Is this an all synchro gearbox?

[AFC1886]

The initial message was deleted from this topic on 14 January 2013 at 20:21

[davepoth]

Is that a straight cut first? If it is then it's probably not all synchro.

[anonymous-user]

Bit tricky to tell from that pic with the selector bauks in neutral. Move one the the selector bauks into gear and see if there are brass syncro rings between it and the dog rings!


they are the thin brass knobbly parts in this pic:



(From you pic i'd say none syncro BTW)

[Scuffers]

davepoth said:

Is that a straight cut first? If it is then it's probably not all synchro.

being straight cut or not is irrelevant to if it's synchro or dog engagement.

[theconrodkid]

looks like a ford type 9,4 synchro,the brass bits are baulk rings and it,s only reverse that is straight cut.
looks like something is missing at the rear of the mainshaft

[Crease]

ok, shoot me down in flames here, but having never really 'explored' inside a gearbox

why is the inside red? is it to do with the gearbox oil? and if so, then why arnt the gears the same colour?

[pitstopete69]

thats not an all syncro jag box, just a std moss one.
its in 2nd in the pic.

oops, edit that. its neutral.

the one I have just rebuilt was also painted that colour. usually to seal the casting I dare say. was bits of paint everywhere in the geartrain, over the 40 years it comes off in the corners, bits of sand and casting flash float about and shag the syncros/bearings. was a mess.

Edited by pitstopete69 on Saturday 17th December 11:24

Edited by pitstopete69 on Saturday 17th December 11:26

[davepoth]

Scuffers said:

davepoth said:

Is that a straight cut first? If it is then it's probably not all synchro.

being straight cut or not is irrelevant to if it's synchro or dog engagement.

Well no, but having three helical gears and one straight cut does rather suggest that the first gear is expected to be crunched a little.

[Crease]

pitstopete69 said:

thats not an all syncro jag box, just a std moss one.
its in 2nd in the pic.

oops, edit that. its neutral.

the one I have just rebuilt was also painted that colour. usually to seal the casting I dare say. was bits of paint everywhere in the geartrain, over the 40 years it comes off in the corners, bits of sand and casting flash float about and shag the syncros/bearings. was a mess.

Edited by pitstopete69 on Saturday 17th December 11:24

Edited by pitstopete69 on Saturday 17th December 11:26

to seal it from what exactly? the oil it contains?

[Scuffers]

davepoth said:

Scuffers said:

davepoth said:

Is that a straight cut first? If it is then it's probably not all synchro.

being straight cut or not is irrelevant to if it's synchro or dog engagement.

Well no, but having three helical gears and one straight cut does rather suggest that the first gear is expected to be crunched a little.

like I said, makes no odds if the gears are straight cut or helical, that's not what defines the engagement.

if it crunches into gear your not listening to the gears, but the method of engagement, be it Synchro, dog, sliding gear, etc.

from the pic of that box (and it's not one I am familiar with) it's a 4 speed where 4th is straight though, so yes there are only 3 pairs of forward gears, the spur gear looks like reverse