XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

V12 engine mount replacement.

Old Dec 3, 2018 | 02:22 PM
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Nic Graves's Avatar
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Default V12 engine mount replacement.

Hi I have a broken engine mount, I am going to replace both sides. What is the best / easiest way to take the weight off the mounts? Is it possible to jack it up from underneath? If so what’s the safest spot?

Thanks in advance!

Nic

nz
 
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Old Dec 3, 2018 | 06:18 PM
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When I have done them:

Heavy lump of softish wood against the part of the upper sump that protrudes past the front of the suspension cradle. FIDDLY, hell yes, but works.

IF, and I mean IF you still have the engine driven fan, oops, it will clash with the shroud as you raise that engine, and that engine needs to raise a good 6" to clear the studs on the mounts. I run Efans on all of them, so no issues at all.

The heater water tap, at the rear of the engine bay MAY get contact, so watch out.

Other items might get caught, make contact, etc, so watch carefully as you raise the beast.

Not a fun task whichever way anyone looks at it.
 
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Old Dec 3, 2018 | 08:51 PM
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Cheers Grant, yes I am running electric fans, thanks for your advise with regards to installing them, the car is running great. Excellent I was hoping for a solution like that, so I assume I can leave all hoses connected? ill get into it this weekend and I’ll keep you posted.
 
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Old Dec 4, 2018 | 12:37 AM
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Just a reminder, you must undo the nut on the engine mount stud before you jack up the engine. A 9/16ths ratchet spanner is the best tool to use. Removing the air box trumpet cover gives just enough access. The nut that fixes the top stud on 9 to the bracket on the engine.
 
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Old Dec 4, 2018 | 01:08 AM
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Thanks Greg I removed the nuts yesturday, that’s a great diagram, im hoping my fibre washers are in ok condition as my new mounts did not come with them.
 
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Old Dec 4, 2018 | 02:13 AM
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Originally Posted by Nic Graves
Thanks Greg I removed the nuts yesturday, that’s a great diagram, im hoping my fibre washers are in ok condition as my new mounts did not come with them.
The fibre washers do not matter, IMO. Most people leave them out if they are not there, but usually they are Ok when you get them off. Good luck
Greg
 
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Old Dec 4, 2018 | 02:36 AM
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I leave them out, less weight, more speed, whoopee.
 
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Old Dec 4, 2018 | 07:50 AM
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Dont leave out the fiber washer. They minimize the heat transfer from from the mount to the rubber and thats the reason the first mount lasted as long as it did.

While at this... I'd support the motor from the top and drop the front subframe enough to get at the the rearward subframe mounts and rack bushes. If those are OE, then after servicing it would be a different car.
 
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Old Dec 6, 2018 | 05:42 PM
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Good advice thanks I will leave them in if they are ok. My subframe has newish bushes.
 
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Old Dec 16, 2018 | 12:11 AM
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Mission accomplished, cheers for the advice guys.
 
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