One dull cold winter a few years back I did this thread about piston vacuum pumps =>

More than you are likely to ever want to know about OM61X piston vacuum pumps

There's a little bit more information there if you have the life span to look through it all (!)

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Subject of OP's post #1: Cam lobe condition as a source of noise.

Steps taken of inspect cam lobes: Ask for videos of someone else's engine.

The approach is certain to be definitive and rewarding.

I don't think you understand my reason for asking for a video. The cam cover is going to be removed and lobes inspected regardless. What I'm concerned about is identifying the CAUSE of the worn lobes. Was it typical wear or did it occur at an extremely accelerated rate due to lack of oil distribution. Thus, would like to see what oil distribution looks like on other engines when running and cap removed.

My 617 has a tube running parallel to the camshaft that continuously streams oil on each individual cam while the engine is running.

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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.