I tried to replace the injection pump assembly on my 1985 300SD turbo diesel but I didnt think I got it right. First I turned the motor over to where it was 25degrees before top dead center and then assembled the pump to the engine block. I am not getting any combustion what so ever.

Put the engine back to 24/25 d BTDC (don't remember the exact setting here - refer to the manual) and pull the pump back off. Make SURE you have the "splines" lined up like the pic shows. After you put it together you have alot of stuff to fill up with fuel. Pump/crank/prime etc... and if it was running prior to removal of the pump you should be able to get it going.

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Jim

I lined up those splines before assembly to the block. Although I didnt check the cam position if it was in the compression stroke.

Sorry.. idiot suggestion here. Did you use the right pump for an 85? Just a thought.

Good luck..

yes......it came off an 85 300D 617 engine

mrbnz007
Before you go to any other lengths - this is what I suggest from my experiences on VW diesel injection pumps. If you are sure the timing is set properly, fill the injection pump with automatic tranny fluid - it will lubricate the pump. When the pump is filled, re-connect the fuel lines. Crack the injector lines a bit on each injector to ease the removal of air in the lines. Then crank the heck out of the engine - pausing to prevent the starter from overheating. When you see tranny fluid coming from around the nut on each injector line -stop and re-tighten the nut on that injector line .Continue to crank until the tranny fluid has come out around each nut and each nut has been re-tightened. When fluid has come out around all the injector nuts and they have all been re-tightened - Glow the engine and it should start. I don't have a Mercedes diesel but I work on VW diesels all the time and this method is the quickest I have found. Hope it helps
Merry Christmas!!

Once you have installed the pump according to the excellent information offered by Jim, then you MUST do a start of delivery adjustment. Aligning the splines and then meshing them into place with the engine in proper position is only half the work.

Also, cylinder number one must be on the compression stroke when putting the pump into position. Once the splines are properly timed, you only have the rotating assembly of the pump properly aligned.

Just like a gas engine distributor, you must then rotate it so that it "fires" at the proper time. Aligning the IP body mark to the engine casting mark will probably not be close enough.

Hope this helps,