71B gearbox issue

[lampy]

Hi,

Im after some advise on my 71B hollinger 5 speed for my 1600 circuit car.

I had noticed some gearbox oil dripping from the bottom of the car at the end of the last event and when i put the car away in the shed i came back a few days later to 2-3 liters of oil on the the floor.

During the event the gearbox operated correctly and with no major unusual noises.

I pulled off the gearbox mount today and found the damage as shown in the attached photos. I am away for two weeks at work and have an upcoming tarmac rallysprint just after i get back. I would like to order the necessary parts to get going as a soon as im back

Has anyone seen this before. It looks to me like the dreaded 5th gear nut has come loose and the bearing has worn through the housing?

I thought i would have lost 5th and reverse in this case?

 

[C.A.R.]

I've not seen that before!

Rear Counter-shaft nut appears to have come loose, and that almost looks like the rear CS bearing poking through
It would have just walked 5th CS gear off the back of the shaft, the nut has dropped down into the bottom of the housing.
So my guess would be to replace the extension housing, bearing and nut.
Make sure the rear CS nut has Loctite applied to it during reassembly...
Take pictures of the disassembly! 

[lampy]

Thanks lurch. That’s what I was thinking. I believe it would have had the locktite treatment before assembly. 

Hopefully there is no damage on the gears.

replacing the extension housing is harder than normal as it has been modified with  exhaust brackets welded on and a temp sensor bung. 

 

[C.A.R.]

Ahhh I remember that extension housing!
I'd be finding someone who can Tig weld Alum...