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Re: [Mgs] Generator woes continue

To: Barney Gaylord <barneymg@mgaguru.com>
Subject: Re: [Mgs] Generator woes continue
From: Simon Matthews <simon.d.matthews@gmail.com>
Date: Sat, 16 May 2009 15:54:37 -0700
Barney,

Using this information, I was able to easily remove the old bearing. I
also used your trick to force oil into the bearing (amazing my son at
the same time).  Many thanks.

I also want to thank Pete Chast, who suggested freezing the new
bearing -- this worked very well: the new bearing just dropped into
place. I had prepared the rear plate in a vice, found a suitable piece
of wood and hammer with which I planned to drive the bearing into
place. Wearing nitrile gloves (to reduce the amount of heat
transferred from my fingers into the bearing, I removed it from the
freezer, placed it in the late and, before I could pick up the wood
and hammer to drive it in, it just fell down into place.  I assembled
the generator using the front plate and armature off a spare generator
that has the blade connectors.

I replaced it on the car and, after running for a couple of minutes in
the garage, there is no sign of heat buildup in the generator.

Next question: how to R&R the front bearing?

Simon

On Sat, May 9, 2009 at 11:07 PM, Barney Gaylord <barneymg@mgaguru.com> wrote:
> At 08:04 PM 5/9/2009 -0700, Simon Matthews wrote:
>>
>> ....
>> On Sat, May 9, 2009 at 4:52 PM, Barney Gaylord <barneymg@mgaguru.com>
>> wrote:
>> > At 02:00 PM 5/9/2009 -0700, Simon Matthews wrote:
>> >> ....
>> >> .... the rear bearing was worn through. How does one R&R the bronze
>> >> bushing in the rear plate?
>> >
>> > Screw a thread cutting tap into it and pull it out.
>>
>> Any idea what size this is? I have a set of taps, but nothing that big, so
>> I will have to buy a new tap.
>>
>> Any comments on pushing in the new bushing?
>> ....
>
> I just pulled one out to measure.
> Generator rear shaft is .590" dia. (15 mm)
> The bushing is thin wall sintered bronze,
> .592 ID x .714 OD x .88 Long.
>
> Thr tap can be 5/8-in or 16-mm.  I just screwed in a 5/8-18-UNF tap.  When
> it hits bottom keep turning, and the bushing will come out easily without
> pulling.
>
> The bushing is only 1/16" thick when new.  If it is seriously worn very thin
> you can pick one side with a knife point or ice pick to bend it inward away
> from the housing bore and pull it out with a long nose pliers.
>
> Being thin wall bronze the new one will press in easily, or tap gently with
> a light hammer and flat nose punch.  Try not to make a burr on the end of
> the bushing.  After installation, insert the armature shaft into the bushing
> and turn it to be sure it will run free.
>
> Barney
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