Date registered: Sep 2008
Vehicle: 1983 Mercedes 300DT 301500 miles
Location: Salt Lake City
Mentioned: 1 Post(s)
Quoted: 1 Post(s)
1971 240D Newly aquired. Injection pump not building pressure. Car sat for years.
I recently acquired a 1971 240D, which was originally a 220 gas I believe (as there is no glow plug/salt shaker thing on the dash). Also the pull knob was mounted under the steering wheel.
I don't know much about it except that the engine is form a 1975 240D and has the pneumatic M pump. It also apparently has not ran since August 2005.
I want to get it started.
Here is what I've done so far.
- Changed the oil
- Hooked an external jug with diesel (to eliminate the tank).
- Primed and primed and primed... When cranking, diesel was not coming out of the return.
- Turned out one of the check valves on the lift pump was broken. I replaced it.
- Turned out the lift pump shaft that the camshaft of the IP pushes on was stuck in the pushed in position (the spring did not have enough force to push it back). I freed it up. Now the lift pump works great.
- Also all 4 plungers on the IP were stuck. I freed those up as well.
- The overflow valve seemed operational, however, the spring was only 21mm so I extended it to 27mm.
I have the pump set in the start position (rod is all the way to the right when looking at it), when I crank, I get nothing out of the IP. There must be something else stuck inside the pump. Any ideas what it could be? I am trying to avoid having to remove it as the bottom bolt seems to be a real pain.
On the bright side, after quite a bit of cranking, I finally got oil pressure.
1983 Mercedes 300D Turbo 327 000 miles. Spare car.
1994 Mercedes C220 converted to run on Natural gas.
Bought at 138 200 miles, current odometer: 310 500 mi
Last edited by Tedd300DT; 09-29-2014 at 07:46 AM.