[xj40] Engine mounts

Rubber tends to go soft or hard with age according to its
additives. I wonder if the rubber mounts for the 3.6 engine on
a '89 Daimler become harder with age. I can certainly feel engine
vibration in the cabin. Was there a revised engine mount
introduced aroung 1990?

Any experience?

Regards,

Peter Parsons, Cornwall, UK.–
peter Parsons
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In reply to a message from peter Parsons sent Tue 18 Dec 2012:

Peter,

I don’t see a difference in the LH rubber mount (CBC12916)
between model years but it would seem that under that part
number it is no longer supplied so perhaps they have one
from a later model which can be used although they do not
list it as a superseding part in the JDHT catalogue so you
would need to talk to JDHT.

http://www.jaguarclassicparts.com/uk/jaguar-xj6-parts/engine/engine-and-gearbox-mounting/engine-mounting-front-xj6

The RH rubber mount (CBC244813) has been superseded by a
rubber MHC7522AA plus its mounting MMB7520BA which appear to
be from the V12 motors.

http://www.jaguarclassicparts.com/uk/partsearch/?q=MHC7522AA--
The original message included these comments:

Rubber tends to go soft or hard with age according to its
additives. I wonder if the rubber mounts for the 3.6 engine on
a '89 Daimler become harder with age. I can certainly feel engine
vibration in the cabin. Was there a revised engine mount
introduced aroung 1990?


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from Bryan N sent Tue 18 Dec 2012:

Peter & Bryan,

When I did all the front-end rubber in our car a few months
ago my Jaguar specialist parts supplier checked with Jaguar
directly and was told that they now use the same part number
for both the left and right side engine mounts. In the
archives I found posts from others who had been given the
same information. The answer may be different for a 3.6L
car. See my photo album on engine mount comparison to see
what the old and new mounts looked like, and the adjustment
I made with the fiber washers so that the heights of the new
mount/washer assemblies would match the heights of the
original ones.

Don–
The original message included these comments:

I don’t see a difference in the LH rubber mount (CBC12916)
between model years but it would seem that under that part
number it is no longer supplied so perhaps they have one
from a later model which can be used although they do not
list it as a superseding part in the JDHT catalogue so you
would need to talk to JDHT.


Don B : '93 VDP Flamenco Red 187K : (ex-'88 Sovereign)
Franklin, TN, United States
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In reply to a message from peter Parsons sent Tue 18 Dec 2012:

When I was researching the archives about engine mounts I did see a
Jag TSB about engine vibration-don’t remember what years it
included- and a revised softer mount to eliminate the problem.So
the engineers were aware of the problem. Of course those are
discontinued so the only choice is aftermarket. The new mounts I
installed give a slight vibration on cold start until the engine
warms up. Don B did say when he installed his there was less
vibration so it may depend on the aftermarket brand that you
pick.And you may want to check the vee mounts to see what condition
they are in. Replacing them made a big inprovement in reducing
vibration also. Cary–
The original message included these comments:

additives. I wonder if the rubber mounts for the 3.6 engine on
a '89 Daimler become harder with age. I can certainly feel engine
vibration in the cabin. Was there a revised engine mount
introduced aroung 1990?


94 XJ6
kingsville/ohio, United States
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In reply to a message from 72bird sent Tue 18 Dec 2012:

Good point Cary.

I replaced my engine mounts and vee mounts at the same time
and still haven’t noticed any new vibration on cold starts.
I don’t know if changing only the engine mounts might have
contributed to the slight vibration on cold start that you
experienced.

Don–
The original message included these comments:

When I was researching the archives about engine mounts I did see a
Jag TSB about engine vibration-don’t remember what years it
included- and a revised softer mount to eliminate the problem.So
the engineers were aware of the problem. Of course those are
discontinued so the only choice is aftermarket. The new mounts I
installed give a slight vibration on cold start until the engine
warms up. Don B did say when he installed his there was less
vibration so it may depend on the aftermarket brand that you
pick.And you may want to check the vee mounts to see what condition
they are in. Replacing them made a big inprovement in reducing
vibration also. Cary


Don B : '93 VDP Flamenco Red 187K : (ex-'88 Sovereign)
Franklin, TN, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Will be It possible to have all codes for my Daimler 3.6 1987? I want change all engine mounts…

Peter …

You said you can certainly feel engine vibration in the cabin.

Remember that the engine AND transmission being bolted together are really one big chunk of metal held in the car at only three places.

The two front engine mounts are very simple and straightforward. Basically if they are not coming apart, they’re good. The transmission mount is a whole different animal. Lots of parts, springs and
bushings. If I was troubleshooting engine vibration that’s where I would look first.

1 Like

Groove…if you have time… could you give me all numbers of these parts? All but all for all… I’d like change their.

Max … here’s a breakdown of the assembly.

To get the individual part numbers go to …

jaguarlandroverclassicparts.com (you’ll have to type it in your search engine. For some reason it won’t hyperlink from here)… select your car model … go to engine … go to engine and gearbox mounting.

Groove this is the mount for transmission…true?..and there are 2 of that mounts for engine…I change all three and I’m ready…there are some good brand for their? :grin:
Thanks for all your time…

Max …

As I mentioned there are only three points holding the engine/transmission in the car.

The two in the front are a very simple “pancake” design. Nothing elegant just a round slab of moulded rubber …

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The third mount is at the rear of the transmission and as the diagram I sent in the previous post shows very complicated.

Yes there were revised softer engine mounts introduced by a TSB sometime around 1991. I had them fitted to my 1990 4.0 XJ6 back in the day but really never noticed any difference.

Buy Is there someone sailing all this part assembled? I’d like to change all…

https://parts.jaguarlandroverclassic.com/parts/index/part/id/C01.893.89312.89312213.893122135717/brand/jaguar/

Max …

I think the only way you’ll be able to get the whole transmission mount assembly would be from a donor car.

But unless the “hard” parts have somehow been damaged in an accident you only need to replace the two springs #4 & 12, the foam buffer #7, and the two rubber isolating spring seats #11 & 3 and your assembly will be better than new. All these parts are readily available from online vendors.

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