[TR] Water pump housing inlet/outlet question

[Q]

The water bypass hose nipple on the water pump housing got smaller and smaller during the production of the TR3 TR4 series.  Generally you want the smaller sized opening as more water runs through the radiator that way.  

Many owners add small washers in the bypass hose to restrict the flow of water through the by pass circuit to help solve overheating problems.

Edward Hamer
Petaluma CA