we have a 120M at the shop. running a CAT 6.6 ACERT
it will start and run fine until the observed coolant temp gets to around 170+/-deg. and you shut down the grader, it will not die and will run fine all day as long as it is kept running.
once shut off it will not start again until the observed coolant temp cools down to 140+/-deg, then it starts fine and runs fine again.
fuel rail pressure will not climb above 2500+/-psi on start up when hot (book says it needs 3625psi to start)**reason we replaced the injection pump/same issue with new pump**
we have gone through the CAT ETM and done every test and check there is.
we have replaced the cam and crank sensors, replaced the injection pump, reflashed the ECM numerous times. swaped out the booster fuel pump/water sep. with another vehicle.
their are only two things left to replace.... and the book says to replace one or the other depending on which test you perform....
ALL 6 injectors and lines.... or the Engine ECM....
We have even had a CAT mechanic that is there for our warrenty equipment, ponder over and help check it out, he too is at a loss....
it will start and run fine until the observed coolant temp gets to around 170+/-deg. and you shut down the grader, it will not die and will run fine all day as long as it is kept running.
once shut off it will not start again until the observed coolant temp cools down to 140+/-deg, then it starts fine and runs fine again.
fuel rail pressure will not climb above 2500+/-psi on start up when hot (book says it needs 3625psi to start)**reason we replaced the injection pump/same issue with new pump**
we have gone through the CAT ETM and done every test and check there is.
we have replaced the cam and crank sensors, replaced the injection pump, reflashed the ECM numerous times. swaped out the booster fuel pump/water sep. with another vehicle.
their are only two things left to replace.... and the book says to replace one or the other depending on which test you perform....
ALL 6 injectors and lines.... or the Engine ECM....
We have even had a CAT mechanic that is there for our warrenty equipment, ponder over and help check it out, he too is at a loss....
2012 CAT 120M no hot start
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