Gearbox cross member bolts

Post by **Dominic** » Tue Aug 26, 2008 8:04 pm

Hi folks

Just sheared off a gearbox cross member bolt head - Can anyone please tell me what the bolt thread size is for this location? Also, does anyone have any idea what thread is used for the brass screws holding gearbox cover floor in place?
Thanks,
Dom

Post by **bmcecosse** » Tue Aug 26, 2008 8:22 pm

The gearbox X member bolts screw up into 'captive' nuts in the chassis legs. Dunno the thread - can you not take another one out (carefully) to find out ? But since you will need to drill/tap a new thread in the hopefully still 'captive' nut - or - release that nut and fit another, then the old thread doesn't matter much! the brass screws are a strange thread - don't know it either although distant memory suggests UNC thread which in that size (3/8"?) will be near enough same as Whitworth.

Post by **Dominic** » Tue Aug 26, 2008 11:14 pm

Thanks BM, appreciated!

Post by **mike.perry** » Wed Aug 27, 2008 1:12 am

I replaced all the gearbox cover brass set screws with 7/16 A/F head bolts. A lot easier to undo with a socket and ratchet.

Post by **simmitc** » Wed Aug 27, 2008 1:36 pm

Gearbox cover screws to floor are brass 1/4 inch BSF. Ideally crosshead but many new parts are straight slot. Advantages to both. I think that the X member bolts are 5/16 UNF.

Post by **polo2k** » Wed Aug 27, 2008 2:03 pm

for the brass screws I found that a cordless drill was a godsend!

Post by **bmcecosse** » Wed Aug 27, 2008 4:32 pm

As small as 1/4" ?? Seem to remember them larger - and yes - a drill sorts them out if they don't unscrew easily.

Post by **Alec** » Wed Aug 27, 2008 7:15 pm

Hello all,

yes, i also go for the cross member bolts being 5\16" BSF.

Alec

Post by **Dominic** » Wed Aug 27, 2008 7:27 pm

Thanks for the info folks, much appreciated

Dom.