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[TowerTalk] Removing Prop-Pitch Motor Locking Ring

To: <>
Subject: [TowerTalk] Removing Prop-Pitch Motor Locking Ring
From: (
Date: Wed, 3 Oct 2001 00:13:12 EDT
In a message dated 10/2/01 7:09:26 PM Pacific Daylight Time, writes:

> Does anyone out there have a proven way to remove the threaded locking
>  ring which secures the electric motor to the lower gear housing on a
>  prop-pitch motor?  All of the previous P-P's I've had experience with
>  had the retaining ring secured by peripheral bolts and was obviously
>  very easy to remove.  This one has a threaded ring which has an ominous
>  decal nearby on the housing which says "tighten to 250 to 300 foot
>  lbs.!!  (They must have only had gorillas in the AAF to work on these
>  things!).
>  I've got a spanner wrench which I believe was recommended in a post a
>  long time ago, but this doesn't even begin to turn the ring.  Using a
>  drive punch with a hammer looks like it would destroy the key slots
>  which obviously I don't want to do.  It seems like the only way to
>  remove this ring is with the proper tool and a VERY large gorilla!
    Well - YEAH!

    The only method I've seen has been to use a small chisel or screwdriver 
to tap the ring off. If you gouge the slots, just file them with a round 

    These transmissions and motors were used to change the pitch of the 
propellors of WW2 airplane engines; the B-29 version plentiful and popular so 
there's a reason why their specs are BIG. I can't even imagine how much 
torque they had to hold and change. 

    You know all those pictures of WW2 planes with their propellors turning? 
You know that can on the front of the propellor? That's the motor for the PP. 

    If anyone's got one for sale, let me know - I'd be interested in it. 

Steve      K7LXC
Tower Tech  

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