Hi does anyone have any photos of gearbox gears where they mesh with each other as in what's good what's bad and what's acceptable or serviceable or is there a web site where there is a new gear next to an old or worn as a comparison, mainly what to look for on the synchromesh side of things as all my actual gears look ok



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Did i tell you that all my minis are 850's ?

If you are talking 4 synchro boxes, it's usually not gear tooth wear that is a problem, but drive dog wear where the synchro hub's sleeve engages the dogs on the gear. 2nd gear particularly. With worn synchros, the ends of the dogs round off, this shortens the dogs giving less engagement length between the two. Wear can then cause jumping out of gear.

In a 3 synchro box, the above is true, but also the 1st gear end of the cluster gear is prone to wear, check the faces of the teeth for wear through the hardening. Also chipping of these teeth where the 1st gear ring slides into mesh.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've got one of my gearboxes sitting at work & if I remember tomorrow I'll take a couple of photos to help demonstrate what a worn gearset looks like.

Brad

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During the day I work on English designed cars & on my own time I work on English designed cars....

http://rs1328.pbsrc.com/albums/w537/dal ... 0&fit=clip


Dave mini
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looks a mk2 cooper S casing

thanks drmini
great explanation makes total sense what you are saying
I have attached some photos of the worst areas with this just being a small section of each dog

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Did i tell you that all my minis are 850's ?

more photos

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Did i tell you that all my minis are 850's ?

drmini just for reference its a 4 syncro box rod change and was not crunching gears when running in the car

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Did i tell you that all my minis are 850's ?

But was it jumping out of gear?

Brad

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During the day I work on English designed cars & on my own time I work on English designed cars....

No Brad it was fine and not jumping out of gear. I pulled it down as i had an engine problem and I'm rebuilding the motor, so cleaning out the gearbox and gears to make sure there is no metal left behind and thought i would rebuild the box while i was at it.

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Did i tell you that all my minis are 850's ?

Thanks for the pics,
When new, the front face of all dogs is vertical and sharp, not laid back as in the pics.
So the engagement length is greater.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.