W110 W111 W112 Sedan, BENZ AID - COMMON QUESTIONS AND ANSWERS

'82 300D stumbles to start - UPDATE, PROBLEM SOLVED!

my '82 300D stumbles when starting in hot or cold weather. i replaced the glow plugs and reamed the pre-chambers. they had minimal carbon build-up. i checked engine (1 degree stretch) and IP timing (24 degress BTDC) and they are both ok. compression is 24+ bar across all cylinders with 96k original miles on the clock. injector release pressure is low (1750 psi) and i plan to replace the nozzles and bump the pop pressures to 1950 psi. could the low pop pressures be the root cause for the stumble starts, or is there something else i need to check?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

86 300sdl oily gunk in crossover and intake

I am putting in my new balanced injectors and injection pump stub shaft o-rings. I took off the crossover pipe to gain access to the third injector and just give me more room to put hard lines back in after cleaning them off course. I found that there is an oily gunk in the cross over pipe and the intake should I be worried about my turbo? I do have a small oil leak from the turbo (the only oil leak on the car) are the doughnuts bad turbo getting bad ect. Should I take the intake off and clean it and get a new intake gasket soon?

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

1985 300D Turbo noise whining

Kent, thanks a lot for all the manuals and advice you've handed out. We now have 3 300d's that run well and were broken or barely ran when we bought them.
Now to the annoying stuff...there's a noise my '85 300d is
making. It wines, especially before it's warmed up all the way, when I'm
going less than about 45mph and loudest at around 35mph sustained speed. It
also will go away entirely if I stomp on the gas and when the car shifts
and the rpm's change which makes me think it has something to do with the

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1977 W123 dash lights not working

My dash/center IP lights don't work. I already tried replacing the dimmer switch and that didn't help. I replaced the headlight switch when I first got the car so it might have something to do with that since the replacement one was not exactly like the one I replaced. I've also checked all the fuses in the fuse box and replaced the bulbs with ones that were tested. All the warning/turn signal lights work, just not the ones that light up the dash/trans/etc.

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

'85 300SD Lifeless and won't turn over

Wow! Times like these I feel really alone in rural N.W. Indiana!! I went to change the radio (cassette) to a more modern am/fm/cd Blaupunkt Saturday night. Speaker wires were the hangup and I was told I need a floating ground adapter...? I thought each speaker had both wires coming to the radio and I could connect them as such to each corresponding lead from the new radio. The "experts" said I'd fry the radio and wanted to sell me this "floating ground adapter" for $40. I didn't buy it...I re-installed the former Becker original and had to re-splice the brown ground wire as I was all set to splice and connect ASAP.

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

1983 300 SD Vacuum Problem

Had minor vacuum problems (power locks don't work) but lately, trans shifting is slow. When engine is warm and reversing from parking, I need to rev the engine a bit before it shifts into Drive. Also, it takes a little longer to shift from 3rd to 4th with motor revving a little higher and a little longer.

I went to Kent's "Diesel Vacuum Source Troubleshooting and Repair" booklet and here's what I found. The booklet suggests the vacuum to the Injection Pump Shut Off Valve be tested. My car does not have one of those!

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

Pages