Posted by BradFr on July 15, 2014 at 19:24:41 from (67.247.74.55):
I am trying to diagnose an issue with a new tractor that I bought at an auction. The problem is after working the tractor for about 30 minutes with a bush hog or box blade the tractor will lose power and begin to sputter and try and die under load. If i remove the load on the engine it will come back to life.
I started to try and fix the problem with a full tune up that included:
-carb rebuild(including screen on inlet)
-blew out all fuel lines
-pulled fuel bowl and cleaned/checked screen
-tested fuel pump flow(seemed sufficient)
-new condensor
-new coil
-new plugs and wires
-tested t-stat opening in boiling water(good)
-compression tested each cylinder cold(one cylinder was at 90psi the rest were 120 or so)
I know for a fact the exhaust manifold is cracked, I can hear it when running the tractor.
After all of this I am still seeing the same issues. My next thought was it might be overheating, my gauge does not work so it is hard to tell. The last time it sputtered I pulled the radiator cap and was surprised to see there was no pressure and coolant to the proper level. I thought at the very least there should be pressure in the radiator.
After the radiator check I decided to remove the radiator and water pump for closer inspection. The radiator has good flow through the inside and no sediment came out. The fins were definitely dirty and needed a good cleaning.
Next I tested the water pump, before fully draining the system i removed the t-stat and started the tractor without the radiator connected. I expected to see water come shooting out of one end of the water pump but it did not, a slow 1/4" stream came out. I also shoved a garden hose in each side of the water pump and flow did not increase at all.
Does the weak flow from the waterpump seem normal? Shouldn't the radiator have some kind of pressure when the tractor is up to operating temperature? Any other thoughts on what to look for to diagnose my original issue.
This post was edited by BradFr at 19:40:28 07/15/14 2 times.
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