Engine Mount Replacement Problem E430 - Mercedes-Benz Forum
 
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#1 (permalink) Old 11-06-2007, 07:42 PM
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Engine Mount Replacement Problem E430

I have just tried to replace the worn engine mounts in my 99 E430. I followed the DIY posts, I managed to get the mounting bolts out and then tried to lift the engine from the pan (with wood) and it would not go up. Instead when I jacked up on the engine the whole car started to rise, the mounts would not come free. I did not want to put too much pressure on the jack in case they finally did let go and suddenly lift the engine too far up and hurt something. I put the bolts back before I broke something and now I'm asking if anyone knows a secret way to release the mounts? Are they just stuck and need a good whacking? Should I put the bolts back in halfway ( to prevent uncontrolled movement) and then jack up till I get the car off the ramps? Mileage is 150k.
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#2 (permalink) Old 11-07-2007, 01:12 PM
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Don't know what to tell you. When I did mine the mounts came loose no problem and the engine lifted up on a jack real easy without lifting the car. Are you absolutely sure you removed the right bolts? Can you see the engine hanging up on anything else besides the engine mounts? Is your hood open or is the engine hitting on the hood? Is your car really rusty or dirty around the engine mounts? It seems weird that they would be that stuck. It would seem at least one end of each mount would be loose enough to allow the engine to start lifting.

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#3 (permalink) Old 11-07-2007, 01:23 PM
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Hey, jkm, welcome to the forum. Please take a moment to update your BW profile re: vehicle and location, that can prove to be useful.

I've yet to do my motor mounts on the 210, but on other cars (well, at least the first time I did a motor mount) I was surprised how far I had to lift the jack before the pressure came off of the mounts. Purely from a safety standpoint I've always done them one side at a time so long as clearance permitted, so I'd say pull the bolts on one side, keep them half-loose on the other and then focus more jack pressure on the loose side (hope that makes sense).

Of course if what you're meaning is that you had raised the car so far that the tires were off the ground, then yes, you have a significant issue. But I really suspect you're just surprised how high it's getting without the engine moving. Remember that the front suspension will rise pretty until it is nearly fully expanded, because normally it's carrying all of the weight of the engine and transmission assembly which greatly exceeds the rest of the front of the car. Once you finally start lifting the engine then you'll still have a ways to go before you can get the mounts out.

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#4 (permalink) Old 11-07-2007, 06:40 PM
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Engine Mount Replacement Problem E430

Thanks for the quick reply guys. I have looked at all the obvious things you pointed out. I think that Greg has the answer. I expected the engine to rise immediatly as I started jacking. I didn't realize that as the weight of the engine was taken off front end, it would rise up on its springs. I thought that I was lifting the whole car when the chassis started to rise with the engine. I whimped out at the jack. I'll follow up on Sat after a MORE vigorous jacking attempt (with the bolts half in).
Jason
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#5 (permalink) Old 11-07-2007, 07:42 PM
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Take gregs210 suggestion of doing one mount at a time. Move the jack toward the mount that you are removing to get better leverage. The engine will move up and may start to lift the wheel on that side. However, the other side will be more or less stationary. Expect to move the engine up at least three inches. You will need extra room to move the new mount into place. Good luck.
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#6 (permalink) Old 11-08-2007, 02:18 PM
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I done the engine mounts on my E430 about a month ago (with only 80,000km on the clock), The job took about an hour to do, just make sure you remove the upper fan moulding on the radiator, because as you jack the engine up the fan will hit it.
The rest is very simple and just do one side at a time, the new mounts is about an inch higher than the old one. So jack engine up more to fit.
Other thing to watch out for is if the old mounts are "very broken" oil will come out of it when you pull it out. (yes I got wet).
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#7 (permalink) Old 11-11-2007, 11:27 AM
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Engine Mount Replacement Problem E430

Here is a follow up if anyone is interested. The problem was in the way I got the car of the ground. the first time I used ramps, so the springs were compressed and when I tried to jack the loose engine up the suspension came up with it and it looked like I was jacking up the whole car. This time I put the car up on jack stands from the frame. The suspension was extended all the way. This time when I jacked the engine it came right up. Job was done a hour later. Great results, lots of various noises are gone. Thanks for the help.
Jason
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#8 (permalink) Old 11-11-2007, 05:36 PM
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For those that have ramps and want to do the replacement using them do them one at a time. Place the jack closest to the mount that is to be removed. That side of the body will lift but not so much that you cannot remove the mount.
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