603 Vacuum Pump & Oil Pressure

[markg612]

REFERENCE 603.960/124.133 INSTALL

Brian,

I hope you could weigh in on this.

Based on my assessment of the oil circuit on the 603s it appears the oil pressure could be affected by a defective vacuum pump, especially after it warms to 85°C

Currently, when the engine is cold or first starts even after it's warm, all is well, but once the temps rise to 85°C, the pressure "pulses", at about the same rate as the vacuum pump pulses, also, the heater shifts back and forth between full defrost (default for no vacuum) and normal, again, only after normal temps are reached.

Big Question: Have you ever seen a failing vacuum pump effect oil pressure? Oil pressure is perfect cool or cold but pulses once it's normal. Also, the heater vacuum shifting doesn't happen until normal temps are reached.

Thoughts?

Thanks,
Mark