6.2l diesel vacuum testing

[corelokt]

Where do I test the vacuum on my 86 6.2l chevy diesel, and what numbers should I find?

 

[British Slave]

No vacuum on a diesel. There is an external vacuum pump to operate the accessories.

 

[Papi Grande]

Your vac pump should be on the back of the motor where a distributor would go on a chevy gasser....is there a particular problem you are havinf because of lack of vac?

 

[corelokt]

I know about the pump driving off the oil pump on the rear of the manifold.. What I wonder is what number, ie. how many inches, it should be drawing. I also wonder where the reading is taken, as it fluctuates when taken at the pump, but is steady past the valve in front of the air cleaner.

 

[Russell]

Take your measurement right where it goes into the HVAC controls using a T fitting. The pump should pulsate for the first bit, but if you don't have any leaks in the system it should settle at about 20 in hg

 

[corelokt]

Thanks.