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Broken engine mounts

Posted: Sun Oct 06, 2019 10:23 am
by bbonomo
Hi, I got a little too ambitious off-roading during the Rocky Mountain Pinzgauer Treffen this summer and I think I busted my engine mounts. After hitting the under side of my truck pretty violently on a rock I noticed that my idle was increasing on its own. It wasn't until I was back home and attempted to track down the problem that I noticed the engine had perhaps shifted 1/8 to 1/4 of an inch.
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Similarly, when I'd start the truck I'd hear a pretty loud, distinct banging, but only during starting. I'm not attributing the banging to the end of the exhaust manifold making contact with the collar into the heat exchanger.
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Side note - Not being much of a mechanic, I assumed that breaking motor mounts would've been more catastrophic than what I'm seeing here. I also assumed that bolts would've passed through mounting points on both the engine and the mounts on the center drive line.

Do I understand correctly that bolts terminate into this rubber block and the bolts from each direction just tie into that? (ie there's not a single bolt all the way through the rubber block?)

In other words, I'm trying to determine whether or not I sheered a bolt in the engine mount. I don't believe i did. I believe I just effectively sheered the rubber block.

I found a nice write up on the forum about using a come along through the antenna plate on the top of the cab to capture the engine and lift a bit to allow replacement of the rubber blocks. I'm not exactly sure how to do that without potentially damaging a lot of stuff on the top of and around the engine. Any advice for replacing these would be greatly appreciated! I might use it as an opportunity to drop the flex kit in on the exhaust as well...


Re: Broken engine mounts

Posted: Sun Oct 06, 2019 12:16 pm
by rmel
Group 1 70 in documentation shows a blow-up of the mounts.
Also here at EI ... c_178.html

Wow that must have been one heck of an impact.

Re: Broken engine mounts

Posted: Sun Oct 06, 2019 2:21 pm
by bbonomo
Indeed it was. Once I identified the broken mounts I immediately printed this diagram. I’m just trying to wrap my arms completely around the repair and what I’m potentially getting myself into

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Re: Broken engine mounts

Posted: Sun Oct 06, 2019 5:22 pm
by pcolette
Once you have the replacement engine mounts in hand, you'll be able to visualize how they need to be slipped into place. They are relatively simple parts. You shouldn't have to lift the engine very much to replace the mounts and the engine is relatively light, as engines go.

If you add your location to your profile you may find that someone near you has done this and will comment.

Re: Broken engine mounts

Posted: Sun Oct 06, 2019 5:40 pm
by bbonomo
My location is updated. Thanks for that advice. I appreciate the feedback!