[GreenKeys] M28 skintight motor questions

[DR HOUSE]

Chris,

I always thought the motor unit on a "skintight" was the same as the  
standard.
Obviously it is not.  I have to look up the documentation on the LMU-3.
I have three "Compact" 28KSRs here. One is civilian and two are  
military.
I also have a spare motor unit for them.  THEY ARE different as all of  
the
electrical components other than the motor itself are on the side of  
the motor
mount rather than under the motor.

"More as I get to it and it happens"

Don


On 15 Jan 2012, at 4:27 PM, Chris Elmquist wrote:

Gang,

Finally getting some time to work on the M28 "skintight" that I acquired
last summer over 4th of July weekend.

The main driven gear has a flat worn on it so I removed the motor to
get to that and while I had the motor out, looked it over and spun it
by hand.  It spins freely and coasts for a while so I powered it up.
Runs OK except for a gawd awful screech...  just like a police siren.
Bearings are probably not too good.

While looking for oilers, of which I found none...  I also found that
the rubber bushings that isolate the motor from the mount are pretty
well shot.  One has the appearance of melting while the other is rock
hard and cracking.

Photos here,

https://picasaweb.google.com/117891262011490779403/M28skintight?authuser=0&authkey=Gv1sRgCOmKpKLzxtnBiAE&feat=directlink

It doesn't seem like these bushings are easily removed from this  
motor...
are they normally a replaceable part?

And then the lack of oil ports is very puzzling.  Was this intended to
be an oil free motor?  One photo shows the motor p/n which is 151795.
Another of the photos shows what could be an oil port but the casting
is completely solid there with no hole...

Do I need to replace the motor to get new bushings or ???

Thanks and 73,

Chris N0JCF

-- 
Chris Elmquist

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