peter-h
Line Up and Wait
I have noticed, over the two pumps I have had, that there is a gradual loss of vacuum when the engine is at idle (700rpm; IO540-C4).
It starts to be noticed after say 200hrs. If the revs are raised even slightly, the vac is back in the green band and all is fine.
I wonder if others see this too.
The carbon vanes wear gradually and this must show up somewhere.
My first pump was changed at 700hrs at SB569-time, as a precaution, and the 2nd one is on 300hrs.
It starts to be noticed after say 200hrs. If the revs are raised even slightly, the vac is back in the green band and all is fine.
I wonder if others see this too.
The carbon vanes wear gradually and this must show up somewhere.
My first pump was changed at 700hrs at SB569-time, as a precaution, and the 2nd one is on 300hrs.