Denso Hp3 / Hp4 Pump Plate 294183-0260

When mechanical energy from the engine's gear train rotates the supply pump's trochoid-type rotor, that rotational force is transmitted through the drive shaft and converted into hydraulic energy as fuel is drawn from the tank and pressurized for the high-pressure plunger stage. Standing at the precise boundary between the low-pressure feed gallery and the high-pressure pumping chamber, the pump plate defines the physical separation that controls internal leakage paths-the shorter and more constricted those paths remain, the higher the volumetric efficiency delivered to the SCV inlet. Any degradation in the plate's end-face flatness lengthens these leakage trajectories, allowing pressurized fuel to bypass the rotor and return to the inlet side, directly reducing the filling coefficient of the plunger cavities during each cam rotation. This relationship between a single machined component and the entire pump's hydraulic efficiency makes the Denso HP3 pump plate a replenishment SKU with predictable, recurring demand among fleet maintenance programmes, rather than an intermittent repair item.

 

Can a 0.03mm deviation in end-face flatness alter the pump's delivery curve? Yes-the feed pump relies on the plate's surface to maintain rotor axial clearance within design limits. Each 294183-0260 plate is machined to a flatness tolerance of 0.02mm across the sealing face, with the seal groove bottom diameter held to ±0.05mm of OEM specification to ensure proper O-ring compression without extrusion. The surface receives a controlled micro-finish treatment that promotes consistent seal seating while resisting the erosive effects of diesel fuel and entrained particulates. Every production batch is accompanied by a dimensional inspection report documenting flatness, groove geometry, and bore concentricity-traceable documentation that supports quality verification at receiving inspection.

 

Before ordering, confirm the pump's assembly number against the following validated list for the feed pump plate application. The 294183-0260 is confirmed for:

HP3 platform pumps: 294000-1122, 294000-1130, 294000-1150, 294000-1330, 294000-1420, 294000-1440, 294000-1450, 294000-1630, 294000-1690, 294000-1700, 294000-1990, 294000-2360, 294000-2590, 294000-2930, 294000-3000, 294000-3010, 294000-3020, 294000-3030, 294000-3120, 294000-3160 .

HP4 platform pumps: 294000-2520, 294000-2550, 294000-2710, 294000-2720, 294000-2750, 294000-2780, 294000-2790, 294000-2830, 294000-2850, 294000-2900, 294000-2910, 294000-2960, 294000-3060, 294000-3070, 294000-3090, 294000-3110, 294000-3150, 294000-3180, 294000-3190, 294000-3210 .

For engines where the pump casting number is not accessible, an online VIN-to-pump lookup tool is referenced through Denso's aftermarket portal-inputting the vehicle identification number returns the factory-fitted pump assembly, enabling positive cross-reference before purchase. OEM supersession chains have consolidated several earlier service numbers under 294183-0260, with improved material traceability applied to current production runs.

 

Having secured the pump in a holding fixture, the drive shaft's gear teeth must be inspected for alignment marks before any disassembly proceeds. Is the original gear meshing pattern still legible? Factory-applied index marks on the drive gear and driven rotor indicate the correct phasing relationship between the supply pump alignment and the camshaft position; if these marks have worn away, new reference marks should be scribed across the mating gear faces prior to separating the feed pump cover. This step ensures that when the new plate is installed and the cover reattached, the trochoid rotor timing remains unchanged-a misaligned reinstallation would produce incorrect delivery timing and erratic SCV response, negating the benefit of the new plate. All work must be conducted under ISO 4406 cleanliness Class 18/16/13 to prevent particulates from entering the pump body during the exposed interval.

 

When a worn plate is replaced during a preventive overhaul, the annualised maintenance cost per vehicle typically decreases by $120–$180 compared to running the pump until total failure requires a complete exchange. This saving arises from two mechanisms: first, the plate itself costs a fraction of the complete pump assembly; second, restoring the rotor's axial position eliminates the side-loading that accelerates drive gear wear, effectively extending the gear set service life by a factor of 1.5–2 times. For a fleet of 20 vehicles operating on a 12-month replacement cycle, the cumulative annual saving approaches $2,400–$3,600, making the common rail pump rebuild plate a cost-rational stocking item for wholesale distributors servicing commercial workshops. The plate's role in stabilising the suction-side pressure also protects the SCV from hunting behaviour, reducing the risk of downstream injector deposits that would otherwise add $80–$120 per injector to the repair bill.

 

Q1: How do I determine whether to replace only the pump plate or the pump cover as well?
Inspect the cover's sealing face for scoring, pitting, or corrosion. If the surface is visibly damaged or exhibits step wear from the original plate, replacement is recommended. If the cover face remains smooth and the dowel holes show no ovality, the existing cover can be retained. A new plate fitted to a damaged cover will not achieve the specified flatness at the assembled interface.

Q2: What are the export packaging specifications for ocean freight shipments?
Each plate is individually sealed in VCI (vapour corrosion inhibitor) anti-rust paper, then placed in a custom-moulded EPE foam insert inside a 10cm×10cm×8cm carton. Master cartons are strapped on pallets with corner protectors; a 20‑foot container holds approximately 24,000 plates. All packaging materials are compliant with ISPM-15 shipping regulations.

Q3: When mixing batches in a single wholesale order, how are batch codes managed?
Each master carton contains plates from a single production batch, with the batch code printed on both the inner pouch and the outer carton label. Separate batch codes will be dispatched in distinct cartons within the same shipment. Batch traceability is maintained through the packing list, which records each carton's batch code against the corresponding purchase order line item.

Q4: Does the 294183-0260 plate require any surface preparation before installation?
No surface grinding, lapping, or chemical treatment should be applied. The plate is supplied at final finish dimension; any post-manufacturing alteration invalidates the flatness tolerance and seal groove depth specifications. Installation requires only cleaning of the mating housing face with a lint-free cloth and approved solvent to remove residual oil or old gasket material.

Q5: Under what circumstances does the return policy apply?
Return authorisation is granted for unopened, original packaging within 30 days of delivery, provided the batch code seal remains intact. Claims for dimensional non-conformance must be accompanied by the receiving inspection report and the original batch documentation; returns are not accepted for plates that have been installed or show evidence of torqueing.

 

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