dmcampbell

3M window quick set polyurethane in tube for standard caulking gun works great. You can buy it at nearly any car parts store. Bought an old mount and cleaned up, applied 3M product and let sit for a few days in the sun. Install as above. Mike

turboS_swede

Just did mine using Polyurethane from McMaster-Carr and a spare transaxle mount I picked up online (so I wouldn't have my car down while I waited for the poly to cure):









Now I just have to install it, hopefully the rain will stop so I can get out to the car and finish the task.

Justin S2

What was the durometer # that you guys used? 65 or 80?

Thanks

V2Rocket

80

Tom M'Guinn

Just getting ready to install a semi-solid mount and appreciate this post! Curious why you have to undo the shock bolt? With the car jacked up, that doesn't seem to be in the way? I'm sure I'll find out soon enough, but figured asking questions online takes a lot less effort than actually going out to the garage and working.

V2Rocket

I found the brake rotor was in the way of the crossmember sliding out from the side, so removing the bolt to drop the arm down got another 1-2" of clearance.

Tom M'Guinn

I see, thanks, sounds like a little jockeying needed. Appreciate the help!

Tom M'Guinn

Thanks again. Came right out without much of a fight. Undoing the shock mount was genius. God knows how long it would have taken me to think of that. About the only thing I had to do that you didn't list was remove the pinch bolt that holds the shifter rod to the tranny linkage (the one that's safety-wired in place). I couldn't get one of the long M8 bolts out of the mount otherwise, and the tranny would hang up on it.

V2Rocket

I've never had to mess with the linkage - there's always been *just* enough room to wiggle the bolts out of place.

gregeast

Getting ready to do this myself, thanks for the excellent pictures V2.

Two questions:

1) It looks like the mounting holes are going to get filled with urethane, how did you deal with that?
2) How hard/easy is the urethane to work with once it's dried? Can I trim it easily?

V2Rocket

I greased the threads of the 4 mount-to-crossmember bolts and threaded them into the mount before applying the urethane.

This way the bolt holes/threads stay clean.

I didn't have to cut anything but it is firm enough that probably a hacksaw would do the trick.
You'd be there all day with a utility knife.

gregeast

Ah ha!

My challenge is that I bought a spare mount to do this offline from Lart but didn't realize that it didn't include the side mounting brackets (my fault/ignorance, not Luis's). I'm not looking to make the mount extremely firm, just tighten it up.

I can apply plenty of urethane for that purpose without the brackets but haven't quite worked out how to get them in place after the fact...

Tom M'Guinn

Hey Greg, you've probably read all the posts, but in case you haven't, see my video of the 60 vs 80 hardness urethane from McMaster in the thread below:

https://rennlist.com/forums/944-turb...arisons-2.html

I'd do the 60 again without hesitation. The firmer the mount, the louder it is and the more vibration it transmits to the cabin. I did end up trimming it a big with a straight razor blade so it would sit flat against the cross member -- not sure it would have been so easy with the 80. Better masking/planning could have avoided the need for trimming though...

Lart sent me the side brackets when I got my mount from him, so wonder if that was just a mistake... I'm sure he can get you a pair either way. I wouldn't try to fill it without the side brackets in place. By having them in place when you fill it, you'll fill the entire void, which is what you want to avoid the side to side movement. Speaking of which, see posts 88-91 in the thread below, and consider boxing in the brackets. I assume the urethane would distribute the lateral force and reduce the chance of cracking, but better safe than sorry.

https://rennlist.com/forums/944-turb...rvation-7.html

gregeast

Thanks Tom, I ordered the 60 based on your experience.

I'll check with Lart and see about the brackets, that would greatly simplify things. Interesting thought on boxing in the brackets, I do have a welder but I don't know if I even qualify for Leap Day status, never mind weekend welder status...

gregeast

And here's why I make sure 944 parts I buy on ebay say "Lart's Porsche Parts" if at all possible: I pinged Luis on ebay today to see if he had the brackets that I could buy and he's sending them to me tomorrow, no charge. Above and beyond as always.

To top it off, Tom offered to weld up the brackets for me, also very generous.

Couldn't do it without the Rennlist community.