I've noticed that I'm getting a lot of vibration during idle. The engine is running smoothly and I had the motor mounts replaced about 4 years ago. They seem to be ok. Is there something else I should check? Thanks.

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85 300TDT 456,000 orig. miles

the obvious things are

1. mounts - some of the aftermarket mounts don't last that long. 4 years, it might be time for new ones.

2. Injectors - when last did you replace or rebalance them?

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles

could be your engine vibrating..

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

Sorry, had to get my 'tom foolery' over with for the night.

if your mounts and injectors check out then your engine shocks are next to suspect.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

I have 83 300D That would spill your coffee at idle...That was until I did a diesel purge treatment. Seemed to mellow the idle right out, and was a lot cheaper and easier than motor mounts or engine shocks. Also, you might want to check the rack damper pin on the injection pump to make sure it is tight. Be careful not to torque it too much!

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Pure Vermont Maple Syrup
http://www.squaredealfarm.org

1982 300D Turbo
1983 300D Turbo

I've never touched my injectors, and my engine is seems to be idling smoothly. I'll check my mounts again. How difficult is it to replace the engine shocks?

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85 300TDT 456,000 orig. miles

I have the problem you describe, exactly. I have replaced mounts with new dealer mounts(there seems to be some doubt about non-OE parts in this regard), new Febi Bilstein engine shocks, new dealer upper shock mounts, and new dealer lower bushing kits. Adjusting the valves helped a lot, as six had tightened up to my surprise(I had adjusted them not to long before). I'm going to do a purge and tweak on the rack bolt a bit as there is still a little bit of shake at idle, however car drives out well otherwise.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

If it sputters intermittently, rocking side to side (especially when fully warmed up)-diesl purge, a set of fuel filters, and a valve adjustment sounds in order-synthetic also helped mine a lot too, dino oil sludged up very quickly.

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K

My engine is idling fine though. No real shake. I guess I'll just live with it. With the mileage I have I shouldn't complain.

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85 300TDT 456,000 orig. miles

455000??! yeah, I agree on the not complaining part

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1967 W110 200D
1977 W123 240D (RIP)