Engine case to oil line adapter: do I need thread sealer?

[rennch]

I've just received this plug from Patrick Motorsports (very nice to deal with, btw) and wondered if I should put some sealer on it, or just torque it.

Anyone know the torque specs?




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[Walt Fricke]

Michael - the seal ring is what is supposed to do the sealing. A machinist friend told me the function of Teflon tape or other thread sealants was to lubricate taper threads (pipe threads) so that you could get them in farther/tighter than if unlubricated. But that does not apply to straight machine threads, which rely on stretch/torque to keep them from loosening, and on crush washers to keep fluids in.

There has to be a torque, but I've had no problems with the Armstrong method. Tighten the crap out of it, but not with breaker bars or other torque multiplication methods. Unlike, say, rod bolts, this fitting - like all such fluid fittings - is not subject to cyclical loading, so it isn't going to come loose on its own.

[rennch]

Thanks Walt. I'll crank er down.

[911pcars]

BTW, in those cases where a new crush/sealing ring isn't available, I have applied a thin layer of 574 or equivalent to both sides of the ring/gasket. Seems to work so far. Do not use tape of any kind, only liquid or paste products. Tape products remain solid if it gets into the lube system.

Sherwood

[rennch]

Thanks guys

[eastbay]

I had to use sealer on the threads on a mag case, crush washers failed to seal on the magnesium.

[KTL]

The '84-'88 spec book says that adapter fitting is 120 Nm = 88 lb-ft

it's the "Adapter to crankcase" listing where I noted "Oil Sump Return Line" by hand