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Old 21-08-2018, 12:51 PM   #16
benvvc
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Cheers for the input guys I haven't got round to it yet 14hr working days is killing me off at the moment. Hopefully sort it out at the weekend wen I have some time to myself lol
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Old 30-08-2018, 05:18 PM   #17
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I've put some pictures on Facebook 16v mini club as I can't upload on here.
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Old 30-08-2018, 08:29 PM   #18
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I've had a look through your photos and can't see anything wrong with the way you have put it together, there's nothing that jumps out and says I'm not in the right place, that is causing your problems. With the casing apart can you turn the input shaft and the gears turn the diff or are they locked?
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Old 30-08-2018, 08:45 PM   #19
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Cheers for the reply. I can turn the diff both clockwise and anti- clockwise no problem all the gears on the shafts rotate freely and nothing looked or sounded like there was a problem. I've got another box il split tomorrow afternoon and see eat differences there are. Must be a selector problem???
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Old 31-08-2018, 08:08 AM   #20
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When you put the top casing on did it just drop into place after you opened the circlip or did you have to force it?
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Old 31-08-2018, 05:21 PM   #21
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It dropped into place. I'm going to split the c4bp tomorrow and see if owt is different. If I can't find owt il put the c4 back in and take the c6 to a proper gearbox place
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Old 03-09-2018, 11:10 AM   #22
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So after a long video chat on messenger it looks like we have found what is wrong with Ben's gearbox.

Ben posted images on Facebook of the gearbox internals. I spotted this from there so asked him to check it out first.



The inner piece of the 5th gear was fitted upside down.

This is the piece, the boss in the centre is proud and is fitted upwards.



It's seems a very common mistake as it looks as though it fits either way but the under side is flat. When fitting it make sure it fits inside the lugs of the baulk ring. It should slide easily.

Ben had managed to crush the inner piece, baulk ring and 5th gear together and couldn't even get them apart once removed.

Fortunately he has another box, so robbed that for the 5th gear and selector parts.

Hopefully this problem is sorted now.

One thing he said that I genuinely don't get is that he says the box he removed was very low geared. He said it ran at 4800rpm at 70mph, and maxxed out at full revs at 96mph! I cannot think how that's even possible given that we counted the teeth in the box he removed and it's a C4 and he's running 185x55x13 tyres.
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Old 03-09-2018, 12:16 PM   #23
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I checked something the other day after you mentioned this, there’s an MG Motorsport gearbox that came with ratios which match those revs etc.
That box was originally fitted with a Quaife but it doesn’t matter about that, you definitely got the tooth count correct?


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Old 03-09-2018, 12:18 PM   #24
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M4BSQ



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couldnt be bothered to stretch that far to pull it out.
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Haz obviously don't like custard , my Mrs spits it out to!
I love it
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Old 03-09-2018, 12:32 PM   #25
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If that's is correct then that's a rare box. No use in a Mini but someone doing a track car ZR/ZS would love it.

Ben, we only counted to final drive teeth. Maybe if you get some time to spare that you could count the teeth on both of the 5th gear cogs???



That chart shows the teeth counts for the ratio numbers.
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Old 03-09-2018, 12:41 PM   #26
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That would be very rare and worth a lot of money to someone with a race MG or Lotus.


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I love it
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