Just installed my rebuilt XPAG engine and am having problems keeping it
cool. Engine rebuild included cylinder resleeving, new bearings, new
3/4 race camshaft, new valves including valve guides and hardened
seats. Above work was done by a local machine shop and I assembled the
major parts and installed the engine.
Symptoms: Engine starts and runs fine for first five miles then
temperature continues to increase until coolant boils (gauge reads 185 C
but doubt its accuracy as coolant should be good to about 265F. It
appears to me that the engine is putting out more heat than the cooling
system can absorb.
The water pump appeared normal on installation.
The radiator was tested and cleaned by a local radiator shop with no
discrepancies noted.
Thermostat was tested and opened normally. I then cut out the center
part of the thermostat and reinstalled just the ring. This helped by
slowing the rate of temperature rise but end result was still the same.
Any ideas on what could be causing this? Could it be from all the new
parts, the camshaft etc.? I am just driving it short distances until
this gets resolved. Total miles on the rebuild now is about 65.
Incidentally air temperatures have been in the 90's the last couple
weeks.
Bob Peck
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