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Valve stem seals
Posted: Thu May 20, 2010 12:55 pm
by pskipper
Hi,
On the Bull Motif website they show the cup seals and state that they are an improved replacement for the o-rings, is this correct or should both be fitted?
Thanks,
Philip
Re: Valve stem seals
Posted: Thu May 20, 2010 1:47 pm
by alex_holden
I fit both, but I only put the cup seals on the inlet valves (the exhausts won't suck oil in anyway).
Re: Valve stem seals
Posted: Thu May 20, 2010 2:23 pm
by popleycrew
Hi, i have just done my valve stem seals with just 'o' rings. If you are getting the cup seals make sure on the valve guide you have a ridge for seals to sit on otherwise in time they will come off.
Re: Valve stem seals
Posted: Thu May 20, 2010 5:24 pm
by MarkyB
I expect they would still help, working like umbrellas over the valve guides.
Re: Valve stem seals
Posted: Thu May 20, 2010 6:38 pm
by alex_holden
They don't seem to come off, even without a lip. The new guides you can buy from the suppliers don't have a lip.
Re: Valve stem seals
Posted: Thu May 20, 2010 6:45 pm
by bmcecosse
If you fit both - you 'may' starve the valve stem of oil to the point it seizes! Just fit the cup seals - to the inlets only.