sealing compound necessary on new gakets?

[merc20076]

I have receive the head gasket to put on the second 7.5HP that I'm working on. I also got my OMC factory service book 2-8HP printed in '86.

They say to torque the bolts between 144-168 in. lbs for the powerheads between 5 and 8 HP. My motor is a '83. Also they mention that I need a gasket sealer. Is it necessary with today's new gaskets?

 

[HighTrim]

Re: sealing compound necessary on new gakets?

Most newer gaskets do not require sealer if they have the shiny glaze to them. Does yours have this?

 

[merc20076]

Re: sealing compound necessary on new gakets?

Not really, just on the edges.

 

[boobie]

Re: sealing compound necessary on new gakets?

Normally if the gasket doesn't require any sealer it will say "use no sealer". If it doesn't, I would put gasket sealing compound on it. Don't use any sealer on intake manifold gaskets, carb gaskets and ect.

 

[jasper60103]

Re: sealing compound necessary on new gakets?

This another one of those highly debated questions. Trust me, before I replaced my head gasket last summer I searched the old threads for a definitive answer. I bought an OEM gasket and it didn't indicate whether it needed sealer or not. Anyway, I skipped the sealer, torqued it to specs and so far no leaks. Take it for what it's worth. Good luck.

 

[Cofe]

Re: sealing compound necessary on new gakets?

Remember to re-torque the head after you have ran the motor up to operational temperature.

 

[merc20076]

Re: sealing compound necessary on new gakets?

RESULTS:

90 PSI MAX on both cylinder, I torqued them to the minimum torque my book says.

Before installing the gasket, I put in 2 stroke oil in the cylinders. And no, I didn't use sealer.

Not having the carb on and the starter I cranked the motor with a drill with the ? flywheel nut.

I wonder if it's good and worth to continue working on it? Is the gasket still good if I wan't to put it on my other 7.5 which runs good?

 

[ONERCBOATER]

Re: sealing compound necessary on new gakets?

90# seems a lil low to me but it should fire and run that way.
suggest using the pull start and letting us know what the compression that way is, i believe you want carb wide open and both plugs out for the compression test.
Sean