Layshaft Advice

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Been watching numerous blind bearing removal videos on YouTube....using hydraulic pressure from wet pieces of paper/shop towel/bread/candle wax/gear grease/peanut butter/silicone sealant etc etc....seems to always work where other methods fail (heat/picks etc).



Any good reason not to give it a go on my layshaft bearing R&R?


well shit...
 
Been watching numerous blind bearing removal videos on YouTube....using hydraulic pressure from wet pieces of paper/shop towel/bread/candle wax/gear grease/peanut butter/silicone sealant etc etc....seems to always work where other methods fail (heat/picks etc).



Any good reason not to give it a go on my layshaft bearing R&R?


I wonder if it works better with white, whole wheat, or rye bread?
 
AN offers, as their dealers do, a g/b rebuild kit that includes bearings, seals, bushes and gaskets. IIRC the kit is lacking one or two gear bushings, which are available, but which may (usually do) require reaming.

Based on what I have read in this post, I'd advise you to farm out the work. There are a few points during assembly where the shift forks will fit in the gears they control, but if not fit correctly (the gears) the box will lock up. If you choose to proceed take many pictures.
 
Thanks Ron,
I agree, and Im usually the kind of person to be thorough about a thing like this but I haven't got alot of the specialty tools. That and I just replaced all my isolastics and remounted the engine so I'd be undoing some work.

Is there anything I should be looking for that might point to a definite need for a rebuild?

Might have to just bite the bullet.

The Norton gearbox was designed for a 20 hp 500cc engine, but used for everything up to 750/850cc 50 hp. They do a remarkable job for what they are. If I need to open up a gearbox for any reason that has many miles since the last rebuild, I want to give it the best chance to survive, so I want to pull it completely down to clean, inspect and replace as necessary!
 
like i have posted before on a sealed bearing it can work BUT not so well on an open bearing. this video it is a sealed bearing and the original layshaft bearing is an open bearing.

Been watching numerous blind bearing removal videos on YouTube....using hydraulic pressure from wet pieces of paper/shop towel/bread/candle wax/gear grease/peanut butter/silicone sealant etc etc....seems to always work where other methods fail (heat/picks etc).



Any good reason not to give it a go on my layshaft bearing R&R?
 
like i have posted before on a sealed bearing it can work BUT not so well on an open bearing. this video it is a sealed bearing and the original layshaft bearing is an open bearing.

Here's a non-sealed bearing in a motorcycle being removed with bread....but have heard the paper towel strips wetted with water or with grease are even more effective.

 
if you are close to me i would be more happy to help you with this.
Thanks Bill but the bike is in NJ and your profile locates you a few hundred miles south, unless that info has changed. Ill get a bearing puller or try the greasy towel trick.
 
Bread, who would have thought. What is the ID of the layshaft bearing? Thinking what size of shaft to fit in there.
 
Listen to bill. He knows stuff. A lifetime career mechanic, & Norton master.
That counts for way more than the armchair engineers guesses.
 
Ill plan to extract and replace the bearing on the bike. If things looks a mess while I'm inside I'll pull the box and take it from there.
 
Following up here for the sake of completion. Hot case and a blind bearing puller worked. I'd image you could pull it out with an improvised puller if the proper tool is unavailable. Not overly complicated. Hot box, cold parts.
Rebuilt the gearbox in situ, replaced all accessible bearings, seals and bushes. Box is now back together and shifting all gears.

Hope this thread may help someone in the future.
 
Following up here for the sake of completion. Hot case and a blind bearing puller worked. I'd image you could pull it out with an improvised puller if the proper tool is unavailable. Not overly complicated. Hot box, cold parts.
Rebuilt the gearbox in situ, replaced all accessible bearings, seals and bushes. Box is now back together and shifting all gears.

Hope this thread may help someone in the future.
Good to hear...you're ahead of me...i just reached the fully dismantled point last night. Got main and lay bearings out after lots of propane heating from drive side outer end (pulled primary off for this access). Both came out with only a little effort...no puller needed for lay bearing as the shaft was quite snug on the inner race...so it pulled outer with it.
 
Been watching numerous blind bearing removal videos on YouTube....using hydraulic pressure from wet pieces of paper/shop towel/bread/candle wax/gear grease/peanut butter/silicone sealant etc etc....seems to always work where other methods fail (heat/picks etc).



Any good reason not to give it a go on my layshaft bearing R&R?


I have removed several blind bearings and bushings using grease in this manner, it does work good.
 
I have removed several blind bearings and bushings using grease in this manner, it does work good.
I was ready to try it on the layshaft bearing if heating didn't get 'er done. Good to have in the back pocket for future efforts.
 
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