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svandamme svandamme is offline
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Join Date: Sep 2003
Location: In Flanders Fields where the poppies blow
Posts: 18,369
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valve stem seals / valve spring preload

Howdie folks, best wishes for 2005


started reassembling my engine last week , thought i'de start with the valve heads, seemed straightforward...

but turned out less straight forward

them white teflon valve stem seals , are a PITA

please correct me if i'm wrong, but they are supposed to go completely over the valve guide , right?

if so , how do you guys do it? that sucker is so tight, the only way i can get it over the valve guide, is with serious brute force

and then the seal looks just like that : seriously brutalized, what am i doing wrong here? is there a trick to get them on?



also , the valve spring preload, is this a very critical thing ? i mean
yes i can measure the valve compressed height
book says 35.5 mm for the intake , 34.5mm for the exhaust
.03 mm tolerance
but the way to measure this is very inaccurate

- measure the depth of the dish
- install the spring
- measure the height of the spring on top of the dish where the springs sit in (add depth of the dish)

then add washers as required

the problem is the inaccuracy of my measuring , 2 measurements, neither are very precise ( anything in between a mm is guess work )

to me it feels like that 0.3 mm tolerance, is not going to be achieved this way

any ideas?
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Stijn Vandamme
EX911STARGA73EX92477EX94484EX944S88NOW987C2007
Old 01-03-2005, 12:48 AM
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