Ford 9N, 2N & 8N Discussion Board|
Re: Valve guide seals
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Posted by Dell (WA) on June 03, 2004 at 10:45:31 from (188.8.131.52):
In Reply to: Valve guide seals posted by Ronin on June 03, 2004 at 09:16:58:
Ronin.........unlike my estemed contributor "Gaspump", I have a slightly different take on yer flathead valve stem seals question.
Remember early engines didn't have seals because available seal material wouldn't handle the temperatures but that the modern seal is retro-fittable all N-Engines.
1st) my N-Ford Master Parts Catalog (MPC) lists p/n 8BA-6571, seal, intake valve (4)
2nd) only intake valve stem seals are needed to prevent "vacuum leaks" into the engine upsetting smooth running and also sucking valvestem oil so you don't fogg all the 'skeeter's.
3rd) the HOT EXHAUST stem will cook yer plastic/rubber seal making it hard and non-sealing, leave alone the exhaust pressure is blowing any valvestem oil OUT.
4th) the reason your overhaul kit comes with 8 valve stems is because it's eazier for the kit mfr to include 4 un-necessary valvestem seals than to answer complaints about NOT HAVING a seal for every valvestem.
But you can use exhaust seals iff'n it makes you feel better.
Remember, OverHead Valve (OHV) engines like the "RedTiger" intake and exhaust stems are bathed in oil and will have mandatory coil spring re-enforced valvestem seals.
I've used "assembly lube" from parts store. I've used "lubraplate for brakes". I've used chassis greese 'cuz it don't drain outta the bearing gaps like engine oil. I don't use engine oil.
I don't use any gasket sealer except chassis greese, which I use to keep the gasket inplace while I get the bolts installed.
I don't use headgasket paint to seal the headgasket 'cuz it makes the head so hard to remove and they didn't use paint at the factory eather. I've NEVER had a "dry" headgasket leak.........respectfully, Dell
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