ignition vacuum lines

[james f. coon]

I'm a new member. Hi to all.

I was at a towing yard a couple months ago and noticed a 77 300D in the yard. Ask what was wrong with the car and the owner said the engine was shot and he was going to take it to the scrap yard. The car was in immaculant shape for having 317k on it. I bought the car for scrap price. It had a new injector pump, glow plugs, injectors, complete front suspension. Unfortunlately the engine was shot. Four out of five rod bearings had frozen up and the crank damaged beyond repair (according to the machine shop). I had all the paperwork in the glovebox of past 2 owners and Dealer paperwork where they replaced the engine at 58K in '83. The auto parts/machine shop had sent the crank out to be turned. They said the crank was past .020. and .030 bearings weren't available. The auto parts people ask me for the 617.--- number on the block for replacement bearings and I found the 617.and the rest of the number was ground off. They said without that --- number it was impossible to get parts for that engine.

Not being a Mercedes diesel mechanic, I had to take their word for it. I am a shadetree mechanic and have never worked on a diesel before nor have I worked on Mercedes.

I found a 77 300D at a junk yard and it had 212K on it. Paid very little for the engine and decided to rebuild it. The oil pump functioned well, testing it out of the engine. The oil pressure at start up reads 45 lbs. But after the engine gets warmed up the pressure only reads 30lbs.

My question is: Is it possible to remove the oil pump without removing the engine?

I also have a problem with the positioning of the vacuum lines that go to the ignition switch and various other places. Is there a website or book that will show the correct application of the lines? Any help out there will certainly be appreciated.

Ask me any question about my 1970 Chevelle SS 454 or my 1969 Pontiac SJ 428 show cars and I'll most likely have an answer. I built these two from the ground up. But I'm at a loss with this Gorgeous little Mercedes and would appreciate your help.

Thanks, JFC697077