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Old 07-20-2006, 07:34 PM
fireman1073's Avatar
Join Date: Nov 2005
Location: new bedford Massachusetts
Posts: 179
vacuum pump outlet

does anyone know where the vac pump outlet is?

My pump check valves seem to be stuck ( air pushes in and out of vac line )
little to no vacuum so i sprayed sum wd 40 in the line and voila vac is back but it acted up again.

Sooo when i spray wd40 in the vac line where does it go after the vac pump?

Is there an outlet internal or external?

can i flush the pump with sum mild solvent to clean it or will the solvent end up in the motor?

Should i just pull it and rebuild?


oh-- 84 300 SD with newer style pump ( screws in front cover )

85 300d in progress
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Old 07-20-2006, 08:04 PM
Motorhead's Avatar
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Join Date: Dec 2002
Location: Ca.
Posts: 975
You might need a vac pump rebuild. I THINK that your later vac pump ehxausts into the crankcase. The early ones ehxausted into the clean side of the air filter.

My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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