Gearbox fragments

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C

Chonker

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54
I'm part way though the process of removing my gearbox to replace what I thought was a noisy clutch release bearing. I've got the floor and seat box out and have just completed the step "drain the gearbox oil". The transfer box oil looked a bit old but fine, the gearbox oil had rather a lot of metal in it 🙁

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These are the larger bits, there was also a lot of glitter and the oil had a Goldy sheen to it.

Is there anything I could know that's useful from the shape of these pieces? How difficult is a rebuild? Is a recon gearbox affordable? Is there a 5 speed option I should consider?
 
Someone else may know better but from memory, those bits along with the yellow glitter will be synchro related.
They aren't hard to work on exactly but i guess it depends what's damaged. You need to take it out regardless so you may as well have a look inside before you make any decision.
Not aware of anything else that would fit but you can add an overdrive
 
Right bag of bits there, can see remains of 3/4 gear detent springs, possible remains of bearing cage. The goldy sheen will have come from damaged syncro cones.
Steamwally has some good videos on the you tube of LT 76 series gearbox overhaul.
 
Gearbox overhaul fairly easy, don’t need many special tools apart from HD circlip pliers, likely you won’t need to touch front output housing or transfer box and just main gearbox as tottot said you got the 3/4 gear synchro spring clips , there’s 3 in total but maybe other bits in there too, that explains the poor gear changing .
When I took mine out initially I managed without a crane with help , floors out , seat box out , and wood beam across doors and straps , even managed to carry it to back of garage ( has an overdrive too) , although I would not try that now.
 
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Made a start yesterday, managed to pull the gearbox out without disconnecting the exhaust or dropping the fuel tanks which was difficult! Had to take the rear prop off entirely, I think the plunging joint hasn't got the travel in it that it should have.

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Now sat in the bed waiting on me building a workbench to dismantle it on. I ran up the engine without the gearbox attached and the bad noise is still there 😞. Now thinking it's either clutch or starter related as a spark came out from the back end and I can't think how else a spark could be visible from behind the engine.
 
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Could be starter dog not retracting all the way and touching ring gear, bit of broken clutch spring, look for witness mark's when you strip clutch down.
 
Another thought. Did you have to disconnect an earth from the gearboxes? If you did, and it was the only proper one, then you might have seen a short?
 
Good start, it might be worth cleaning it up, a bit in situ , then you can start splitting into 3 big bits, makes a lot easier to manoeuvre to your new clean area bench

Keep the pics coming

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Took the clutch off, it looks okay as far as I can see, bit gungy in the bell housing. Also the starter spring looks intact.

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I managed to make a recording of the noise, this is exactly the sound I'd been hearing driving around, that seemed to be becoming more frequent (which I thought (or maybe hoped) was the clutch release bearing).

link to video recording
 
That's not good. On the one hand sounding like a big end but not continuous. I'd check the oil level, if it's low then I can imagine it sometimes suppressing the noise/sometimes not. Then drain it and see if there's metal. Possibly something happening under the timing cover, so is it louder front or rear?
 
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Don't think it's knocking, the clutch slave is loose so might be that moving about.

Made some progress this evening

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I tried to get the idle shaft out to split off the transfer box but assume I need to remove the drum brake first? I'm running into lots of weirdo fastener sizes, I assume whitworth?
 
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