Betta311 Posted October 1 Report Posted October 1 I have a 1970 Datsun roadster with a completely new engine build using the best parts. However, I’m getting some over heating issues and can’t figure it out. Can anyone recommend a person or shop that works on 311 Roadsters? I want someone with more knowledge than me to find my over heating issues and dial my roadster in. Any help would be much appreciated. Thanks Quote
mtngoat Posted October 3 Report Posted October 3 Greetings and welcome aboard. Your best resource for Roadies is 311s.org, which has a crap ton of detailed tech info, including what is probably a common issue you're facing. You may find some help here too, knowledgeable group here as well, merely not as specialized as 311s.org Quote
datzenmike Posted October 3 Report Posted October 3 Like boiling over hot or just running hot? Get an IR gun and shoot the top radiator hose and get a real world number. If 185-190F could be the temperature sender or the gauge reading wrong. Does the gas gauge read high also? If it is actually running hotter than it should, change the thermostat. Spend $10 on a good one. Could be simply a stuck thermostat. If none of the above, running hotter than normal is usually one of two things. Lack of air flow through the exterior radiator or lack of coolant flow through the interior of the radiator. Lack of air flow... 1/ Lose or glazed fan belt slipping. 2/ External radiator fins blocked by bugs or debris. 3/ Slipping clutch fan, if equipped. Lack of coolant flow... 1/ Bottom radiator hose is soft and collapses from pump suction when revved up. 2/ Internal build up of hard water scale blocking radiator tubes. Runner up... 1/ Heater core leaks and heater hoses were joined together to by pass it, but coolant is allowed to flow through them. Coolant flow must be stopped if hoses joined together. 2/ Head is not flat and head gasket has failed to seal. Compression is leaking into water jacket. May show as excessively steamy exhaust when warmed up, smell of anti freeze. Unexplained loss of coolant and needs topping up. 3/ Retarded ignition. Most of the heat of combustion is going out the exhaust ports rather than pushing down on the pistons, transferring a lot of heat into the cooling system. 4/ Can timing too advanced, opening exhaust valve early dumping hot exhaust out the ports and into the cooling system. Quote
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