I believe some parts for 3 synchro boxes are now unobtainium.
4 synchro boxes are stronger too. Particularly 1st & 2nd.
All I use 3 synchro boxes for now is engine stands...
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| Gearbox rebuild https://www.ausmini.com/forums/viewtopic.php?f=2&t=58455 |
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| Author: | roleyfoley [ Tue Nov 03, 2009 8:55 am ] |
| Post subject: | Gearbox rebuild |
hey all getting the engine rebuilt and have gotten up to the gearbox/diff , does anyone have a list or something of parts that are usually replaced when a gearbox is rebuilt. Its for a road 998 nothing to crazy just a 202 head, new cam and its a 3 sychro box |
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| Author: | jimmyinamini [ Tue Nov 03, 2009 9:23 am ] |
| Post subject: | |
the list would contain whatever is broken or about to , |
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| Author: | Wombat [ Tue Nov 03, 2009 10:21 am ] |
| Post subject: | |
Minispares put together a kit with all the bearings and gaskets needed - you can get it with or with the diff bearings - if doing the diff ask for the stronger rated diff pin. The kit won't have the layshaft thrust washers which most probably will need replacing after measuring the clearance or the main bearing shims |
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| Author: | roleyfoley [ Tue Nov 03, 2009 10:31 am ] |
| Post subject: | |
Great thanks Wombat, ill flick them an email. |
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| Author: | Mick [ Tue Nov 03, 2009 10:38 am ] |
| Post subject: | |
A couple of things aren't included which can be a little annoying. The idle gear needle roller (although this can be a couple of different sizes so check carefully before ordering) and the bushes for the remote shift rod where it passes through the remote housing (if you have a remote gearchange).. There might be one or two other things as well...I can't remember however. You have to be able to tell them you drive uni type as it changes the seals, and if it is remote, rod change and/or A+ or not(I think the A+ changes something right?) |
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| Author: | GT mowog [ Tue Nov 03, 2009 4:56 pm ] |
| Post subject: | |
Hi roleyfoley, Here's a list of the minimum parts I like to put in to a Mini Gearbox for recon;- Description P/N Qty Baulk Ring 22G2033 1 to 3 depending on condition 1st Motion Shaft Bearing 21MJ1 1 'Outrigger' Bearing 1LRJ15.8 1 'Support' Bearing CHM172 1 3rd Motion Shaft Bearing 1MDJT25.4N 1 Diff Bearings RLS11 2 Layshaft Bearings HYL8473 2 Idler Gear Bearings 88G302/2 2 Selector Fork 1st & 2nd 22A611 1 Diff Pin (I haven't seen any good ones of late) Diff Sun Gears DAM6624 2 Thrusts for above 2A7062/2 2 Output Shaft Thrusts BTA101 1 Layshaft 22A1371 1 Gasket & Seal Set HYL3614R 1 Speedo Pinion Seal AAU2304/1 1 EDIT> Synchro Hub Springs 22G2262 6 (as per Doc's added suggestion) Baulk Rings - these are not dear to buy, but there are a few different 'types' about. Some else here might suggest a good one. Diff Pins - all the ones I have seen of late have a hard but thin surface and don't last too well - there maybe some good ones about that others can suggest. I run X-pin diffs, but also more HP too. It is possible / likely that more than the above may need replacing. This is only a starting point. As someone else suggest, there are 'kits' about but these only contain some of the bearings that you need however there can be some saving in these. For some stupid reason they don't include the speedo pinion seal so be sure to ask for that seperately. |
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| Author: | roleyfoley [ Tue Nov 03, 2009 8:47 pm ] |
| Post subject: | |
great thanks again all. Ill make sure thats all on the quote i get back |
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| Author: | drmini in aust [ Tue Nov 03, 2009 8:53 pm ] |
| Post subject: | |
Also check the 3 springs inside each synchro hub. If they have lost tension from old age and use, you synchros will not work properly (particularly on downshifts), even with new baulk rings fitted. These 6 springs are only about $5 ea, IMO it's worth replacing the lot on an old box. |
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| Author: | GT mowog [ Wed Nov 04, 2009 5:53 am ] |
| Post subject: | |
Yeah, the Doc is right, I forgot the springs - very important. I was thinking a little more about this and I'd suggest that you think about looking for an All Synchro Box - you can usually pick these up for about $100 - $200 second hand (make sure you get the 'transfer' housing with it). It will allow you to go to a 3.44 diff (I guess that you have a 3.76 at the moment) and in situations where you might use 2nd, you can easily use 1st. Overhaul costs for 3 synchro vs 4 would be similar, but I think it fair to say that parts are easier to come by for the 4 synchro. |
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| Author: | drmini in aust [ Wed Nov 04, 2009 6:38 pm ] |
| Post subject: | |
I believe some parts for 3 synchro boxes are now unobtainium. 4 synchro boxes are stronger too. Particularly 1st & 2nd. All I use 3 synchro boxes for now is engine stands...
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| Author: | roleyfoley [ Fri Nov 06, 2009 7:14 am ] |
| Post subject: | |
GT mowog wrote: Yeah, the Doc is right, I forgot the springs - very important.
I was thinking a little more about this and I'd suggest that you think about looking for an All Synchro Box - you can usually pick these up for about $100 - $200 second hand (make sure you get the 'transfer' housing with it). It will allow you to go to a 3.44 diff (I guess that you have a 3.76 at the moment) and in situations where you might use 2nd, you can easily use 1st. Overhaul costs for 3 synchro vs 4 would be similar, but I think it fair to say that parts are easier to come by for the 4 synchro. Does that mean you cant go to a 3.44 diff with a 3 synchro box? With the swap between 3 and 4 is it just a matter of a new 1st gear or am i simplifying waaaay to much |
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| Author: | drmini in aust [ Fri Nov 06, 2009 7:31 am ] |
| Post subject: | |
You can put any diff including a 3.44, in a 3 synchro box. The gearbox casing was modified for the 4 synchro, you cannot convert a 3 synchro to 4. 4 synchro remote was used on Mini K, Mk2S, and early Clubby. Then about 1973 they went to the rodchange (another casing) box, but the gears in it except reverse are interchangeable with the Mini K box. |
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| Author: | GT mowog [ Fri Nov 06, 2009 7:33 am ] |
| Post subject: | |
roleyfoley wrote: Does that mean you cant go to a 3.44 diff with a 3 synchro box?
With the swap between 3 and 4 is it just a matter of a new 1st gear or am i simplifying waaaay to much The 'simple' answer is yes, a 3.44 will go in, BUT I think you said you have a 998 and without easily being able to select 1st gear on the move it is not a modification that I would recommend. They did factory fit the 3.44 diff in to the late model clubbies that had the 998, BUT these were all Synchro. |
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| Author: | Wombat [ Fri Nov 06, 2009 7:40 am ] |
| Post subject: | |
Also add a centre oil pick-up - the new version needs a slight modification - remove gauze - cut about 2" out of the bottom half of the horizontal tube - replace gauze. This will increase the pick up area 
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