18 replies to this topic

[ozz1]

Hi all,

I have my gear box back in the car to make sure everythings in order before I mate it to the block and I can't get it into reverse although it will go into the reverse 'gate'. I've never driven the car with this gearbox so can't comment on if its ever worked. The gearbox is from a race prepared engine (has close ratio gears, lsd etc), so I'm unsure if the reverse gear has been removed to avoid accidental selection during competition? There is a notched bronze plate stopping it move- is this standard? I'm not going to pretend I know what im talking about here...gearboxes really are my achillies heel! If anyone knows of any gearbox literature that isnt too hard to get your head around that would be great too.

 

I've attached a video of the selector whilst im shifting in the link below. Any thoughts?

 

 

Oscar

 

video

https://youtu.be/9X9EsihInl0

Attached Files

•  14555651_1498073873542796_1392975824_n.jpg   56.49K   30 downloads

Edited by ozz1, 22 October 2016 - 08:19 PM.

[Spider]

Reverse Gear is engaged on the gear teeth themselves, unlike all other gears in the Gearbox (except on a 3 synchro) which engage on dogs. As the gear teeth are very course compared to the teeth on the dogs, they do need to be lined up much closer to where they need be to engage.

 

So, if you spin the gears over, preferable while someone is trying to select reverse, it'll likely go in.

 

The other thing is being 'race prepared' it may have a reverse gate lockout. This is to prevent accidental selection of reverse while in the heat of it on the track, though most of these were fitted to he shifter rather than the gearbox. If fitted correctly, they actually lock out that section of the neutral gate completely so when shifting from 2nd to 3rd, there's no need to find 3rd gear gate on that shift, just slam it all the way over to the lock and push up.

[ozz1]

Cheers, will give it a go later and let you know if does the trick! Does everything in the video look like its working as it should?

Reverse Gear is engaged on the gear teeth themselves, unlike all other gears in the Gearbox (except on a 3 synchro) which engage on dogs. As the gear teeth are very course compared to the teeth on the dogs, they do need to be lined up much closer to where they need be to engage.

 

So, if you spin the gears over, preferable while someone is trying to select reverse, it'll likely go in.

 

The other thing is being 'race prepared' it may have a reverse gate lockout. This is to prevent accidental selection of reverse while in the heat of it on the track, though most of these were fitted to he shifter rather than the gearbox. If fitted correctly, they actually lock out that section of the neutral gate completely so when shifting from 2nd to 3rd, there's no need to find 3rd gear gate on that shift, just slam it all the way over to the lock and push up.

[Spider]

Sorry, I didn't have time this morning to view the video.

 

It appears the reverse lockout is fitted inside the gearbox. Does it actually have a reverse gear fitted?

[ozz1]

Sorry, I didn't have time this morning to view the video.

 

It appears the reverse lockout is fitted inside the gearbox. Does it actually have a reverse gear fitted?

No worries, thanks for looking. I don't know, I've googled what the reverse gear looks like and can't find it, then again I'm unsure where I should be looking in the first place...

[Ethel]

Reverse is on a short shaft. It has 2 cogs, one driven by the first on the layshaft. That's nearest the centre web of the casing.

[Spider]

Reverse Gear is a separate gear that's more or less under the little end of the laygear - as Ethal has already beaten me to that!

[mini13]

yep the remote bix is pretty self explanary inside,

 

the bit you video'd moves three shafts, one for 1st & 2nd, one for 3rd and 4th, and one for reverse, the reverse shaft slides a gear located inder the lay shaft that meshes with the smallest gear oin the lay shaft and the toothed bit on 1st/2nd sycro hub.

 

it does look line that plates getting in the way, could it have been out in uoside down?

[ozz1]

Is this it?

[ozz1]

.

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[Spider]

It does look like it, hard to tell for sure from that photo, but it doesn't appear right, but I stress, it could be the photo.

 

FYI, it's a crash box you have (3 synchro).

 

I note earlier, you mentioned that it was a race prepared Gearbox with Close Ratio Gears. Can you have a good look on the Laygear for a part number?

[mini13]

Yep thats the gear,

 

it slides into a recess in the casing so one of the sets of teeth on it is hidden ( or at least it does on 4 sync boxes)

 

not wanting to be the bearer of bad news buit that box looks suspiciously like a standard 3 sync box. could be that it has S gears though.

Edited by mini13, 24 October 2016 - 10:01 AM.

[ozz1]

number on layshaft: 22G76 (upside down G so potentially a 9)

number on selector hub?: 22G439

number on casing: 22G68 & 95/11760 - 1960!!

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[Spider]

The casing was used in the Last of the A type 3 synchro gears and the first of the B type. From the P/N on the Hub, they do appear to be B type gears, however from the Laygear you have, they are not CR at all. They were either 22G232 or later ones were 22G1100.

 

Sorry, but I think you've been sold a pup.

[mini13]

as above,

 

that said, 3 sync boxes go for ok money for people restoring period cars, so outing it is an option and then get somthing else.

 

stick some pics up of the Diff, you mention an LSD, we can try to confirm this

Edited by mini13, 24 October 2016 - 10:21 AM.