AMC V8: motor mounts

[Deerejeep]

Okay folks. I cleaned what I believe to be the solid mounts from the V8 AMC motor mounts I purchased. My question: if they are solid is there a reason to replace? Also, what advantage if any is it to go to polyurethane for the motor?

 

[CJ]

If your talking about the mount in the pic, that looks like a standard two piece engine mount.
The solid mounts I ran were made out of aluminium. RR's one piece mounts are poly.
A pic of standard mounts.

 

[Deerejeep]

If your talking about the mount in the pic, that looks like a standard two piece engine mount.
The solid mounts I ran were made out of aluminium. RR's one piece mounts are poly.
A pic of standard mounts.

Thanks CJ. So I should just replace with poly? Sorry to be so dense on the topic but I thought I recall, the more solid mount the better for the engine and poly being good for body mounts etc.

Also curious if I have these mocked up in the right mounting holes for the V8? I've got the driver side in the from 4 holes.

 

[Hedgehog]

Remember this isn't a drag car where every bit of horse power is important. You have to live with this Jeep hopefully for a long time. Solid mounts transmit every bit of engine vibration into the vehicle making life miserable in the long run.

The poly mounts are supposed to handle engine oil and other vehicle related chemicals better than rubber. With that being said inexpensive ol' rubber mounts last a very long time.

Put the mounts on the engine before dropping the engine in. I like to leave every thing loose. Being loose allows you to wiggle things around some while the engine is finding it's home. when she's close, but the wrench to the mounts snugging things down.

 

[Deerejeep]

Remember this isn't a drag car where every bit of horse power is important. You have to live with this Jeep hopefully for a long time. Solid mounts transmit every bit of engine vibration into the vehicle making life miserable in the long run.

The poly mounts are supposed to handle engine oil and other vehicle related chemicals better than rubber. With that being said inexpensive ol' rubber mounts last a very long time.

Put the mounts on the engine before dropping the engine in. I like to leave every thing loose. Being loose allows you to wiggle things around some while the engine is finding it's home. when she's close, but the wrench to the mounts snugging things down.

Your advice is much appreciated, I over think this stuff at times. Here is what I know.

OE rubber replacement $20 for a set.
Solid mount $80
Poly $175-$200

The 2-3 sets or rubber I have here don't appear to have any damage. I think I'll go rubber.

 

[Hedgehog]

My advice exactly. It really isn't clear to me why the poly mount costs so very much. The rubber mounts work and have worked for a very long time.

 

[CJ]

Rubber,,, rubber,,, they last and work.

 

[Deerejeep]

Rubber,,, rubber,,, they last and work.

Ordered, ordered, ordered.

 

[Deerejeep]

Alright well. Okay here are the mounts received vs. the originals.

Left is new right is original (just to be clear the left pictures is the same as the new mount, not actually the new mount)


Here is the diagram showing how the original mount.


Here is the way I have the new mount setup to accommodate the restricted plate.


So what am I missing here?

I hate to overthink this, but I also want to just drop the engine in and not have to Jack with pulling it again. Plus I've got a lot of cash invested in the engine and want to make sure it is mounted correctly. Appreciate the help.

 

[Hedgehog]

I honestly don't know if it makes a real difference but I mounted the tab up. The configuration you show in your first pictures look correct to me.

 

[Deerejeep]

I'm not sure it does either. I looked at a 6 cyliner mount and a wagoneer at a local shop yesterday. Both were different in terms of the rubber placement too. I ordered another set from morris instead of summit to see if they are different. i'm after the ones that CJ showed, the book and the ones that came with the CJ V8 mounts I purchased.

 

[Deerejeep]

Okay. Final answer is neither of the two sets I've purchased mount in the same way as the originals allowing the Restrictor plate to go over the top of the "tab".

Pictured is the Crown, summit and the original CJ mount. So mount away y'all guess it does not matter.

 

[Hedgehog]

I spoke with my Jeep guy tonight about your restrictor plate question. He sais that the old mounts had a separate restrictor plate, but the new mounts have the plate molded into the plate already. I was worried about this because my recent 360 install did not include a restrictor plate. The AMC 304 didn't have a plate on the mount so I never considered installing one. This thread had me worried. He assured me that there wasn't anything to worry about.

 

[Deerejeep]

I spoke with my Jeep guy tonight about your restrictor plate question. He sais that the old mounts had a separate restrictor plate, but the new mounts have the plate molded into the plate already. I was worried about this because my recent 360 install did not include a restrictor plate. The 304 didn't have a plate on the mount so I never considered installing one. This thread had me worried. He assured me that there wasn't anything to worry about.

Thanks for doing some research. That makes sense to me. I guess I'm all Restrictor plated up. The one on the mount facing down and the original up.