Valve Jam Nut not 13mm |
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Valve Jam Nut not 13mm |
4x4loyr |
May 22 2020, 04:29 PM
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#1
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Newbie Group: Members Posts: 28 Joined: 25-September 14 From: So Cal Member No.: 17,951 Region Association: Southern California |
I'm attempting my first valve adjustment on my '74 2.0 ... and after thinking I finally got an idea as what to do, I was going to loosen the jam nut to move the adjuster screw, and my 13mm wrench does not fit.
A 14mm will fit, but it has a little slack. I didn't want to go any further without a little input. The motor was rebuilt just before I purchased the car several years ago, but I have zero paperwork on the rebuild. Any ideas? Suggestions? Or, are these just worn/rounded 13mm nuts? Thanks |
porschetub |
May 22 2020, 11:53 PM
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#2
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I'm attempting my first valve adjustment on my '74 2.0 ... and after thinking I finally got an idea as what to do, I was going to loosen the jam nut to move the adjuster screw, and my 13mm wrench does not fit. A 14mm will fit, but it has a little slack. I didn't want to go any further without a little input. The motor was rebuilt just before I purchased the car several years ago, but I have zero paperwork on the rebuild. Any ideas? Suggestions? Or, are these just worn/rounded 13mm nuts? Thanks Worn and rounded some people seem to overtighten them to crazy torque which isn't needed... |
pilothyer |
May 23 2020, 04:15 AM
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#3
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Member Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States |
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Mark Henry |
May 23 2020, 06:23 AM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
14mm wrench size is correct for 10mm adjuster nuts, the 8mm adjusters (1.7) nuts have a 13mm head.
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Gatornapper |
May 23 2020, 06:37 AM
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#5
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Senior Member Group: Members Posts: 1,205 Joined: 22-September 17 From: Woods west of Richmond, VA Member No.: 21,449 Region Association: South East States |
Interesting. Just did my '76 2.0, and yes, they were 14mm - 13 would not fit - and the 14's were a bit loose - but NOT from wear. I'd measure them now with a precision digital caliper, but the valve covers are back on.
I wanted to use a 6 pt. box wrench but only have 12 pt. and loosened them with no problems. Previous valve adjustment by local Porsche dealer - think he used a 1/2" impact wrench to tighten them on last adjustment about 3,000 miles ago......took hammer taps on end of wrench to break the nuts loose.........but no damage to corners on nuts thankfully....... GN I'm attempting my first valve adjustment on my '74 2.0 ... and after thinking I finally got an idea as what to do, I was going to loosen the jam nut to move the adjuster screw, and my 13mm wrench does not fit. A 14mm will fit, but it has a little slack. I didn't want to go any further without a little input. The motor was rebuilt just before I purchased the car several years ago, but I have zero paperwork on the rebuild. Any ideas? Suggestions? Or, are these just worn/rounded 13mm nuts? Thanks |
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