W123

1983 300d rough idle, no power

I have a 1983 300d with 155k miles on the engine. I have a rough idle issue and no power on take off. slow as a old dog. I have replaced all diesel filters. in tank screen also. I replaced motor mounts and shocks. performed diesel purge, got lil better, but still same issue. Performed valve adjustment, checked cam lobes, ok. performed cold compression test, found 410 to 405 on 1,2,3,4 and 5 cylinders. replaced glow plugs and relay.checked turbo alda, correct and functioning. checked for blockage, found clean and clear. I really dont know what else can be causing this issue. HELP!

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

$2.75

Service 10 mm Head Size Locking Nuts ( Set of 10 )

Common size on all Mercedes

$45.80

Early Diesel Pre Chamber Removal Threaded Tool (up through 1987 models only)

A slide hammer is required. A collar nut tool is required. See the full explanation below

1982 300D Hard Injector Line Replacement Alternative?

I am researching an alternative to the diesel injector hard lines that provide the fuel to the injectors.

I am interested in the nut size and I am looking at flexible hydraulic lines and racing fuel lines.

Does anyone have experience testing alternative fuel lines?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

$18.95

617 Diesel Flywheel Flex Plate Hold Down Ring - USED

For OM 617 non turbo and turbo in 1977 to 1985 300D 300CD 300TD and 300SD

84 300d turbo Valve adjustment and compression test

Two quick questions. I am about to adjust the valves (5cyl 617) to do a compression test on an engine that has not been turned in a couple of years. I just took the valve cover off and everything looks as it should. No sign of corrosion anywhere, oil still present on surfaces.

Should I put oil down the cylinders prior to turning for valve adjustment?

How much in each cylinder?

Thanks

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Read more about 84 300d turbo Valve adjustment and compression test

1977, 300D, 123 chassie

1977 300 d 123 chassie Would like some instructions on troubleshooting the heater and air cond. system. The blower comes on only for the defroster.Is there a recommended change over for the 1977 air cond. unit to be able to purchase the freon. I am not good using facebook but I am trying.
Thanks, Karl Stier