prop synch

[Pete Somers]

The pot does give problems and the only way to check this is to replace it.
It does sound like either there is alot of play in the gearing or there is something wrong with the front pickup and it is not sensing the front prop RPM so the rear will hunt.
Do a check of the front pickup and a resistance check.
There is a separate book for the Cessna sync systems and contains all the info for checking out the system and the info on the test box.

Regards
Pete

[skymstr02]

If his rear engine is varying ± 50 rpm when sync'd manually, maybe the rear governor needs a shop visit?

[JeffAxel]

The rear governor was replaced recently as it turns out. I am wondering if there is a lot of slop in the prop cable, and that is something we are looking into as well.

[Dale Campbell]

Hi,
I have a 337H 1978 and had the sync worked on 4 years ago. They found both the pots intermittant. So they replaced the pot on the quadrant and the one at the rear engine sync. next to rear engine. Also the little motor on rear engine sync was removed, cleaned and new brushes installed. It worked for 3 years, but now is acting up again. Dale Campbell