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Motor mount replacement
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Posted 4/25/2020 5:09 PM
G4me
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Date registered: Jan 2012
Location: Honolulu, HI
Vehicle(s): 2002 G500, FJZ80 LandCruiser
Posts: 111
100
Motor mount replacement

My motor mount on my 2002 G500is worn caused the engine to lift under acceleration (tested in parking lot with brakes applied etc.) I crawled under truck today and rather than remove exhaust manifolds etc. as per WIS it looks like I can support the engine and remove the motor mount and the aluminum arm that bolts to the block as one unit. It looks like I will be able to wiggle it out between motor and frame rail then replace on bench and reinstall. Has anyone tried this method? see attached for aluminum arm I am referencing.

Thank G4me



(Engine mount.jpg)



Attachments
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Attachments Engine mount.jpg (21KB - 2 downloads)
#241662
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Posted 4/26/2020 1:39 AM
Otiswesty
Administrator




Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3002
2000
Re: Motor mount replacement

Usually, it is the rubber mount #5 that goes bad
#241663 - in reply to #241662
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Posted 4/26/2020 4:20 PM
Inkblotz
Expert




Date registered: Apr 2006
Location: Georgia
Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo
Posts: 3184
2000
Re: Motor mount replacement

Don't know about a G500 but on all the diesel G's I will use a block of wood on top of a jack positioned under the oil pan. Remove the top bolt of each motor mount. Jack the motor up keeping an eye on the end of the motor/trans bell housing as it get jacked up towards the fire wall (remember you only need to clear the top bolt of the motor mount) Then remove the 2 bolts under the mount and wiggle it out. Install is reverse procedure. Be sure to put #68 back in place as well.
#241664 - in reply to #241662
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Posted 4/27/2020 12:33 AM
Otiswesty
Administrator




Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3002
2000
Re: Motor mount replacement

Be sure to inspect it well. Rereading your initial post, there may be nothing wrong with your G. Many shops would be happy to sell you a $1200 repair tho.
#241665 - in reply to #241664
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Posted 4/27/2020 1:19 PM
G4me
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Date registered: Jan 2012
Location: Honolulu, HI
Vehicle(s): 2002 G500, FJZ80 LandCruiser
Posts: 111
100
RE: Motor mount replacement

Guys,

Thanks for replies. My initial concern was all the removal parts and pieces from the top to be able to get to the top bolt of the motor mount under the exhaust manifold. In the end, I just followed the WIS procedure. I would like to know if there are any tips or tricks for removing and replacing the nuts on the studs on the underside of exhaust manifold. I ended up laying on my back with a 10mm open wrench as that is all the would fit on some. Surely not what Hans and Franzs had in mind when they designed it. Other than pretty straight forward just time consuming.

Lesson learned. The WIS does not direct at what stage to remove exhaust manifold. It only directs to remove front exhaust pipe in step 23. which per the picture it is the down pipe from the exhaust manifold. I loosened the exhaust manifold after removing coil packs since I was in the area. If I ever have to do it again I would loosen and remove the exhaust pipe and then go forward and remove the exhaust manifold. I cannot see how you could complete the job without removing the exhaust manifold?

Otiswesty - The dealer indicated worn or loose motor mount during a previous inspection. I did inspect myself and the motor was lifting up on the drivers side when it was revved by 1-2 inches. Enough movement to cause concern or do all 463s do this? Upon inspecting the mount on the bench it does not visually appear worn and it certainly was not loose. I needed a breaker bar and 3 foot pipe to break the top nut loose.

I still need to complete the visual inspection with motor running and see if it is still lifting/moving under acceleration.

G4me
#241666 - in reply to #241662
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Posted 4/27/2020 7:50 PM
paulunm
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Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 124
100
Re: Motor mount replacement

If it's lifting under acceleration and one side of the motor lifts when you rev in gear with the car stopped and brakes applied- it's gotta be the mount. I have video if you want to see my failed mount test.

I had a shop do mine, and based on what they charged I don't think they had to remove any exhaust parts. A Mercedes indy shop should be well versed in this.
#241667 - in reply to #241662
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Posted 4/21/2022 1:33 PM
Desert Fox
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Date registered: May 2013
Location: Tucson, Arizona
Vehicle(s): G500 2002
Posts: 191
100
Re: Motor mount replacement

My 2002 G has apx 125k miles on it. Noticed vibrations when driving up some highway mountain passes the other day. Did a motor mount test--Here is the video:

https://photos.app.goo.gl/zc1A3HQQTEb1sn1y8

Looks abnormal to me, but what do I know? Opinions please.

1. Also, how many motor mounts are there?
2. Any thoughts about replacing transmission mount, too?

Thank you.

Edited by Desert Fox 4/21/2022 1:44 PM
#243546 - in reply to #241662
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Posted 4/22/2022 7:46 PM
Otiswesty
Administrator




Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3002
2000
RE: Motor mount replacement

If you get under the car you should be able to see if the mounts are bad with the rubber separated from the metal core. There are main trapezoidal mounts to either side of the engine.
I think the mount #26 is on the back of the trans, but not completely sure.



(Mounts.jpg)



Attachments
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Attachments Mounts.jpg (75KB - 2 downloads)
#243551 - in reply to #241662
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Posted 4/23/2022 5:09 PM
paulunm
Veteran


Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 124
100
Re: Motor mount replacement

Desert Fox - 4/21/2022 10:33 AM

My 2002 G has apx 125k miles on it. Noticed vibrations when driving up some highway mountain passes the other day. Did a motor mount test--Here is the video:

https://photos.app.goo.gl/zc1A3HQQTEb1sn1y8

Looks abnormal to me, but what do I know? Opinions please.

1. Also, how many motor mounts are there?
2. Any thoughts about replacing transmission mount, too?

Thank you.


This video does not look like one of your motor mounts has completely failed/torn. The motor will jump up much higher than that when the mount is split.

Now, your mount could be collapsed. But, I don't know that assuming your vibration issues are due to motor mounts is the right conclusion. Tire balance, center shaft failure, tie rod worn- those would be where I'd look first.

Motor, trans, t-case mounts do contribute to vibrations I've been told- but I've not experienced vibes due to these myself.
#243552 - in reply to #243546
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Posted 4/23/2022 11:08 PM
Desert Fox
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Date registered: May 2013
Location: Tucson, Arizona
Vehicle(s): G500 2002
Posts: 191
100
Re: Motor mount replacement

Thanks Otiswesty and Pulunm for your input! I'm going to crawl around underneath, tomorrow, with a flashlight.
#243553 - in reply to #243552
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