Got an overheating question I was hoping someone might be able to shed some light on. The car's a 1969 RT-40 Toyota Corona with an auto transmission and a 1500, 2R engine.
On an interstate drive a month ago I got serious overheating problems. Granted it was pretty hot outside for most the trip, but I boiled it a few times and I've never had over heating probs with this car before. The problem arose after some time, too. It was not an issue until I'd covered a few hundred kms. More so, I'm not sure I've got rid of the problem yet. Basically, it runs above the normal operating temp at speeds over 80kms (50mls) per hour. Getting normal operating temps running around the suburbs, but not out on the highway.
Originally thought it was a cooling problem. Took out the thermostat. This brought the temps down a bit, but it's still too high at higher speeds. The water pump is new and I've got loads of water passing over the top of the radiator core. The fan belt is tight and the radiator core is only about three years old. So, I'm guessing that the cooling system is okay.
Now, I've just checked the timing with a strobe light and discovered it was significantly advanced, so I've returned the timeing to 8*BTDC. I'm yet to test the car. Will do so on the next hot day.
Seeing as I don't think the problem is due to cooling and the timing was out, could some please confirm the likelyhood of the timing causing the problem and why does advanced timing cause temps to rise at higher speeds?
All input appreciated.
Cheers,
Matthew.
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Monday, February 26th, 2007 AT 1:55 AM
