2007 Isuzu NRR Box Truck
5.2 L Diesel 4HK1TC
THE MOTOR RUNS BUT HAS A KNOCKING SOUND. IT SOUNDS LIKE IT IS COMING FROM THE TOP END.
I shut off the motor as soon as I heard the sound. A mechanic took the oil pan and the valve cover off and said it all looked good, put new oil in the motor. He drained the fuel tank put a new fuel filter on and put fresh fuel in the tank with an additive. The sound is still there and not smoking out the exhaust.
I HAVE A VIDEO OF IT RUNNING THAT I CAN EMAIL TO YOU.
Auto transmission
254,600 miles
20 ft box
inside height is 8"-1
Aluminum ramp
Tires are in great condition
Am/fm cd
A/C heat
Power windows
Power locks
Cab roof vent