Thrust washers

[joolz6]

Hello

I am hoping that someone can help me ! I am rebuilding my 1955 AJS model 20 and dont know which way the trust bearings fit ( whoever built it before did not refit any ) Do the grooved sides fit against the centre web ? or sit facing the conrods ?

Many thanks

John

[joolz6]

Hello can anyone tell me which way the trust washers are supposed to fit ? They are grooved on one side . So does the groove side fit on the centre web side or on the conrod side ? Whoever built the engine years ago did not fit any !!! Its a 1955 AJS model 20.

Many thanks

two topics merged - moderator

[g80csp11]

groove faces the crankshaft ie away from the center web. the grooved face is the running surface

Thrust orientation.jpg

[joolz6]

Can anyone tell me why there seem to be two sizes of the centre web on the model 20 ? Both the webs have the same part number ( 013776 ) stamped on them . the parts book number is 015670. One web has the groove for thrust washers ( which i bought a new pair from the club ) but when i fit them there is too much space for them to stay in place ie total width 22mm with the thrust washers fitted. I was told this was the right one for my 1955 model 20 The other centre web i have ( which came fitted to the bike when i bought it ) has no groove for the trust washers but when the centre shells are fitted ( both shells have a lip on either side of them to fit slightly of the sides of the web ) they are a perfect fit ! and there is no slack when fitted the the crankshaft I cant seem to buy these type of shells . Any help would be great !

[Duncan]

It sounds like you have an earlier type of crankshaft assembly, this changed during 1951 if you look at the parts list for that year you can see both listed, http://archives.jampot.dk/book/Spares_l ... _twins.pdf

[joolz6]

Thanks Duncan !!!!! This it what i thought !! Looks like i bought a lot of parts that i dont need !!!! and looking at the book you just sent this is why i also have these two washers fitted ( Part number 011542 ) Ok i will have to search now and try to find the bearing shell part number 011547 .

Thanks for getting in touch and hopefully i can get on with fixing this old bike back up !!