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Registered User
Join Date: May 2018
Posts: 2
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new valve guides
So yesterday, I popped the head and jug. Dammit again. It looks like the jug had water in it at some time. There are a lot of pits and some scoring in the bore. The piston shows a lot of abuse as well. The head is carboned up but with a cleaning, it should be good. I'll probably lap the valves and throw in new valve guides while I'm in there.
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05-30-2018, 02:55 AM
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Registered
Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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New guides? You'll likely need to do more than just lap the valves. Guides usually need to be honed (or reamed) & seats ground (or cut). Good idea to regrind the valves, too (or replace them).
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05-30-2018, 11:30 AM
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Fleabit peanut monkey
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This is a Honda CT90 trail bike from the 70's? Looked up your first post.
Keep all your posts in this one. Makes it easier to follow. On 911's the shaft of the valves can wear under size. The benefit of new guides is undermined if the valves don't fit in there snug to allow heat transfer into the heads (that have the cooling fins  )How are you going to do the guides. Do you just press out the old and press in new? There should be some floating reamer or burnish procedure?
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1981 911SC Targa Last edited by Bob Kontak; 05-30-2018 at 11:57 AM.. |
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05-30-2018, 11:46 AM
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1981 Porsche 911 SC Targa
