Can anyone tell me if the blocks on the 5.9 24v engines the same from 2001 or so up to 06? Are the cranks rods etc also the same?

 

The blocks and pistons are different in those years as are changes to the head, valves and seats....SO and HO engines also had some potential piston variations over the years too. There are lots of subtle differences between 01 an 06 for sure.

 

1999 ISB engine changes (begins July 1998)

Diesel towing capacity has been increased
To reduce oil pressure during a cold start, excess oil from the pressure regulator is now routed to the sump instead of the lub pump inlet.
A new turbo charger wastegate mount is located on the compressor cover. As before, the wastegate dumps boost at 20 psi.
The thermostat is redesigned for increased reliability.
The fuel injection pump bracked has been strengthened for improved durability; it is now cast instead of stamped
2000 ISB engine changes (begins July 1999)

The red and silver aluminum valve cover replaced by a black and silver magnesium cover.
The wiring harness was revised to plug directly into the fuel transfer (lift) pump, which no longer has a pigtail connector.
The fuel filter is redesigned resulting in a new top loading fuel filter housing and filter element.
The low pressure fuel system added fuel inlet and outlet pressure test ports. Fuel line routing changed to accommodate the test port connections.
A 10 cm2 HY35W turbocharger replaced the HX35W turbo.
2001 ISB engine changes (begins Jan 1, 2000)

235hp / 460 ft. lb. ETC engine installed in 5-speed and automatic equipped trucks
ETC continues to use a 10cm2 HY35
245hp / 505 ft. lb. ETH engine became available with the DEE 6-speed.
ETH returns to the 12cm2 HX35W turbocharger.
ETH receives a higher output fuel injection pump.
Compression ratio is increased from 16.3 to 17.0.




2001.5 ISB engine changes (begins July, 2000)

None reported
1998-2002 ISB Engine Components Specific to Chrysler

Fuel Injection Pump – Chrysler ISB engines are equipped with the Bosch® VP44 fuel pump. The VP44 fuel pump used for Chrysler ratings has a unique fueling map to obtain higher governed speeds. The Chrysler ISB injection pump is not interchangeable with other ISB fuel pumps. The VP44 is an electronically controlled rotary distributor fuel pump and is controlled by the Cummins ECM.

Engine Mounted ECM – The Cummins ECM is mounted on the left side of the engine block below the fuel filter. The ECM controls the Bosch® VP44 fuel pump by issuing fueling commands based on engine speed, load, and accelerator position. It also monitors the sensors on the engine to be sure that it is operating properly. The ECM logs fault codes generated internally to the Cummins electronic system as well as fault codes generated by the Bosch® VP44 fuel pump.
This ECM is specific to the Dodge pickup application. It is equipped with a single 50–pin connector which allows it to connect to engine mounted sensors as well as to the trucks electronic system. For this reason, other ISB ECMs, engine harnesses, and calibrations cannot be installed on Dodge trucks.

Wiring Harness – The wiring harness has a 50–pin connector that is specific to the Dodge pickup application. It connects the engine-mounted sensors, as well as the Dodge chassis computer (JTEC), to the Cummins ECM.

Throttle Position Sensor (TPS) – The TPS assembly is engine mounted and is specific to the Chrysler ISB application. The TPS is calibrated by the manufacturer and is not field adjustable. This part is available through the Chrysler parts network.