Chris,
Malcolm is on the money, you have described to a tee the classic symptoms of a
partially blocked radiator and you wont fix it any other way than a full strip
down, system flush, fit the thermostat (either) and the correct proportion of
an A grade coolant. The only difference a cooler thermostat makes is it takes a
tad longer to get hot - btw how hot is hot; you can run a L powered 510 all day
on the track with a 253 Torana thermostat at 210F and not hurt a thing -
problem is around town with stop/start stuff you can't run much past 195F ("P"
on 70+ dash) as you will suffer from vapour locks and detonation etc. as the
under bonnet temps get up out of control.
Terry
malcolm cooper wrote:
> Just thinking?
> If the rad was half blocked ,and,if you have the thermostat in thats
> even less water flow through the engine so it might heat up.
>
> Half blocked rad no thermostat = more water flow thru engine,hence runs
> colder.
> Does the engine over heat with out the thermostat at speed?e.g 80Mhp.Or
> does it run even colder??..
>
> What type of water pump and fan do you use?
> I found the visc's(what ever) fan ,the engine runs hotter at high speed
> than it would if it had a 510 fan on it.
>
> Malcolm
>
> Chris I Dobbins wrote:
> >
> > Has anyone expereinced a problem like this:
> > Without a thermostat, my 510 runs cold even after an hour in traffic.
> > With a thermostat, it overheats in about 10 minutes. I have tested the
> > thermostat in a pot of water on the stove with a thermometer and it
> > works. The water pump is brand new. If I take off the radiater cap
> > without the thermostat in place I can see water flowing through well, but
> > with the thermostat in the water doesn't move at all. The lower radiater
> > hose is not collapsing and neither are kinked. I just seem to never get
> > the thermostat to open in the car. The car had 190 degree Farenheit
> > thermostat when the trouble started. I replace it with a 180 and it is
> > still there. So right now I am driving it without a thermostat. The car
> > doesn't have any major modifications and everything else seems to be in
> > excellent shape. How do I fix it?
> > Thanks,
> > 1969 Datsun 510 wagon
> > Chris
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> >
>
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