Thrust washer or ?

[WozzA]

 ????   Trying to identify this washer...  it's about 3/16" thick...
IF it's the Layshaft Thrust Washer PN#67-3203
its actually a smaller diameter than the lay shaft... does it have to be heated to expand it to install over the shaft ??? 


Cheers  WozzA

[bsa-bill]

It's not the layshaft thrust washer Wozza, the thrust washer has an internal chamfer on one side and slides on the layshaft with out heat , I think? they come in different thickness but not I would reckon as much a 3/16.
Whats annoying is I'm sure I know what that washer is for

[beezermacc]

Hi Wozza, This is definitely not the thrust washer which is a nice snug fit inside the dogs of the layshaft sliding gear and is only about 1mm thick. I'm sorry but I don't immediately recognise the part. There are a few things it is similar to and worth trying; distance pieces on either the front or rear wheel spindles depending on which wheels you have or the press fit collar on the back of the advance and retard unit. I can't remember anything like this coming out of an A10 gearbox. I'm assuming you are trying to identify something from a box of bits? Happy New Year!

[WozzA]

Thanks guys... at least I now know what it isnt....   
Your right on the money beezermacc, I got tubs of bits & pieces, & just to chuck a spanner in the works not all are a10..
back into the ice cream container it goes 4 now..    ( untill I am missing it from somewhere else..   LOL )   

Cheers WozzA

[lowbrowbsa]

 it may be a spacer for the front sprocket  ????maybe to line up the clutch and main shaft of th engine just a thought

[kiwipom]

hi guys/Woz, found this from an earlier post don`t know the date but may be usefull info, cheers, Bob.
dpaddock:
OK, here goes:
   According to the late John Gardner, Tech Officer of the GSOC UK, "There are four large hardened washers . . . , three on the layshaft and one behind the kickstart ratchet pinion bush . . .Unfortunately, the BSA Spares List illustration [Plate 5, A Group Plunger] does not show clearly the correct assembly.
   Working from the clutch end of the gearbox, the washers should be assembled on the layshaft in the following positions.
   Part number 42-3078 is fitted between the main gearbox shell and the layshaft fixed gear 'B'.
   Part number 67-3203 is fitted between the 'F' and 'H' gears.
   Part number 42-3079 is fitted between the 'H' gear and the middle cover.
   Part number 67-3161 is fitted behind the kickstart ratchet pinion bush."

The "Layshaft Thrust Washer", p/n 67-3203, located between the 'F' and 'H' gears, has the following dimensions;
     .093" (.115 ") thickness*;
     1.093" (1.248") O.D*.;
     3/4" I.D.
*The difference between the two numbers show the practical tolerance that I've experienced. The first number is John Gardner's, the other is what I have in my A-10 and/or Gold Star boxes.

   John goes on to say "Pay particular attention to the washer part number 67-3203 which is also used on the gearboxes fitted with bronze layshaft bushes. The bore of the washer often . . . has a chamfer on one side only. If this is the case, the washer must go onto the layshaft with the chamfer against the spline, to give clearance for the small radius on the shaft at the start of the spline."
   

[WozzA]

Thanks for your input Bob... it's all very confusing to me  I better get someone who knows what he's doing to have a look 4 me.
I have to go into Modak in a week or 2 for some parts so I will take the box in with me..  

[WozzA]

FOUND IT....  it's the CRUSH DRIVE distance piece# 67-1138

lowbrowbsa gets the cigar...  Thanks for your help again guys..  

Cheers WozzA

[bsa-bill]

Hold on Wozza you got me confused (granted not too difficult)

It's smaller diameter than the layshaft so where does it fit on the cushdrive, is that clutch type cushdrive or the crank cushdrive

[chaterlea25]

Hi All,
Kiwipoms post mostly refers to the "T" type gearbox which has needle roller bearings on the layshaft
ie. STD T , RR T , SC T  etc

HTH
John O R

[WozzA]

   LOST IT AGAIN  I was looking at page 14 of the A Model SPARES book ...  your right it's a much smaller diameter.. BUGGER..   

[lowbrowbsa]

bugger i had the cutter and matches ready to go hahahah