The bearings on the piston pumps can fail and when they do they can make a mess of the place

Blindly replacing the pump isn't necessarily going to help - a co-conspirator is the intermediate shaft bushing: Play in the intermediate shaft allows too much longitudinal movement which exaggerates the "roller coaster" effect of the piston pump bearings rolling over the timing device's track

I did a rather silly involved thread on the piston pump a few years back =>

http://www.peachparts.com/shopforum/diesel-discussion/339870-more-than-you-likely-ever-want-know-about-om61x-piston-vacuum-pumps.html

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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!