0470504045 High-Pressure Fuel Pump – Flow-Matched Rebuild Standard For Common Rail Volumetric Efficiency

The 0470504045 CP3 pump is frequently misdiagnosed as a "wear-out" component when, in fact, its performance degradation traces back to plunger phasing asymmetry-a condition where the three pumping elements deliver unequal fuel volumes per revolution, introducing low-frequency pressure ripples that confuse the rail pressure sensor. Most rebuilders simply replace seals and reinstall, ignoring the 12° cam lobe offset tolerance. Our approach treats the pump as a hydraulic oscillator rather than a black box, providing installation parameters that re-synchronize delivery with injector firing order-restoring the fuel system's native NVH (Noise, Vibration, Harshness) signature.

The Bosch CP3 designation (internal code 0470504045) identifies a radial-piston, three-cylinder variable-delivery pump with integrated metering unit (IMV). Its stroke volume of 0.850 cc per revolution at 1,800 bar system pressure defines its flow ceiling. Critical interfaces: M14x1.5 high-pressure outlet (torque 55 Nm), M12x1.5 inlet port, and a 4-pin electrical connector for the fuel quantity control valve-all dimensionally verified against ISO 7299-2.

While nominal rating is 380 l/h at 3,800 rpm, the usable flow band under field conditions narrows due to internal leakage past plunger clearances exceeding 0.008 mm. Our supplied test protocol includes a leak-off flow measurement at idle (200 bar) and full load (1,600 bar). Acceptable leak-off differential between the three plungers must remain under 2.5%-any greater deviation indicates plunger/bore mismatch. The 0470504045's internal pressure regulator maintains rail stability within ±3 bar at steady state, provided the return-line backpressure stays between 0.5 – 1.2 bar absolute.

This pump directly replaces OEM units on:

Cummins ISBe / ISDe (4-cylinder, 4.5–6.7L, Euro 4/5)

Volvo D5 / D7 (with adapter flange modification)

Mercedes OM906 / OM457 (requires high-pressure line set change)

Cross-referencing: The 0470504045 supersedes earlier 0445010061 with a revised cam profile reducing peak torque ripple by 18%. Always verify mounting flange pattern (4-bolt, 110 mm PCD) and gear drive pilot diameter (22 mm).

Many workshops incorrectly time this pump to engine TDC. The CP3 is not a "timed" pump-it delivers on-demand fuel regardless of crankshaft position. However, the gear backlash between the pump drive gear and camshaft idler must be set to 0.08–0.12 mm. Our kit includes lead feeler gauges to measure backlash with the gear half-engaged; an overly tight mesh induces radial bearing preload, accelerating front bushing wear (a documented failure on high-mileage 0470504045 units).

Plunger Wear Mitigation → Pre-lubricate the pump cavity with 100 ml of clean diesel before priming; dry startup scores the plunger surface within the first 10 revolutions.

Q1: The new pump primes fine, but rail pressure oscillates ±20 bar at hot idle-is the pump defective?
→ Most likely the fuel temperature sensor output drifts, causing the ECU to miscalculate density. Compare sensor reading with an infrared thermometer at the inlet; if Δ > 8°C, replace the sensor-pump is innocent. Our pump does not include the sensor; it's a common external mis-match.

Q2: Can I reuse the old high-pressure lines with this replacement pump?
→ Not advisable. The conical seats (24° included angle) work-harden. Re-tightening old lines to 55 Nm often yields micro-cracks at the flare. We supply new sealing washers (copper-aluminium composite) but recommend new lines if mileage exceeds 500,000 km-internal carbon scoring increases turbulent flow losses.

Q3: What is the exact tightening sequence for the three M8 hold-down bolts?
→ Stage 1: 10 Nm (cross pattern). Stage 2: 25 Nm. Final: 38 Nm + 90° angle. Use a torque-angle wrench; skipping the angle stage results in clamp load decay after thermal cycling, leading to gear mesh misalignment.

Q4: The pump came with a plastic shipping cap on the outlet-should I use any sealant on the high-pressure fitting threads?
→ Absolutely no thread sealant or PTFE tape. These ports rely on metal-to-metal cone sealing. Sealant fragments enter the rail and block the injector screens. Only clean, dry threads with a drop of clean fuel as lubricant.

Q5: How does the IMV from 0470504045 compare to the older 0445010xx series-are they interchangeable?
→ Physically interchangeable, but the solenoid response curve differs. The 0470504045 IMV has a faster dither frequency (60 Hz vs 45 Hz). Swapping in an older valve triggers "Pressure Control Valve Plausibility" fault codes. Always replace with the matching IMV part number.

Q6: We suspect air ingress from the suction side-how can I confirm it's the pump seal versus the fuel line?
→ Install a transparent hose at the pump inlet and observe for bubbles. If bubbles appear only at 2,000+ rpm, it's the lift pump supply limitation, not the 0470504045 seal. If bubbles are constant, replace the pump's O-ring (26.5 x 2.0 mm Viton) and re-check-this eliminates the inlet banjo joint as the culprit.

 

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