REFLECTOR: Franklin Accessory Gears

[Laurence Coen]

John,

There shouldn't be wear between the gear and the housing under normal 
circumstances.  Check for proper alignment of the alternator and the drive 
pulley.  I think that bronze is the proper material to use for a shim.  If 
the bronze wears down you have to replace the shim.  If you use steel and 
the shim spins with the shaft the housing will wear.  Replace the shim or 
replace the housing? Your choice.  Think of the crank which is steel and is 
supported by soft bearing material.  Any wear that takes place is of the 
bearing not the crank.

Larry Coen
N136LC

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From: "John Dibble" <aminetech at bluefrog.com>
Sent: Friday, April 27, 2012 5:47 PM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: REFLECTOR: Franklin Accessory Gears

> During my last oil change I got a big surprise, finding a lot of metal on 
> my ADC oil filter screen.  This is a great filter and lets me see 
> everything that's filtered from my oil. A magnet indicates that it is 
> mostly steel.  There are shiny aluminum particles also.  My Franklin 
> mechanic told me that the gears are the most likely problem, so I have 
> removed them.  A local mechanic told me that the gears need replacing.  He 
> checked the cam and that looks good.  I sent the metal from the filter for 
> analysis so I can make a final determination if I need to look for any 
> thing else.  I took apart the alternator gear and there is wear between 
> the gear and the housing.  I want to install a shim washer between the 
> gear and the housing.  Bronze was suggested, but after seeing the wear, I 
> think bronze will get eaten up fast, so I'm thinking of mild steel.  Any 
> comments or ideas will be appreciated.
>
> John
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