IP timing of '72 220D - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 04-24-2008, 02:25 PM Thread Starter
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IP timing of '72 220D

Hello, My buddies '72 220D 4-speed is showing signs of retarded IP timing so, after searching around here, I made him a offset 13mm wrench and last night we tried turning the pump a little towards the engine. First thing we noticed is that the bottom nut was missing so we really did not need the offset wrench. Also the other two bolts on top were loose enough to turn by hand. My first thought was "hey this is going to be easy" but that went away when we were unable to rotate the pump at all even when it was loose enough to be moved 1/8" away from the mount.

His car is some sort of grey market import that has the IP with the "oel" cap to fill it's separate sump on the back of it so maybe it's not supposed to rotate. Any ideas how to advance the timing of this pump? I realize it won't just flop about like a loose distributor might but we put enough, I think, force on it to move it a little if it was ready to.

TIA, John..........
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post #2 of 6 (permalink) Old 04-24-2008, 02:35 PM
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If I recall correctly...

there is a splined sleeve that connects the injection pump drive on the engine to the input shaft on the Bosch pump. A variation in the timing can be accomplished there, IF there is not a "key" spline that allows alignment in only one configuration.

The downside is that you will have to pull the pump to see if this is, or is not possible.

Good luck,

JR
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post #3 of 6 (permalink) Old 04-24-2008, 02:48 PM Thread Starter
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No way to access it from behind the vacuum pump?

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Originally Posted by E-Class Owner View Post
there is a splined sleeve that connects the injection pump drive on the engine to the input shaft on the Bosch pump. A variation in the timing can be accomplished there, IF there is not a "key" spline that allows alignment in only one configuration.

The downside is that you will have to pull the pump to see if this is, or is not possible.

Good luck,

JR
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post #4 of 6 (permalink) Old 04-24-2008, 03:22 PM Thread Starter
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Could a maladjusted governor linkage or a leaking governor diaphragm also cause a white smoke and poor throttle response situation?
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post #5 of 6 (permalink) Old 04-25-2008, 08:27 AM
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I am not sure on those issues...

I would think that a governor issue could cause a loss in performance; that makes sense; however, I am not a bona-fide "diesel dood". My familiarity with mechanical injection primarily comes from the gasoline engine side of things, and those systems are much more forgiving of timing issues, etc.

I would suggest a post in the W123 forum, as there are still a great number of diesels in that chassis floating around, and someone more qualified than I am may be able to give you a hand...

Good luck,

JR
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post #6 of 6 (permalink) Old 04-25-2008, 10:30 AM Thread Starter
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Thanks
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