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Diesel engine vacuum pump


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I was wondering how the vacuum pump works on an SDI. Anyone ever stripped one down?

I think that its wierd that instead of generating a pressure system to operate the brakes on a diesel car it still uses the same vacuum boost as on petrol cars. I guess it just makes it cheaper to have the same brake system on all models...?

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For diesel engines, the vacuum formed in the intake manifold is too small (because a Diesel engine has no throttle butterfies  then a vacuum is not created in the inlet manifold in the same way as in a petrol engine) so a separate pump is needed for the brake servo pump and for the control of actuators (EGR, turbo, etc).The PD motors are included it in the tandem pump.

 

 

 

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So the inside of our pumps is a blade wiping system, like inside some ac compressors. Anyone ever heard of them failing? Mine are fine, but curious to know if anyone has ever come across a duff one. I like the way that they are lubed. Clever.

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