[Mgs] mga overheating

[Paul Hunt]

I'd say it was a cooling issue that caused the oil pressure to drop.  Newly 
rebuilt engines will run hotter than fully run-in as they are usually 
tighter.  Crank stiffness should be checked with the plugs out.  But 
something as simple as the thermostat not opening could have caused it, so 
warming up from cold keep feeling the top of the rad, it should stay cool as 
the temp gauge needle rises, then suddenly get very hot when the needle is 
around the 180F point, depending on what stat is fitted.  If that happens 
then you need to check the radiator with an infra-red thermometer.  Look for 
any cool spots which could indicate a blocked core, and compare the outlet 
temperature with the inlet.  A big difference indicates lack of circulation 
through the core, possibly from a blockage anywhere in the circuit, or a 
problem with the pump.  A small difference indicates too much heat is being 
generated by the engine for the radiator to dissipate.  Causes can be 
retarded timing, mixture problems, as well as the stiffness mentioned 
previously.

PaulH.

----- Original Message ----- >I took a test drive last night about 4 miles 
after finaly getting my 1957, 1500 mga running. Engine starts fine seemed to 
run good on the road and then I noticed the temp rising and the oil preasure 
dropping. Temp when all the way up. Oil preasure about 15lb.