Ok so I've finally got around to finishing that pre-circulation pipe on top of the water pump. What it does, is it allows the water to circulate inside the motor through the waterpump before the thermostat opens. The way the thermostat is designed, it has the normal hole that is closed when cold, but it has another level which opens the pre-circulation circuit when cold. When it starts to open, that second level closes the pre-circulation circuit and opens the main cooling circuit.

This is what it looked like before



And what it looks like now, notice on top of the waterpump. Now All I need to do is add a rubber pipe between that fitting and the one that just out from beneath the top water housing.


I silver soldered a piece of the original pipe to another bent one I had, and added the little bracket with the hole. Then I drilled and tapped a hole into the water pump which takes a 6mm bolt to hold the lot in place. The piece of pipe that goes into the waterpump has a groove at the bottom and a rubber o-ring which seals the water in.



Maybe a picture would explain it better... :)


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