CP4 Camshaft 5088 High-Pressure Fuel Pump | Bosch Replacement Part

The CP4 Camshaft 5088 is a precision-machined rotating component engineered to restore pressurization integrity in Bosch-generation common rail fuel systems. Designed as a service-grade alternative to OE shaft assemblies, this unit directly addresses lobe degradation and roller bearing fatigue-two dominant failure modes in CP4.1 and CP4.2 pump architectures. Workshops dealing with intermittent start complaints, prolonged crank cycles, or rail pressure undershoot during load transitions will find this camshaft a viable, cost-conscious remedy that avoids complete pump head replacement.

Manufactured from case-hardened chromium-molybdenum steel, the CP4 camshaft 5088 undergoes induction tempering to achieve a surface hardness of 58–62 HRC across its three drive lobes. Each lobe profile is CNC-ground to within ±0.002 mm of Bosch's original blueprint, ensuring precise plunger lift timing and consistent volumetric delivery per pump revolution. The bearing journals are micro-polished to an Ra finish of 0.2 µm, reducing friction against the pump housing bushings during high-speed rotation. Unlike aftermarket blanks that skip post-grinding stress relief, this 5088 camshaft receives a cryogenic treatment cycle to stabilize molecular structure, minimizing distortion under thermal cycling from –20°C to 120°C. The drive gear interface uses a spline-fit configuration with a central M12 bolt hole, matching factory torque specifications of 80 Nm + 90° angle-tighten. Weight is held at 1.42 kg, balancing rotational inertia against quick throttle response in electronic-controlled pump heads.

This CP4 pump camshaft fits all Bosch CP4S1, CP4S2, and CP4.2 variants used in 3.0L V6 TDI (VW/Audi/Porsche), 4.4L V8 Diesel (BMW N57), and 3.6L V6 Power Stroke (Ford F-150) applications. It also supports the Cummins ISB 6.7L and Mercedes OM642 platforms where CP4 pumps were factory-fitted between 2011–2019. For repair shops, cross-referencing the pump serial number (stamped on the housing flange) against our application chart eliminates return delays. This shaft is not backward-compatible with CP3 or Denso HP4 systems; do not substitute for pre-2010 CP1 eccentric-drive assemblies. The 5088 part number supersedes earlier revision A/B shafts, incorporating a wider oil relief groove at the rear journal to improve splash lubrication to the tappet rollers-a known weak point in earlier runs.

Installing the 5088 camshaft demands a contamination-conscious workflow. Drain the fuel gallery and replace the ZME regulator screen if clogged. During extraction, mark the drive gear position relative to the pump shaft to preserve injection timing; failure to index results in a P0087 or P0191 code post-startup. Pre-soak the new shaft in low-sulfur diesel blended with 2% biodiesel for ten minutes-this mimics the operating lubricity of B20 fuel and prevents dry-scuffing during the first 30 revolutions. Torque the central bolt in three increments (40 → 60 → 80 Nm) with a 90° final turn using a stretch-angle gauge. After assembly, run a low-pressure purge cycle via diagnostic tool to expel air from the high-pressure head before cranking. Always log the new shaft's serial number for future warranty traceability.

Investing in a camshaft-only replacement rather than a full pump cartridge yields 40–55% cost savings for the workshop while delivering identical pressure output-provided the plungers and hydraulic head remain within wear limits. This approach also reduces parts waste and aligns with growing demand for sustainable, repair-over-replace service models. Moreover, the CP4 camshaft 5088 allows independent shops to compete with dealership pricing on popular SUV and light-truck fuel system overhauls, particularly for vehicles outside factory warranty. We back every unit with a 12-month unlimited-mileage defect warranty covering lobe delamination and fracture-conditions often excluded by generic import suppliers.

Q1: Does the 5088 camshaft require a matching tappet roller replacement, or can existing rollers be reused?
A: We strongly recommend pairing with new roller tappets. Even minor flat-spotting on old rollers will transfer uneven load to fresh lobes, potentially halving service life. Our kit option includes matched tappets for optimal load distribution.

Q2: How do I distinguish a genuine 5088 from clone shafts that fail within 5,000 miles?
A: Genuine units carry a laser-etched batch code on the rear face and a distinct brownish oxide coating on non-machined areas-clones lack both and often show grinding burn marks near the lobe base.

Q3: Will fitting this camshaft resolve persistent P0087 low-rail-pressure faults without changing the fuel metering valve?
A: Only if the valve's internal screen is debris-free. If you find metal particles in the return line, replace the metering unit simultaneously to avoid recurring pressure drop complaints.

Q4: Can this shaft handle biodiesel blends above B20 without accelerated corrosion?
A: Yes, the chromium-molybdenum base resists acidic byproducts from higher bio content, but we advise a fuel water-separator service every 10,000 miles to prevent emulsified water attack on the hardened surface.

Q5: What torque wrench extension factor applies when tightening through the pump housing access hole?
A: Use a crowfoot adapter; set the wrench to 76 Nm to compensate for the 15 mm offset-this delivers the effective 80 Nm required at the bolt head.

To make your purchasing experience smooth and easy, we offer a variety of secure payment options:

Bank Transfer

Supports multiple currenciesand bank payment methods.

Western Union

Quick and global money transfers.

PayPal

Safe and convenient online payment.

Alibaba

Enjoy extra protection with trusted Alibaba transactions.

We're here to make your order process worry-free - choose the payment method that works best for you!

Hot Tags: cp4 camshaft 5088 high-pressure fuel pump | bosch replacement part, China cp4 camshaft 5088 high-pressure fuel pump | bosch replacement part manufacturers, suppliers, factory