I replaced my engine mounts and engine shocks today, as well as the transmission mount and differential mount.

The latter two were definitely in need of replacement, and I replaced the other stuff at the same time since the car shook more than it seemed it should, and I had no idea when they were last replaced. Once out, the old engine mounts looked fairly old and worn out, but not terrible (like my nearly shredded transmission mount).

The car now starts smoother than it did before (less shaking), and when I'm driving it it feels smoother than before also. HOWEVER, it seems to shake three times as much as it did before at idle, and when shutting it off the car shakes back and forth enough to make me think it's trying to flip itself over!

Why is it worse now than before? Any ideas??

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

When is the last time u adjusted the valves ? Check ur vacuum lines (any got loose) , replace the rubber connectors.

There is a rack pin on the Injection Pump. U may have to adjust that or replace it with the new kind.

Good Luck

Is this on the TD - maybe a vac leak to the engine shut off valve?

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00 E420
98 E300 DT
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97 S500
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86 Holden Jackaroo Turbo D
86 300SDL
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Valves were adjusted 5,000 miles ago. Vacuum the shutoff valve is fine; I can't imagine that would affect the shaking during idle anyway.

Could the rack damper pin really be the cause of the problem? The only thing different between now and yesterday are the mounts and shocks, and it was shaking much less at idle yesterday. The rack damper pin hasn't been touched. How can I tell if I have the old or new kind? How is it adjusted?

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

Is it possible that the old engine mounts/shocks were worn to the point that they more freely let the engine move w/o moving the rest of the car at idle? Now with new firm mounts, the vibration is transferred to the rest of the car...more?
Just a guess.

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Chris
1985 300SD - 'Grace' (198K mi.)
2018 Honda Civic Sport
2018 Honda CRV LX
2010 Honda Fit Sport (RIP)
2013 Honda Accord Sport (Sold)
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)

Some mounts need to be measured and adjusted.... did you do a search on the mounts ?