 Valve guide position 1.7 liter heads, Cylinder head work |
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| pgollender |
 May 19 2017, 08:30 AM
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#1
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Member  Group: Members Posts: 193 Joined: 5-July 11 From: Sacramento Member No.: 13,281 Region Association: Northern California  |
 After hot tanking I noticed different lengths on my exhaust valve guides. Between the four exhaust guides ( two heads) the length of the top of the guide out of the head varied by 2 mm. Is this a problem or just sloppy work from P.O. ? Does it matter ? |
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| pgollender |
May 20 2017, 09:11 AM
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#2
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Member Group: Members Posts: 193 Joined: 5-July 11 From: Sacramento Member No.: 13,281 Region Association: Northern California |
"They must be cored and driven out from the camber side, then see if they are salvageable."
Can you explain this comment a little more. I understand the part about cored and driven out, but not the "salvagable" part of your comment. I have never rebuilt 914 heads personally before, always had a machine shop do it for me. The boss surfaces and intake surfaces look intact (no magnaflux test) . I can't see any visible cracks between intake and exhaust ports or to spark plug hole. The current guides appear to be quite tight,and I can elicit no guide wobble within the bore itself. Not sure how to test the angle of the guide. Is there another step that requires evaluation of the guide bore hole that you are referring to ? Also what is the correct finished height of the guides above the boss surface once installed ? |
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Posts in this topic
pgollender Valve guide position 1.7 liter heads May 19 2017, 08:30 AM
malcolm2 It is not easy to find pictures of cylinder heads ... May 19 2017, 09:32 AM Mark Henry They're driven in, check the seat side I bet t... May 19 2017, 07:04 PM HAM Inc
After hot tanking I noticed different lengths o... May 19 2017, 07:52 PM
Mark Henry
"They must be cored and driven out from the ... May 20 2017, 10:39 AM porschetub Sorry double post. May 20 2017, 02:55 PM porschetub then this :(
I have a 1.8 bus head that did thi... May 20 2017, 03:01 PM pgollender
Guides may appear "tight" to you, but a... May 21 2017, 08:38 AM |
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