Synchro Checking

[PeterH]

(Circlip came off - brute force and ignorance. (yesterday's post))

I can't find anything in the manual about checking the synchro (baulk) rings. There is a figure quoted on internet for MG B of 0.020"  clearance when ring pushed hard home onto cone (back of ring to gear face). Presumably a similar figure is OK for our cars?

[Pete Lewis]

yes  sounds reasonable,,    no gap is well worn out

what is critical is the 55deg chamfer on the  teeth of the gear dog and sleeve and the ring, must be well defined to make the ring rock over 1/2 tooth out of line to baulk the change till synchronised

also the equal load on the sleeve balls and springs 

any crashing thats chimbled the well defined chamfer will loose synchro effort and crash part way through a change as the rotational forces are overcome from baulking and it lets you engage without synchronising ...more crunching .

if you can follow the extract from a rootes manual  below   most synchro follow similar designs

Pete