transmission mount bolts stuck

Bukowski · 10:46 AM

the bolts that hold the transmission to the mount are frozen. that would be the two on the actual mount, then the two long ones that are on the piece between the mount and the tranny. The last two might actually be glued in for all I can tell. The tranny is out.

how much heat can the (presumably) aluminum alloy take?
how much cold?
how much pounding?
how much chemical treatment?

also FYI the piece that attaches the tranny to the mount is somewhere between 100-200 bucks. this thread shows pics:

WTB piece of transmission mounting assy

UPDATE:

specifically about the short bolts that connect the rubber mount to the piece between it and the tranny: one bolt is seized in the hole. in order for a drill bit and drill to go into the bolt at all straight, I judged it necessary to detach the shift linkage arm and move it out of the way. see this thread:

tranny parts: articulated arm on shift link (?)

another update: got a spare transmission mount - the piece between the tranny and the mount - from mharisuh (thanks!). helps to understand the problem.

mhariush · mhariush's Garage

Is the transmission still on the car? I lowered the trans with the cross member, I couldn't get the bolt out of the mount either. Too little room and too old bolts in there. The cross member is just held in place by two bolts, so its really easy to remove the whole thing. You just have to undo the fuel filter.

Bukowski · 10-15-2013, 06:21 AM

tranny is out.

GHEN · GHEN's Garage

Pickle bath

Bukowski · 10-20-2013, 01:59 PM

It occurred to me today to try hammering not on the bolts, but on the mount. Tried simultaneous bolt/mount hammering with two hammers. I thought it was a good idea, but it is still stuck.

also been trying dust-off can held upside down for a very cold blast.

tamathumper · 10-21-2013, 03:49 AM

How much PB'Blaster or Kroil have you applied to it?

Bukowski · 10-21-2013, 04:56 AM

Quote:

Originally Posted by tamathumper

How much ... Kroil have you applied to it?

a bit, also freeze-off - almost a good amount.

If I had a good indication it will come loose, I would set it up to do a good soaking. I don't want that stuff getting in the little seams/rubber seals/holes/etc. of the tranny, let alone all over the floor/pavement.

tamathumper · 10-21-2013, 12:07 PM

Can you get a chisel on the bolt head? A good sharp rap or two in the direction of rotation might do a lot to free them up. It'll make a nick in the bolt head, but you probably want to replace those anyway.

Bukowski · 10-21-2013, 01:27 PM

Quote:

Originally Posted by tamathumper

Can you get a chisel on the bolt head? A good sharp rap or two

yes, a good idea - need to get such a tool but then, I might as well be looking for a customized driver to fit in there for maximal force application.

Quote:

Originally Posted by tamathumper

in the direction of rotation

these bolts do not rotate - these are the ones actually in the transmission, the ones that are described in the shop manual. Sorry it is a nuisance to find proper language to discuss these bolts and mounts without losing track of which is which, since they are all bolts and mounts. ... could use Porsche part numbers...

Quote:

Originally Posted by tamathumper

might do a lot to free them up. It'll make a nick in the bolt head, but you probably want to replace those anyway.

yes I see how this makes more sense if the bolts were rotating.... I in fact have one of those I need to free up as well... for another thread perhaps...

Bukowski · 10-29-2013, 06:36 AM

added a link to another thread I started, related to this.

fiat22turbo · fiat22turbo's Garage

Quote:

Originally Posted by Bukowski

a bit, also freeze-off - almost a good amount.

If I had a good indication it will come loose, I would set it up to do a good soaking. I don't want that stuff getting in the little seams/rubber seals/holes/etc. of the tranny, let alone all over the floor/pavement.

Won't hurt anything. Worst case, flush the transaxle fluid and replace with fresh Redline MTL or equivalent. Use cheap, clay kitty litter to soak up any excess fluids that get on the floor, etc.

Do you have an early or late car? From looking at the late cars, the two bolts that are fixed in the transaxle and the four that hold the mount to the crossmember should be easy to deal with by simply snapping them off, punching them out and replacing them with new equivalent bolts. Nothing really magic there, IMO.

I'm not sure how the early cars work though, I suspect they are significantly different?

Can you take a picture and post it here so we can better see your particular situation?

If you need to pull the linkage to get to the parts you're working on, go ahead. If you can't find a torque spec for the specific bolt, use a spec from a similar sized bolt and don't forget loctite to help it stay in place.

Bukowski · 10-30-2013, 01:23 PM

Quote: