BENZ AID - COMMON QUESTIONS AND ANSWERS

79 W123 300D-Rear clunking/vibration ??

For about a year I've noticed a clunking noise/vibration in the right rear at sustained highway speeds after about 45 min. Almost sounds as if I dropped my muffler and the pipe is banging and dragging , and there's a noticeable squeeking or high pitched rubbing sound as well. New Tires and shocks, new brakes & pads ,new muffler, all donuts OK . Noticed a worn center drive shaft carrier and one cracked CV boot. Flex joints checked out OK.

Noise doesn't happen in normal driving around town. 2 mechanics have thus far been unable to diagnose.

Have any ideas?

Chassis Model Number

W123

Forums

Transmission / Suspension Specific Aid

1982 300TD Fully caharged battery dies after a few cranks

I have a 1982 123, 300TD and noticed the good battery dies quickly after just a few cranks of the engine. I tested each glow plug terminal with a light as shown on the cool videos you have, and noticed that two of the five do not light up. I looked at the glow plug relay fuse and it is OK, could I possibly have a short in those two glow plugs that would cause it to kill the battery that fast? Please help :(

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

126 /617 Engine shake at idle- Rack damper already done

Ok I am getting engine shake and it started about 4-5 months ago.
* When I start the car cold I do not get it.
* I can drive around in the city and it seems to never do it.
* If I drive on the highway and then exit after 5 or more minutes of sustained highway speeds (roughly)it does it and sometimes will not stop even after driving at city speeds. (UPDATE... it did it during city driving this morning once and then stopped at the next light, so I guess not it is just officially intermittent.
* I have replaced and adjusted the rack damper from upgrade bolt from MSource
* I have new fuel injectors from MSource (Monark ones)
* My car leaks nothing, not a drop from anywhere.

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

1987 190D knocking injectors

Year: 1987
Model: 190D (Turbo)
Engine: OM602
Mileage: 225,000

Problem: bad "metallic sound" - sounds like injectors knocking.

Overview:

This knocking exists at low RPM. The engine also idles very rough. It goes away when you rev the motor or place a load on the motor. If I run a thicker fuel (like clean motor oil or power steering fluid - bypassing the main tank), the knocking also almost completely goes away.

I have bled the lines. I purchased the entire injector rebuild kit (w/ new nozzles). I balanced each within 50psi. I have changed air and both fuel filters. I have removed and cleaned the main tank. I have blasted out supply and return lines (to and from) the fuel tank.

It may be worth noting that:

-> The previous owner *may* have run veggie fuel

Chassis Model Number

W201

Forums

Diesel Engine Specific Aid

'83 300TD Footrest removal

I'm having difficult removing cracked footrest. Footrest is connected to plastic kickplate with 2 plastic rivets. Kickplate seems attached to car body with a clip on the inside. I cannot remove kickplate no matter which way I pull it. Also, do I destructively remove the 2 plastic rivets holding the footrest? Do you sell new rivets? Thanks for your help.

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

1983 300D Turbo Boost Improvement Next Steps

At ca. 154,000 miles I have been slowly bringing the engine performance back to snuff. I recently rebuilt my turbo using your excellent kit. The compressor and turbine blades and shaft were in excellent condition so I opted not to purchase the replacement set.

Prior to the rebuild my boost pressure at 4000 rpm was 9 psi. Following the rebuild, there was no improvement in boost pressure. Per your instructions, I tested the waste gate (with a bicycle pump) and it appears to work.

The ALDA tube and Banjo bolt are clean; I've installed a new air filter, adjusted the valves following your instructions, installed rebuilt Monarch fuel injectors, and did a diesel engine purge (which was clean) and replaced the fuel filters.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Tired 87 560sl due for engine

A while back I purchased a 560sl to join my mercedes fleet. I thought it was a good deal, but it has white smoke upon start up. I am currently doing the repair/replace analysis I began thinking that while I was at it, it would be nice to get a little more horse power out of it. In researching the internet, I found that the sl 560 was de-tuned for the US market, that the SEL/SEC has more horsepower. Also when investigating, it appears that used sel/sec engines are less expensive than the sl motors.

Chassis Model Number

R107

Forums

Gas Engine Specific Aid

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