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A core charge on diesel parts is a refundable deposit added to the purchase price of a component like a fuel injector, injection pump, or turbocharger. This deposit incentivizes the return of your old, worn part so it can enter the remanufacturing supply chain. This guide covers why suppliers charge core fees and how the buy-return-refund process works, typical core charge amounts for common diesel components, return condition requirements and refund eligibility, the relationship between core charges and the remanufacturing cycle, and where to find suppliers with fair, transparent core policies. Diesel parts suppliers add core charges because rebuildable used...

The 7.3 IDI injection pump is a Stanadyne DB2 rotary distributor pump that delivers fuel to the Navistar-built 7.3-liter indirect injection diesel V-8 found in 1988 to 1994 Ford trucks and vans. Its opposed-plunger, inlet-metering design traces back to the Roosa Master platform, using a single rotating element to feed all eight cylinders without per-cylinder pumping components. This guide covers pump identification and fuel-flow architecture, timing procedures and specifications, performance upgrades, common failure diagnosis, and removal, reinstallation, and sourcing. The Stanadyne DB2 belongs specifically to the Navistar 7.3L IDI engine family (designated A185), with distinct calibrations for naturally aspirated and...

The Holset HX35, HX40, and HE351 are three distinct turbocharger platforms designed by Holset (now Cummins Turbo Technologies) for different diesel engine sizes, power ranges, and duty cycles. This guide covers individual turbo specifications and factory applications, physical size and housing comparisons, airflow capacity and spool-up behavior, best-use applications and swap compatibility, and common part numbers for each platform. The HX35 is a fixed-geometry, wastegate-equipped turbo built for the Cummins 5.9L 12-valve and 24-valve ISB engines. Its 54–58 mm compressor wheel supports 300 to 450 horsepower and delivers fast spool-up, making it one of the most recognized Holset turbos in...

A Roosa Master injection pump is a rotary distributor-type diesel fuel injection pump that uses a single plunger to compress and distribute fuel to each engine cylinder. Originally developed by Vernon Roosa and produced by Hartford Machine Screw (later Stanadyne), this compact design replaced bulkier inline pumps and became standard equipment on nearly every diesel farm tractor built in the United States by 1961. This guide covers pump identification, internal operation, common problems, troubleshooting procedures, and parts sourcing. Proper identification starts with the dataplate stamped on the governor cover or hydraulic head housing. The model prefix (DB, DB2, DB4, or...

A Perkins injection pump is the high-pressure fuel delivery component that meters, pressurizes, and delivers diesel fuel to each cylinder at the precise moment required for combustion. It is the central component governing fuel quantity, delivery timing, and overall engine performance across every Perkins diesel series. This guide covers pump function and fuel flow, pump type identification, part number decoding and cross-referencing, diagram interpretation, timing procedures by engine series, symptom diagnosis, troubleshooting, and rebuild or replacement decisions. Perkins engines use distinct injection system designs depending on the series. The 404C-22 relies on an indirect injection prechamber with a mechanically operated...