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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 12-07-2012, 02:44 AM   #1 (permalink)
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76 T140v Foot spindle oil drip

converted my 76 T140V to a BNR belt drive and have oil seeping out somewhere in the primary case. I've put the oil seal on the crankshaft and plugged the 3 little holes that were for oil leveling and also added RTV to the alternator mounting bolts...no oil is coming from this area although when I reassemble I think i'm going to put some RTV on the crankshaft splines for extra measure.

Had the bike sitting on the side stand over night and all day and came back to it tonight to see oil seeping out of the hole where the foot change spindle (57-7003) goes in to connect with the gearbox (left foot gear change bike).

when I last put gear oil in the gearbox, I only put 500cc as the manual suggests and nothing came out of the overflow tube in the gearbox oil plug. I'm fairly confident there isn't too much gear oil.

It's a slow but pretty steady drip coming out which seems odd to me given it should only be some residual oil if anything at all and after sitting all night and day on the side stand it should have stopped by now but continues to drip.

Any thoughts on this out there?

Tonight I added an o-ring on the spindle and am thinking the clutch basket pressure should be enough to keep the spindle against the primary case and let the o-ring keep the oil out. I'm testing it over night on the side stand to see if anything drips out.
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Old 12-07-2012, 05:30 AM   #2 (permalink)
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there must be a sh*t load of oil in the primary if it can leak out of the change shaft?

Especially if the case is supposed to be empty?
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Old 12-07-2012, 03:50 PM   #3 (permalink)
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Originally Posted by DAVE M View Post
there must be a sh*t load of oil in the primary if it can leak out of the change shaft?

Especially if the case is supposed to be empty?
My thoughts too Dave.Must be about a Litre of oil in the empty case
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Old 12-08-2012, 06:37 PM   #4 (permalink)
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there's no oil in the primary except for the amount that drips out of the foot change spindle hole.

I have a belt drive, it's now set up as a dry primary but with oil seeping out of the foot change spindle hole it's not 100% dry. I have both primary drain hole plugs removed so oil doesn't build up in the primary and was also told this helps keep any moisture build up out as well.

Again, the oil that's leaking is gearbox oil - makes sense I guess when I lean left & right that it probably splashes in but with all of the discussions on converting to a belt drive and dry primary no one has mentioned this issue of oil coming out of the foot change spindle.

My dry test with an o-ring on the foot change spindle was a success. I left the bike on its side stand overnight and extremely minimal amount of oil got by the o-ring. As soon as I removed the spindle, oil came flowing out again so the o-ring was doing its job.

I took the bike out today with the o-ring on the foot change spindle which sits at the opening of the hole but didn't have the primary cover on, gearbox oil substantially leaked out from the leaning left & right. Will take out tomorrow with the primary cover on hoping that will push enough pressure against the foot change spindle to allow the o-ring to work.
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Old 12-08-2012, 07:27 PM   #5 (permalink)
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Common problem when the gearbox sprocket leaks oil out and down behind the primary side.

How it would weep out of the crossover l/h gearchange bracket that runs thru the cover is a mystery. . .

There is an o-ring to be usedto help seal this problem,

Problem is - you have to go in deep to get to it.

The rather large o-ring is the same part # as is a Trident something or other?

Memory fades. . .
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Old 12-08-2012, 08:08 PM   #6 (permalink)
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Seems very strange. Even if a lot of gearbox oil was making its way along the crossover shaft into the chaincase, it would surely first of all run into the bottom of the case and come out of the drain hole (which you say has the plug removed). There seems no rational reason why it should progress horizontally (or even at a slight angle if leaning to the left) along the 'U' portion of the shaft and then the final straight piece to the outside world!

I suppose if there is greatly excessive clearance between the shaft and the bore in the chaincase cover, any internal pressure could cause any oil mist to escape (if it weren't for the fact that no pressure could build up if the drain plug has been omitted). So sorry, no idea, but please do let us know when you've sussed it!
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Old 12-09-2012, 01:50 AM   #7 (permalink)
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Quote:
Originally Posted by Morris the Cat View Post
Common problem when the gearbox sprocket leaks oil out and down behind the primary side.

How it would weep out of the crossover l/h gearchange bracket that runs thru the cover is a mystery. . .

There is an o-ring to be usedto help seal this problem,

Problem is - you have to go in deep to get to it.

The rather large o-ring is the same part # as is a Trident something or other?

Memory fades. . .
Morris that's a different problem from what I have and that one has been worked out. I have some other threads that go down that rabbit hole but figured out it was my 5th gear that had worn...no more gear oil out the sprocket area.
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Old 12-09-2012, 01:55 AM   #8 (permalink)
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Seems very strange. Even if a lot of gearbox oil was making its way along the crossover shaft into the chaincase, it would surely first of all run into the bottom of the case and come out of the drain hole (which you say has the plug removed). There seems no rational reason why it should progress horizontally (or even at a slight angle if leaning to the left) along the 'U' portion of the shaft and then the final straight piece to the outside world!

I suppose if there is greatly excessive clearance between the shaft and the bore in the chaincase cover, any internal pressure could cause any oil mist to escape (if it weren't for the fact that no pressure could build up if the drain plug has been omitted). So sorry, no idea, but please do let us know when you've sussed it!
JohnA, the problem isn't that the gear oil builds up in the primary, it's that gear oil comes out the foot change spindle hole, drips down and out my primary case drain plug holes and then sprays all over the side of my bike when riding or creates a puddle of oil when parked. Getting the gear oil to not come out of the spindle hole is the goal here.
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Old 12-09-2012, 07:39 AM   #9 (permalink)
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If the oil level is above the crossover shaft when the bike is on the sidestand, you could probably just use less oil in the gearbox, or use the centre stand.

I don't know though. Once you leave factory spec behind and make "improvements," you're on your own.
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Old 12-09-2012, 05:10 PM   #10 (permalink)
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I think I see now: So you're saying that the oil comes out of the hole in the crankcase that's behind the clutch drum, where the crossover shaft emerges before its 'U' piece? This hole should have an iron bush at each end - best to make sure these are in place.

So, after the oil has come out of this hole, it then finds its way out of the drain plug-hole (the plug from which you have removed), and from there splatters all over the place or forms a pool if you park the bike on the sidestand?

Well, no significant quantity of oil should get through that shaft bore. It shouldn't be above the level of the bore at the gearbox cover end, and the gearbox shouldn't build up enough pressure to force oil through what should be the very small gap between the shaft and the iron bushes.

Have you got no more than 500ml of EP90 gearbox oil in the box? Do you know whether those iron bushes are ok? There should be NO appreciable slop between the shaft and the bushes at either end.

If I've understood the problem correctly and if all the above is AOK, I'm certainly stuck for ideas!
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