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Old 06-09-2003, 12:56 PM
Registered User
Join Date: Jun 2003
Location: Boulder Creek, CA
Posts: 86
Question Start of delivery -- the drip method

The next upgrade on my 240D is the timing chain. In my usual
obsessive-compulsive way I am trying to understand all the
parameters before I do it as I really don't like surprises in the
middle of a job. What I am trying to get my brain around
at the moment is timing the injection pump.

Reviewing the manual on start of delivery adjustment, I see the "drip
method" described. As usual, the description leaves much to be desired. The
description says to pump up the fuel pressure with the hand pump and wait
until it starts dripping about once per second--which is considered correct.
I have some question to those here who may have done this before:

1. What does the flow look like when the pump is to far advanced?
2. What does the flow look like when the pump is retarded.
3. Any recommendations on doing this for the first time?

I have seen these piezo-electric devices that allows adapting a standard
inductive timing light to a diesel motor. Does anyone have experience with
these? Do they work?

Thanks in advance

77 240D
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Old 06-09-2003, 02:00 PM
Registered User
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
1. It drips too fast
2. It does not drip
3. use the most accurate method of setting the crank position, have mechinical advantage available to you ( crow bar, blocks of wood ).
4. Turn the engine by hand two revolutions and recheck after you have tightened everything.
5. Find TCane's description of this procedure.
6. This is a chicken and egg deal to me. If you don't set the indicator in the proper place in the first place then you won't get a good reading anyway... and since you can't judge the fuel delivery except at static conditions... I don't understand how they would help.
I am still looking for the spark plug wire to put my inductive clamp on .......
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Old 06-10-2003, 12:09 AM
Registered User
Join Date: Jul 2002
Posts: 1,141
I think there is only one thing to add,

You need to pump the primer pump through the adjustment. Not clearly called out in the proceedure, but I believe Ritter told me that a few years ago.
I don't think the piezo electric things work that well with benz's. Later cars have a place for using a electronic measuring tool. It's a dream on post 82 cars. THen again, once you set on up- it's good for years.

Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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