W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

240D dancing oil cap

Kent, Hope all is well. Ran the purge and installed the new Monark injector tips and boy what an improvement! As is always the case, fix one thing and find another... Got your Diesel performance book (with the tips order), went thru the various tests and find a moderately dancing oil cap. Being a noob now hindsight is 20/20 but my question is this - assuming I need to do an overhaul, what is the typical needed parts list, cost for same and "ballpark" labor charge for doing an overhaul. Before I had it shipped from CA I had a Mercedes mechanic replace the timing chain, now the new injector tips and really the car is running fine. So, do I tolerate it and just live with it and wait for the inevitable or be proactive? What actions can I do to reduce blow-by in the interim?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Locked Door Fix

I unscrewed the door lock button from a rear door and heard this terrible noise... the clinking of something falling down into the door. Now it seems obvious that the threaded rod that initiates the lock/unlock mechanism has fallen into the door. The problem is the door is locked and I am unsure as to how to get the door panel off to fix this. Can the lock be picked by a rookie or am I going to have to get a locksmith to open it? Why would it fall into the door unless it is not attached? Any ideas would be appreciated.

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

Changed motor and transmission mounts (Much less vibration!), but clunks when downshifting.

Purchased a new to me '82 300D Turbo diesel with 99K miles. Somebody really loved this car. It's very much like new. However, soon after I purchased the car, I noticed a great deal of vibration coming through the steering wheel and some in the seat of the pants. Changed out the two front motor mounts. Passenger side was collapsed, despite looking "ok" from the fender. Driver side was mush as the primer pump leaked on it and destroyed the rubber. The rear transmission mount was changed. Oddly enough, the wrong transmission mount was previously installed.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Seat not moving & window motor whirring

Just started digging into my brand new 1984 300SD to fix a few essential items; I was told the driver's side seat worked, just needed a new switch. So I ordered a new (used) seat switch and hooked it up and still no action. Any advice on where to go next? Also was attempting to fix my driver's side window... which is turning out to be quite a challenge. The motor works, however, the big drive gear just spins on there.

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

'85 300TD charging system

Hello, I suspect I have a charging deficiency in my '85 300TD(230K miles). To-date I have replaced the brushes/regulator, belts, replaced dash light and cleaned bulb holder. Voltmeter testing at the battery shows 12.5 vdc at idle, 13.5 vdc at 3-4K rpm. The dash light will not light at all, but shows continuity from the multi-pin connector across the bulb circuit with holder in place. As far as symptoms go: I occasionally (once every six months or year) find that the battery is low and will not turn the starter. The climate control system does not react to any setting less than full on or full off and the heater motor takes a few minutes of driving to start blowing.

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

diesel oil requirements in the 1980s

hey guys received my manuals the other day. well written and helpful. i guess i got lucky with my 240d buying it with limited MB knowledge. i do have a question as to what types of oil was mercedes requireing for oil changed in the early 1980s. my owners manual states that the car had regular maintanece (it shows 73k on the odometer but is has quit working) the oil changes were performed with castrol 20w 50 not exactly a diesel motor oil. these were done at authorized service ceneters . was this the best choice for oil back then? could this be the reason i have a lot of crank case pressure on an engine with less than 100k?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Pages