Author Topic: Indian Scout gearbox 1926  (Read 431 times)

Offline john.k

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Indian Scout gearbox 1926
« on: May 11, 2018, 09:36:18 AM »
I have a 1926 Indian Scout gearbox apart,and the bearing behind the clutch drum is a tapered roller,and has had the outer race ground back to suit the space available.The bearing should be a angular contact ball,but must have a narrowed outer race.Dimensions are standard 35x72x17 for the inner race,but the outer needs to be 14 mm wide to fit in the housing.Maybe Ill just leave the taper roller in place,its been there for who knows how long......Where is the best place to get the correct bearing?

Offline Rex

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Re: Indian Scout gearbox 1926
« Reply #1 on: May 11, 2018, 10:05:56 AM »
If it really is 35 x 72 x 17 it's a 6207 and available just about everywhere including on-line. Are you sure it's a metric bearing though? My Chief is resolutely bearing-ed up with Imperial bearings.

Offline john.k

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Re: Indian Scout gearbox 1926
« Reply #2 on: May 11, 2018, 12:50:34 PM »
The inner race is 17mm wide ,but the outer race is only 14mm,and that is the space in the housing.The thin web inside the housing has already been broken away in parts,but with a taper roller that doesnt matter......Incidentally,the bearing should be a angular contact,not a plain ball.So far I havent got to the sprocket bearing,the nut is very tight,and is going to need a rattle gun.Assuming its right hand.I have the army Chief manual,and its not a great help........it doesnt mention that both clutch side threads are left hand,excepting the inside nut on the clutch body.

Offline friday

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Re: Indian Scout gearbox 1926
« Reply #3 on: June 20, 2018, 05:33:26 AM »
1925 to 27 the taper bearing is timken 19138 , 19283 , outer race is 14mm . this is available but no one uses them .
there are replacement BB which have the outer trimmed to suit . walkers and the guy in sweden
antiquebike .

there are 2 helical baskets , diff being the neck area where the bearing sits . shoulder if you want to call it anything I guess . .850" or .950" deep

I have original NOS bearing as a reference pre 1925 , its thrust but it can be replaced with one of the modern trimmed ones in stead.

over all width is 14mm (inline) but when reversed on it self over all width becomes 17mm = outer race facing one way and the inner facing other under thrust against each other . leaving the BB staggered ....17mm wide

the early BB or the taper need thrust washers.
the 101 replaced the bearing with 35 x 72 x 17 , right up to 1953
later bikes chief , 741 use radial bearing , HD use same BB

RH  thin bearing is used in velocette and landrover

« Last Edit: June 24, 2018, 02:10:04 AM by friday »

Offline friday

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Re: Indian Scout gearbox 1926
« Reply #4 on: June 24, 2018, 12:58:09 AM »
just to carify what I was trying to say with a pic .

this is pic of .950 neck , same depth all the way up to 1953 

the early neck is the same length but the cut section is .850 depth for 14mm bearing


Offline friday

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Re: Indian Scout gearbox 1926
« Reply #5 on: June 24, 2018, 02:08:28 AM »
this is the early bearing before the taper roller of 1925 - 27

this BB falls apart until it is in position . pic shows BB inline at 14mm , then the centre reversed making it 17mm but both races are offset to each other


heres taper  = https://www.bearinga.com/bearing/TIMKEN-19138-19283/
« Last Edit: June 24, 2018, 02:13:57 AM by friday »

Offline john.k

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Re: Indian Scout gearbox 1926
« Reply #6 on: June 24, 2018, 07:26:37 AM »
Thanks for the info...........if the taper roller is right ,Ill leave it there..........My finances dont run to Indians anymore,Im just sorting out some stuff for next weeks swapmeet.,and thought I might clean out the black sticky oil the gearbox had in it.....Its been in a crash,likely,one lug is broken,and the round face of the gearcase mount has been trimmed flat in one spot for some reason or other.Never the less,its still a complete Scout gearbox,gears in serviceable condition,as they say,and someone will need it.....Again,thanks for the info.