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  #21  
Old 05-07-2018, 07:07 AM
rvsxer rvsxer is offline
 
Join Date: May 2007
Location: Inver Grove Hgts, MN
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Originally Posted by cajunwings View Post
If acquiring a used part make sure the ?B? nuts are steel. Many of these lines were removed to comply with a old AD note (90-04-06) because of the aluminum ?B? nuts. Also the fittings on the on the governor drive and the nose of the crankcase need to be steel due to the working pressures involved.
The working pressure is only about 40-60 psi. If you connect shop air to the fitting on the nose case you can move the prop blades to high pitch with about 55-60 psi. The reason for the steel lines was because the aluminum ones were work hardening and cracking.
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  #22  
Old 05-08-2018, 10:57 AM
cajunwings cajunwings is online now
 
Join Date: Jun 2007
Location: new iberia la
Posts: 768
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Originally Posted by rvsxer View Post
The working pressure is only about 40-60 psi. If you connect shop air to the fitting on the nose case you can move the prop blades to high pitch with about 55-60 psi. The reason for the steel lines was because the aluminum ones were work hardening and cracking.
Aluminum does work harden and you can change the pitch in the shop with air at those pressures, but when its spinning inflight and biting the air it takes a lot more. In the base of the governor is a gear pump that takes the 70 psi engine oil pressure and boosts it up. Lycoming and Hartzell have led me to to believe it?s in the 300-400psi range.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
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