transmission mount

look 171 · 01-02-2005, 07:10 PM

Can someone be so kind and post a picture or drawing of the trasmission mount and the parts necessary. I think one fell out completely, and the other one is loose. Does it sit on a round thick plate connected to a bar that goes under the tranny. It is an 88 930, I think it is similar to all the cars. I am getting something similar to clutch chatter like crazy. I guest it is not safe to drive it to the mech. What kind of damage can it cause?

What causes leaking in the, I think, front of the tranny. The side that is not mated to the motor. I just had it rebuilt about 1000 miles ago. Is it normal? I just have a couple of drips on the floor and it is wet in that area of the tranny.

I can just think of the look on the face and the fight to get the mechanic to fix the problem. I was told some leaks are normal on these cars. I never had one leak before that. What do you guys think? Thanks for your help.

Jeff

5speed · 08:04 PM

Actually our host provides this under parts diagrams at the porsche main index page. The mount consist of part numbers 1-11. Hope it helps.

look 171 · 01-02-2005, 08:31 PM

Thanks 5 speed. How do you find parts page? Jeff

5speed · 01-02-2005, 08:46 PM

From the forum pages go to the top left of the page click on the Pelican logo. You will be redirected to the Porshe index page, roll down until you see the Porsche 911 index on the left hand side. The 7th link is the parts diagrams. Another way is from the main PelicanParts page hit the Porsche link and it will also bring to the Porsche index page.

look 171 · 01-02-2005, 09:39 PM

Just tried that. Now I know where it is. Thanks again 5 speed. By the way, do you have any idea what cause the whole mont to fall off like that? The whole thing is gone. Jeff

5speed · 10:22 PM

That is not something that normally happens. There had to be a mistake made by someone in the life of the car. In order for the mount to be missing three large bolts would have had to fail or vibrate off. If I had to guess without knowing the history of the car, I would say someone pulled the tranny and forgot to tighten the three bolts and they eventually fell off. Of course, that's my uneducated opinion.

look 171 · 01-02-2005, 10:36 PM

That's what I am thinking. Just had tranny rebuilt. 7 months ago. Hope pelican have em' in stock. Going down there tomorrow. I assume that it is as simple as sliping the new one in there and tighten the bolts down. Oh man, this rain is no good. We are not used to this kind of water. By the way, thanks and have a happy new year.

RoninLB · 01-02-2005, 10:46 PM

If they were not new replacements at the rebuild I'd get 2 new mounts. I'd take care on install not to strip threads.

look 171 · 01-02-2005, 10:58 PM

Strip threads? Read lots of old post in the past 2 hours. Strip threads seem to come up a lot. What should I look for? Grease on the bolts is a must? Thanks, Jeff

5speed · 12:01 AM

Grease? I hope you have not been using grease on your bolts, that might be why they came loose! Anti-seize might be what you are talking about, I like to use a SMALL dab just to coat the threads on almost all nuts and bolts. Too much will interfer with accurate torque and electrical grounding so use sparingly. Off the top of my head 58ft/lbs for mount to body bolt and 56ft/lbs for the two mount to crossbar bolts. I am partial to the Wevo mounts and remember to get new grade 8 bolts since your missing one side.

RoninLB · 01-02-2005, 11:58 PM

fwiw, If you want entertainment?

Run a ground strap from a mount bolt to the starter bolt.
I few areas of the tranny mount pin, tub, washer, etc need connection attention.

I only use dielectric on elec connections. I won't use copper anti-seize 'cause it's still not as pure as dielectrics.

You could go wild and bridge both mounts to the starter case with the strap. Safety wire into the strap for a few attachments for be a very cool install. The installer would look like he knew what he was doing imo.

look 171 · 01-03-2005, 09:06 PM

5 speed, no grease. only a little tiny bit on the lug nuts.

Ronin, why do I need a ground strap between the mount and the starter bolt? What is a safety wire?

Just found out this afternoon that I can't replace the mounts by itself. I have to replace the whole assembly. Just like the picture 5 speed posted. It is a 88 930. The dealer wanted $1100.00 for the damn thing. No after market that I can locate. The rubber parts are pressed in . Not like the NA cars. Over 1K for mounts. Holy *****. Found no used ones. If I did, the rubber maybe bad. Wayne, are you out there.? You got something for me? Thanks.

5speed · 01-03-2005, 11:28 PM

Duh! I didn't even notice that you had a 930. I haven't seen any aftermarket mounts either, you might be stuck with OEM part number 930.375.031.00. Give our host a call to make sure it is the right one, the part is listed as H-375-031-00 $541.25 better than $1100.

I think Ronin was addressing the electrical ground issues that I had mentioned. The additional straps would solve any ground issues that corrosion or too much anti-seize might cause.

exhaustfumes · 01-04-2005, 03:04 AM

three items:

someone, somewhere, has to have a wrecked turbo that will sell you used stuff. there are lots of porsche dismantlers that can find this for you. of course new is better, but what's your budget? and why not chase the shop who did the rebuild/install to pay for it?

regarding stripped threads, this is regarding the 2 large bolts that thread into the chassis. you will need a floor jack and helper to jockey the trans around to get proper alignment and get these bolts started, and not cross-thread the holes in the chassis. my 911 just BROKE one of these bolts, so i've got bigger problems.

also, your leak. since the trans is now being supported by the shifter shaft, it has put lots of pressure on the shift shaft input seal, and now it is leaking. you can DROP THE TRANS and replace it (yep, back to square one), or check the pelican tech articles for an article i wrote years ago on how to do this while trans is still in the car.

good luck.
joe

RoninLB · 01-04-2005, 03:46 AM

Quote:

Originally posted by 5speed

I think Ronin was addressing the electrical ground issues that I had mentioned. The additional straps would solve any ground issues that corrosion or too much anti-seize might cause.

yes +

look 171 · 01-04-2005, 01:55 PM

Thanks guys, I'm doing that for sure. Great tip.

Jeff

RoninLB · 01-04-2005, 02:29 PM

Look for the strap lug at the starter mount.

kucharskimb · 01-04-2005, 06:13 PM

while we're talking about trans/engine mounts...

i was interested in the ones energy suspension sells.

http://www.energysuspension.com/pages/motmt.html

but they do not make any for P-cars. i've seen the solid ones, and that is NOT what i'm looking for. has anyone seen any poly/steel mounts available for us?

later
matt

5speed · 01-04-2005, 06:42 PM

kucharskimb- I don't know of all the mounts available but from what our host offers you got five choices.
1) OEM stock rubber mounts - soft for compliance and less vibration.
2) OEM sport (cab) rubber mounts- harder rubber
3) WEVO semi-solid - uses elastomeric, harder than both OEM rubber
4) Competition solid - solid steel
5) Tarett solid - solid aluminum

There is probably more out there, but it seems the WEVO mount is as close to the poly that you mentioned.

kucharskimb · 01-04-2005, 06:57 PM

5 speed
thanks for the info. don't know why i only saw the oem and solid. you ARE the man!!