Cheers Gezo, May I ask where that stamping info came from? and do you have stamping references for other Boxes? Say 997 cooper ? casting 22G68.

Simon, Hydro units have numbers stamped on them (and dates) to Identify S units other than paint marks!

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Sir Alec! we are not worthy!

Also the S/GT ones have a thicker rubber `spring', the top of the rubber in these is much closer to the metal ring. This is one reason they are stiffer.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

12A1288 is the part no of the so called 'Commonised" 3 synchro gearbox housing. From what I can work out, once 1275 engines started to be used in cars other than the 1275 Cooper "S" , this box was used to avoid having separate gearbox housings for small and large bore motors. They just put different gear ratios in this standardised housing. My 68 build MK1.5 S uses this housing. Don't know when this appeared on Australian built cars.
22G333 is probably the code used before the standardised housing.

Gezo,
My gearbox also has a 12FA code stamped on it.
12FA is an engine number code used on UK built cars such as MG1100 GT which used a 1275 engine. (Presumably non S) I think these cars used the close ratio gear set as well.
My parts book circa 1965 lists the 1275 Cooper S engine code as 12FA which is obviously wrong. Not sure what to make of that.
Speculation: BMC used the same housing and internals etc but with different diffs.

RonR

Hi Graham,
The only information I have on 22G68 is 850/998cc Mini 997/998cc Cooper, 'A' and 'B' type remote or magic wand.
The stamping - 12FA----- is of a genuine Mk1 S gearbox I have.
Mk 1 S gearbox reference I have is,
Gearbox case numbers(cast in) are in most cases 22G333 for three synchromesh. Though this casing was shared with some of the 1100-1300 range. Several late Australian Mk 1 S' have the 22A1128 (cast in) casing. This is still a three synchro box, but is more essentially standardised unit. Therefore the factory no longer made one case for small bore engines and one for big. Various references state that this casing was not used for the S. However I have seen several of these original cars and would suspect there was more afoot than accident damage or exchange units.
Either way the 22A1288 was introduced just in time to be replaced by the 22 G1128(cast in) four synchromesh unit. The S three synch box is a durable unit and most of the peculiar S parts have been reproduced. Often due to nothing more than lack of driving skill, modern users demand the four synchromesh box, in either standard or S forms. As a result a result prices for such units have become exorbitant.
*Never heard of a 22A1128 (probably a G), so don't know if this is a typo.
Thanks

Thanks Gezo!

That's what this forum is all about for me, how the info. just flows... Excellent!!

Who mentioned 22A1128? only you I think !?

Easy to get confused!!

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Sir Alec! we are not worthy!

22A1128 shows in my listing (Mini Car Clinic book) as an 850/998 Mini `B' type gears, magic wand.
More confusion...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

my mate has a clubman that he took a motor out of, that had originally come from a Morris 1100, because it had the squishy remote mounting.... it had a 22G68



hmmm, well, what started this line of questioning was that I really wanted to know if the 1100S shared the same casing as a MK1 S, the 1100S casing I have in the garage is 22A1288, so the 'standardised' housing

lovely stuff - I agree with Graham, it's great how the detail comes out

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did I tell you that I won a trophy?

I was actually referring to the rear helper springs Graham... .but what are the numbers on the hydro units? I have some I'd like to identify and the paint is long gone.

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did I tell you that I won a trophy?

I have 2 1100S boxes, both are 22A1128.
cases OK but one box is junk, no 1st gear....

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

1128 or 1288 >>

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did I tell you that I won a trophy?

Oops I wuz wrong...
One is 22G68, the other 12A1288.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

My 1968 Mk1 "S" had 22g333 casing. Also have genuine Mk2 box with FXeY followed by serial number. Sa and Xe either on box or part of engine number denotes close ratio gear set as fitted to all Coopers incl 997.
Cheers wild_willy

So, just to confirm, are you saying the four synchromesh (22G1128) is the exorbitant variety...?

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Personally I'd say they are not exorbitant these days. I have paid from $0-$100 for 4 synchro remote boxes, one was an S with the right gears in it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

KC's Mini Expert says Cooper S A & B type gears 22G190 and Cooper S B type gears 22G333 both with remote. Straight Cooper is 22G68 A & B type remote or magic wand

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!