Ford 460 motorhome running hot
Hello again everyone! Just wanted to check in after all the recent repairs with a new and exciting issue! Haha well kind of new. So the 460 engine in my 1988 ford E350 motorhome is running pretty...
Forum Discussion
If the plugs all look identical that rules out individual cylinder problems, rings, piston, valves, plug, plug wire, fuel injector.
Your then looking for a problem that affects all the cylinders, fuel pressure, timing, cooling system.
You mentioned you have an accurate remote temperature probe that is showing a high water discharge temperature from the engine. Can you move it to measure water inlet temperature, Radiator outlet temperature?
A high reading, say above 170 when the outlet is 200, indicates a lack of air flow, fan clutch not working or bugs/dust clogging air channels, or a large fraction of water channels plugged resulting in high velocity flow in the remaining channels with little temperature drop.
A low reading, say less than 150 with outlet of 200, indicates low water flow, closed thermostat, plugged up or broken water pump, inlet hose collapsed under suction. It may self regulate at 220 because system pressure inflates the collapsed hose.
BTW, when my engine was running rough, not overheating, the problem was oil and dirt contamination on the timing pickup sensor and toothed wheel in the bottom of the distributor head. The clue was timing light jumping around randomly over 20 degrees.
Your then looking for a problem that affects all the cylinders, fuel pressure, timing, cooling system.
You mentioned you have an accurate remote temperature probe that is showing a high water discharge temperature from the engine. Can you move it to measure water inlet temperature, Radiator outlet temperature?
A high reading, say above 170 when the outlet is 200, indicates a lack of air flow, fan clutch not working or bugs/dust clogging air channels, or a large fraction of water channels plugged resulting in high velocity flow in the remaining channels with little temperature drop.
A low reading, say less than 150 with outlet of 200, indicates low water flow, closed thermostat, plugged up or broken water pump, inlet hose collapsed under suction. It may self regulate at 220 because system pressure inflates the collapsed hose.
BTW, when my engine was running rough, not overheating, the problem was oil and dirt contamination on the timing pickup sensor and toothed wheel in the bottom of the distributor head. The clue was timing light jumping around randomly over 20 degrees.
