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  #1  
Old 05-06-2000, 10:33 AM
Dennis Taylor
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I had to replace a camshaft and rocker arms etc on a 1978 300D. I can not seem to get the engine to "time" correctly. Lining up the crankshaft and camshaft is not and issue but making sure the "injector timing device" is correct is not explained well in the manuals. Does it have a reference point, that I can't see? The injector pump timing is well described (has alignment reference marks) but if I rotate the engine by hand I can not get the injection point to "fire" at the correct time.

Any help appreciated.

Dennis
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  #2  
Old 05-06-2000, 10:10 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I e-mailed you a file that will help. They key is making sure the engine is turned to the start of the delivery of the #1 on compression stroke, NOT TDC...Then line the marks up on the pump and install it.

------------------
Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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  #3  
Old 05-07-2000, 11:10 AM
Dennis Taylor
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Donnie, thanks for your response. Yes I tried setting up at 24 deg's BTDC and have made a template to mark the pulley for correct "firing" angle for each cylinder. It is my believe that the camshaft gear and the "injector timer gear" both turn at 1/2 crankshaft speed. On the three attempts I made so twice the car will not idle and exhaust is dark grey, the other time white/blueish. Its a bear removing and reinstalling the oil filter assy each time.

The same approach on my 300SD rolling it over by hand, the "firing" of the injectors in consistent. Its appears inconsistent on the 300D and I believe all the air is bled out.

This car has always been the odd one, accelerates better to 40 mph than the two turbo's I have, and the engine is overall quieter. Now if the daughter had kept up with oil changes (or I had replaced the valve seals earlier) the cam would not have 'flattened' and I would not be having this issue.

The car was also the hardest to start cold but the smoothest running. In testing the timing chain for stretch it appears correct, but I'm to the point I may just change it anyway, the other posibility is to convert it into a parts car.

Dennis
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  #4  
Old 05-07-2000, 10:37 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I do think, that if you are real tricky, you can get this out without removing the oil can. Make sure the cam is pointing up on the first two lobes, and that is compression stroke, The cam does turn at 1/2 crank speed.
Good luck.

------------------
Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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  #5  
Old 05-15-2000, 10:32 AM
Dennis Taylor
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Just to close is loop out,

I got the time to work on the 300D again yesterday. I took the injector pump from 'smelly - the parts car' and went thru the injector timing issue one more time.

The intial result was white/bluish smoke but the car would run although very rough. I advanced the injector pump as far as I could by rotating it towards the engine. It started and runs very well. It appears this engine needs more advance to run.

Thanks for the help, now back to finising up on the 300SD.
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