Zero oil pressure - where to start? - Page 2 - Mercedes-Benz Forum

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post #11 of 14 (permalink) Old 12-21-2015, 04:59 PM Thread Starter
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@rocky raccoon The rings are there, not brand new but not broken or brittle. I actually managed to borrow another filter housing cap and it made no difference. So now I think I really do need to remove the whole housing.
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post #12 of 14 (permalink) Old 12-25-2015, 01:58 AM
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Sounds like a broken oil pump or failed oil pump gasket. If you have a W126, it's not that bad: Pelican Mercedes-Benz Tech Article - Replacing Your Oil Pump on your Mercedes-Benz - Mercedes 380SEL and W126 Chassis
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post #13 of 14 (permalink) Old 02-03-2016, 01:22 PM Thread Starter
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Here's a follow-up post, in the hope of saving others the same trouble that I went through. The problem turned out to be the thrust piece at the top end of the shaft that drives the oil pump and is itself driven by a gear from the fuel injector. The brass ring against which the shaft turns had worn from ~3mm protruding to ~1mm indented, which meant that the gear from the gears disengaged and the oil pump was no longer driven. Replacing it was very easy. Here are a few points to note:

1. The thrust piece is very easy to access, much easier than either the oil filter housing or the oil pump, so if I saw something similar again it would be the first place I'd look.

2. There are several different variants of the thrust piece so make sure you get the right one for your engine. Luckily I bought mine from proper MB specialists (MBSpares in Canberra), because the part number that the web ordering sites recommended was the wrong one.

3. With a new thrust piece the engine stopped making a strange knock just as it turned off. I had suspected that the noise was something in the suspension since it coincided with that final shudder before finally stopping. But the knock was apparently a symptom of the worn thrust piece, even though my oil pressure was still fine at the time.
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post #14 of 14 (permalink) Old 02-03-2016, 06:36 PM
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