moggie boxes
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moggie boxes
I have got 2 boxes the ribbed type, I want to change the one in my 948cc which whines in top gear. On checking through the side plate I can see that the reverse gear is chipped in both boxes. Is this usual, Ist it worth just replacing the reverse gear, if I can pluck up the courage to take one apart.
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- Minor Legend
- Posts: 1466
- Joined: Sat Aug 11, 2007 12:06 pm
- Location: Livingston Scotland
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Are you sure it's chipped and not just slightly worn on the leading edges of the teeth? This is quite common and not really much to worry about. They wear on the leading taper as they mesh with 1st gear which is a straight cut gear. As long as 1st gear is OK and reverse gear is not chipped on the main section of the teeth, they should be good.
That said, reverse can be replaced without total strip down.
That said, reverse can be replaced without total strip down.
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- Minor Legend
- Posts: 1466
- Joined: Sat Aug 11, 2007 12:06 pm
- Location: Livingston Scotland
- MMOC Member: No
A single chipped tooth on leading edge of reverse is nothing to worry about. I would go with that box and leave well alone, considering that some 'new' replacement parts are of dubious quality. Replacement involves removing the remote housing, side cover, reverse detent ball spring and plunger, reverse selector fork, reverse gear idle shaft, and then fiddle the old gear out through the side cover hole.Please tell me more, It is just the very edge of the teeth, one box it is a single tooth, the other it is all the teeth, both on the small cogs, the other cog looks ok.
Re-assembly is difficult but possible, without removing the laygear etc.
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http://www.freewebs.com/moggytech
http://www.freewebs.com/moggytech
I have had a closer look at both boxes today, The one with the single chipped tooth is not as smooth to turn as the other one. The chipped tooth is almost half the length of the gear. The other box is much smoother to turn and all the teeth are chipped but just on the corners. The only other unknown quantity is the state of the synchros. I might just try the second box when the weather gets warmer and keep my fingers crossed. My mate wants a clutch in his moggie so I might have a summer hefting engines and boxes in and out. Thanks for your input.A single chipped tooth on leading edge of reverse is nothing to worry about.
Or - just use a swing!
Thanks to Badfelafel for the picture - and for letting me play with his engine!
But if the 'chip' is half the length of the tooth - well that's more than a chip! Inspect the little dog teeth on second gear carefully - that's the one that takes the most punishment. That box may just need to be flushed over with oil to make it turn nicel - give it a try - and then see how it turns.
Thanks to Badfelafel for the picture - and for letting me play with his engine!
But if the 'chip' is half the length of the tooth - well that's more than a chip! Inspect the little dog teeth on second gear carefully - that's the one that takes the most punishment. That box may just need to be flushed over with oil to make it turn nicel - give it a try - and then see how it turns.
we bought an engine crane off ebay, although I have used a similar set up to the swing in my youth. With the radiator and front panel off access looks to be the best I have ever had, shoe horns not required. My mate reckons he knows a bloke who lifts moggie engines out with a rope slung round his shoulders. I have never met him and if its a dark night I don't want to.
Up date. The box with a single chipped tooth on reverse is no good. When I removed the selectors I could see excessive wear on the other cog. The second box is much better, just a bit of wear on reverse gear..Have ordered a seal and bearing rebuild kit, a reverse gear and 3 synchro baulk rings for the sum of £94 delivered. The seal and bearing kit includes gasket set 3 indents 3 needle rollers 2 ball races a layshaft, reverse gear shaft and tailshaft oil seal. I have stripped the box without excitement and will rebuild it and have change out of £100
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- Minor Friendly
- Posts: 75
- Joined: Mon Jan 21, 2008 11:19 pm
- Location: Buxton
- MMOC Member: No
The wagon driver at work has changed moggie engines by the "straight lift" aproach in the past - rope over his shoulders, straighten up, and out it comes...
It must be nice having cars where that is (just) possible. I can just lift a landrover gearbox onto an engine - the engines are the best part of a quarter of a ton, so its a crane (or tractor with a loader) job...
It must be nice having cars where that is (just) possible. I can just lift a landrover gearbox onto an engine - the engines are the best part of a quarter of a ton, so its a crane (or tractor with a loader) job...