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coscast head valve steam seals?

4K views 36 replies 14 participants last post by  Matt2345 
#1 ·
Any one help need to were a can get valve steam seals for the costcast head ?
 
#7 ·
Two different sized guides, so two different sized stem seals - a 13mm which, IIRC, is the early one and the 11mm which is the later and german spec guide.
if the stem seal is too big to sit on the guide, get the later type and if the other way round, get the early 13mm seal. Valves are the same, 7mm, diameter.
 
#14 ·
If you're still stuck, give SBD a call (or QED, etc), I've found them good to deal with and they have both sizes.
Tel: 0208 391 0121
may be a bit more than other sources, but if they save the hassle, well worth it, IMO.
 
#15 ·
someone ****ed something up as stem seals are the same whether coscast or gm, the early coscasts are 13mm od where it fits into the casting, then machined for 11mm where the valve stem sits. so a set of 20xe stem seals will fit either guide. there is no way vauxhall would make oddballs stem seals, spring platforms for early coscast heads as it would cost too much to do.
 
#24 ·
Not lookin to get in the middle of if there is 2 sizes. but I built a coscast head last year had dubble springs in it had to take the head back off cause the springs rubbed off the seals and the little springs came off some of them. (I got a full seal kit off auto vaux ) brought the head back to where I got it skimmed and tested cause they put it back together and after a day or so they said it was the wrong size seal I gave them. But they should have looked so they put new seals in no charge... Don't no if this was a cop out for them over bad work but hope this helps over the two sizes and some parts guys don't no much to much except pushing
 
#26 ·
Bumping an old thread,

I've got a coscast head bought some years ago to use and the stem seals for it are 2 different sizes on the inlet and the exhaust side of the head,

the standard GM ones fit the exhaust side, but they are too big for the inlet side, reading above I'm sure there ARE 2 sizes,

The valves have the same size stem and will fit though just the same,
but where the stem seal fits to the bronze guide is much smaller on the inlet and the gm ones are just too big,

Just a bit confused as to which size to get,
or if someone has changed the guides in this particular head.

What do you all think??
 
#28 ·
There are only one set on stem seals made to fit both 20xe and c20xe. The valve guide maybe 13mm on the coscast but it is machined down where the guide fits on. So both 20xe and c20xe have the same 11mm diameter on top where the stem seal fits the guide. The genuine vauxhall part number is 90215296.
 
#31 ·
I rebuilt my COSCAST head about 10 years ago and just bought a £50 head gasket kit, so both the inlet and exhaust valve stem seals where the same.
For the record I'm in the process in replacing the valve stem seals because the cheap pattern part items have gone too hard, the rubber does not flex and is leaking oil.
I've bought a set of Victor Reinz off eBay for about £12.
 
#33 · (Edited)

27. VALVES, INLET AND EXHAUST
17 90322697 642858 VALVE,EXHAUST,STD. (LESS IDENT) 8
17 90322698 642859 VALVE,EXHAUST,0.075 MM O/S (IDENT K1) (NLS.- NO REPLACEMENT PART) 8
17 90322699 642872 VALVE,EXHAUST,0.15 MM O/S (IDENT K2) (NLS.- NO REPLACEMENT PART) 8
18 90322694 642758 VALVE,INLET,STD. (LESS IDENT) 8
18 90322695 642726 VALVE,INLET,0.075 MM O/S (IDENT K1) (NLS.- NO REPLACEMENT PART) 8
18 90322696 642727 VALVE,INLET,0.15 MM O/S (IDENT K2) 8
19 90322032 642242 SPRING,VALVE 16
20 90322031 642302 CUP,SPRING 16
21 90097110 642367 KEY,VALVE STEM 32
22 90281144 642963 WASHER,VALVE (NLS.- NO REPLACEMENT PART) 0
22 90285797 642964 WASHER,VALVE (NLS.- NO REPLACEMENT PART) 0
23 90215296 642527 SEAL,VALVE STEM

Part 23, one part number listed for all ranges of astra,cav,calibra with 20xe and c20xe with standard guides.

Then sbd do a smaller valve stem seal for there bronze valve guides.
http://www.sbdev.co.uk/Camshafts/2L_Valve_Train_Components/2L_Valve_Train_Components.htm
 
#37 ·
Thanks for the info, particularly GSI16V and Darren, great info looks like my head has had the SBD special guides then, I agree with what has been said, I guess there are a few heads floating around like this that have had the guides changed to non standard ones IE SBD

Would there be any reason to have the SBD quides on just the inlet side when using double valve springs? or is my head just a bit of a mish mash, Thanks to you all.

Matt
 
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