Slant Six Forum :: Changing motor mount bushings

The bushings in my '74 Duster's motor mounts are completely shot, so I ordered a new pair of Anchor bushings.

Quote:

The bushings in my '74 Duster's motor mounts are completely shot, so I ordered a new pair of Anchor bushings.

Not what you asked, but for the trouble you're about to go to, you'd do well to get better new bushings than that 3rd-world compressed-cow-dung junk from Anchor...

These urethane ones. They don't mention the slant-6, but the same insert is used in all the '73-up spool-type engine mounts. If you're after a urethane trans mount for your '74, it's this one.

I don't think you'll experience any level of engine vibration sufficient to cause annoyance.

I put a poly trans mount in my Duster and it increased the level of vibration in the car a bunch.

Personally I'd stick with a rubber trans mount, especially with a stick.

Not sure about poly motor mounts, but my solids sure transfer vibration.

I put a poly trans mount in my Duster and it increased the level of vibration in the car a bunch.

I have the poly bushings too, massive vibration compared to rubber.

Author:	Jopapa [ Tue Apr 24, 2007 5:28 pm ]
Post subject:	Changing motor mount bushings
The bushings in my '74 Duster's motor mounts are completely shot, so I ordered a new pair of Anchor bushings. Looks like it'll be pretty easy to replace the driver's side bushing, but upon closer inspection, the passenger side looks like it's going to pose a challenge. Would it be easier for me to get the car up on a frame lift and support the engine so I can change the bushing from underneath, or would I still be better off by using an engine hoist to hold the engine and tackle the mount from above? I'm thinking the frame lift idea might be best, but I'd like to hear from those of you who've changed your mounts before.

Author:	SlantSixDan [ Tue Apr 24, 2007 6:51 pm ]
Post subject:	Re: Changing motor mount bushings
Quote: The bushings in my '74 Duster's motor mounts are completely shot, so I ordered a new pair of Anchor bushings. Not what you asked, but for the trouble you're about to go to, you'd do well to get better new bushings than that 3rd-world compressed-cow-dung junk from Anchor...

Author:	Jopapa [ Tue Apr 24, 2007 7:00 pm ]
Post subject:	Re: Changing motor mount bushings
Quote: Quote: The bushings in my '74 Duster's motor mounts are completely shot, so I ordered a new pair of Anchor bushings. Not what you asked, but for the trouble you're about to go to, you'd do well to get better new bushings than that 3rd-world compressed-cow-dung junk from Anchor... Recommendations? These were cheap so I ain't afraid to just chuck 'em. They were what was readily available when I got 'em...

Author:	SlantSixDan [ Tue Apr 24, 2007 7:28 pm ]
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These urethane ones. They don't mention the slant-6, but the same insert is used in all the '73-up spool-type engine mounts. If you're after a urethane trans mount for your '74, it's this one.

Author:	Jopapa [ Tue Apr 24, 2007 8:36 pm ]
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Quote: These urethane ones. They don't mention the slant-6, but the same insert is used in all the '73-up spool-type engine mounts. If you're after a urethane trans mount for your '74, it's this one. WHOA NO WAY! I never knew there were urethane versions of the spool type bushings. Very cool. I had planned on using a poly transmission mount and just OEM bushings. One question though: how much engine vibration is felt when using the poly bushings Vs. OEM rubber ones?

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Author:	SlantSixDan [ Tue Apr 24, 2007 9:05 pm ]
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I don't think you'll experience any level of engine vibration sufficient to cause annoyance.

Author:	Jopapa [ Tue Apr 24, 2007 9:14 pm ]
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Quote: I don't think you'll experience any level of engine vibration sufficient to cause annoyance. Groovy. I'll order those babies this weekend. Yer the man

Author:	slantzilla [ Tue Apr 24, 2007 9:19 pm ]
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I put a poly trans mount in my Duster and it increased the level of vibration in the car a bunch.

Author:	Jopapa [ Tue Apr 24, 2007 9:22 pm ]
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Quote: I put a poly trans mount in my Duster and it increased the level of vibration in the car a bunch. No kiddin huh? So which do you think would be the better use of poly: the engine mounts or the tranny? I'd like to have a smooth, comfortable ride (think long range highway driving, which is why I'm planning to install an OD 4-spd) with minimum vibration.

Author:	slantzilla [ Tue Apr 24, 2007 10:25 pm ]
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Personally I'd stick with a rubber trans mount, especially with a stick. Not sure about poly motor mounts, but my solids sure transfer vibration.

Author:	Jopapa [ Wed Apr 25, 2007 7:00 am ]
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Quote: Personally I'd stick with a rubber trans mount, especially with a stick. Not sure about poly motor mounts, but my solids sure transfer vibration. Yeah I would expect you'd get a LOT out of the solid ones. Methinks I'll go for poly engine mounts and a rubber trany mount. Now back to my original question; how can I best get to that passenger side mount?

Author:	Aggressive Ted [ Wed Apr 25, 2007 8:19 am ]
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I have the poly bushings too, massive vibration compared to rubber. I wouldn't recommend it for a daily driver. A race car, ok. Everytime I stop at a light or in freeway traffic the windows and dash rattles. I have a mild cam too! Stay with the rubber!

Author:	SlantSixDan [ Wed Apr 25, 2007 9:01 am ]
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Quote: I put a poly trans mount in my Duster and it increased the level of vibration in the car a bunch. I put one in my Dart and one in my truck and noticed zero increase in perceptible vibration. Not saying your experience didn't happen (obviously it did) but I'm wondering if there might be other factors at work in your case. Maybe the softer original trans mount was masking excessive vibration due to some other cause, which you can now feel with the poly mount. Maybe other mounts (i.e., engine mounts) have softened to the point where they're permitting the engine to shake around too much, increasing the vibration, which is now transmitted to the car via the unsagged poly trans mount.

Author:	SlantSixDan [ Wed Apr 25, 2007 9:06 am ]
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Quote: I have the poly bushings too, massive vibration compared to rubber. Well, I'll certainly defer to your experience with polyurethane in the spool-type mounts; I haven't got any vehicles with spool-type mounts right now, just the sandwich-type mounts used through '72 (and also used in my '89 truck). The sandwich-type mounts by design allow more engine wiggle than the spool types, so I guess there's more leeway for stiffening up the compound of which they're made. But I have used the spool-type trans mounts and not picked up any increased vibration...

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Author:	Aggressive Ted [ Wed Apr 25, 2007 10:03 am ]
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I also changed the transmission and motor mounts to be sure everything is equal. It was worse with out the new transmission mount. My engine is balanced and runs very smooth, however, at idle under load in gear, at 600 rpm it does send a very strong vibration through out the car. At higher rpms, above 600 it is not noticeable. I attribute the vibration to the higher compression ratio, higher lift cam and the harder poly mounts. The old soft rubber ones were great, they soaked up all the vibrations. The poly mounts are just a different feel.