Late Rubber Engine Mounts

JJM86 · Posted: Sat Apr 12, 2014 6:49 pm Post subject: Late Rubber Engine Mounts

Hey All,
I have a '71 Squareback that I'm gathering a list of things to do while I have the motor out (when I pull it) and would like to refresh the rubber mounts that hold the rear hanger to the body.

For those of you who need a picture, these: http://www.vwispwest.com/311199301B.html?page=1

I've looked around in the classifieds (and obviously ISP has some) but I'm not too keen on replacing 40 year old rubber with 40 year old rubber. Mine are still intact but definitely cracked, so I'd like to do them.

What I have been pondering is the possibility of 'rebuilding' them, i.e. finding new rubber bushings and taking the mounts apart to install the bushings. Trouble is, I don't know of anywhere that would have quality rubber bushings or beefy rubber rounds that would support the load and provide good service life.

Anyone done this or have any input? Honestly, I haven't investigated them closer than inspecting them, so I'm not even sure if they can come apart to do what I'm thinking about. Maybe I'll have to get on that...

Any thoughts, or are people just running their originals?

-Jeremy

sub-hatchtim · Posted: Sat Apr 12, 2014 7:17 pm Post subject:

when I had a late model type3 I was going to modify porsche 911 engine mount's, food for thought
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76 911S

grandpa pete · Posted: Sat Apr 12, 2014 7:31 pm Post subject:

look through some of the build threads...Someone made there own out of white Teflon blocks they turned down on a lathe
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vlad01 · Posted: Sat Apr 12, 2014 8:20 pm Post subject:

Bobnotch · Posted: Sat Apr 12, 2014 8:28 pm Post subject:

I was going to say the same thing. Here's Root Werks's solution, as he was the first to try it.

FastyOrange · Posted: Sat Apr 12, 2014 11:08 pm Post subject:

There's also the ob_wan method:

http://www.thesamba.com/vw/forum/viewtopic.php?t=553874

ob_wan used polyurethane bushings and fabricated the mounts with a combination of new and old parts. One nice feature of his mounts is that they are adjustable.
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72 FI Fastback
70 FI Fastback (Parts Car)

Bobnotch · Posted: Sun Apr 13, 2014 8:33 am Post subject:

JJM86 · Posted: Sun Apr 13, 2014 2:59 pm Post subject:

Thanks for the great info. It's funny to me that searching for 'engine mount', 'motor mount' and 'mount' in the T-3 forum didn't turn up either of these other guys' solutions. I must be doing something wrong...

Anyhow, it's ironic that several of you mention the 911 mount because I work for a Porsche mechanic and was remarking to him about possibly using the 911 mount. I'd looked at some on a '73 chassis but at first glance it looked like it wouldn't work because of the way their rear hanger works (w/a long bolt). Seeing it done and looking at the replacement part I can see now how a long through bolt combined with either a fabricated end or the salvaged original part to hold the hanger could work.

Nice thing about 911 parts is I could probably even get a real deal Porsche one if was inclined to spend the extra $ (vs Meyle), not to mention the fact that high quality parts are available... It'd be sweet but overkill and prohibitively expensive (at ~$600/pair) to use the 964/993 style ones with silicone grease inside. Maybe for one of you guys running a big stroker or a turbo... Wink

Looks like I'll have to drum up some 911 mounts and start mocking things up. I think this would be the best option for my situation, although I do like the 100% DIY approach that ob_wan took. Looks like a really nice job, too.

Thanks, guys!

catbox · Posted: Tue Apr 15, 2014 12:52 pm Post subject:

Those ob style mounts are just what I have been looking for!
Now to just add that to the mile long list of things to do for my car....
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"...these cars were preferred by the racers because the strut front suspension results in far superior handling than the regular torsion bar front end..." - Keith Seume.

TommyBoyGomes · Posted: Wed Apr 16, 2014 1:08 pm Post subject:

I feel your pain buddy, I looked for NOS engine mounts for 3 years and eventually gave up. Every now and then I would find some used ones, but they were difficult to find and they were all in really rough shape. I have a used one in not-too-bad-but-still-old shape if you want it.
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1969 Squareback, 1776cc
1990 Vanagon Multivan

Angelo Amato · Posted: Thu Apr 17, 2014 4:54 am Post subject:

After discovering the 911 mounts thanks to this forum, I have fitted them to my Fastback.

The twist with mine is they are holding up my type 4 motor, the mounts have come out really well.

will get some pics posted up later. Wink

JJM86 · Posted: Mon Oct 13, 2014 9:03 pm Post subject:

I thought I'd send an update to this thread, as I'm currently testing a solution to the engine mount problem that I think is going to work.

In short, I'm using the standard Porsche 911 mounts and large washers combined with a 'yoke end' and some grade 8 hardware from the local hardware store. The piece of the puzzle that I'm testing is the yoke end. I chose this because it seems pretty strong, it's already fabricated, and it fits the end of the engine carrier perfectly (and tightly). I'm curious to see if the single bolt hole holds things tightly enough so that the engine's torsional forces don't shift it around.

Here's a photo of the parts all laid out with their part numbers and prices I paid here in SF at my favorite (but not the cheapest) hardware store. I got the mounts and washers for "free" (I traded labor for parts w/a Porsche mechanic) so I don't know what they'd run retail. I tried to write an explanation in the photo, too but it got messed up and I didn't feel like re-doing the whole thing...

Image may have been reduced in size. Click image to view fullscreen.

I chose to grind/cut about 10mm off the threaded 'collar' of the yoke end so that the distance between the engine carrier bolt hole and the bottom of the mount would be correct. I tried this without grinding yesterday and had to shim the mount off the body about 10mm, which i don't think is a good long term solution (unless I had a nice plate fabricated). This left about 11mm of threads in the collar, which I think will be good enough (we'll see how this test goes).

I took some photos of it installed but they're on my shop computer, so they'll have to come later.

Angelo Amato · Posted: Wed Oct 15, 2014 3:18 pm Post subject: about time for some photos....

my version for 911 mounts in a type 3 motor in a type 3 Laughing

.....

Angelo Amato

MY setup for a type 4 motor in a type 3 !

Bobnotch · Posted: Wed Oct 15, 2014 5:22 pm Post subject:

W1K1 · Posted: Thu Oct 16, 2014 12:42 pm Post subject:

wouldn't something like novibra's vibration mounts work?

http://www.spaenaur.com/pdf/sectionJ/J15.pdf
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1965 squareback 1500E
1971 bay window westy- subi swap

Bobnotch · Posted: Thu Oct 16, 2014 2:31 pm Post subject:

Angelo Amato · Posted: Fri Oct 17, 2014 7:28 am Post subject:

The 911 ones look made for the type 3 and could pass as oe. Dont know why you look at any other options t.b.h.

JJM86 · Posted: Mon Oct 20, 2014 9:17 pm Post subject:

Those vibration mounts look like they could work. I chose to go w/the 911 ones partly because they were available to me and in case I ever have to replace them, they will be easy to find again. Probly won't have to replace them, though...

Here are some photos of the mount in the car:
From the engine compartment

Underneath (x2)

Detail of bolt threading through yoke end

I'm going to try setting up the other side this week/weekend to see how they perform together. So far so good with one side installed.

JJM86 · Posted: Mon Oct 20, 2014 9:28 pm Post subject:

Bobnotch, that's a good point about having two through bolts as an added safety feature. Something I hadn't considered before. At this point, I'm still in trial mode, with one new mount and one original, to see if the new setup has problems. I was debating drilling a smaller diameter hole (smaller than the manufactured one) in the yoke end and putting a hardened pin or smaller high grade bolt through there in the top hole, if it seemed like it needed it. I'm not too keen on drilling a 2nd hole but your comment makes me think I should set up something as a fail safe, in case the single bolt did give way.

Hmmm.... Think


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