77 911S pulley bolt socket size

[tonyduc]

All
I could never turn over the engine using the fan pulley as all tutorials I’ve seen suggest for doing maintenance like valve adjustment. I’ve always used the crank bolt using a standard wrench (can’t fit a socket in that tight space). Looking for the proper metric size wrench now, is it 19mm ?
Thanks
Tony

[HarryD]

It should be a M12 bolts with a 18 or 19 mm head.

[TwoBluPorsches]

Originally Posted by tonyduc

All
I could never turn over the engine using the fan pulley as all tutorials I’ve seen suggest for doing maintenance like valve adjustment. I’ve always used the crank bolt using a standard wrench (can’t fit a socket in that tight space). Looking for the proper metric size wrench now, is it 19mm ?
Thanks
Tony

I don’t recall the size head on crank pulley but I’ve had luck rotating the engine using the fan pulley when I use my hand to temporarily add belt tension.
I’m using the special tool on the fan and not tightening the alternator nut.


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[tonyduc]

Thanks all. I asked because I was at a swap meet and found some long type metric wrenches, so I bought both an 18 and 19, and found that it’s the 19mm that fits.