REFLECTOR: Franklin Accessory Gears

John Dibble aminetech at bluefrog.com
Sat Apr 28 13:32:55 CDT 2012


On 4/28/2012 10:45 AM, Laurence Coen wrote:
> John,
>
> There shouldn't be wear between the gear and the housing under normal 
> circumstances.
Are you saying that the gear should not touch the housing?  Mine does 
and the bevel of the gear forces the gear against the housing making 
wear inevitable.

>   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.

That's the other area I'm concerned about.  I'm hoping the metal 
analysis will indicate if the bearings are wearing.
>   Any wear that takes place is of the bearing not the crank.
>
> Larry Coen
> N136LC
>
> --------------------------------------------------
> 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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