MadMarkie

Hi Bob (or anyone else who can help),

There is currently an RS engine mount feeding frenzy on the 993 board, and the topic of RS transaxle mounts has come up. IIRC, there have been a few threads on this topic here in 964 land. The search function struck out... so I figured I would see if my questions could be answered here:

-Three flavors... stock (hydraulic?), RS and Cup?
-Part numbers for each?
-Ease (or PITA) of replacement... transaxle comes out... some sort of puller?

My car already has the RS engine mounts and short shifter... but I am interested in the trans mount as well, provided I don't have to drop the engine/trans out.

TIA, , Mark.

tom_993

Hi Mark,
The only part I can answer is that I don't think the stock tranny mounts are hydraulic. I think they are rubber.

Tom
'95 993

Cupcar

Sure here are the part numbers. The mount is not hydraulic, each of the mounts appears the same but they are made of different hardness rubber.

Removing the mount is difficult without removing the transmission for a trip to a hydraulic press to remove it. I made a tool to do it in my car, but the force required made the tool almost usless after a couple of remove install cycles. If I had made the tool of steel rather than aluminum it would have probably worked forever, save for the bolt I used as the pulling element which tended to strip even though it was a 10K fine thread bolt.

The part numbers are:

964.375.055.02 Normal Part-softest
964.375.055.80 RS part
964.375.055.70 RSR part-hardest

viperbob

Cupcar,

Do you have the dimensions for the mount by chance (like OD and bolt hole size)? I have a porsche tool for pressing in and extracing wheel bearings on the rear of a 911 Carerra. The mounts look like that might be about the same size.

Thanks

Cupcar

The O.D. is 74.4 mm, the bolt hole is 12.6 mm.

Here is a picture of the tool I made before it was used. The bolt is not the one I used. It is designed to R&R the mount with the engine in the car by stacking the rings during use.

MadMarkie

Thanks Bob (Bobs actually, and Tom) for the excellent info.... now I just have to decide if I want to do it now, or wait until the transaxle comes out for short gearz and LSD, which is a few items down the list.

Cheers, Mark.

viperbob

OK, this should work. The wheel bearing in the 911 is 80mm, and the bolt size is 12mm, so assuming enough room this should work.



Here is the tool with a wheel bearing in it and the place on the suspension arm where it was removed.

Cupcar

I think you may need to shorten the bolt to clear the body. Maybe you can undo the shift linkage and loosen things up and drop the front of the gearbox to get your tool in. Looks interesting.

viperbob

It has a gigantic nut and really long bolt that could easily be shortened... That is why god created chop saws....

Same concept as the one you made. It is a Porsche tool, strong, and designed to remove and install large pressfit bearings....