The GT's belly pan proved that it has yet another benefit: catching important parts that drop from the engine bay.
A week or so ago, I saw what I thought was a rubber tube hanging down on the p/s of the engine bay. Upon closer inspection today, I realized that it was a bolt that had backed out, and fallen - only to be caught by the belly pan.
Most likely one that I forgot to tighten and properly torque at some point.
The 10mm bolt is 45mm long, no shoulder with a 17mm head.


(I know, in the time it took me to do this little pic and post this question, some of you would have the car up on a lift and the belly pan off. Not me. I'm a poor soul with jack stands and a one-car garage).

Before I get the car up on stands and get under there, I'd like to have a good idea of where I'm heading, and for selfish reasons, minimize my under-car time by leaning on the gurus here.

The search button is my friend and a "45mm" search in Dwayne's TBWP thread returns the A/C pivot bolt as having these measurements (thanks, Dwayne!)
Are there any other engine bay bolts (likely a/c, alternator, p.s., air pump component mounts or associated brackets) that share these dimensions?

 

The power steering pump as two 13mm and one 17mm if I remember well.
Don't remember the size...

Edit: It's not on the pump itself but on the bracket.

 

M10x45 with full thread. IIRR original Porsche bolts would not have full thread when they are longer than 30mm. However there is just one exception. Is it 1.25 or 1.50 thread? If 1.25 it can only be AC compressor upper mounting bolt. Rear bolt is only one in entire car which is M10x1.25x45.

 

Thanks for the quick replies.
I find it amazing that you can ask such a technical question like I did, and get spot-on answers like yours in an hour. This kind of support makes 928 ownership so rewarding.

 

Yup aircon compressor pivot bolt.

Came to mind when I saw M10x45, since recently I replaced mounts and pan gasket and noticed front pivot bolt was missing, so had to check dimensions to order replacement. Note it's the rear 45mm. Front is 33mm and would be blocked from backing out as it was a fiddly job installing it!

It's an important bolt - you don't want to risk vibration of compressor taking chunk of block off along with bracket. I suspect it wasn't torqued correctly when someone replaced drive belt, since it has high torque spec (40Nm or 45Nm I think)

 

And, the compressor has been known to shed fasteners for no apparent reason, resulting in bracket replacement when the asymmetrical load takes out the bracket itself once the culprit leaves....