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#704003 - 08/05/17 12:35 am Transmission High Gear Bushing  
Joined: Aug 2001
Posts: 118
Phil R Offline
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Phil R  Offline
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Joined: Aug 2001
Posts: 118
SoCal
While inspecting the high gear assembly on a 1970 TBolt I noticed that the bushing appeared cracked on the outer portion.
I pulled out another from a parts box & found it to be cracked as well.
After researching the problem I discovered that this bushing is of the split variety and that replacements are actually available, if needed.
But a new question arose when I discovered that the two bushings differed greatly in the distance that they extended from the end of the assembly (see photo).
Is there a prescribed amount for this distance or is it set up for each individual transmission? Any insights appreciated.

Phil

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#704004 - 08/05/17 12:39 am Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: Aug 2001
Posts: 118
Phil R Offline
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Phil R  Offline
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Joined: Aug 2001
Posts: 118
SoCal
Sorry, looks like there are still some things I don't understand about "Attachment Manager" !

#704023 - 08/05/17 8:13 am Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: Sep 2008
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jaycee Online content
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jaycee  Online Content
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Posts: 722
angeles city, rp
if it helps any the one on the right looks correct. its possible the one on the left could have broken off as a groove gets worn there from the seal thats in the plate behind the clutch basket. i replaced a set of bushes in a '65 tears ago but ill be damned if i can remember what the spacing was. I WANT TO SAY (but not sure) that those bushes, and there two, press in til they but up to each other and the result is the correct protrusion. i DO remember they required a light reaming afterwords.

#704030 - 08/05/17 10:21 am Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: Aug 2001
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gavin eisler Offline
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gavin eisler  Offline
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argyll. scotland, uk
The bush needs to extend enough so that the oil seal in the primary case has something to run on, not critical , just long enough and a wee bit more.
When I replaced these bushes I had to ream them to get a running fit, used an expanding reamer.


71 Devimead A65 750
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#704090 - 08/06/17 3:14 am Re: Transmission High Gear Bushing [Re: gavin eisler]  
Joined: Aug 2001
Posts: 118
Phil R Offline
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Phil R  Offline
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SoCal
Jaycee, Gavin, Thanks for the input, that's just the information I was hoping to find.
Much appreciated!

Phil

#704096 - 08/06/17 7:34 am Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: May 2013
Posts: 4,575
Allan Gill Online happy
Allan Gill  Online Happy


Joined: May 2013
Posts: 4,575
Rotherham - S. Yorkshire
Interesting, out of the 3 boxes I have the high gear bushes do not touch in the centre. Unless it's seriously worn I wouldn't bother.


beerchug
#704134 - 08/06/17 4:10 pm Re: Transmission High Gear Bushing [Re: Allan Gill]  
Joined: Aug 2001
Posts: 118
Phil R Offline
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Phil R  Offline
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Joined: Aug 2001
Posts: 118
SoCal

[quote= Unless it's seriously worn I wouldn't bother. [/quote]

I think we're both on the same page Allan.

Thanks

Phil

#704162 - 08/06/17 10:14 pm Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: May 2013
Posts: 4,575
Allan Gill Online happy
Allan Gill  Online Happy


Joined: May 2013
Posts: 4,575
Rotherham - S. Yorkshire
bigt if the gap is big enough to leak a highly viscous gearbox oil then it is goosed


beerchug
#704229 - 08/07/17 4:16 pm Re: Transmission High Gear Bushing [Re: Phil R]  
Joined: Jan 2004
Posts: 3,543
DMadigan Offline
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DMadigan  Offline
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Posts: 3,543
ca, us
The high gear bush sticks out about 0.350" from the gear and no, the two do not meet in the centre.

#704396 - 08/09/17 5:59 am Re: Transmission High Gear Bushing [Re: DMadigan]  
Joined: Aug 2001
Posts: 118
Phil R Offline
BritBike Forum member
Phil R  Offline
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Joined: Aug 2001
Posts: 118
SoCal
Roger that info Dave, thanks much.
Neither of the two I have meet up in the center. If need be, I plan to adjust the gap just slightly so that the seal will run on an un-worn surface of the bush.

Phil


Moderated by  Allan Gill, Jon W. Whitley 


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