3 Rod Gearbox problem

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cannonball
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3 Rod Gearbox problem

Post by cannonball » Mon Nov 05, 2018 5:23 pm

Had a couple of hours spare this afternoon and it was back on with the overalls and underneath to connect the three rods of the gearbox back onto the box only to find that the middle one ( no 12 in the components of side cover ) has moved inwards about 5mm making it almost impossible to get it back out far enough to connect the rod back up.
When I took the rods off I replaced the large washers and nuts to stop things falling into the box, it can be prised out a little with a screwdriver but not far enough to attach the rod properly and as soon as I take the pressure off it slides back inwards. Maybe I am not putting enough pressure on it to lever it back out.


Any ideas would be much appreciated.
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scimjim
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3 Rod Gearbox problem

Post by scimjim » Mon Nov 05, 2018 5:43 pm

Oops - never disconnect the levers from the box unless replacing the seals (then be careful not to let the shaft move inboard) - there’s simple clips on the rod/lever joint for removal. I’m not 100% sure what happens when this dire warning isn’t heeded but I suspect the shaft locking plunger drops out?


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cannonball
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3 Rod Gearbox problem

Post by cannonball » Mon Nov 05, 2018 7:51 pm

Wish I had seen the dire warning before I took it to bits. :(

Going to have another bash at it next weekend and do a bit of reading about the box, hopefully my luck will improve.



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peter freeman
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3 Rod Gearbox problem

Post by peter freeman » Mon Nov 05, 2018 7:57 pm

Got mine back in position but that was a lot of years ago - got a feeling I put a bush on the outside while I put a nut on the end to hold it in place - very fiddly - alternatively you can loosen the plate off to get to the inside bits and hold them against the plate while you put something on the outside to hold the bits in position. It was a long time ago ( about 86 ) so my memory is not up to remembering exactly what I did.



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scimjim
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3 Rod Gearbox problem

Post by scimjim » Mon Nov 05, 2018 8:12 pm

Mark did say take the rods off here (rather than the arms), so I apologise for not adding the warning like I did here :oops:


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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3 Rod Gearbox problem

Post by roymck » Mon Nov 05, 2018 8:42 pm

The lever you have highlighted has inside the box a interlock mechanism . If the lever goes in too far the interlock mechanism falls apart and drops into the depths of the box. This interlock stops 2 gears being selected at once . If you have an doubts then maybe best to remove the side plate complete do what you need to do and then refit the side plate .



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Nigel Clark
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3 Rod Gearbox problem

Post by Nigel Clark » Mon Nov 05, 2018 8:57 pm

Not what you want to hear but... The advice above is spot on.

Take the side cover off the gearbox and check if both detent interlock balls and spring are still in place. If so, you dodged a bullet. Get the spindles and detent mechanism back in place while in the bench then put the side cover back in the gearbox.

If one or both ball bearings are missing from the detent mechanism, try draining the oil from the gearbox and hope they come out with the oil. If not... You can guess the next step.

Nigel



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3 Rod Gearbox problem

Post by cannonball » Mon Nov 05, 2018 10:59 pm

Thanks for the replies guys. This is going to be a journey into the unknown for me and I am dreading it.

Are there any bits or springs under pressure that can go flying around when I take the side plate off.



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3 Rod Gearbox problem

Post by cannonball » Mon Nov 05, 2018 11:29 pm

Just found this on the web and it shows the other side of the plate and all it's components, there is mention that more than 3/4 inch inward movement of the shaft is the danger zone and hopefully it has not gone that far.

http://www.scimitarweb.co.uk/~donkenned ... lSeals.htm



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Roger Pennington
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3 Rod Gearbox problem

Post by Roger Pennington » Tue Nov 06, 2018 12:38 am

cannonball wrote:
Mon Nov 05, 2018 11:29 pm
Just found this on the web.......
Well, actually you found it here on Scimitarweb! :D (Though TBF, you may have gone on a circular tour round the web to get to it).
It is referenced in the How to guides/FAQ section here. There's a vast amount of useful info in there which Don wrote up during his ownership and restoration of his car, and when he sold the car, he allowed us to host the info on Scimitarweb to preserve it for posterity. It's a great archive, but over the years, with revisions and upgrades to the site it seems to have got a bit lost, so we perhaps need to consider if there's a way to make it more obvious, as the turnover of owners over the years means people aren't always aware of it - In fact I've just added it to Jim's FAQ note, which should help :)


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cannonball
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3 Rod Gearbox problem

Post by cannonball » Tue Nov 06, 2018 9:17 am

Can't remember exactly what I had typed in but I stumbled on a photo on images and the rest is history as they say.



Kevin
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3 Rod Gearbox problem

Post by Kevin » Wed Nov 07, 2018 1:09 pm

On the side cover diagram, can anyone explain where the ball bearing number 20 locates?
Also does the pin number 16 pass through the spring in between the x2 ball bearings?
Thank you for your help.
Kevin.



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3 Rod Gearbox problem

Post by weaver » Thu Nov 15, 2018 7:41 pm

Hi Kevin, yes the pin sits in the centre of the spring. Ask for ball "20" or even spring 19, I haven't found either when I removed the side cover.



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3 Rod Gearbox problem

Post by philynnbob » Thu Nov 15, 2018 9:49 pm

Does spring 19 & ball 20 not fit 90 degrees to side plate in recess/drilled hole on gearbox ? Distant memory it may do so,but not really 100% sure.
Phil



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