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Jaguar XJ-S Front Subframe Forward Mount Bushings

FRONT SUBFRAME FORWARD MOUNT BUSHINGS


Yeah, that sounds redundant, but we're talking about the bushings at the forward end of the front subframe.  There's another pair of mounts at the rear end of the front subframe, and of course there's another sent of mounts for the rear subframe.  All these others are called "mounts" because they are bracket-shaped, but these front subframe forward mounts are called bushings because they happen to be round.

The front subframe forward mount bushings for the coupe are part number C30314.  Daniel Cusick sent these pics:

Front Subframe Forward Mount Bushing - Side View

Front Subframe Forward Mount Bushing - Top View

This bushing appears to be in good condition.  When these bushings have failed, there are usually tears visible in the rubber.  There may even be chunks missing.  On Kirby Palm's '83, a mount with torn rubber caused a loud clicking sound when first starting to move in reverse gear.  It didn't sound like rubber at all, it sounded like a metallic click.

The bushings for the convertible are part number CBC5736.  The difference appears to be in the length of the steel sleeve in the center of the bushing.  Cusick reports that the sleeve protrudes 1/4" on one side and 3/8" on the other side on the coupe bushing shown above.  Todd Repass sent this photo of a bushing from a convertible:

Front Subframe Forward Mount Bushing - Convertible

On this bushing the center sleeve protrudes about 3/8" on one side but only 1/8" on the other.

There are aftermarket poly bushings available, such as the set from Motorcars Ltd:

Poly Front Subframe Bushings

These bushings appear to be cleverly designed to replace the C30314 items.  Where the OEM bushing has a metal sleeve around the circumference where it is clamped securely in place so it cannot move, these bushings have lips on either side that surround the clamp to locate them securely.  They are also bulged in the center so that they fill the space allotted and cannot slide back and forth on the mounting bolt.  If the openings where these bushings are installed is different between the coupe and convertible, they might not fit snugly in some installations.  Be aware that such bushings must fit snugly; if installation leaves a gap on one side, you need to fill that gap with something to locate the bushing securely.  Anything washer-shaped with a hole the same size as the hole in the bushing should do it, although plastic would be less likely to cause a rattle than metal.

 

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