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Post by danclift on Feb 2, 2018 23:01:47 GMT 1
Valve stem seals have lifted again causing smoke on start up I'm taking the cylinder head of every 3-4K miles and changing the seals getting very fed up now what can I do ? I've tried glueing them down seems like pinto engines don't like to have valve stem seals then ?
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Post by muttleymk2 on Feb 2, 2018 23:08:41 GMT 1
You must be fitting them incorrectly or there is a problem with the boss of the valve guide. I have never had this happen to any Pinto I have owned or built and that is a hell of a lot of Pintos
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Post by dodgerover on Feb 2, 2018 23:12:02 GMT 1
I think you've got wierd aftermarket guides fitted at some point when the head has been reconne, everybody I have spoken to about the CVH seals say they should fit but they don't on yours - I think that's where the problem is.
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Post by danclift on Feb 2, 2018 23:35:03 GMT 1
No looking at pics on eBay and google my head is the same cvh don't fit I heard the head needs machining to fit them there is not much of the guide to hold seals down its all standard head
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Post by dodgerover on Feb 3, 2018 10:01:44 GMT 1
Not according to the guy I know who builds pintos to race.
I've not had my rocker cover off lately but last time I checked valve clearances the new stem seals were all in place after 15000 miles and I only used a cheap top end gasket set - nothing dear.
That would suggest to me there is a problem with your head
Edit will ask another F2 stock car driver if they ever had issues.
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Post by dodgerover on Feb 3, 2018 11:41:58 GMT 1
Right, they didn't use CVH seals in their engines as they weren't bothered about a bit of smoke, HOWEVER they were running hard at 8000rpm and only very occasionally would one come adrift, remember that's with a full on race head with the guides shortened for better flow at the expense of durability.
You bought another new pinto - why not just stuff it in?
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Post by FredTransit on Feb 3, 2018 14:53:05 GMT 1
You must be fitting them incorrectly or there is a problem with the boss of the valve guide. I have never had this happen to any Pinto I have owned or built and that is a hell of a lot of Pintos Didn't you find more than one head had micro cracks after this happened to (one of) Jonnochap's engine?
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Post by muttleymk2 on Feb 4, 2018 0:14:32 GMT 1
No, that was a valve seat problem. The standard seals will stay in situ no problem if they are pushed home properly and the top of the guide is in good shape, I have built race pintos with shortened guides and double springs and still only ever used standard guide seals, never ever had one come off even when they are old and hard like me
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Post by dodgerover on Feb 4, 2018 21:07:54 GMT 1
No, that was a valve seat problem. The standard seals will stay in situ no problem if they are pushed home properly and the top of the guide is in good shape, I have built race pintos with shortened guides and double springs and still only ever used standard guide seals, never ever had one come off even when they are old and hard like me Have you tried the port profiles given in the David Vizard book?
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Post by danclift on Feb 4, 2018 22:33:51 GMT 1
People talk about valve stem seal fitting tools or not fitting them properly but they are not hard to fit just push it on with my finger so why would I need a tool for that ? Had head off fair few times now inspected it all over lapped valves in ect can't see anything wrong with it never got new engine got a refund after months of it never arriving fiixed this engine with a new camshaft kit so would revs have anything to do with it ?? I drive it around 400 miles a week often 70/80mph it's a 4 speed so does rev up a bit but never thought that would make them pop off
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Post by dodgerover on Feb 4, 2018 22:44:59 GMT 1
If they'll hold on at 8000 rpm I would say you are still safe at maybe 4500? I think the tool is only so you don't damage the inner seal onto the valve stem whilst fitting them.
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Post by muttleymk2 on Feb 4, 2018 22:59:27 GMT 1
They should be tapped home with a soft tool, just pushing them on is not fitting them properly.
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Post by muttleymk2 on Feb 4, 2018 23:00:13 GMT 1
No, that was a valve seat problem. The standard seals will stay in situ no problem if they are pushed home properly and the top of the guide is in good shape, I have built race pintos with shortened guides and double springs and still only ever used standard guide seals, never ever had one come off even when they are old and hard like me Have you tried the port profiles given in the David Vizard book? I have my own ideas
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Post by dodgerover on Feb 4, 2018 23:53:30 GMT 1
Do they work for bottom end power as well as top end, I've got a couple of heads to play with...
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Post by danclift on Feb 5, 2018 19:04:03 GMT 1
I could do with another head to play around with to get the seals sorted wondering if I could mod some cvh seals
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