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Transmission mount project

robdimond

robdimond

PCGB Member
Member
Hi all,

Does anyone have a late 944 transmission mount they could sell me or lend me (or take some dimensions if you have a means to do so accurately). Doesn't matter if it's very worn as long as it's just about hanging together.

Mine is I believe shot and rather than fork out the £250 or so that Porsche wants I would like to have a go at making a semi-solid one with a CNC part and some off the shelf rubber mounts.

Rob


 
Crikey is that how much they are? I'm taking my gearbox out in the next couple of days and I will be checking its condition.
 
How quickly do you reckon you could turn (a couple[;)]) round ? mine is now out and the rubber appears to be peeling away one side. I don't want Porsche to pull my trousers down either for a piece of rubber and metal but the car is in pieces as I am already behind doing the clutch due to a third party.
 
This is on my to do list - take the mount off, wrap it in loads of decent masking tape and pour a polyurethane mixture in.

I'be got the polyurethane mix but haven't got round to removing the mount yet, easy enough to do?
 
A few weeks I would have thought... also until I've got a quote for the machining I can't promise that it would be significantly cheaper than the OEM part.
I have heard the urethane tricks works very well, and also it's possible to swap it out without entirely removing the gearbox (lowering it on a jack apparently gives enough clearance to remove the cross member).

 
I've done the urethane filled version on mine. Easy enough to get the crossmember out with the gearbox in situ. Jack under the gearbox, disconnect/unbolt everything then lower the box a shade and the crossmember slides out with the gearbox mount still attached to it.
Filling the mount with urethane is also easy. You kind of bandage it in duck tape then pour away. Takes a surprising amount to fill all the nooks and crannies.
If you are fabricating one Rob I would be tempted to look at doing the metal part by welding together two laser cut steel components. A base plate and then a hanging plate welded together in a T shape if you see what I mean?
 
I've just ordered a medium shore polyurethane kit, I'm quite looking forward to carrying out this little repair.
 
I did it last year, seemed to work pretty well. I fitted the mount to the crossmember first & then poured the urethane in. Looks like the box will be coming off some time this year so will be able to inspect the mount & see how it's held up
 
That's an excellent idea Tom... probably a tenners worth of laser cutting. Potentially it could be done with two bits of steel angle, drilled and welded as well.
I think the machined version would be about £100 plus the rubber mounts.
 
Yep, two bits of L angle iron back to back with a couple of seam welds would work equally well. Either version might benefit from a couple of triangular fillets welding in either side to make the T more rigid in the side to side plane. I imagine the forces resulting from the mass of the transmission module making rapid direction changes I.e. when flicking the car from side to side will be pretty high and that there would be a bit of mess to sweep up if the mount were to snap.
 
BTW the OE mount looks to be designed to fail safe. If the rubber were to become completely separated, the mount wouldn't separate into two pieces because there is an interlock between the two steel components. So the box would drop a touch and it would be helluva noisy but the transmission wouldn't fall out of the chassis.

 
Hi Tom, Yes my thought was that the fail-safety must be maintained in any replacement mount. If you were just to use standard rubber bobbins then if they sheared off it would create a bit of a mess. I am thinking two part rubber mounts used with a large washer. That would leave the transmission hanging on the washers if the rubber were to completely disintegrate.

Scott, would you be able to take some measurements from your mount while it's out? I'm after the centres of the M8 mounting holes and the position of the gearbox mounting holes relative to the mounting (3 dimensions).


 
Mine - the original rubber was pretty much shot, but this has tightened things up considerably, without adding too much noise
2014-10-24100833_zps7c7694aa.jpg

 
I have spent today dismantling mine along with stripping both the mount and the crossmember for painting, the rubber had become completely separated from the bracket.
 
I've just taken my transmission mount out, measured it and put it back in again. Only took a couple of hours, leaving the transmission in situ and taking the cross member out of the rhs wheel well.
 
Does anyone know if the actual gearbox yoke/bracket is the same for the lux oval dash 944 as the Turbo S2 as ive got a Kokelen Solid Gearbox mount to fit to my 968 but i was told it doesnt fit the 968 yoke and needs an S2/Turbo mount.....Im breaking a lUX so can take the yoke off it its going to fit.
 
I believe late/early 944 mounts are very different (85.5 and later)... no idea about 968, what do the Porsche parts diagrams say?
I apologise for the anticlimactic end to this project, but I drew a nice semi-solid mount up in CAD, got a couple of quotes and it's a struggle to beat the genuine mount price, or indeed 9products/lindsey racing for their version... so I ordered a load of 80 shore polyurethane!
 
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