294183-0140 Pump Plate – Denso Hp3 / Hp4 Feed Pump Interface Restoration

Mounted longitudinally on the engine block adjacent to the flywheel housing, the DENSO HP3/HP4 supply pump receives direct vibration inputs from the crankshaft at a 1:1 drive ratio, typically in the 20–100 Hz range depending on engine speed. Radiant heat from the exhaust manifold and turbocharger raises the pump body surface temperature to 90–110°C, while the rigid fuel inlet and outlet pipes impose bending moments on the pump casing through their fixed routing. These external loads-vibratory acceleration, thermal gradients, and pipe-induced torque-converge on the pump body casting, then transmit through the bolted interface to the pump plate. The plate, positioned as the load-bearing separator between the trochoid feed pump rotor set and the high-pressure plunger barrel assembly, absorbs and redistributes these stresses across its planar contact faces. For wholesale buyers serving line-haul fleets and construction contractors, a pump plate lacking adequate structural integrity translates directly into premature supply pump failure. In high-duty applications where a single truck accumulates 150,000 km annually, a failed pump plate can trigger a cascading breakdown-SCV instability, plunger scoring, and camshaft bearing wear-adding unplanned downtime costs of $800–$1,200 per vehicle per event, a risk factor that materially impacts the end-customer's operating cost model.

The 294183-0140 plate is forged from a medium-carbon alloy steel with a minimum ultimate tensile strength of 850 MPa, a specification verified through batch tensile tests performed on three coupons per production lot, with test reports available upon request. The thermal expansion coefficient (11.7 × 10⁻⁶ /°C) is matched to the pump body's aluminium alloy (23.0 × 10⁻⁶ /°C) such that the differential expansion across the 80–110°C operating range produces less than 0.015 mm of relative movement at the sealing interface-a calculated value that preserves the rotor end-float tolerance. Positional tolerance for the two locating pin holes is held to φ0.02mm true position relative to the plate centre, ensuring that the feed pump rotor shaft aligns with the drive cam centreline within 0.03mm. Without this bore concentricity, the trochoid rotor set binds against the pump cover, increasing drive torque by an estimated 15–20% and accelerating wear on the cam ring bearing surfaces.

The plate fits HP3 pumps with pump numbers 294000-0237, -0334, -0356, -0440, -0532, -0544, -0640, -0782, -0890, -0900, -0910, -1210, -1240, -1370, -1400, -1510, -1520, -2330, and -2350. For HP4 platforms, the same plate is applicable where the feed pump housing casting shares the 2941xx-xxx0 prefix; however, verification must be made by checking the casting number on the pump body's feed pump cover (typically six digits stamped adjacent to the SCV mounting boss). A cross-reference database covering 47 pump variants is accessible via the QR code printed on each product carton, providing immediate confirmation of compatibility against the pump's steel identification tag.

Between the pump plate and the pump body, a single elastomeric O-ring (size 58.0 × 2.5 mm, NBR 70 durometer) provides the primary seal. The O-ring must be coated with a thin, even film of clean diesel fuel-not grease, not sealant-to allow it to settle into the groove without twisting during compression. The plate's sealing face receives no additional compound; any paste or liquid gasket alters the compression height and changes the rotor end-float by as much as 0.08 mm, directly affecting suction stroke volume. Six M6×25 flange bolts are installed in a diagonal sequence, tightened to 6.9–10.8 N·m (0.7–1.1 kgf·m), with each pass of the sequence increasing torque incrementally.

The feed pump drive gear, pressed onto the pump shaft, meshes with the engine's idler gear. When the pump plate's surface flatness degrades beyond 0.03 mm, the resultant axial movement of the feed pump rotor transmits a reciprocating thrust load back through the shaft, causing micro-pitting on the gear tooth flanks-a failure mode that typically appears after 150,000–200,000 km of operation. Replacing the 294183-0140 during a scheduled injector service (recommended at 400,000 km intervals on highway applications) eliminates this thrust fluctuation. For a fleet of 50 trucks, the annual consumption forecast is 12–18 plates based on staggered maintenance cycles, representing a component cost of $360–$720 versus the alternative of replacing two to three entire supply pumps annually at $2,500–$3,600 per unit.

Q1: What is the price tier structure and lead time for a bulk order of 100–500 units?
Orders up to 50 units ship within 3–5 business days; 51–200 units require 7–10 days; 201–500 units are produced to order with a 15–20 day lead time. Price per unit scales down from the single-piece retail price by 12% for 50+, 18% for 200+, and 25% for 500+.

Q2: Where is the material traceability mark located, and how does it link to the heat treatment record?
A laser-engraved 10-character alphanumeric code on the non-mating face (the back side opposite the sealing face) identifies the forging batch, heat treatment furnace run, and final lapping date. This code permits retrieval of the complete manufacturing record, including the vacuum-hardening temperature profile and soak duration.

Q3: What are the storage temperature and humidity limits that affect the product's service life?
The plate must be stored at 5–40°C with relative humidity below 70%. Exceeding 45°C accelerates the volatilisation of the vapour-phase corrosion inhibitor, reducing the effective rust protection from 24 months to approximately 12 months. Condensation from high humidity (>80% RH) can initiate micro-pitting on the lapped face within 30 days.

Q4: If a plate fails during the warranty period, what is the testing procedure and what criteria determine acceptance of a claim?
A returned plate is measured for flatness, surface roughness, and hardness. A claim is accepted if (a) flatness exceeds 0.03 mm, (b) surface hardness falls below HRC 42, or (c) visible corrosion pitting deeper than 0.02 mm appears. Claims are rejected if installation marks show diagonal torque sequence deviations or if foreign particle abrasion is evident.

Q5: What is the marine insurance coverage for shipments to European ports?
All shipments are covered under ICC (A) clauses for total loss, with an additional 10% uplift for commercial value. Partial damage due to handling is covered only if noted on the delivery receipt at the time of unloading; the consignee must inspect within 72 hours of receipt to file a claim.

Q6: Does a technical data package-including the 2D engineering drawing-accompany each shipment?
A data sheet with critical dimensions (overall thickness, bore diameters, hole centre distances) is included in every carton. Full 2D mechanical drawings in PDF format are available upon request for large orders, but are not shipped as standard documents.

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