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| How to "Lock" the G/Box?? https://www.ausmini.com/forums/viewtopic.php?f=2&t=88957 |
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| Author: | MiniBob [ Tue Mar 24, 2015 12:33 pm ] |
| Post subject: | How to "Lock" the G/Box?? |
I'm a bit unfamiliar with the gearbox  Can anyone give me a better idea of where these live please? rotate the selector rod anti clockwise so that it disengages from the bell crank levers I'm okay about which synchro's / hubs to turn to do the actual locking. |
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| Author: | drmini in aust [ Tue Mar 24, 2015 12:58 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
You need to take the diff housing off first, to see what you are doing. Then remove the detent ball and spring from the RH side , and pull the blocking sleeve out. THEN, you can make sure it's in neutral, and rotate the selector rod (sticking out the back) anti-clockwise so the lever end of it clears the 3 bell crank lever slots. |
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| Author: | MiniBob [ Tue Mar 24, 2015 1:14 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
Ah that makes a bit more sense now, thanks very much Doc  Explains why I couldn't see things too   I suppose the locking is sufficient to undo the Ist motion shaft nut? The drop gear end that is? |
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| Author: | drmini in aust [ Tue Mar 24, 2015 1:50 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
Yes. Lock it in 1st gear and 4th gear for all 4 synchro boxes including rodchange ones. [3 synchro ones use 2nd & 4th gear, because 1st is weak]. [edit] NEVER use 2nd and 3rd. A mate did this with his A/H Sprite gearbox and it broke teeth off. Tooth load is least when ratios are far apart (like 1st + 4th). |
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| Author: | MiniBob [ Tue Mar 24, 2015 2:20 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
Awesome, thats great. I can get started Thanks |
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| Author: | VulcanBB18 [ Tue Mar 24, 2015 5:40 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
drmini in aust wrote: [edit] NEVER use 2nd and 3rd. A mate did this with his A/H Sprite gearbox and it broke teeth off. Tooth load is least when ratios are far apart (like 1st + 4th). Sad to say I made this mistake once, wrecked a nice looking laygear & 3rd  cheers, Jacob |
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| Author: | MiniBob [ Tue Mar 31, 2015 11:59 am ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
drmini in aust wrote: Yes. Lock it in 1st gear and 4th gear for all 4 synchro boxes including rodchange ones. [3 synchro ones use 2nd & 4th gear, because 1st is weak]. [edit] NEVER use 2nd and 3rd. A mate did this with his A/H Sprite gearbox and it broke teeth off. Tooth load is least when ratios are far apart (like 1st + 4th). Well that was a little easier than I anticipated. Once the rod change is out of the way the gears just push apart. Now have the 1st motion gear removed, two of us required to undo the locknut tho' with me standing on the upturned 'box. Also dismantled the crown wheel and ready to go back in.  Does anyone know what the torque is for ARB bolts into a Quaife LSD?? Have asked Quaife but they are on Pommie clock. |
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| Author: | simon k [ Tue Mar 31, 2015 8:57 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
VulcanBB18 wrote: drmini in aust wrote: [edit] NEVER use 2nd and 3rd. A mate did this with his A/H Sprite gearbox and it broke teeth off. Tooth load is least when ratios are far apart (like 1st + 4th). Sad to say I made this mistake once, wrecked a nice looking laygear & 3rd cheers, Jacob ditto... broke dad's MK2 box so had to give him mine
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| Author: | 73GT [ Wed Apr 01, 2015 6:36 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
drmini in aust wrote: Yes. Lock it in 1st gear and 4th gear for all 4 synchro boxes including rodchange ones. [3 synchro ones use 2nd & 4th gear, because 1st is weak]. [edit] NEVER use 2nd and 3rd. A mate did this with his A/H Sprite gearbox and it broke teeth off. Tooth load is least when ratios are far apart (like 1st + 4th). Hi Doc I did a 3 sychro box & used 2nd & 4th gear to lock & broke tooth on 2nd gear. I found out after researching that reverse & 4th are better & that is what i used to sucessfully get the main nut undone. 
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| Author: | drmini in aust [ Wed Apr 01, 2015 7:07 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
I was pretty sure it's Leyland Aust's Black Book manual that recommends use 2nd & 4th on 3 synchro boxes. [edit] oops my bad, on page f-6 it says use 1st & 4th IF the box has B form gears. For early boxes with A form gears it says use a `suitable jig' to hold the drive flanges, don't lock gears.  No idea what sort of jig.I haven't done a 3 synchro for many years (that one was a Sprite box I think) and back then I used 1st and 4th. I'm sure the `lock 2nd & 4th for 3 synchro boxes' was stated in a manual, I just need to find which one. |
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| Author: | ken@miniauto [ Wed Apr 01, 2015 7:56 pm ] |
| Post subject: | Re: How to "Lock" the G/Box?? |
Used 2nd & 4th on a 3spd today (B form gears) no problems Needed a long breaker bar with 300mm extension for the pinion nut |
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