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Damaged Gears!
https://www.ausmini.com/forums/viewtopic.php?f=2&t=85213		 Page 1 of 2
Author:  Minimadmarty [ Thu Apr 10, 2014 1:47 am ]
Post subject:  Damaged Gears!
After finally pulling my gearbox apart I have removed most of the gears and bearings from the motion shaft. On inspection most of the cogs look good, no damage, no pitting except two!

The first one I think is part of third gear! One tooth has snapped! Plus I can't get the pegs or plunger things in to remove the thrust washer! Any suggestions?

Image


Secondly the Final drive pinion has three teeth in a row damaged! Where's the best place to find replacements of these two parts?

Image

P.S. They are clean, it's the light that make them look rusty!!

P.P.S. The baulk rings all look fine, should I replace them as a matter of course?
Author:  TheMiniMan [ Thu Apr 10, 2014 7:33 am ]
Post subject:  Re: Damaged Gears!
To be honest , if the rest of that 3rd gear is like all the other teeth, & only that one dog has chipped off
then i`d re-use it, shouldn`t be an issue at all
the pinion doesn`t look too bad either really, but i can`t really see the whole thing so it`s a bit hard to tell,,, ive seen way way way worse in a mini & still going ok
Author:  drmini in aust [ Thu Apr 10, 2014 7:40 am ]
Post subject:  Re: Damaged Gears!
Pinion damage is often caused by people when using a cold chisel to flatten the locktab. You need to be careful to keep pressure off the teeth, they are brittle.
I's use the 3rd gear but find another pinion, and a crownwheel too if it's marked.
Author:  John Smidt [ Thu Apr 10, 2014 8:44 am ]
Post subject:  Re: Damaged Gears!
With Regards to the pinion, The crown wheel is not as wide as the pinion
You should be able to see where the two have meshed, if the damage is
outside of this area, then I would suggest You can use it without problems.
In my opinion when ever a gearbox is rebuilt care should be taken to mesh
the crown wheel and the pinion back the way they have been running before,
Some people may disagree with this,
the other thing I noticed is the amount of teeth on the pinion
I cannot remember if You mentioned what car this is going in
Author:  Minimadmarty [ Thu Apr 10, 2014 10:02 am ]
Post subject:  Re: Damaged Gears!
Cheers guys great advice :D
Author:  Minimadmarty [ Thu Apr 10, 2014 10:11 am ]
Post subject:  Re: Damaged Gears!
drmini in aust wrote:
Pinion damage is often caused by people when using a cold chisel to flatten the locktab. You need to be careful to keep pressure off the teeth, they are brittle.
I's use the 3rd gear but find another pinion, and a crownwheel too if it's marked.



Looks like I'll need to find a new pinion I suspect you are correct, I think it could have been my Neanderthalic removal that caused the damage! The crown wheel is fine.
Author:  Minimadmarty [ Thu Apr 10, 2014 10:14 am ]
Post subject:  Re: Damaged Gears!
John Smidt wrote:
the other thing I noticed is the amount of teeth on the pinion
I cannot remember if You mentioned what car this is going in



The pinion has 15 teeth and the gearbox is going onto a 1275 that I'm attempting to rebuild! That will be fitted to my 78' Leyland.
Author:  drmini in aust [ Thu Apr 10, 2014 10:56 am ]
Post subject:  Re: Damaged Gears!
If it's only 15T, the diff ratio is either 4.13 or 4.26.
Way too short gearing for a 1275 in a road Mini, IMO.

I'd look for a 3.44 (18T/62T)
Author:  Minimadmarty [ Thu Apr 10, 2014 11:20 am ]
Post subject:  Re: Damaged Gears!
drmini in aust wrote:
If it's only 15T, the diff ratio is either 4.13 or 4.26.
Way too short gearing for a 1275 in a road Mini, IMO.

I'd look for a 3.44 (18T/62T)



Thank you :D
Author:  drmini in aust [ Thu Apr 10, 2014 11:26 am ]
Post subject:  Re: Damaged Gears!
Just about every rodchange box (except Moke) had a 3.44 diff in it.
Fit pot joints whilst you're about it.
Author:  John Smidt [ Thu Apr 10, 2014 6:20 pm ]
Post subject:  Re: Damaged Gears!
drmini in aust wrote:
If it's only 15T, the diff ratio is either 4.13 or 4.26.
Way too short gearing for a 1275 in a road Mini, IMO.


This is why I mentioned the Pinion to You, with 10inch wheels
it will get of the mark quick, but will run out of legs pretty quick as well
There is one more ratio with a 15 tooth pinion that I can recall 4.33:1
so they are 15/62 15/64 15/65
4.13 4.26 4.33
Author:  Minimadmarty [ Thu Apr 10, 2014 8:39 pm ]
Post subject:  Re: Damaged Gears!
It's 15/64 (4.26) and I'm running 12 inch wheels.
Author:  Morris 1100 [ Thu Apr 10, 2014 8:59 pm ]
Post subject:  Re: Damaged Gears!
At 113kph you will be doing 5000rpm.
It is a silly diff for any road Mini.
Author:  Minimadmarty [ Thu Apr 10, 2014 9:03 pm ]
Post subject:  Re: Damaged Gears!
Morris 1100 wrote:
At 113kph you will be doing 5000rpm.
It is a silly diff for any road Mini.



What would people recommend?

Mostly daily driver with occasional highway runs
Author:  JimL [ Thu Apr 10, 2014 9:06 pm ]
Post subject:  Re: Damaged Gears!
3.44 will be the best compromise for a daily
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