Colin993

Maybe this is just a daft question, or maybe because I'm a Scot, but here it is..

Why are the transmission units mounted using M6 bolts, through M10 holes in the units and M8 holes in the spacers?

All previous threads I've read deal with alignment, cables and switches. Even bolts out of fasteners. The bolts used by Porsche are threaded and the damage to the bolts and the transmission holes is significant.

Put another way, are the units not more secure by re-tapping for an M10 bolt, drilling the spacer and limiting the movement at the unit?

From examining the wear marks/damage to the units (both replaced by Porsche for previous owners) I think that alignment closing issues originate with these mounts.

goldcountryboy

Planned obsolescence ?

gristle101

My 964 cab (which should be identical in cab top opener design) is not like this; M6 bolts, holes and spacers all the way and a very snug fit.

Colin993

Thanks gristle101. Gone into the 964 forums and hit the jackpot. This has been a problem for a long time and goldcountryboy might be right. Good revenue when a transmission unit costs about £400 plus fitting on this side of the pond.
The only explanation seems to be that some allowance is needed for movement but all goes wrong when the bolts get loose. Especially as Porsche parts use 2 bolts without shoulders for the short spacers.
How you have M6 all the way is a surprise gristle101 because if the part number is 911 561 045 67 (left side) or 911 561 046 67 (right side) the holes in the unit are 10mm. The part number changes for the 993 but the spec. doesn't.
Thanks again.