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Old 10-26-2001, 11:49 PM
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Fuel column “leak down” & Injection Pump element check valves - replacement procedure

I have been reading through the archives regarding replacement of the seals in the injection pump delivery elements. Steve Brotherton has made several postings regarding the symptoms related to faulty check valves seals, but there is very little information as to how to actually replace them.

In one posting there is a reference to a special socket to torque them down. In another posting there was a statement that the elements cannot be removed (except by a shop) from pumps that have "external fuel correction" capabilities.

My car is a 1984 300D -- do these pumps have external fuel correction? Is there really need for special socket to torque them down? If so, where could I obtain or rent one?

Has anyone actually done this themselves? If you could please post some helpful hints on how to do it, I would greatly appreciate it!

Thanks in advance!

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Old 10-27-2001, 09:20 AM
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Location: Tucker, Ga USA
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The OM 601/602/603 engines are the ones that need a "special" socket.
On the OM617 engines the only thing you DON'T want to do is remove the 2 13mm nuts on either side of the delivery valve. This is the external fuel adjustment.
Most of this type of work isn't really DIYER!!!
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Old 10-27-2001, 02:31 PM
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Smile 1000 Thank Yous!


I was a bit concerned that wouldn't receive any responses to my inquiry due to its somewhat esoteric nature.

I fully comprehend your warning regarding this not being a typical DIY job. I really hate to even say this (because it sounds so arrogant when written in text), but I believe that am quite up the task. I am not deluding myself regarding my capabilities; this is just the first diesel that I've ever owned and I'm still on the steep end of the learning curve. Of course, the learning is the fun part -- the bloody knuckles are another story.

I hate to impose upon you, but could you please help me with just two questions?

1. Is the sealing ring that develops leakage the one that goes underneath the delivery valve holder, or is there another internal (within the delivery valve itself) seal that needs to be replaced?

2. Would it be more prudent to replace the delivery valves as a unit (if they're available) or would that be an unnecessary expense & overkill?

Thank you once again -- your help is Greatly appreciated!

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