Prop Governor

hharney · #1 02-23-11, 10:08 PM

When do you overhaul or replace the prop governor? At engine TBO? When you overhaul the prop? Has anyone ever had the governor overhauled or replaced?

edasmus · #2 02-23-11, 10:35 PM

Hi Herb,

I replaced both my prop governors about 2 or 3 years ago. My old ones were original and seemed to work fine and had been overhauled in 1988 when the factory remans were installed. My mechanic decided that 20 years was long enough to not have any service.

Well, I found out at that time that overhaul was not an option due to inability to get parts. The same opinion was echoed by two shops so I bit the bullet and purchased two brand new governors from McCauley at $2500 per governor (yes, $5000 bucks). My new governors did not support the prop sync system so that was removed from the airplane at that time. I never liked that system anyway and have not missed it at all. The governors that support the prop sync were an option but at an even higher cost. That system wasn't worth one penny to me so that part of the decision was easy. The new governors still look brand new and have about 250 hours on them now and work fine.

If I recall correctly, the old governors, according to my mechanic, had on occasion malfunctioned in a way that overloaded the hub with extremely high oil pressure and caused the hub to fail. This never happened to me but apparently it has happened somewhere according to him.

Anyway, I'm not one to argue and frankly I find it difficult to justify to keep 20+ year old parts as important as the prop governors in service if my mechanic says its time. So, the old ones are sitting in my closet downstairs and my hourly cost went up $50/hour for my 100 hours that year. So be it.

Good luck!

Ed

Skymaster337B · #3 02-24-11, 12:50 AM

The service manual says that the governor "should" be overhauled when the engine is overhauled...but also says that it is a "judgement" call to overhaul the governors anytime before that. And that you can get an overhaul manual from Cessna.

I can't imagine what else a governor overhaul would entail, besides new o-rings and internal springs. Has anyone seen a Cessna governor overhaul manual?

hharney · #4 02-25-11, 07:39 AM

My governors are Woodward. Is this what you had Ed? No parts, my mechanic is checking with a couple shops (H&S in Pontiac) so I will post the current availability for those when I hear from him.

I cannot find any indication in my logs where the rear was OH when the engine was replaced. I have a pin that is pressed into the lever that attaches to the shaft spring and the pin is loose. I think it's time for some attention.

Hope to see you both in Dayton

edasmus · #5 02-25-11, 10:36 AM

Herb my old governors are McCauley model numbers CFS310D1B/T1. Aircraft Propeller in Wheeling, IL located at KPWK and Aircraft Systems located in KRFD were the two shops that both painted the sad picture as far as any overhaul.

Ed

hharney · #6 02-25-11, 12:57 PM

That is interesting Ed, H&S just quoted me $850 for Woodward style and $975 for McCauley. They said that parts are no problem for either brand. They suggest overhaul at least every 1000 hours. Governors are not required at engine change or rebuild but some do the duty then. At any rate I think I will be overhauling mine with them.