As per title really,

I am about to drop the frame to replace the bushes as they are shot, but there seems to be mixed opinion on whether they should just be pressed in, or, as jtis says glued with epoxy.

 

Hi puddled,

I can't imagine needing to use epoxy. It takes a significant amount of force to press them into the bores of the subframe, even if you put the bushes in the freezer for a while to contract their steel cores and use soapy water to lubricate the rubber during pressing. I've replaced the OE bushings on both of ou XJ40s and they were not glued in.

I'll be curious to hear from anyone with a different view.

Cheers,

Don

 

The specific instructions in JTIS are:

Plus cure time before installation of 30 minutes. Full cure time is 3 days.
So if you have the time, that would be best.

If using the epoxy, you'll need to be ready to work quickly. You only have about 5 minutes.

Here is a web page that discusses the reason for using the epoxy as related to
the XJ40, which probably resulted in a running change to newer models:

http://www.justanswer.com/jaguar/3u9...on-clunks.html

There is apparently a TSB covering the problem, although most of the TSB is quoted
in the above link.

It's worth noting that the X308/R version of the bush is considered a handling upgrade
for XJ40 and up since it is the least compliant of all the versions. It has 3 voids as
compared to the 4 voids of other versions.

My plan for the rear rebuild is the XJR bushings, epoxied ... and voids filled with
casting urethane having a hardness of Shore 80A.

Bear in mind that your entire rear suspension is mounted at only four points. The two
bushings and the monostrut. The monostrut has a further two points of flex at the
body side of the monostrut.

These four points have the responsibility of locating your rear suspension in all
three axes.

Some interesting observations from a couple of UK Jag mechanics:

http://www.pistonheads.com/gassing/topic.asp?t=1185957



++

 

I spotted about the xj40's using them as upgrades, but a lot of them just seem to press them in and do without the epoxy.

 

plums,

That's a great tip! Are there any risks of increased diff gear noise being transmitted into the passenger compartment due to the lower compliance of the bush? If not, it sounds like something every XJ40/X300/X308 owner should consider when it comes time to replace the bushes.

Thanks!

Don

 

My guess would be that it is acceptable.

After all, the XJR left the factory with them obstensibly meeting
NVH requirements of Jaguar, and there aren't howls of protest in
the X308 from owners.

The second upgrade for XJ40 and early X300 owners would be
the monostrut. It combines the two dogbones into one structure
so that the four bushes remain in the same position relative to
each other. I believe the monostrut is used on all versions of
the X308, so relatively easy to obtain.

Both of these modifications were found on the XJ40.com site.