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How to diagnose an overheating B16? 444-544 1961

posted by  someone claiming to be mario on  Sun Oct 14 08:03 CST 2001 [RELATED]

I have a 1961 P210 with a B16 engine. I have been having problems with this thing for quite some time though sometimes it is better than others. I believe that it performs best in the cooler months than the hotter ones.

Here are the symptoms. The car starts fine and runs pretty well while it is warming up. It will drive strong for a while until the temperature needle hits the mark which seperates the middle range with the upper range on the temperature gauge. After about ten minutes with the needle at that mark, the car will begin backfiring out of the carbs upon any sort of load. So I believe that my engine is getting too hot and it is preigniting. Also, when it is this hot and I go to turn off the engine, it will diesel and often it will give me a nice loud backfire out of the exaughst.

Engine info: New plugs, wires, cap, rotor, points, condenser, and air filters. The carbs are tuned and balanced, (well they are tuned well when the engine is warm (upper end of the middle range of the gauge)). Dwell was in spec, timing also. Radiator is full of coolant. When the engine is warm I can grab the fan blade and with a good amount of force I can turn the fan a bit due to the belt slipping on the crankshaft pulley (that seems tight enough to me, is it?). Water is getting circulated.

So what should I be testing to figure out this problem? What are the possible causes and how can I check them?

I can provide more information and pictures if necessary.

Thanks,

mario





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