Morris Minor Owners Club

What sealant would be best to use when sealing down the gearbox cover plate?
Would normal black rtv sealant do?

I would use a paper gasket and maybe a smear of blue Hylomar.
RTV will be a pig to remove later, it has no place on engine/gearbox parts IMHO.

Phil

I don't think he's talking about engine or gearbox parts I would use a body caulking strip I think.

Ah yes, I jumped to the conclusion it was the one on the actual gearbox.

For the sheet steel gearbox floor cover I used this stuff.
https://www.ebay.co.uk/itm/Neoprene-Str ... 2749.l2649

Phil

If the cover plate was that fitted to the side of the gearbox there is absolutely no need form any form of sealant. Just lightly smear both sides of the gasket with grease and fit. It keeps the gasket supple and allows the gasket to be easily removed and re-used if necessary.

If the cover plate was that fitted to the side of the gearbox there is absolutely no need form any form of sealant. Just lightly smear both sides of the gasket with grease and fit. It keeps the gasket supple and allows the gasket to be easily removed and re-used if necessary.

That's an interesting tip Phil, one I shall make a note of.
On the gearbox that I was going to use but which turned out to have jammed gears someone had stuck all the gaskets in place (including the front one around the first motion shaft) with silicone sealant, it was a right pig to clean / scrape it all off, so I could replace the gaskets. It also looked a complete mess.
And then after all that it needs repairing. Fortunately I have a spare.
Perhaps I should have taken the 'silicone splurge' as a sign and left it alone.....
Best wishes,
Mike.

jagnut66 wrote: ↑Mon Jun 29, 2020 10:34 am

If the cover plate was that fitted to the side of the gearbox there is absolutely no need form any form of sealant. Just lightly smear both sides of the gasket with grease and fit. It keeps the gasket supple and allows the gasket to be easily removed and re-used if necessary.

That's an interesting tip Phil, one I shall make a note of.
On the gearbox that I was going to use but which turned out to have jammed gears someone had stuck all the gaskets in place (including the front one around the first motion shaft) with silicone sealant, it was a right pig to clean / scrape it all off, so I could replace the gaskets. It also looked a complete mess.
And then after all that it needs repairing. Fortunately I have a spare.
Perhaps I should have taken the 'silicone splurge' as a sign and left it alone.....
Best wishes,
Mike.

Going slightly off topic I have been researching the best way to rebuild a 1275 gearbox and noticed a few people mention the addition of a spacer (washer) to the selector rod in order to stop the gearbox over selecting gears and thus jamming them in position.
The spacer stops the gear from sliding over the indent which pops out and jams the gear in place.

That could be the issue with your box Mike.

Regards
Dermot.

Going slightly off topic I have been researching the best way to rebuild a 1275 gearbox and noticed a few people mention the addition of a spacer (washer) to the selector rod in order to stop the gearbox over selecting gears and thus jamming them in position.
The spacer stops the gear from sliding over the indent which pops out and jams the gear in place.

That could be the issue with your box Mike.

Regards
Dermot.

Thanks for the suggestion Dermot, I will check out that possibility.
That box is on the bench, awaiting me having time to pull it apart and take a look, which will be after the car is back on the road now......
All being well with the other box. It seems okay, fingers crossed.....
Best wishes,
Mike.