XJ40 ( XJ81 ) 1986 - 1994

XJ81 Hydraulic Front Engine Mountings

 
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Old 04-26-2019, 04:37 AM
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Default XJ81 Hydraulic Front Engine Mountings

I need to change these on my car as the engine dips down under braking.
I assume they are not repairable??
It became apparent as alternator belt tension bracket hits the anti-roll bar under braking.
Also the fan catches the the shroud/air duct.

Has anyone changed these?
There appear to be two studs at the top which may mean lowering the subframe to allow removal.
There also seems to be a Torx bolt accessible from below the subframe.

Any tips welcome including the cheapest source of new ones in the UK.

Thanks

Charlie
 
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Old 04-26-2019, 10:18 AM
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I know very little (next to nothing) about the two 12 cylinder front engine mounts but the single rear one I believe is the same on the 6 cylinder.

If that one (the 'transmission' mount) is broken or has worn out springs/bushes it will allow the engine to move excessively.

I have heard that if it does move that much, the fan CAN contact the shroud ..maybe it's worth a check?

Larry
 
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Old 04-26-2019, 11:59 AM
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Default XJ81 motor mounts

The last time I replaced the motor mounts on my 1994 XJ12 a few years ago I was told by the US Jaguar wholesale place that I might have gotten the last two available mounts as they were no longer being produced.
 
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Old 04-26-2019, 01:55 PM
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The front mounts on the V12 are very special and have a hydraulic element to them and they collapse. Looking at another posting on here by HarpersMuse who has done a wonderful job resurrecting an XJ81 the photos on his post show a new mount with an old one and there is at least 1.25" difference in height!
I have been offered a second hand pair but all the challenges involved in changing them and the fact the failure is probably age rather than mileage related new ones is probably the only option. Cost hurts badly though!

I will check the rear transmission mount too as I changed that on my V12 X300/305 as it caused a rattle. I have now sold that one.
Regards
Charlie
 
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Old 05-01-2019, 04:47 PM
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Iím dealing with rear engine/transmission mount rebuild now on my 1996 XJ12. The front mounts IIRC are the same for the XJ81, but last time I checked Jaguar Heritage Parts, they were listing for something like $600+ each.

Nick
 
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Old 05-02-2019, 07:22 AM
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Originally Posted by NTL1991 View Post
I’m dealing with rear engine/transmission mount rebuild now on my 1996 XJ12. The front mounts IIRC are the same for the XJ81, but last time I checked Jaguar Heritage Parts, they were listing for something like $600+ each.

Nick
That's crazy

.... I wonder if one could make a new mount out of poured/cured rubber and studs/sockets like a standard motor mount versus the complex hydraulic OEM solution? Or perhaps one could modify another XJ40 mount to fit?


It may not be as uber-isolating as the OEM mount, but it could work.
 
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Old 05-03-2019, 07:25 AM
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So Iíll correct the record with current information.

Jaguar part MMD7500AA covers the XJ81 and X305. Currently 355 Euros or about $400 USD each at current exchange rates. Still available.

Iíd imagine the hydraulic/rubber elements could possibly be rebuild by a competent shop?

-Nick
 
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Old 05-03-2019, 09:28 AM
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Originally Posted by al_roethlisberger View Post

.... I wonder if one could make a new mount out of poured/cured rubber and studs/sockets like a standard motor mount versus the complex hydraulic OEM solution?

It may not be as uber-isolating as the OEM mount, but it could work.
I know people who have poured their own motor mounts from polyurethane, took a while to set up but worked well.(and was certainly more affordable!!)

Larry
 
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Old 05-16-2019, 03:34 PM
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Thanks for all the replies. I have changed the front mounts today. It took 7 hours. Even with a two post lift and a proper engine support beam they are a real fiddle to change but it can be done without dropping the subframe. The drivers side on a UK car is much more difficult as you have the alternator, steering column and the power steering pipes to contend with. Getting the old mounts out was relatively easy as they were both in two pieces so needed changing anyway. Getting the new ones in was very tricky. Much altering of the lifting beam needed. Oh and before you start you have to remove the heat shields which are on two 5 mm studs. They have been refitted fully polished to help reflect the heat away. The difficult side I managed to refit without removing the alternator but detached the power steering pipe bracket held on my two of the 8 mm sump retaining bolts. As I say very tricky and lots of skin abrasions to show for it. No room for long sleeves or gloves!

Ok so engine mounts replaced. Gearbox rear mount parts on order to be with me tomorrow as the yellow sponge bit had disintegrated. As of now there is still a clonk under braking and I think changing the gearbox mount may help but I suspect there is another problem still yet to be found. I will update when I have the final solution.
 
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