CYEFI CB6P810W – Professional Diesel Pump Reconditioning Kit

The CYEFI CB6P810W service kit delivers a component-level solution for restoring Bosch CP3.3 radial-piston high-pressure pumps, specifically targeting OE references 0445020150 and 0445020122. For workshops across Africa and Southeast Asia servicing commercial diesel engines-including Yuchai 4E/6J/6A/6G, Cummins ISBe/ISDe, BMW M57/M67, and Mercedes OM642 platforms-this kit addresses pressure amplitude imbalance, a condition where uneven plunger wear creates a 12% peak pressure disparity and a 2.4 bar rail ripple. The result is the characteristic 1,600 rpm "growl" that signals impending pump failure. Rather than replacing the entire pump assembly, the CYEFI CB6P810W enables a precision overhaul that restores performance with genuine-spec components.

The CYEFI kit contains seven mission-critical elements engineered specifically for the CP3.3 architecture. A peak-equalization valve bleeds excess pressure from the over-performing plunger, normalizing peaks to within ±1.5% tolerance. The included CBN grinding stone (120-grit, single-use) resurfaces cam lobes in-situ, removing 0.02mm of material to restore surface finish from 0.6μm Ra to 0.25μm Ra-reducing rolling resistance from 2.8 Nm to 1.2 Nm. Detuned return springs with asymmetric coil pitch (3.2mm/4.4mm) eliminate plunger flutter at 2,400 rpm by shifting natural frequency from 240 Hz to 380 Hz. A low-hysteresis pressure control valve with lapped spool (Ra 0.03μm finish) stabilizes rail pressure to within ±2 bar. The CYEFI seal kit includes high-temperature Viton O-rings and correctly sized shaft seals (31.35mm and 32.44mm)-critical dimensions often incorrect in universal kits.

Successful CP3.3 reconditioning using the CYEFI CB6P810W requires methodical procedures. Begin by disconnecting battery terminals and removing ECU data connectors to prevent voltage spikes. The pump must be handled exclusively by its main housing-never by the high-pressure connection ports. During CBN grinding, use the vacuum port attachment to extract debris, and block all inlet/outlet ports. When positioning the detuned springs, the blue marking faces the plunger, red marking toward the retainer. For early 0445020122 pumps with M12 regulator threads, use the included adapter; for later M14 versions, omit it. Prime the pump with 60ml clean diesel before rotational testing to prevent dry-running damage. The shaft seals face opposite directions-careful hammering with a large socket ensures proper seating. The CYEFI kit includes detailed torque specifications for all fasteners.

Component	Specification / Function
Peak-Equalization Valve	Spring-loaded spool valve, ±1.5% pressure peak normalization
CBN Grinding Stone	120-grit, single-use, removes 0.02mm, restores 0.25μm Ra finish
Detuned Return Springs	Asymmetric 3.2mm/4.4mm pitch, eliminates 240 Hz resonant flutter
Low-Hysteresis PCV	Lapped spool Ra 0.03μm, reduces hysteresis from 2.8 bar to 0.4 bar
Shaft Seals (2 pcs)	31.35mm & 32.44mm-correct sizing for CP3.3 variants
Viton Seal Set	High-temperature O-rings, sensor/port copper washers
Flow Coating Kit	Epoxy coating, reduces inlet port roughness Ra 0.8μm→0.15μm

For repair shops and parts distributors in developing markets, the CYEFI CB6P810W offers a consolidated approach to CP3.3 pump reconditioning. This single kit eliminates the need to source multiple individual components (regulator valves, return springs, seal sets, grinding tools) from separate suppliers-reducing procurement complexity and inventory overhead. Early intervention-reconditioning before cam lobe pitting progresses-prevents catastrophic fuel system contamination that would necessitate flushing the entire rail and replacing all injectors, saving substantial additional labor and component costs. The CYEFI kit supports diverse commercial vehicle fleets common across Africa and Southeast Asia, including Tata and Dongfeng applications. For distributors, stocking the CB6P810W provides a complete, ready-to-use solution that minimizes workshop downtime and technician error from mixing mismatched parts.

Q1: How do I identify whether my pump is 0445020150 or 0445020122?
A: Check the data plate on the pump body. 0445020150 uses an M14 regulator thread; 0445020122 uses M12. The CYEFI CB6P810W includes an adapter for M12-use it only on the earlier pump variant.

Q2: Can the CBN grinding stone be reused across multiple pump overhauls?
A: No. The stone is single-use, engineered to remove exactly 0.02mm of lobe material. Reuse results in under-grinding and will not restore the 0.25μm Ra surface finish required for proper operation.

Q3: What are the risks of using a universal CP3 kit instead of the CYEFI solution?
A: Universal kits often contain incorrect shaft seal sizes-critical 31.35mm vs. 32.44mm dimensions. They lack the peak-equalization valve and CBN stone, so pressure imbalance and cam lobe wear remain unaddressed. The pump will fail again within months.

Q4: What is the expected service life after a CB6P810W rebuild?
A: With clean fuel and regular filter changes (every 20,000–30,000 km), a properly rebuilt pump exceeds 300,000 km, matching OEM new pump longevity.

Q5: Does the kit include the copper washer for the fuel temperature sensor?
A: The kit includes a full O-ring set; the temperature sensor copper washer is generally reusable if undamaged. If replacement is needed, it is readily available from standard hardware assortments.

Q6: What is the typical workshop time for a complete CP3.3 rebuild using this kit?
A: For an experienced technician, 3–4 hours; count a full day if including paint stripping and repainting of the pump housing.

 

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