Sealer for Heads on '96 Johnson 175 Fst Strike

[MaPaHa]

I can't get the OMC sealer locally for the heads that use O-rings on my '96 175 Johnson motor. Is there any difference in RTV silicon and Permatex #3? I've heard not to use silicon on heads but this is to seal the water passages the best I can tell. Ant tips on applying it because I've never had much luck with silicon on metal to metal cases?

 

[Chris1956]

Re: Sealer for Heads on '96 Johnson 175 Fst Strike

Permetex #3 is the aviation gasket sealer, right? That is not suitable for your purpose. Hurricane Sandy took my service manual, but if I remember correctly, you need a bead of silicone around each water passage. Since you need to retorque the heads anyway, and need the sequence and value, why not buy a service manual?

 

[boobie]

Re: Sealer for Heads on '96 Johnson 175 Fst Strike

As Chris said, silicone. You put marine grease on the O-rings. No Permatex # 3.

 

[MaPaHa]

Re: Sealer for Heads on '96 Johnson 175 Fst Strike

Thanks guys, I'm going to put it together tomorrow so I'll get some fresh high temp silicone. Just couldn't find the OMC sealer. I've got a Clymer manual that has the torque specs and sequence that I'll follow. I think I'll bring each piston up to TDC and lightly scrub the carbon deposits off using some sea-foam and a soft brush. Any thoughts or objections?

 

[boobie]

Re: Sealer for Heads on '96 Johnson 175 Fst Strike

Go for it..........