Warm humid coastal air......
...... and the engine is not running hot enough.
My 261 with a cardboard infront of the rad can hardly get above 162-5 degrees with the 160 thermostats....... I will no doubt replace with a 180 F
If water boils at 210 F .... you need to have the engine hot enough to evaporate the water vapour..... which should be sucked out in the PCV connection on the 261. Now your engine oil will always be about 40 to 50 degrees hotter than the coolant...... Most older engine suffered from sludge deposit which in combination with a high ash content in the older oil and water vapour would actually plug up the oil return openings in the overhead engines.... a 1/4 in. thick deposit was not unheard of.
Harry...... are you running some kind of PCV system on your engine..? and how hot does your engine run up to....? have you used the hand held infrared thermometer from Princess...?
The Dodge flat head six had the same problem...... could hardly get it to heat up....... and never boiled over....
Bob
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
Last edited by Bob Carriere; 29-05-12 at 22:18.
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