GB gearbox full of neutrals!

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Mike Nash
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GB gearbox full of neutrals!

Postby Mike Nash » Sat Dec 01, 2018 9:20 pm

Dear all,

Just about to install my 1956 GB g'box and a last check shows it doesn't engage any gears. It did so when last checked about a year ago and previous to that worked OK. My thinking is that drained of oil its gummed up so I should fill it full of kerosene (i.e. UK central heating oil) and hope it'll free off. If successful, a few changes of kerosene and the oil might see it right. I'm wary of opening it up; I've a bad history with g'boxes!

But before I go down this path I'd be very grateful for your comments. Thanks in advance, MikeN.
Last edited by Mike Nash on Mon Dec 03, 2018 12:20 pm, edited 2 times in total.

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Re: BG gearbox full on neutrals!

Postby paul.jameson » Sat Dec 01, 2018 9:56 pm

I wouldn't bother with the kerosene but simply fill with the appropriate oil, wriggle it about a bit and then I would be surprised if it didn't work as well as it did before. After all, if it has simply been sitting in the workshop, what could have damaged it?
Paul Jameson
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Mike Nash
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Re: BG gearbox full on neutrals!

Postby Mike Nash » Sat Dec 01, 2018 10:05 pm

Thanks Paul.
Through the 70s & 80s I used it every day (about 90 miles each day) on 20/50 engine oil and all was well, indeed it was OK till about a year ago when I drained it but other things intruded before I could fit it. And externally it has no signs of internal wear.
Unless anyone else has a better idea I'll do as you say, MikeN.
PS How do you edit titles? That "on" should "of"!

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Re: BG gearbox full on neutrals!

Postby john.whiting » Sun Dec 02, 2018 3:01 am

Holding the box in one hand and the lever with the other,probably not enough force applied for a proper change.

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Re: BG gearbox full on neutrals!

Postby simon.holyfield » Sun Dec 02, 2018 10:51 am

Mike Nash wrote:PS How do you edit titles? That "on" should "of"!


Just go back to your first post Mike. Change that and it will change the title of the thread as well.
cheers

Simes

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http://ariel-square-four.blogspot.com

Mike Nash
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Re: BG gearbox full of neutrals!

Postby Mike Nash » Sun Dec 02, 2018 11:44 am

Oh yeah! Well, the top one's corrected but not the subsequent headings - but I'm not greedy.
Re John W's point I think I'll mount the 'box on a wooden stand that I can lock in my bench vice to give me a steady hold on it. I'll try to engage then and also fill with oil and see what happens. Incidentally, this box is still in its 1956 condition (my dad bought the bike for me in 1959!) and apart from this engagement issue it's given no problems. But it has had a magnet in the drain plug for the last 40 years!
Thanks for your advice, MikeN.

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Re: GB gearbox full of neutrals!

Postby Mike Nash » Tue Dec 04, 2018 6:00 pm

Right! Thanks for your advice so far.

My 'box is now bolted to a wooden frame that is securely fixed in my bench vice and it's still stuck in a neutral that's between 3rd and 4th.

According to Len Ore (in Cheval July 2011's "Ariel Technical Tips") "When removing the GB gearbox end cover, there is no need to take off the kickstart or gear levers. Disconnect the clutch cable [done that!] and pull the whole lot off in one go". So I've drained the 'box of oil and removed the cheese headed bolts around the end cover and am tugging at the kickstart and gear levers to persuade the cover to come off - but it seems stuck at only a couple of millimetres of movement!

Now I'm not one to doubt Len but do you agree that I must just tug a little harder, perhaps carefully using a broad screwdriver blade to separate them? Regards from MikeN.

PS How do I get my name in red on these posts? (I've been a club member for some 20+ years!)

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Re: GB gearbox full of neutrals!

Postby Steven.Carter » Tue Dec 04, 2018 6:20 pm

Heve you taken off the gear indicator thingy?

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Re: GB gearbox full of neutrals!

Postby Mike Nash » Tue Dec 04, 2018 6:50 pm

No Steve, I haven't. So I should, should I? I'll give it a go and see what happens. MikeN.

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Re: GB gearbox full of neutrals!

Postby Steven.Carter » Tue Dec 04, 2018 7:09 pm

Yep that bit has to come off.


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