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

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Diesel Engine Specific Aid

'85 300SD emergency manual start

Without warning, no glow plug light in the dash and glow plug relay under hood clicks on then off immediately. (Chicago) I use the block heater overnight so morning starts are a given, but after teaching all day, afternoon starts, it seems the glow plugs sort of work still if I wait 15 seconds, but startup idle is a bit rough and a little black smoke puffs out where before there was none. The engine was factory replaced before I got it and has about 40K miles on it. QUESTION: For emergency starting until I can get the replacement parts for repair, can I run a wire from the battery terminal to the # 1 glow plug top, hold it there for 10 seconds, and then go start the engine? (maybe 12 sec. if in lower teens outside temp).?? TIA in advance for your most valued advice to everyone.

Chassis Model Number

W126

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Diesel Engine Specific Aid

Preventive maintenance, avoid catastrophic failure, '82 300D

Hi,

I purchased today an '82 300D Mercedes with 150k miles for $1500, but there are no maintenance records that came with the car.
The car is running fine, but because I have no history, I prefer to assume that none of the maintenance is up to date.
Beside the obvious fluid and filter changes, WHAT ELSE I NEED TO DO TO AVOID CATASTROPHIC ENGINE FAILURES?
Is it possible to get a list or point me to one if it is already answered?

Thanks, Mike

Chassis Model Number

W123

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Diesel Engine Specific Aid

1984 300D front pipe replacement

Hi all, hope everyone is healthy and enjoying the new year. I am in the middle of replacing the front pipe on my 1984 300D Turbodiesel. This is the pipe that has some accordion flex incorporated into it and runs from the back of the turbo to the pipe of the resonator situated just under the passenger footwell. My question: Is the seal ring or "donut" the same type on both ends of this pipe secton?

Thanks for any help.

Chassis Model Number

W123

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Diesel Engine Specific Aid

1984 300D Noisy Turbo

I have a strange noise that sounds like a fan with bad bearings. I hear it when the car is under load (going up hill) or just hard acceleration. Sounds to me like it is coming from the turbo. Is there any typical recomended areas to inspect that would cause this such as the EGR valve or intake manifold for this car. Also is there a cleaning solution that can be directly sprayed into the Turbo?

Chassis Model Number

W123

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Diesel Engine Specific Aid

1977 240d - missing heat shields?

I am replacing the injectors in my 77 240d with rebuilt injectors bought from this site. After removing the old injectors I did not find any heat shields in the pre-chamber, or at least it seems there are none. There is certainly nothing that can be picked out using the little angle pick sent with the socket kit.

Is it possible that the car did not have heat shields? Or am I just not trying hard enough to get the old ones out?

Here is a link to a picture showing one of the pre-chambers. Can someone tell whether I am looking at the bottom of the chamber?

Chassis Model Number

W123

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Diesel Engine Specific Aid

1984 300sd flashing lights while cranking

My wife's venerable 368K mile 1984 300sd decided not to start and left her stranded. It cranks slowly but will not start and the dash lights flash while it cranks. Followed the normal systematic diagnostic approach; the battery was 5 years old, it was replaced with new,replaced the glow plug relay fuse and it has 12v power, the number 13 fuse was blown, replaced it, replaced the voltage regulator, wiggled and manipulated the shifter to see if it was the neutral safety switch, checked and rechecked all connections make sure they were tight and connected.

Chassis Model Number

W126

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Diesel Engine Specific Aid

86 300SDL Optima battery install fried something

I was taking care of a few things before my monarch nozzels, balancer, and trans cooler lines come. Here is what I did I bought a yellow top optima put it in heard pop okay? tried to start it no glow light no antenna. Smoke from the alternator (it's okay to laugh now more laughs later too!) the voltage reg. was hot and stayed hot so fried right? Pulled it out it was going to go anyway carbon stacks real low. the only thing down where the smoke was is the alt. Here is what happened if you look at the front of an optima the positive is on left neg.

Chassis Model Number

W126

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Diesel Engine Specific Aid

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