How do I test my vac pump? I can't get one of my 300 SD's to stop running.
I put on a new shutdown valve, and checked all the lines. If I have a problem
with the pump would that explain why my tranny is not going into reverce very
well? Thanks. Jay

81 300 SD 138 Miles " Black "
81 300 SD 134 Miles " Diamond Blue Metallic "
81 300 SD 237 Miles " Diamond Blue Metallic "
83 300 SD 166 Miles " Cream "

Tap into the line from pump to brake system.
Just unlug one of the lines from this larger line and attach a vacuum gauge.
A hand vacuum pump like mighty vac has this gauge built in.

I think the number is 19 to 22" of vacuum.

Using the handheld vacuum pump attached to the vacuum shut off on the back of the injection pump - test the shut off valve.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

Try this too for finding vac leaks.
Diesel Giant's Vac System Troubleshooting

__________________

Vac problem will do shifting not selection problems.

__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Transmission:
http://www.peachparts.com/shopforum/showthread.php?t=142395

Have a great day.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
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Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

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