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ES2 gearbox

Submitted by george_phillips on Tue, 30/01/2018
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Hi guys - when I get rid of this wretched chesty cough I intend to attack the gearbox. I have a couple of questions. What can I do with the g/box out that I can't do with it in situ? Is it absolutely necessary to remove it for a complete dismantle? Sorry if it's a daft question but I'll be interested in the accumulative experience. George

Submitted by robert_tuck on Tue, 30/01/2018

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Replacment of bearings in the main case easier with the box out ,removal of the top fixing Through bolt if seized in the alloy casting and not allowing proper primary chain adjustment.

Submitted by robert_tuck on Tue, 30/01/2018

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Hi George, The top gearbox fixing is the the big diameter coach type bolt that you have to slacken to adjust the primary. This can seize in the alloy passage and not allow the box to be fully secured or slid back and forth on the steel engine/box plates. You can move the adjusters and appear to be adjusting the chain but it can be an illusion caused by the twisting of the box in its mountings.The chain adjustment is inefective and unreliable. The cure is to remove the primary and heat the box and knock out the bolt for cleaning and greasing. Can probably be done with the box in situ . Mine could not.Had to take all out.Corroded in solid .

Submitted by ian_soady on Wed, 31/01/2018

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If I was going to remove / replace the bearings I'd definitely remove it as otherwise there's too much risk of getting them in skewed, as well as the difficulty in getting heat to the case.

Submitted by george_phillips on Wed, 31/01/2018

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That's right, Ian. Problem is that I won't know if the bearing is thrashed until I remove all the gears by which time I've then got to figure how to get the primary side off with all the gears missing. It seems that I'm stuck with removing the primary side first (while I can lock the clutch etc) then deal with the gear box. If the bearings prove to be OK it was just a lot of work for nothing.

Submitted by ian_soady on Wed, 31/01/2018

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I suppose it depends why you're getting into it. If the bearings seem OK then you'd probably be safe but you can only really check them when they're out as the mainshaft in the sleeve gear will tend to disguise any play / roughness in the sleeve gear bearing.

Submitted by george_phillips on Wed, 31/01/2018

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Thanks for that, Ian. I'm coming to terms with the fact that it's all going to come off. Sleeves up...............

 


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