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?
14mm wrench size is correct for 10mm adjuster nuts, the 8mm adjusters (1.7) nuts have a 13mm head.
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.......
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