The small one, or the large one?

IIRC it's the same part number for both o-rings on the oil filter stem despite the difference in installed diameter. I used whatever o-ring fit from an assortment I got at the McParts store.

Sixto
MB-less

This has been documented elsewhere... search the forum. Pretty sure it's the smaller of the two O-rings included with new fuel filter kits. MB # 009-997-81-48. Price sure went up, they had been under a buck each, now $6.50 list...

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I actually did search, but for whatever reason (maybe cockpit error) I struck out. I also remember seeing a post on removing and installing the stop lever. I kind of remember that not doing it right could cause the engine to rev and not be able to shut it off. I can;t find that any more either...

Doing more than you should is a bad idea. Simply removing the handle and a washer for access to the o-ring that has to be replaced shouldn't expose the IP to a runaway risk.

Sixto
MB-less

Good. I could not find that old post, but I thought it said that there was risk if the handle did not engage internally properly, but I just could not find it.

I think the dealer gave me the wrong size o-rings. I just went by there to pick some up and made a little longer trip to a Bosch diesel repair center and bought some of the Bosch ones. The ones Bosch gave me are larger and I remember the ones that came with the filter to be larger. I buy from them a lot so I got them for free, but even so, I think they are wrong. I'll see what it looks like when I pull it out.

The runaway risk is when replacing the vacuum shutoff pod, if you don't confirm the lever travel after replacing the vac pod.

There's zero risk when replacing the shutoff lever O-ring, that job is all external.

:chinese1: