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Gearbox strip down

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Gearbox strip down

Post  Andrewwoey on Thu Sep 22, 2016 4:58 pm

Over winter i will open up my gearbox to try and cure the leak from the kick/gear shaft (4 speed on 8e).

Is there anything i need to watch out for when dismantling it? Any springs or other items that's going to shoot out?

Andy.

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Re: Gearbox strip down

Post  Jack Clegg on Fri Sep 23, 2016 9:13 am

No spring surprises. Make sure the mainshaft stays put when removing inner case. You may be able to leave the clutch intact on the other end.
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Re: Gearbox strip down

Post  Andrewwoey on Fri Sep 23, 2016 8:32 pm

Jack Clegg wrote:No spring surprises. Make sure the mainshaft stays put when removing inner case. You may be able to leave the clutch intact on the other end.

That's great. Thanks for the information. Hopefully no drama's when i do the job.

Andy.

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Re: Gearbox strip down

Post  banjo boy on Fri Sep 23, 2016 9:20 pm

Hi Andy
I have built a few gearboxes over the years,my first one which was a Burman 52 I was a bit worried about stripping it down but once I started to strip it down I realised how fairly simple they are and enjoyed re building it. Just take your time and take a picture for ref at every stage before you take apart this helped me just in case ,and last of all a exploded view of the gear box so to check things are in correct order.

Regards
Laurence
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Re: Gearbox strip down

Post  Andrewwoey on Fri Sep 23, 2016 9:52 pm

banjo boy wrote:Hi Andy
I have built a few gearboxes over the years,my first one which was a Burman 52 I was a bit worried about stripping it down but once I started to strip it down I realised how fairly simple they are and enjoyed re building it. Just take your time and take a picture for ref at every stage before you take apart this helped me just in case ,and last of all a exploded view of the gear box so to check things are in correct order.

Regards
Laurence

Thanks for the great advice. I am used to Japanese engines but still do the same with the photo's. I look forwards to this winters gearbox repair. Its dripping lots, so it as to be done.

Andy.

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Re: Gearbox strip down

Post  banjo boy on Sat Sep 24, 2016 9:53 am

Andy glad to be of help,If it has a oil leak which most do,make sure the surfaces are flat, I used a nice flat surface and some wet and dry.
If you have built Japanese then you will have no trouble with these gearboxes.

Laurence
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Re: Gearbox strip down

Post  Andrewwoey on Sat Sep 24, 2016 10:47 am

banjo boy wrote:Andy glad to be of help,If it has a oil leak which most do,make sure the surfaces are flat, I used a nice flat surface and some wet and dry.
If you have built Japanese then you will have no trouble with these gearboxes.

Laurence

The leak is from the gear/kick start shaft. I understand there is a O ring in there.

Andy.

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Re: Gearbox strip down

Post  banjo boy on Sat Sep 24, 2016 12:12 pm

Andy I can't comment on that as my bike has a AMC gearbox, but I would say if the set up is similar then it will have a O ring on the outer casing if it is then you may not have to do a full strip down,not unless you want to check it out and replace bearings etc.Just make sure that the o ring is same size as metric ones are a little smaller,eg 1/4 =6.35 so this can make a difference between sealing and not sealing. But I am sure there is someone here on the forum who knows more on your gear box and what to look out for.

Laurence
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Re: Gearbox strip down

Post  Andrewwoey on Sat Sep 24, 2016 12:27 pm

Yes learning a lot about imperial and metric sizes. Built many Japanes engines and bikes over the years and now enjoying and learning about old British bikes and engines.
Thanks for the advice.

Andy.

Edit. Just done an inspection and its leaking in many places/joints. I will pul the motor out over winter and give it a once over.

Andy.

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Grease nipple

Post  Andrewwoey on Sun Sep 25, 2016 3:56 pm

Should there be a grease nipple in the end of the kick start shaft? In the parts diagram its number 56 (4 speed).

Andy.


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Re: Gearbox strip down

Post  banjo boy on Sun Sep 25, 2016 5:05 pm

No Andy what you have there is a centre drilled hole to enable the shaft to have been ground when it was made.

regards

Laurence
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Re: Gearbox strip down

Post  Andrewwoey on Sun Sep 25, 2016 7:20 pm

banjo boy wrote:No Andy what you have there is a centre drilled hole to enable the shaft to have been ground when it was made.

regards

Laurence

Thank you again Laurence.

Andy.

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