EW Gearbox and Crankshaft Bearings

[hartleys1]

Can anyone help I am replacing the bearings in my EW gearbox and crankshaft.
My main problem is I need to
remove the kickstart ratchet is it screwed to the mainshaft, there is no
sign of keys, if so is it a right or left hand thread ?
Regarding the bearings they are SKF 6203 the outer race is designated 03
would replacements be C3 or are standard bearings ok.

I am also asking the same question regarding the crankshaft bearing timeing side
should I use a FAG 98305-c3 for the drive side.

I have not been able to locate a 62x30x21mm
wide bearing (available ones have a wider centre)the nearest is 20mm (SKF 4206ATN9)I will have to
use a spacer unless anyone knows a UK supplier.
Keith Hartley

[douglas1947]

Hi Keith,

I have recently put in new bearings in my 1930 350cc H3 engine (should be the same size of crankshaft / crank house:

62206 (double row ball bearing, 30x62x20 + shim) at drive side

98305/c3 (25x62x12) at timing side

I think it is no mistake to use a C3.

Michael

[Rojab]

Hi Keith,

Try Henderson Bearings.

https://www.hendersonbearings.co.uk/99206-ball-bearing-premium-brand-snr-30x62x13mm.html

https://www.hendersonbearings.co.uk/415481-30x62x21-rs-n-416476-brand-skf.html

Regards Ronald

[hartleys1]

Hi Ronald and Micheal
Thanks for your replies. I have contacted Hendersons bearings for more information for the 415481 SKF  bearing.
It does seem strange to find such an early British bike with metric bearings.
Thanks again Regards Keith

[hartleys1]

Hi
The 62x30x21mm is not available from Hendersons anymore they sent me an equivlent
 which was a single row they said they would amend their lists.
Keith Hartley

[Doug]

Keith,

Even back in the day the 30x62x21 was going obsolete. The SKF bearing list for Douglas' covering up to 1931 specified a 20mm wide unit and a 1mm shim for the outer race. SKF recomended a double row ball, self-aligning bearing. Today we use a double row roller, self-aligning. Initially the Continent lead in ball bearing design (Blin), so not surprising metric dimension became the norm. However Douglas did use a mix of metric and imperial sizes.

The kick start ratchet is threaded on, such that it is tightened when used. There should be some drilled holes in the face for a special peg spanner, if I remember correctly.

-Doug