Prop governor

[nels]

What should a prop governor overhaul cost? We put a freshly overhauled prop on my 65 E model and the pitch will not change. It's been about six months since the plane has s it been run. We checked pitch with air pressure and it did change as it should.

[carusoam]

There is a seal at the back-side of the front of the shaft that blocks high pressure oil that controls the pitch. It can get loose and leak oil internally back to the oil pan.

I found that seal after I had the governor OH'd on my C.

So if you didn't experience a wearing out situation, it just stopped working, I would check that the seal hasn't been moved by the prop work being done.

Prop goes to low pitch on failure of the governor. Same thing happens when the seal leaks off the pressure.

Best regards,

-a-

[nels]

We took the governor off yesterday and will have it tested today. As for the seal, I assume you are talking about the O ring on the nose of the crank? It was there but thought if it leaked then there would be oil on the ground?

[Cody Stallings]

Be around $900 to $1200....... The Hartzell H-1 is a very simple Gov, an cheaper than the others to O/H

[N601RX]

You can also get a new PCU 5000 governor for just a little more after you consider the core value of the old one.  It saves a couple of pound, works better and has a 7 year warranty.  No surprise charges with an overhaul either.

[jetdriven]

Sending in a prop governor for an overhaul is a nightmare. They tell you 800$, then ding you for 2 grand more in "updated" flyweights, a ne pilot valve, etc etc.   I would either exchange it for an OH unit or buy a more modern PCU 5000 or something like that.

 

We changed engine models to an A3B6, and, contrary to the Mapalist logic, the governor is a different model as well. We did an OH/exchange at Quality Aircraft Accessories for 1200$.  To convert ours would have been twice that.

[carusoam]

The seal is an aluminum disk that gets hammered into place...

It's not a very common problem, but it happened to my C. I've heard of others, but none on MS that I am aware of.

It fell out of place, so I got the gov OH'd and didn't fix the problem. Rpm reverted to max, and wouldn't change.

Like Byron indicates, old govs will require weights and other parts. They have rotating parts similar to the other engine parts including an oil pump of the geared variety.... That rotate and wear all the time...

-a-

[Wildhorsesracing]

You can also get a new PCU 5000 governor for just a little more after you consider the core value of the old one.  It saves a couple of pound, works better and has a 7 year warranty.  No surprise charges with an overhaul either.

 

I did this and am extremely happy with the PCU 5000 - much cheaper/easier/lighter and you can't beat the warranty!   Works perfectly!

[nels]

I sent gave the governor to Maxwell Aviation in Minneapolis for overhaul. They checked the output while i was there and it showed lots of internal slippage, about 16 gal/min. We actually spent about half an hour at the test machine doing runups and discussing the data. He tore it down to inspect and gave me a rebuild cost of $850 which include a new sleeve valve (?) that fits in the bore of the unit. The sleeve is what appears worn as it is beyond tolerance and the bore measured well within tolerance. It should be ready by the end of next week. I asked him to send along the performance data after overhaul so I know what I have. The guy seemed to know what he was doing and also seemed capable of proper diagnostics.