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Join Date: Apr 2007
Location: wisconsin
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Turbo scavenge pump...add pipe dope?

Silly question. I am getting ready to put my motor back in. I bought new compression washers for both sides of the oil scavenger pump. I suspect that this system runs at pretty low psi...

I really don't want a leak here, as it would be impossible to get to once the motor is back in...

Anyone ever add some teflon tape or pipe dope to the outlet side? Seems like any easy way to get extra assurance. Is it worth it? That side vents into the oil tank anyway, so it should be very low pressure...
Old 05-14-2010, 09:57 AM
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I could see carefully applying teflon tape, but pipe dope is crap for any application IMHO. I think there are some automotive sealers that are specifically designed for these kinds of applications, though...I'd research one of those versus using plumbing grade materials.
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Old 05-14-2010, 10:56 AM
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Pipe dope is apparantly "fuel and oil" safe...

I did read some threads arguing against teflon tape as pieces may break off and cause issues....
Old 05-14-2010, 11:04 AM
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Put the lines and fittings together without any teflon tape or gasket sealer. The curved compression fitting surface makes the seal on the outlet side and not the threads so they won't leak unless someone way overtightens them - distorting them or damages them somehow.

Same goes for banjo fittings and their aluminum or copper sealing rings - no sealant, just lube the threads a little bit so they tighten to torque smoothly.

Many a race has been lost by an overtightened light weight aluminum banjo fitting on a motor splitting during a race and becoming an oil leak.

It is a good idea to put a drop of oil on the threads of the fittings so they tighten up easier and smoothly without binding.
Same goes for AC o-ring fittings, just use a drop of the right AC oil on the o-rings and threads of the fittings.

There is no resistance to oil flow back to the oil tank unless your motor is pressurizing it from piston blowby and a clogged vent line so there is pretty much no measurable oil pressure there.
Old 05-14-2010, 11:06 AM
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What J said. No dope, just new washers.
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Old 05-14-2010, 12:19 PM
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