Rblt 64 327-250 Overheating Issue - Help!

[Andrew P.]

Re: Rblt 64 327-250 Overheating Issue - Help!

That's not what I said... Attach the Stant pressure checker to the system in lieu of a rad cap. Run the engine and watch the system pressure gauge on the pressure checker. It should climb to a level BELOW the rad cap's rated release level (should be 13 lbs) and STAY/MAINTAIN that pressure level.

If pressure continues to rise and crosses the 13 lb level, you've got leak(s) somewhere in the cooling system. Find and fix.

If pressure DOES stay and maintain BELOW the rad cap's release point. Now, attach the adaptor to the Stant pressure checker and exercise/verify the integrity of the rad cap REGARDLESS of how new it is...

Hi Jack,

I'll have my mechanic check it out.

Andrew.

[Pat F.]

Re: Rblt 64 327-250 Overheating Issue - Help!

For what it is worth, upon a complete rebuild on a 427 for a 1966 we found that the new temperature sending unit was not calibrated for the old temperature gauge. If you have a heat gun, see what the temperature is at the water neck and then compare it with you gauge. My friend who knows stuff, created a resistor in the line to the sending unit and then the gauge agreed with heat gun. It was not overheating as we thought.

Just a thought.

[Joe C.]

Re: Rblt 64 327-250 Overheating Issue - Help!

Look in the archives, and examine all of the usual suspects (this phenomenon has been discussed ad nauseam): sender/gauge/timing/heat riser/water pump/collapsed hose/blocked passage/radiator/fan clutch/fan location in shroud/thermostat/fan shroud sealing/coolant level/"burping" /"puking"/air fuel ratios/etc, etc.

If none of these solve your problem, then I am loathe to tell you that an engine builder with less than sanitary habits, or a "measure once and cut twice" attitude rather than a "measure twice and cut once" one can create a low-output-heat-generation-machine for an engine.

[Duke W.]

Re: Rblt 64 327-250 Overheating Issue - Help!

Adding coolant through the radiator???

It should self purge air easily by itself.

Most in this thread have given you suggestions, but we get no hard data. Asking a "mechanic" to check the "spark advance map" and then having him say "it's okay" is about as useful as throwing a bucket of water on forest fire.

It's unfortunately, but there are very few competent mechanics out there that can do any kind of diagnostic work on vintage cars.

If you don't have the skills or tools yourself you can be at the mercy of bubba.

That's what local chapters are for. There is probably someone in yours who understands this stuff and can help you out with some diagnostics.

I've taken my dial back timing light, vacuum gage/pump, and dwell meter to chapter meetings and taken spark advance maps on the spot. It takes me about two minutes to do the map, determine if it is OE (or suitable for the engine configuration), including testing the VAC. It takes longer to set up and tear down the equipment.

I almost always find a problem, and they are usually simple and easy to fix.

Duke

[Rick C.]

Re: Rblt 64 327-250 Overheating Issue - Help!

"A slight flat-spot in accelleration"

I had a similar issue with my 60 recently. My problem turned out to be the timing and timing advance. Combination of issues. Harmonic balancer was "wrong", weights in distributor were sticking and wouldn't advance. Car ran "ok", but not great. Once I fixed the timing my overheating stopped.

From the "for what it's worth" category...

Rick

[Neal K.]

Re: Rblt 64 327-250 Overheating Issue - Help!

I too had a similar problem with the same symptoms and it turned out to be trapped air.
Neal