Is It Overheating - 2F ??

[tlc_4play]

I'm still running the rebuilt 2F in - so yesterday I decided to take it for a 200km long slow (80kph) cruise, admittedly it was fairly hot day, the ambient temperature yesterday was about 34-36deg C.

When I got home I flipped the hood for a look see - and had two concerns;-

1. There was a gurgling sound and coolant was boiling / escaping into the radiator header overflow/vacuum bottle . I immediately went to check the temp guage and it was bang in the middle .
The radiator has been reconditioned and the block and head water jackets were thoroughly flushed by the engineering shop when I did the motor rebuild, and, new waterpump, temp sender, hoses, thermostat and thermostat rubber were fitted.

2. I fitted ceramic coated headers;- but there appears to be an exessive amount of heat build up under the hood on the headers side of the engine compartment. Is this normal

 

[FJ40-GARAGE]

Nothing there?

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Sounds to me that you got a leak somewhere.

 

[Buckwheat]

Check coolant temp

The conditions you're describing sound normal to me. If the temp gauge is in the middle between the upper & lower range, it is probably OK. The only way you can be sure is to dip an analog thermometer into the coolant, or use a non-contact digital unit to sense the temps at different places, like the radiator, thermostat housing, overflow bottle, freeze plugs, or hoses. Bear in mind, though, that all that internal engine heat that is being exchanged through the cooling system suddenly has no place to go when the coolant stops cycling through the radiator. It is perfectly normal for a sudden rise in temperature to occur upon shutdown, to the point it can boil the gas out of the carb bowl or in the fuel lines in some vehicles, a common condition called hot-no start. You can do a chemical block test to check whether combustion gases are getting into the coolant, if you need to set your mind at ease. The kit costs about 50 USD & I have never seen it fail. The headers run at 3-400 degrees F, so I'm told, so underhood temps could easily get that high.

 

[65swb45]

The conditions you're describing sound normal to me. If the temp gauge is in the middle between the upper & lower range, it is probably OK. The only way you can be sure is to dip an analog thermometer into the coolant, or use a non-contact digital unit to sense the temps at different places, like the radiator, thermostat housing, overflow bottle, freeze plugs, or hoses. Bear in mind, though, that all that internal engine heat that is being exchanged through the cooling system suddenly has no place to go when the coolant stops cycling through the radiator. It is perfectly normal for a sudden rise in temperature to occur upon shutdown, to the point it can boil the gas out of the carb bowl or in the fuel lines in some vehicles, a common condition called hot-no start. You can do a chemical block test to check whether combustion gases are getting into the coolant, if you need to set your mind at ease. The kit costs about 50 USD & I have never seen it fail. The headers run at 3-400 degrees F, so I'm told, so underhood temps could easily get that high.

What he said.

Also consider that the factory guage isn't very accurate.

 

[tlc_4play]

When The motor was rebuilt - everything was replaced with new - right down to the freeze plugs (called welshplugs here). Most of the freeze plugs were replaced with new stainless steel plugs, except two which were brass.