On the W126.120 chassis, after the power steering pump, belts, etc. have been removed, is it possible to remove the vacuum pump without taking out the radiator?

Without knowing the depth of the pump assembly behind the mounting flange, and not having another pump to look at, I wanted to ask before starting the work.

The engine in this car is an OM617.950 out of a W116.120.

Thanks very much for any information on this...

Richard

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Respect, protect, and maintain complex systems - whether natural or of German design, to benefit from their full potential.

1982 300SD W126.120 with an OM617.950 from a W116.120
1984 300SD W126.120 with an OM617.951

I have a 123 but have had my Vacuum Pump off and I believe you need at least 3 and maybe 4 inches of forward clearance.
I did it without removing the Radiator; I put in a piece of Cardboard to protect the Rediator Core and Fins.

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84 300D, 82 Volvo 244Gl Diesel

No you do not need to remove the radiator. As mentione earlier protect the fins.

FYI you don't need to remove the power steering pump either.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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There's pretty good force pushing the pump away from the engine. Loosen the bolts a little at a time, about a half turn, so you don't bend or break anything.

Sixto
87 300D

Since I am continuing to work my way through all the potential problem areas on my recently acquired '82 W126 300SD, and am about to check the condition of the vacuum pump's cam follower and the drive cam on the 617.950 engine, I bought another vacuum pump (Pierburg #7.20547.50.0) in known excellent condition to have available for a new baseline to operate from.

I have now found that the vacuum pump on the engine is different from the one just bought and specified for the 617.950 engine.

The old pump has two threaded fittings, one for the steel line for vacuum supply, and the other for a flexible line running to the grommet on the U-turn hose from the air cleaner at the turbocharger inlet.

My checking so far tells me that the old pump is a diaphragm pump with several gaskets and the new one is a piston type pump having noticeably fewer parts. The new Pierburg pump has only one threaded fitting, for the vacuum source connection for downstream systems on the W126.

Question: Is there any significant reason why I cannot use the newer pump in place of the type found on the engine? The grommet at the turbo inlet would of course be closed off with a suitable plug.

Thanks very much for any information and opinions on this...

__________________
Respect, protect, and maintain complex systems - whether natural or of German design, to benefit from their full potential.

1982 300SD W126.120 with an OM617.950 from a W116.120
1984 300SD W126.120 with an OM617.951