The LDFI0504 Plunger & Barrel Group from SRT Automotive (formerly Lucas Diesel Systems) is a new aftermarket replacement component designed for compatible Ford® 7.3L Power Stroke and Navistar® T444E HEUI diesel fuel injectors with AA injector body codes.
The precision-fitted plunger and barrel are essential components of the HEUI injection system. During injector operation, the plunger pressurizes diesel fuel within the barrel, supporting the high-pressure fuel delivery required for injection.
Designed for professional diesel fuel-injection rebuilding and repair, the LDFI0504 provides a replacement plunger and barrel group for compatible AA-code injectors used in selected Ford Power Stroke and Navistar T444E applications.
Important: This listing is for one plunger and barrel group, not a complete fuel injector. This component is intended for AA injector configurations. Verify the original injector identification code and plunger-and-barrel reference before ordering.
Features & Benefits
- New aftermarket HEUI plunger and barrel group
- Designed for Ford® 7.3L Power Stroke and Navistar® T444E AA-code injectors
- 6.0 mm nominal plunger diameter
- Standard-type plunger and barrel configuration
- Supports high-pressure fuel generation within the compatible injector
- Suitable for professional injector rebuilding, repair, and remanufacturing
- Supplied in Lucas / SRT Automotive packaging
Product Specifications
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California Diesel SKU: LDFI0504
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SRT Automotive Reference: SRDI0504
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Former Lucas Reference: LDFI0504
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Technical Reference: 06000/31
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Product Type: Diesel Fuel Injector Plunger & Barrel Group
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Also Known As: HEUI Plunger and Barrel, Injector Plunger Assembly, Plunger & Barrel Set
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Fuel Type: Diesel
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Injection System: HEUI – Hydraulically Actuated Electronic Unit Injection
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Injector Body Code: AA
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Plunger Diameter: 6.0 mm
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Configuration: Standard
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Condition: New / Aftermarket
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Product Tier: Aftermarket
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Warranty: 12 Months / 50,000 Miles
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Packaging: Lucas / SRT Automotive Packaging
This product has not been installed or placed into service. Due to bulk handling, storage, inspection, or repackaging, minor cosmetic marks, light scuffs, or small surface imperfections may be present. These cosmetic variations are acceptable only when they do not affect fit, critical mating surfaces, or intended functionality.
Compatible Engine Families
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Ford® 7.3L Power Stroke: Selected 1994–1998 HEUI applications equipped with AA-code injectors
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Navistar® / International® T444E: Selected applications equipped with AA-code HEUI injectors
Applications vary according to engine serial number, production year, injector configuration, and calibration. Engine displacement or vehicle model alone does not establish compatibility.
Compatible Injector References
Ford® 7.3L Power Stroke — AA Injector Family
- F81Z-9E527-DRM
- F4TZ-9VE527-AARM
- F7TZ-9E527-ARM
Navistar® T444E — AA Injector Family
- 1822800C95
- 1816187C3
- 1822801C98 / 1822801C99
- 1821836C3
Fitment Verification: These injector numbers are provided as application references for the AA-code injector family. Confirm the original injector body code and plunger-and-barrel configuration before installing replacement components.
Cross Reference Information
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LDFI0504: Lucas Diesel Systems reference
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SRDI0504: SRT Automotive reference
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06000/31: Technical component reference
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DPE06000/31: DIPACO aftermarket reference for the corresponding AA plunger-and-barrel application
Important: Reference numbers identify corresponding replacement applications and do not establish identical manufacturing specifications.
Other plunger-and-barrel configurations, including 06060/31 and 06061/31, are intended for different injector families and should not be substituted without technical verification.
Professional Installation
HEUI plunger and barrel assemblies operate under high fuel pressures and require precise component fit and proper assembly procedures.
Installation should be performed by a qualified diesel fuel-injection technician using suitable tooling, proper cleanliness procedures, and the manufacturer's applicable service specifications.
Professional injector calibration and test-bench verification are recommended following installation to confirm fuel delivery, leakage, and correct injector operation.
Warranty
This aftermarket product is backed by a 12-month / 50,000-mile limited warranty, subject to California Diesel warranty terms and proper professional installation.
Packaging
Supplied in Lucas / SRT Automotive packaging. Packaging appearance may vary between previous Lucas Diesel Systems branding and current SRT Automotive branding.
California Diesel Note
California Diesel supplies replacement diesel, automotive and heavy-equipment components for repair facilities, fleets and professional service applications.
For compatibility assistance, contact sales@california-diesel.com or call +1 (951) 234-1022.
Legal Compliance
Ford®, Power Stroke®, Navistar®, International®, and other third-party brand names, part numbers, and trademarks are used solely for product identification and compatibility information. They remain the property of their respective owners.
Such references do not imply that this aftermarket replacement component is manufactured, authorized, or endorsed by those vehicle or engine manufacturers.
California Proposition 65
WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov.
