[QUOTE=standardbyke22;4537323]The vacuum pump is to the left of the injecton pump on the top of the motor right? Any way to test or service?[/QUOTE]
The vacuum pump is at the rear of the engine. If it was a gas V8, it's where the distributor would be.
The vacuum pump is made up of two pieces. The "drive" and the "vacuum pod." You cannot run the engine without the drive in place since it runs the engine oil pump. This section has bearings in it - along with a helical drive gear. The "pod" is just a tin can with check valves and a diaphram inside. This you can remove still run the engine.
I suggest you listen near it and see if the noise is coming from there. Stick a garden hose by it with the other end at one of your ears. If it IS the noise source - pull the pod off and see it it changes anything - but it the drive might leak a little oil with the pod off.
To check the drive - you'd have to remove it and inspect it visually - and you cannot run the engine with it off.
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