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Been experiencing some decelerating vibration lately and reviewed a number of posts/articles on motor mounts and many people talking about how theirs were collapsed. I have yet to find a good way to determine if and when a motor mount is collapsed.
I found the HD M-1324 service manual and checked the gap on mine and it is close to zero if any and nowhere in the 20-40 range that it recommends. Before taking it out and starting to file it down I want to make sure it is still good.
Here is a picture of it from the side. Wondering if the rubber isolator should be visible above the side plate as we see here.
It's bad. The gap doesn't go away because the mount expands; it goes away because the mount sags.
Filing it down just allows it to sag more before it makes contact and transmits more vibration.
Since the mount is on an angle, as it sags the engine also shifts to the rear, so expect the rear mount to be stretched aft. It may accelerate the failure of your new front mount.
It's bad. The gap doesn't go away because the mount expands; it goes away because the mount sags.
Filing it down just allows it to sag more before it makes contact and transmits more vibration.
Since the mount is on an angle, as it sags the engine also shifts to the rear, so expect the rear mount to be stretched aft. It may accelerate the failure of your new front mount.
Thanks for the great info.
So if I hear you right, the front one is gone and it has more than likely affected the rear one as well.
I took a shot from just behind the transmission, does it shows if that needs to be replaced as well.
I went with the Predator front mount. It eliminates the rearward shifting tendency. I used a factory rear mount and a Sputhe rear stabilizer. No complaints.
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How to inspect front motor mount
