts:

17. Installation is the reverse of removal.Lubricate drive shaft splines with OMC MolyLube. Coat both sides of a new power head-to-adapter assembly gasket with OMC Gasket Sealing Compound. Rotate power head slightly

 

[F_R]

Here is what the FACTORY service manual says. HOWEVER, in some cases new and improved gaskets come with a factory coating and no sealer should be added.

 

[jimmbo]

OMC / BRP Gasket Sealing Compound... I think Permatex #3, Merc's Perfect Seal, and Edelbrock's Gasgacinch, are the same stuff. At least they all looked and smelled the same. 40 years ago