Trying to finish up a complete frame-off restoration of a 1979Fj40 - its basically all back together and "drive-able" except for 1) an overheating problem and 2) a carb adjustment issue. Some background - the 2F engine was rebuilt with new crank, rings, bearings, etc. - have good oil pressure.
Now about the overheating issue -- all new hoses/clamps, belts, and thermostat. Prior to rebuild the engine ran "cool". I've since replaced the radiator and radiator cap - still no luck -- truck warms up within about 4-5 minutes to normal range but then temp continues to gradually but steadily elevate to very close to the "H" range. Radiator does not "boil-over". No leaks from the water pump or anywhere else. Radiator hoses on top and bottom are quite hot to the touch.
Short of replacing the water pump - any suggestions to trouble shooting this? I thought about replacing the temp sending unit that screws in to the manifold just to be sure it is functioning correctly. Only other things that come to mind are the fan clutch (it was working prior to rebuild so don't think this is the problem) and the temp guage in the cluster itself. With no leaks or screeching from the water pump - any way to easliy check its performance? Suggestions welcomed.
#2 - carb issues - finally got the distributor back in and the timing set darn close. The factory carb was completely rebuilt. Engine cranks easily and runs fine as long as the choke is 3/4 out -- if not then gas pedal has to be pushed down to keep engine RPMs up or it will stall. Even when the engine heats up (see above) still must have choke pulled out to "idle". Sounds like a fuel problem to me but I've adjusted the fuel mix and idle screws per factory manual...I've also plugged all the carb vacuum ports to avoid any suspected air "leaks". What next?
Thanks for any help sent this way, Tom
Now about the overheating issue -- all new hoses/clamps, belts, and thermostat. Prior to rebuild the engine ran "cool". I've since replaced the radiator and radiator cap - still no luck -- truck warms up within about 4-5 minutes to normal range but then temp continues to gradually but steadily elevate to very close to the "H" range. Radiator does not "boil-over". No leaks from the water pump or anywhere else. Radiator hoses on top and bottom are quite hot to the touch.
Short of replacing the water pump - any suggestions to trouble shooting this? I thought about replacing the temp sending unit that screws in to the manifold just to be sure it is functioning correctly. Only other things that come to mind are the fan clutch (it was working prior to rebuild so don't think this is the problem) and the temp guage in the cluster itself. With no leaks or screeching from the water pump - any way to easliy check its performance? Suggestions welcomed.
#2 - carb issues - finally got the distributor back in and the timing set darn close. The factory carb was completely rebuilt. Engine cranks easily and runs fine as long as the choke is 3/4 out -- if not then gas pedal has to be pushed down to keep engine RPMs up or it will stall. Even when the engine heats up (see above) still must have choke pulled out to "idle". Sounds like a fuel problem to me but I've adjusted the fuel mix and idle screws per factory manual...I've also plugged all the carb vacuum ports to avoid any suspected air "leaks". What next?
Thanks for any help sent this way, Tom