The 303-1112 / ZTSE4666 / ZTSE6765 IPR Socket is a specialized service tool used for removing and installing the Injector Pressure Regulator (IPR) valve on diesel engines equipped with high-pressure oil fuel systems.
The IPR valve is typically located in a tight, recessed area of the high-pressure oil pump (HPOP), making access difficult with standard sockets. This tool is designed with:
- Deep, narrow profile for confined access
- Relief/slotted design to clear the electrical connector
- Full engagement on the IPR hex without damaging components
It is commonly required because the IPR sits in a position where:
- Standard sockets cannot reach
- Applying torque incorrectly can damage the electrical connector
- Improper tools can round the hex or crack the valve housing
Ford / Navistar Applications
- 6.0L Power Stroke (Ford Super Duty, E-Series, etc.)
- VT365 / MaxxForce 7
- VT275
Navistar Medium-Duty Engines
- DT466 / DT570 / HT570
- MaxxForce DT / 9 / 10
👉 These engines all use HEUI-style high-pressure oil systems, where the IPR valve controls injection pressure.
Key Features & Benefits
- Designed for IPR valve removal and installation
- Cross-references: 303-1112, ZTSE4666, ZTSE6765
- Deep socket design for hard-to-reach locations
- Clearance for electrical connector to prevent damage
- Ensures proper torque application
- Prevents rounding or breaking the IPR valve
- Essential for HEUI fuel system service
Typical Applications
- IPR valve removal and replacement
- High-pressure oil system service
- Injector system diagnostics
- Engine rebuild and repair
- Ford Power Stroke & Navistar diesel service
Why It Matters
The IPR valve is a critical control component in HEUI systems. Improper removal can cause:
- Broken electrical connectors
- Damaged valve body
- Incorrect torque during install
Using the correct socket ensures:
- Safe removal in tight spaces
- Proper installation without damage
- Reliable fuel system performance