Cylinder drain cocks

Cylinder drain cocks

This topic has 3 replies, 4 voices, and was last updated 18 March 2025 at 19:21 by Clive Brown 1.

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18 March 2025 at 17:00 #789382
Steve101
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@steve101
I’ve made a couple of taper plug drain cocks to fit a Stuart 10V. On test under water pressure (up to 60psi) its pretty obvious they leak when closed. I had a similar result from commercially made taper plug cocks for this engine.

I’m new to this so would like to know whether its fair to expect drain cocks of this type to hold a constant water pressure or whether the conditions resulting in an engine running on steam need less of a seal.

Steve101
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18 March 2025 at 17:25 #789389
bernard towers
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@bernardtowers37738
I think you may find that its matching taper problems. I have made some in the past and found that lapping before bending the handle pays dividends. i use a very old tin of lapping past made by the CARBORUNDUM Co.
18 March 2025 at 18:45 #789405
Harry Wilkes
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@harrywilkes58467
Ive used Brasso on mine

H
18 March 2025 at 19:21 #789408
Clive Brown 1
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@clivebrown1
With its slide valve a 10V doesn’t really need working draincocks.
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