Don Patterson
Well Known Member
At first engine start the new Hartzell prop would not change pitch. I ran the IO-360 B4A engine 5 times at 1800 to 2300 rpm's with no luck. I pulled the PCU 5000x for testing at a local prop shop and checked out fine. I tested all lines and gaskets for oil passage and this checked out fine. I placed an oil filled pressure gage at the fitting just behind the prop and was getting 310 pounds of oil pressure from the governor every time I cycled it. I pulled the prop to inspect the rear plug in front of the crankshaft and it was in place.
This IO-360 B4A was overhauled about 5 years ago but was run with a fixed pitch. This is the first time with a C/S prop. The mechanic had passed away a few years ago. I am thinking something was overlooked at overhaul. I know the same case was used.
I put 80 pounds of air in the fitting behind the prop to get some pitch change (per prop shop) and it would change but not very much. Most of the air was just going into the case. Sounds like all of the oil from the governor is just going back into the case. Has anyone had a similar problem?
This IO-360 B4A was overhauled about 5 years ago but was run with a fixed pitch. This is the first time with a C/S prop. The mechanic had passed away a few years ago. I am thinking something was overlooked at overhaul. I know the same case was used.
I put 80 pounds of air in the fitting behind the prop to get some pitch change (per prop shop) and it would change but not very much. Most of the air was just going into the case. Sounds like all of the oil from the governor is just going back into the case. Has anyone had a similar problem?