On some applications, the valve stem seals are interchangeable between the intake and exhaust valves and will look exactly the same. On applications which use different seals on the intake and exhaust valves, due to needing higher temperature material on the exhaust side or different design, the seals will be bagged and labeled appropriately.
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An installation tool is included in Fel-Pro valve stem seal (VS) sets. This tool is a thin plastic sleeve which is placed over the tip of each valve stem during installation. It protects the inner lip of the seal from damage by the lock grooves in the valve stem.
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Posts: 48
Nuance...A valve stem seal role is to control the amount of oil that flows between the valve stems and valve guides,
its role is NOT = to prevent oil from passing, but calibrating.
That's how I understand it.
In the 993, I think a lot of buzz biz generated concerning the guides.
There is concrete evidence through P TSB that the small oil filter default, resulted in different cavity pressures and oil seepage with oil fumes through exhaust, in the turbo engine, AND the NA engine....
Whenever there were fumes from exhaust, everybody yells its the guides.
In my personal opinion, the issue with the guides was exaggerated.
What would you tell an owner when his low mile engine is ripped apart in front of you ? the guides are still new ?
The guides that showed weakness on a high mileage 993 engine were mostly the exhaust guides.
and weak exhaust valve guides make the engine fume, but the oil does not enter to the cylinders through the exhaust guides
It is not the guide material, the culprit, in my opinion.
Its the heat.
This is why the turbo and the RS engines have Na exhaust valves.
there is a 0.03 mm oil film between the valve stems and guides, no reason for the guides to wear.
over-heat and less oil, creates a friction between metal to metal (the stems against guides)
but this scenario was not eluded by Porsche, because in my opinion it is not true. At least not more
than in a subaro or a honda.
The response to this by pros is a magnesium ph. guide???????
because if the stem has friction with the phosphorus guide, it won't wear ????
I was at RUF in germany a few years back, and I discussed the guides issue there..
Their opinion is that the guide material was purposely chosen mild, for the engines to last 200k km or more.
but that's just me
Last edited by geolab; 03-01- at
12:51 AM
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