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Information on diagnostics

Vacuum pump damage

lack of lubricant due to incorrect mounting

What could cause this vacuum pump to fail? Why does the braking power reduce and why does the support from the brake boosters drop? Is this caused by lack of lubricant? This is possible on vacuum pumps driven by the camshaft. Find out why the vacuum pump fails and how you can prevent this here.

VehicleEngine identificationVacuum pump
 Pierburg No.
Citroën, Fiat, Peugeot
with 1.8/1.9 l
Diesel engine		XUD7, XUD9A,
XUD9AU, XUD9TE,
XUD9Y, D9B		7.24808.11.0

 

Vacuum pump fitted to the cylinder head

Possible complaints:

after having replaced the cylinder head

  • Reduced braking power
  • Loss of braking power support
  • Total failure of the vacuum pump
Important: proper lubricating oil supply to the vacuum pump

During checks in the workshop it is determined that the vacuum pump has failed owing to insufficient lubrication. Affected are only vehicles with the engine identifications given above in which a vacuum pump has been built in which is driven by the camshaft. Vacuum pumps driven by a V-belt are not affected by this.


Cause:

When replacing the cylinder head within the scope of an engine repair, the closure screw was not removed which seals off the opening of the lubricating oil supply to the vacuum pump.

In the case of vacuum pumps which are driven by the camshaft, this closure screw must be removed from the cylinder head.
If this is not done, the vacuum pump will suffer a total failure due to insufficient lubrication already when being operated for a short period of time.

NOTE

Before installing a new vacuum pump the lubricating oil supply system must be checked under all circumstances!

Keywords :
vacuum pump
Product group :
Vacuum generation

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