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steeny · Posted: Mon Nov 19, 2007 2:54 pm Post subject: altern78ator bracket bolts

anyone know off the top of their head the size and pitch of the bolts that hold on the rear alternator bracket (78 NA)

one of mine mine dropped out, taking the alternator ground strap with it, and its sort of important that i put it back on.

cheers
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1978 924 N/A
she's gone.....

leadfoot · Posted: Mon Nov 19, 2007 4:48 pm Post subject:

M8 X 18 according to the PET
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Ozzie · Posted: Mon Nov 19, 2007 5:12 pm Post subject:

1.5mm pitch IIRC
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

leadfoot · Posted: Mon Nov 19, 2007 5:26 pm Post subject:

seems like a large pitch for an M8 ozzie... would try a 1.25...
leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Ozzie · Posted: Mon Nov 19, 2007 5:27 pm Post subject:

probably right
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Hang on steeny.
There are 2 types of top rear bracket. The one Leadfoot and probably Ozzie has is made from folded 3mm sheet metal. The one you have is the cast aluminium type and is 8-10mm thick IIRC.

With a washer and/or split washer under the head there will be insufficient thread with a 18mm bolt. Which you wont get unless you go genuine. 20 is standard but get a 25mm. Sure I`m using 25 on the thinner bracket anyway (with flat and star washer) as it is preferable to use the longest possible bolt. Get a 25mm and even though its a PITA screw it in without the washer and check it doesnt bottom out. Then fit the washer and tighten up.

Standard coarse thread M8 is 1.25 pitch.

Roger