One of my jampots is leaking...
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One of my jampots is leaking...
Hello everyone
I've noticed a small amount of oil has leaked from one of the jampots on my 1953 18s and I was wondering if anyone has any tips or gems of wisdom before I start investigating the cause.
I've had the bike for 3 years and have done about a thousand miles in that time. The handling seems fine and I've not noticed any change - and certainly not the 'very lively action' that the owners manual says is evidence of shortage of oil. So I presume this is either a recent small leak or a very small leak that has been accumulating for some time without me noticing.
I'm hoping the leak is due to the bottom pivot lug not being sufficiently tight. My planned first step is to remove the unit from the bike, remove the pivot lug, check/top up with SAE 20 oil (to 'a trifle under 3 fl ozs' as the owners manual advises so delightfully) then tighten up and fit back on the bike to see if that has done the trick.
If anyone has any advice/tips I'd be very grateful to hear.
Many thanks
John
I've noticed a small amount of oil has leaked from one of the jampots on my 1953 18s and I was wondering if anyone has any tips or gems of wisdom before I start investigating the cause.
I've had the bike for 3 years and have done about a thousand miles in that time. The handling seems fine and I've not noticed any change - and certainly not the 'very lively action' that the owners manual says is evidence of shortage of oil. So I presume this is either a recent small leak or a very small leak that has been accumulating for some time without me noticing.
I'm hoping the leak is due to the bottom pivot lug not being sufficiently tight. My planned first step is to remove the unit from the bike, remove the pivot lug, check/top up with SAE 20 oil (to 'a trifle under 3 fl ozs' as the owners manual advises so delightfully) then tighten up and fit back on the bike to see if that has done the trick.
If anyone has any advice/tips I'd be very grateful to hear.
Many thanks
John
- dave16mct
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Re: One of my jampots is leaking...
You could also put a new fibre washer in while you've got the collar off.
Dave.
Dave.
- ajscomboman
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Re: One of my jampots is leaking...
And use some PTFE thread tape when reassembling as the new fibre washers are harder than originals and don't compress as much which can allow a bit of seepage.dave16mct wrote:You could also put a new fibre washer in while you've got the collar off.
Dave.
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Re: One of my jampots is leaking...
Dave and ajscomboman - thanks very much for your quick and helpful replies. I'll certainly replace the fibre washer and use some PTFE tape.
Cheers
John
Cheers
John
- Janet
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Re: One of my jampots is leaking...
If you end up having to dismantle and rebuild the offending unit, there's a funny article here called Jampot Overhaul by W Jordan http://www.jampot.com/article_read.asp?id=337 telling all the stages you'll go through.
BTW, it is very informative.
BTW, it is very informative.
- ajscomboman
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Re: One of my jampots is leaking...
I'd forgotten about that one, although tongue in cheek some of it does ring true!Janet wrote:If you end up having to dismantle and rebuild the offending unit, there's a funny article here called Jampot Overhaul by W Jordan http://www.jampot.com/article_read.asp?id=337 telling all the stages you'll go through.
BTW, it is very informative.
I made a holding tool from maple when I overhauled all my sets and it made the job a doddle.
- Pharisee
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Re: One of my jampots is leaking...
By sheer co-incidence, I reconditioned my 'Jampots' today. I took them apart, replaced the top oil seal and swapped out the plastic bushes for machined bronze items. The 'O' ring in the top mounting and the two fibre washers in the bottom mount were also replaced as were the leather washers. I also smeared a little Hylomar gasket sealer on the bottom thread before I screwed the clevis on. I poured in 85ml of SAE20 fork oil before screwing it on.
Getting them apart and putting them together again can be problematic so I cobbled together a 'fixture' to compress the springs.
Getting them apart and putting them together again can be problematic so I cobbled together a 'fixture' to compress the springs.
I'm from the Fens.... Gimme six.
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Re: One of my jampots is leaking...
Janet - thanks v much for that funny article. Hee hee and it makes the point - proceed with care!
Pharisee - yes, what a happy coincidence and thanks very much for your advice and sharing the pics of your handiwork.
Cheers all
John
Pharisee - yes, what a happy coincidence and thanks very much for your advice and sharing the pics of your handiwork.
Cheers all
John
- Group Leader
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Re: One of my jampots is leaking...
They are very interesting photographs Pharisee. I too will be venturing "into the Jampots" come the winter maintenance programme!
Alan
Alan
1953 AJS 16MS, 1939 BSA 250 and a 1/3 scale Sopwith Triplane but that's another story .....
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Re: One of my jampots is leaking...
Two excellent illustrated strip and rebuild guides here from Christians Archive:
http://archives.jampot.dk/technical/Sus ... around.pdf
http://archives.jampot.dk/technical/Sus ... ampots.pdf
http://archives.jampot.dk/technical/Sus ... around.pdf
http://archives.jampot.dk/technical/Sus ... ampots.pdf
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'