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Old 11-28-2008, 08:33 PM
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Valve stem seals

Just bought a set of premium stem seals to put on a set of 882's. There was 8 heavy duty umbrella seals and 8 o'ring seals...

I've read on here to put umbrellas on all 16 valves?

Or the umbreallas go on the intake and the o'rings on the exhaust or vice versa... the heads originally had all o'rings.

thanx in advance

-=Fred=-

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Old 11-28-2008, 10:20 PM
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Quote:
Originally Posted by dirtinla
Just bought a set of premium stem seals to put on a set of 882's. There was 8 heavy duty umbrella seals and 8 o'ring seals...

I've read on here to put umbrellas on all 16 valves?

Or the umbreallas go on the intake and the o'rings on the exhaust or vice versa... the heads originally had all o'rings.

thanx in advance

-=Fred=-
Fred, I may have been doing it wrong all these years, but here's my reasoning. The intake guides will be exposed to a vacuum with the piston descending in the bore and are therefore more likely to pull oil from the guide into the cylinder bore than the exhaust guides. The intake valves/guides will also run cooler and therefore need less oil on the valve stem/guide than the exhausts which run hotter. Therefore it seems reasonable to me that you would want to use the more agressive control (umbrellas) on the intakes and the seals on the exhaust to allow a little oil to migrate down the exhaust valve/guide. If I've been doin' it wrong, I'm sure one of the sharper builders will be along to correct me and provide an explanation of why.
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