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I’m cleaning up parts and looking over the water pump.
There’s a fitting (above the cam shaft driven piston)
with a check ball on top that the discharge
line attaches to. Below the piston there’s another
pipe thread in the housing that I’m assuming should have
a screened fitting with a check ball inside that would
be the "intake" of the water pump.
Looking at my photos before and after disassembly,
I see no such part.
Anybody have any good ideas on making such a check valve
with screen, if that’s indeed what I need?
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Prepare to be boarded!
Yes it is simple ball check valve made from 9/16" brass hex stock.
The OAL length is 1 9/16" long.
The through hole I.D. above the ball is .35" This does not go all the way to the bottom, but provides the taper for the ball to rest on (shut off)
The hole size under the ball is not kown? but should be smaller than the ball O.D. maybe 3/4 size of ball O.D. This hole connects to the six inlet holes.
The Ball Diameter is 3/16 – 1/4 " aprox?
The cross pin is close to a #35 drill size made from brasss rod pinned or staked to prevent movement. (You could also solder or braze)
Location is .620" down from the top (thread side)
The water inlet are six holes drilled on each side of hex a # 39 drill is a good fit, hole location 1.35" from top (thread side)
Thread size is 1/2 X 18" check your motor to be sure .50" length.
There is no cover screen on mine!
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Hi Buccanneer,
Yes this water pump design uses two check balls (Valves) Upper and lower
The hole size under the ball in the upper check valve is close to a #14 drill
Remove your water line and you will see the upper check valve if you have
Not done so already.
The upper check valve closes (seats in the closed postion same as the lower)
In other words the upper is the same design minus the intake holes. The cross pin is facing up.
See Pics below.
The upper check valve has been error proofed at the factory with fine threads at top and
course threads on the bottom. both check valves are closed (Shut off) in the down position.
I wonder who gets credit for error proofing this upper check valve?
Was it Thornwald Hansen president of Thor or
Elmer "Carl" Kiekhaefer?
Yes I think they did not use a screen for two reasons!
1) cheaper to manufacture (less parts & labor to install)
2) less prone to clogging and easier to clean if clogged with mud debris etc..
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This should explain piston pumps in more detail.
https://www.globalspec.com/learnmore/fl … nger_pumps
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