Engine Mount: Three Bolt or Four?

[insite]

i've got to replace my motor mount. it's a three bolt type. i have access to a great deal on a four bolt type. i can't remember if a four-bolt will fit on a three bolt car or if a three-bolt mount will fit on a four bolt car.

does anyone know if i can replace my 3-bolt mount with a 4-bolt mount? thanks.

[kt1]

Hello,

I recently had vibrations and took out my motor mount to find the rubber cracked and shifted 5 mm to the right. I went to the dealer and told the parts dealer my model & year. They pulled up the part number and sold me the part with the 4-bolt assembly and my stock one was 3 bolt. The 4 bolt fit up fine, I only used 3 bolts on the new assembly because I do not have the threading for the 4th bolt and driven for about 100 miles now smooth as ever. I also noticed that the assembly metal and build quality on the new mount was considerably stiffer than the old one (not stiffer for driving, it was as smooth as off the factory floor).


Here's a pic I snapped before installing the new mount - old mount (left) and new mount (right).





It was fine for me, no installation issues or problems with the fourth hole. If you notice the fourth hole is for the upper right of the mount. It clears everything for me in the pulley area.

[insite]

you are the man. thanks for the input!

[smagerstein]

Hi


Seems I have the same vibration prob that u had.

What did u pay for the part if I can ask?

Steven.

[MNBoxster]

Hi,

If your car came as a 3-bolt unit, this is what you should replace it with. Using a 4-bolt mount means that one side is not secured and this could cause issures such as the mount failing prematurely...

Happy Motoring!... Jim'99

[insite]

MNBoxster -

thanks for the concern; i agree this COULD pose a problem. i've seen the mounts side by side, though, and i don't think it will make a difference.

smagerstein -

i purchased the part from German Auto Dismantlers for $85. since it's used, i'm going to modify it with a pass-through bolt to prevent lateral bushing slippage. i'm then going to fill it with Flexane 80 (pourable urethane) to make sure it doesn't go out again. BTW, if you call german auto dismantlers, mention you're a PCA member.