 1.7 valve clearance spec?, One more time please |
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| Porsche Rescue |
 May 27 2009, 04:43 PM
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#1
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Saving and Enjoying Old Porsches  Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None  |
I know I've seen posts on this but when I search I get way too many hits.
I have a '70 1.7. My 1976 vintage Haynes manual says .15mm(.006") for intake and exhaust. I also have a vintage 1972 Carbooks manual which PO gave me with the car covering only '70-72 914's and it says .10mm (.004") for both. I just checked # 1 and they are both at .004. Should I go to .006? Was the spec. changed for early cars at some point? |
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| dr914@autoatlanta.com |
May 27 2009, 05:02 PM
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#2
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914 Guru Group: Members Posts: 7,841 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
QUOTE(Porsche Rescue @ May 27 2009, 03:43 PM)  I know I've seen posts on this but when I search I get way too many hits. I have a '70 1.7. My 1976 vintage Haynes manual says .15mm(.006") for intake and exhaust. I also have a vintage 1972 Carbooks manual which PO gave me with the car covering only '70-72 914's and it says .10mm (.004") for both. I just checked # 1 and they are both at .004. Should I go to .006? Was the spec. changed for early cars at some point? .006 |
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| Porsche Rescue |
May 27 2009, 06:17 PM
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#3
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
OK, .006 it is. But, does anyone know if the spec. was changed by Porsche (VW) at some point or is my old manual in error?
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| Bleyseng |
May 27 2009, 11:32 PM
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#4
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Far as I know its always been .006 only the sodium filled exhaust valve equiped cars (2.0L) had the .008. .004? sure you weren't looking at a type 1 spec.
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| Porsche Rescue |
May 28 2009, 08:56 AM
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#5
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
Thanks Geoff. Using a book (which I like better than Haynes for some things) "Porsche 914/4 1970-72" by E.S. Schechter published 1972 by Carbooks, Inc.. Brooklyn, NY. Calls for .004" in text describing the process and in the spec. table.
Looked at my owner's manual but can't find spec or process there as in 356 manuals. Just says do it every 6000 miles. |
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| roadster fan |
May 28 2009, 04:09 PM
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#6
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Project Frankenstein !!!!!!!! Group: Members Posts: 1,009 Joined: 24-November 05 From: Aptos, CA Member No.: 5,184 Region Association: Northern California |
I think it is an error that was in one manual and that data has been incorrectly included in many subsequent manuals much like rear brake venting clearance.
the consensus from the experts here: .006" Jim |
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