Not at all. Recommend using the search if there are terms you don’t understand. There is a huge amount of prior knowledge in these forums.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Lots in the archives, but essentially the vacuum pump has a roller that conveniently dumps its bearings into the chain.

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1981 240D 4sp manual. Ivory White.

@nelstomlinson - The cigar hose is used from the factory on every 615, 616 & 617 diesel both manual and automatic transmission I've seen. The hose is black rubber and is noticeably wider in the mid-section than where it attaches to both ends of the fuel line. I also believe it is more pliable than most rubber hose which allows it to absorb some of the pulsing in the fuel system. It is located on the left side of the engine bay in the line between the tank and the engine.


@keystoner16 - Re: preventing vacuum pump failure leading to major engine problems, the most effective method is to eliminate the mechanical pump and use an electric vacuum pump. If I had an OM engine that I wanted to last forever I'd probably do the conversion.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Yeah...

Such a sad failure condition.
Some failures result in oil pump blockage instead, giving the main and rod bearings starved for oil...

Replace the pump with a NEW one...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks, Sugarbear. I don't remember seeing one like that on my rig, so it's probably been replaced with straight hose by a previous owner. The genuine MB hose is surprisingly cheap on peachparts, so there's one on the way now. Now I just need to figure out where it goes...

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'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI

So that's what happened. I'm almost tempted to start taking it apart and see how hard it would be to fix. Almost.

Nah. I already bought another car.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

So will this be good bye then Skippy?

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Most likely, the cam gear is still properly timed, and the flat facing of the valves, means replace the cam, valve cover, and vacuum pump repair, along with an oil change could get the car back running again.

However, the exhaust valves are hollow, and filled with sodium, so, if they took the hit, they could fail, destroying the engine… so, a new set of valves would be wise.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

For a while at least. I was looking at replacing my Jaguar with an SL600, but every one I'm interested in gets sold before I can look at it.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

Skippy, with that manual conversion, that car is worth fixing.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

When I got rearended in 2013, I went with that line of thinking and got another 11 years out of it. This time around, parts availability has gotten worse, I already have a project car, and I went and bought another daily driver already.

Miata
Is
Always
The
Answer

Made in Hiroshima, because it's the bomb.

Attached Thumbnails

 

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

That sucks. Seems really odd (unlikely) that would happen.

Regarding the "cigar hose", I use a regular hose but read here that
making it longer and looping it keeps an air bubble in there that will
suppress the fuel pulses.

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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI

Is it not an option to remove the vacuum pump and replace the bearing in question with a better bearing that will not do this??

Ykobayashi performed that mod a few years ago if you search for it.
Pros and cons from memory

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1981 240D 4sp manual. Ivory White.

There isn’t a better bearing. There are better designed vacuum pumps, but the problem is the cage containing the bearing balls wears, resulting in uneven pressure on the warble plate in the timing device. That wear gets amplified, and the bearing dumps the balls. Some get wedged in the chain, and the timing is altersped, then valve contact with piston, and bam. Cam snaps, timing cover shatters…
but I imagine if regular bearing replacement was followed, it could be maintained.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!