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Replacement bushings for A-can Mura endbells?


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#1 Tom Katsanis

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Posted 03 June 2018 - 06:08 AM

Hi I have an old A can mura motor that has a white endbell with brass hoods & plates everything seems fine on it except the bushing on the endbell has some slop in it.

Doe's anyone know if there is replacements available or if a bushing off a more modern motor can be used.
Thanks Tom




#2 havlicek

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Posted 03 June 2018 - 06:57 AM

Hi Tom,

     The Mura 16D ("A") can motors are probably more difficult to get than any of the others.  As with all these old motors, the end bells went bad first, although in the case of the Mura, with it's much better material, the bushing was really what went most often from sheer wear.  Aside from an individual who may have some NOS parts or end bells, I think the only choice is to have a bushing turned down from a larger one.  From what I remember, I think the factory bushing was ribbed or knurled on it's outside, but a bushing turned for a tight fit should be fine.


John Havlicek

#3 Tom Katsanis

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Posted 03 June 2018 - 07:20 AM

Thank you John I will see if I get lucky but I will probably end up getting something turned down.
Tom
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#4 Pablo

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Posted 03 June 2018 - 01:08 PM

If you can show me a photo and give me exact measurements I can probably help.


Paul Wolcott

#5 Bill from NH

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Posted 03 June 2018 - 04:29 PM

Mura B-can endbells & early C-can endbells used the same bushing as the Mura A-can.


Bill Fernald
 

How old should a highway be before you tell it, that it has been adopted?


#6 Tom Katsanis

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Posted 03 June 2018 - 04:44 PM

Thanks Pablo your help will be appreciated it will be a day or two before I can get a measurement (will have to take it in to work)but I will post something as soon as I can.
Thanks Bill good to know if I get stuck I will try to find a c can one to fit but any c can I have that I can currently sacrifice suffers from the same problem.
Tom

#7 Tom Katsanis

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Posted 04 June 2018 - 02:06 AM

I have not been able to get the bushing out to take a good measurement but measuring it inside the endbell it looks about 145 thou wide were it sits in the endbell 120 thou deep & 220 thou were it steps out.

Sorry about my photos the camera on the back of my phone is scratched to the point photos are fuzzy so have to use the selfie camera.
I included a photo with a c can I have which has a bigger bushing than the A can in my examples anyway.
So not sure where to go with it the can on this motor looks pretty beaten it's had holes drilled in it's sides & the vent holes enlarged roughly in the can & the magnet shim but otherwise it seems to have real strong magnets & it came with an ncc22 tagged arm that the guy who trued the comm on it reckons has barely been run.
Tom

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#8 Pablo

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Posted 04 June 2018 - 07:52 AM

I can't tell anything from the photos, and I have no idea where you measured at.

I suspect it may simply be a standard FT16D bushing, which are common.

 

But before I send you one, these are the measurements I'd need to make sure:

 

Diameter of the bushing - the part that goes into the EB:

 

IMG_9643.JPG

 

Length of the bushing without the flange:

 

IMG_9645.JPG

 

Overall length including flange:

 

IMG_9646.JPG

 

OD of the flange:

 

IMG_9651.JPG


Paul Wolcott

#9 Bill from NH

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Posted 04 June 2018 - 08:02 AM

Tom,  to remove that bushing from the endbell use a small punch, a nailset, or even a small nail & gently tap with a hammer. The bushing will fall right out for measurements.

 

While the motor is apart, you could use small files to cleanup the can's burrs, solder sanded flat for body filler (if needed), & a fancy new paint job of your color choice.


Bill Fernald
 

How old should a highway be before you tell it, that it has been adopted?


#10 Tom Katsanis

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Posted 04 June 2018 - 05:37 PM

Ok I got the bushing out & took some measurements the bushing is splined the id of the hole in the endbell once the bushing is removed is .1600 in.
The od of the splined bushing is .1685 in, bushing length not including flange is .1200 in & od of the flange is .2195 in.
Thanks Tom

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#11 Pablo

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Posted 04 June 2018 - 08:09 PM

That's really strange, the bushing is .1685 and fits into a .160 hole.

Sorry, I tried, but I don't have one of those.


Paul Wolcott

#12 Tom Katsanis

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Posted 04 June 2018 - 08:18 PM

Yeah no worries Pablo I will try & work something out.
Thanks Tom

#13 Bill from NH

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Posted 04 June 2018 - 08:39 PM

The bushing is pushed into a slightly smaller hole so the splines will have material to grip & compress. The compressed plastic doen't stay fully compressed once the bushing is removed. Otherwise, the factory would have to glue the bushings into place.

 

That's the same reason why a tap drill bit is always a smaller diameter than the tap.


Bill Fernald
 

How old should a highway be before you tell it, that it has been adopted?


#14 Tom Katsanis

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Posted 04 June 2018 - 09:40 PM

Ok I maybe have a solution although not the best the hole in the endbell was .160 in converted to mm it is about 4.06 mm so I googled 2mm x 4mm oillites & found lots available so I have ordered one & I will see how that fits.
Thank you Pablo & Bill for your help.
Tom

#15 boxerdog

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Posted 04 June 2018 - 10:10 PM

Might just work!


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#16 Tom Katsanis

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Posted 05 June 2018 - 12:43 AM

I hope it does I would prefer to use this endbell rather than a normal 16d style one.
Tom





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