dbsonic

My Feedback: (3)

Can anybody tell me which state or phase the starter motor should disengage from the compressor nut? in a P120SE.

I know the yellow led tells whether it is engaged but want to know when it should go off/at which point in the startup sequence. I had to change out the starter o-ring at 8hrs which seems far too soon and wonder if the motor is somehow hanging up or staying engaged too long.

KC36330

when the yellow LED goes out the starter should disengage. GSU should change from accelerate to stabilize.

mr_matt

My Feedback: (10)

I think it depends on the turbine type but they pulse on and off up to maybe 30k RPMs. If you are going through o rings you might want to check the clearance between the face of the o ring and the nut. The might be to tight or too loose.

dbsonic

My Feedback: (3)

Thanks both. I will check for this on next startup. I was pretty sure it was engaged past 10k(glancing back and forth between the led and rpm readout) and wondered if that was normal. Sounds like it is designed to endure significant rpm. With new o-ring in place I will see if it has changed at all still has fair bit of clearance .. maybe couple or 3 mm IIRC.

KC36330

After ignition is detected the starter ramps the turbine to approximately 20K RPM before disengaging, if the turbine lags down during acceleration it will kick back in and spool up again.