Diesel Engine Troubleshooting

Coolant is drawn into the inlet of the front cover and then flows from the water pump through the front cover to the crankcase.

Coolant is also routed from the front cover into the crankcase to a passage that feeds the oil cooler.

Return coolant is directed to the thermostat by the front cover. If the thermostat is open, coolant flows to the radiator to be cooled. If the thermostat is closed, coolant is returned to the water pump via a bypass circuit in the front cover.

Ford F Cooling System Flow Diagram

The bearing surfaces on the crankshaft are induction hardened.

During the hardening process the surrounding areas of the crankshaft discolor.

This condition is normal.

A single mass flywheel is used on the F-450/550 Superduty trucks.

The single mass flywheel can be identified by the absence of the above mentioned parts and that it is machined from one solid part.

The 6.0L Power Stroke uses two different flywheels for the manual transmission.

A dual-mass flywheel is used on the F-250/350 Superduty truck.

The dual-mass flywheel can be identified by springs located around the flywheel on the engine side.

It can also be identified by an extra ring of bolts on the transmission side of the flywheel that holds the two masses together.

From the side it can be identified by the separation between the clutch surface and the starter ring.

The geartrain for the crankshaft, camshaft, and high pressure pump are located in the rear of the engine under the rear cover.

This allows the high pressure pump to be mounted inside the engine and also reduces geartrain noise.

The 6.0L POWER STROKE uses a four (4) valve per cylinder head design to increase air flow and efficiency.

For identification, the exhaust valves are smaller than the intake valves.

The aluminum rocker arm carrier is mounted on top of the cylinder head and is held in place by the cylinder head bolts.

The rocker arm carrier provides the mounting location for all of the rocker fulcrums.

The carrier also provides the connector pass through for the injector and glow plug.

1) EGR Valve
2) EGR Cooler
3) Turbocharger Compressor Outlet
4) IAT2 Sensor
5) EOP Switch
6) EOT Sensor

1) Oil Filter
2) Turbocharger Oil Supply Line
3) EVRT/VGT Control Valve
4) Injector Connectors
5) Secondary Fuel Filter
6) EGR Cooler Coolant Deaeration Port