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

'83 300D, Knock: injector, rod or what?

Just bought a one-owner '83 300D with 116k verified miles. Service book was regularly stamped. Car starts instantly, idles perfectly runs great. Has 2.5 bar oil pressure at idle. But it has a definite knock. Took it to the local independent MB repair facility. Diesel mechanic has three 300D's himself. I used my infrared remote thermometer and showed him that the injector body of #1 cylinder was showing just 120-degrees. Other four 170-175.
Injector was removed and replaced. Good compression--in the 300's. Haven't had chance to recheck temp. Knock is still there.
Now I am told it is most likely a rod knock! I don't have the money to start rebuilding the bottom end of this engine. Plus I am surprised that a rod bearing would go with this low mileage.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

85 300SD w/ Trap Oxidizer vacuum presure reading

I followed Kent's instructions the best I could in his Vacuum Diagnostic manual. Here is what I did and what readings I got: following the main black plastic line to the firewall, there are several lines that split off. 5 in total, I believe. I unplugged the four smaller, colored lines and plugged them with golf tees. The remaining line is actually some sort of plastic housing unit with a curved rubber hose attached. I took my measurements from this point and with the engine on, I got a measurement of 10 psi from my mityvac. I think this means something is up with my vacuum pump, unless I performed my measurements incorrectly.

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

Alarm Buzzer Steering Lock 1983 300SD

Kent,

I have read your manual for the replacement of the steering lock + tumbler and purchased all the parts I need. I have a steering lock from a very well maintained 91 420SEL. Can I use the alarm buzzer from that one for the steering lock of the 83 300SD? It is different in that it allows for one more plug than the one on the 300SD - but the other plug looks the same.

Thank you
Dieter

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

1984 300D Stalling

I have replaced all filters, including the one in the tank and all looked clean. I am still experiencing loss of power and then stalling as if a filter is clogged. When pumping the manual pump attached to the injection pump, it does not have pressure. It's like there is an airlock, but engine will start. I also checked the tank and it is vented. Any ideas? Thanks.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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