Water pump problems with a 102

[Rob Ripley]

Tank test today of the woodturned/garden stake/bush/water seal.
Brmmm, brmmm, healthy Seagull roar (and smoke) .....
Does it work - NO !!!!!!

I'm off to Canada for 5 weeks, so I'll just hide it in the shed, and re-consider using a spare 40+ gearbox like I have on another 102.[attachment=0]00005.jpg[/attachment]

[Charles uk]

Rob this is very unusual behaviour for a 102, I still think you must have a partial blockage somewhere further up the cooling system.

The chances are that if it's not the water delivery tube your, cylinder has coronary thrombosis, 99% of cylinders die of this!

[Rob Ripley]

[i]I still think you must have a partial blockage somewhere further up the cooling system.[/i]

But the telltail outlet is spouting furiously ...

[i]The chances are that if it's not the water delivery tube your, cylinder has coronary thrombosis, 99% of cylinders die of this![/i]

I did not want to read that .... I guess it's time for a full strip and check.

[StephenRT]

Rob.Your photograph seems to show a very good flow of water from the telltale,have you checked that the outlet into the silencer is clear?
You could unscrew the feed pipe to the telltale elbow and see if that makes a difference.
Steve

[Rob Ripley]

Hi Steve,
[i]...Your photograph seems to show a very good flow of water from the telltale,have you checked that the outlet into the silencer is clear?[/i]
Not yet

[i]...You could unscrew the feed pipe to the telltale elbow and see if that makes a difference.[/i]
Yes, that looks like the task for tomorrow
Rob

[Rob Ripley]

The saga continues -
As suggested, I removed the outlet pipe from the exhaust - good stream of water, but no difference to the water pumped out the relief holes in the drive shaft tube. So I tried my other motors - Even though they had not turned over for months, each started first pull, a bit smoky (I also add a dash of molybond in the oil/fuel mixture)
Century 100 - Pumping fine (a little less as I also have a water outlet inside the exhaust tube)
40+ - pumping fine
102 (with the 40+ gearbox) - pumping fine.

I might have another look as fitting a flexible oil seal.
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[StephenRT]

Rob.I have been looking at your photograph of the green painted gearbox that you are using.Even with the photograph enlarged and lightened I cannot see that there is a pressure relief hole on the side of the impeller chamber,it should be in line and below the topmost grease nipple,is there one?

[Rob Ripley]

Is it the screw head?
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[Oyster 49]

Rob,

It looks like the pressure relif hole is filled in with something. Scrape the green paint back carefully and see what is there. I have 2 SDs, an AC and 2 spare SD bottom ends, and they all have this feature. The SD I recently rebuilt has the pressure relief hole, but is fitted with a drive leg that does not have the "bobbin" bush fitted. When running there is no water going up the drive leg, but a good jet of it coming from the pressure relief hole.

My later AD bottom end has no pressure relief hole. I don't know why this is.

I suspect the blocked pressure relief hole is your problem.

[Oyster 49]

It does look like a screw in that hole. Whip it out and problem solved I think...

[StephenRT]

If that is a screw then it should not be there,I think this is the reason for your problem.
Steve

[Rob Ripley]

There is a screw fitted and try as I might, I cannot remove it. I can see remains of the thread inside the pump housing. I guess I'll drill another hole alongside it.
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[timer]

Please don't stop coresponding until you reach a satisfactory conclusion. This saga is better than a whodunnit book and I'm holding my breath for a happy outcome. I thought these sort of impossible problems happened to me!
Two years ago I replaced the oilseal and cover on my 40+ with clutch. I destroyed the cover taking it off. I bought the oilseal and cover from John and rebuilt it. The clutch wouldn't work properly and I spent hours (and I mean HOURS) trying to solve it - I thought i was totally incompetent. It turned out that the new cover was deeper than it should have been and John found a few more rogues in his bin. I was the first to spot it. With the correct cover it works perfectly. John kindly supplied the new one FOC (and chucked the rogue ones). So its not always the obvious.
"Both you and the engine know it is going to work. What neither of you know is "when"" (zen + motorcycles I think)
Good Luck - I'll keep reading!

[Rob Ripley]

The Saga continues ....
I drilled a hole, re-assembled the leg, primed the carby for another test run
The carby fell apart
Rummaged in the 'bits box' and found another carby body ... but could not find the key I use the change the jets.
However, all this is on hold 'till I get home (I'm typing this from a hotel room in Pudong Airport, Shanghai).

[charlesp]

I have a similar problem with an SD. The lower 'cotton reel' bobbin type bearing was removed, the pinion shaft was so corroded it wasn't acting as a bearing, if you see what I mean. I took advice from my chum (who for years ran Seagull's repairs department), he told me that bearing could safely be omitted.

When the motor runs it's the same symptom that you describe; when you rev the thing you get jets of water whooshing out of the tube that would put the kids' SuperSoakers to shame.

My temporary fix was a couple of turns of insulating tape. My gearbox has the pressure relief hole.

I now have an FV that does the same. The FV in question has no blockages in the waterways -= that's one of the power heads that you can see right through, so there's no pressure building up there.

I do hope we get to the bottom of this. I am tempted to blame Global Warming, Illegal Immigration, or News International. Sadly I can't fix any of them in my workshop...