Metering Unit
Дозирующее устройство
Unidad de medición
The genuine Shacman X5000 Metering Unit with OEM number 1001366035 is a precision electromagnetic flow control valve that regulates the amount of fuel entering the high-pressure injection pump on WP13, WP15, and ISM common rail engines. This metering unit (also known as the fuel metering valve or inlet metering valve) is commanded directly by the engine control unit (ECU) to deliver the exact fuel volume required for current operating conditions, ensuring stable rail pressure and precise injection timing. Manufactured to exact Shacman specifications, 1001366035 features a hardened stainless steel spool, high-response solenoid, and fine mesh filtration to protect internal clearances. Its linear flow characteristic enables smooth, accurate fuel metering across the entire engine operating range. Every dimension matches the original pump housing, guaranteeing direct replacement on X5000 trucks.
A faulty metering unit causes erratic rail pressure, hard starting, surging, black smoke, and reduced power. Installing OEM 1001366035 restores precise fuel control, protecting the high-pressure pump and injectors from damage. This component is essential for any fuel system repair or when diagnostic trouble codes (P0087, P0090, P0251) indicate metering valve problems.
Each 1001366035 metering unit is tested for coil resistance, response time, flow linearity, and leakage. Choose genuine Shacman quality for reliable fuel metering and peak engine performance.
| Parameter | Specification |
|---|---|
| OEM Part Number | 1001366035 |
| Product Name | Metering Unit / Fuel Metering Valve (IMV / ZME) |
| Brand | Shacman (Genuine OEM) |
| Application | Shacman X5000 – WP13, WP15, ISM common rail high-pressure pumps |
| Type | Normally open, solenoid-actuated, spool valve |
| Coil Resistance | 3.5 Ω ± 0.5 Ω @ 20°C |
| Operating Voltage | 12 V DC (PWM controlled) |
| Max Current | 2.5 A |
| Flow Range (linear) | 0 – 220 l/h at 100% duty cycle |
| Inlet Fuel Pressure | 0.5 – 6.0 bar (lift pump supply) |
| Max System Pressure (outlet) | 2,500 bar (downstream of pump) |
| Response Time (open to close) | ≤ 5 ms |
| Internal Filter | Stainless steel mesh, 50 µm |
| Temperature Range | -40°C to +120°C (fuel temperature) |
| Weight (approx.) | 0.28 kg |
| Standards | ISO 9001, Shacman Q/SC 723, Bosch specification |
The Shacman metering unit 1001366035 is a proportional solenoid valve that controls the inlet fuel flow to the high-pressure pump’s pumping elements. When the ECU applies a pulse-width modulated (PWM) signal to the solenoid, the armature moves, opening the spool valve proportionally to the current. A higher duty cycle opens the valve wider, allowing more fuel to reach the pump, which in turn increases rail pressure. The valve is normally open (fail-safe), meaning that if electrical power is lost, the pump will receive maximum fuel and the engine will default to a reduced power mode, preventing damage from over-pressure.
The spool and sleeve are manufactured from hardened stainless steel with lapped clearances measured in microns. This precision fit ensures minimal internal leakage and consistent flow characteristics over the valve’s lifetime. The solenoid coil is encapsulated in a high-temperature polymer to resist fuel and vibration. The built-in 50-micron stainless steel strainer protects the precision internal clearances from any debris that may pass through the primary fuel filters. The valve is sealed with O-rings compatible with diesel fuel and biodiesel blends.
Each 1001366035 metering unit is tested for coil resistance, insulation resistance, and leakage current. The valve is then mounted on a flow bench and cycled through its entire operating range while measuring flow vs. duty cycle. Linearity is verified to be within ±2% of nominal. Random samples are subjected to 10 million operational cycles and thermal shock (-40°C to 120°C) to validate durability. These rigorous tests guarantee that the metering unit provides accurate, repeatable fuel control for over 800,000 km.
The 1001366035 metering unit’s spool design provides a near-linear relationship between PWM duty cycle and fuel flow. This allows the ECU to precisely calculate the required current for any desired rail pressure without complex compensation tables. The fast response time (≤5 ms) enables the ECU to correct pressure fluctuations instantly during transient conditions such as sudden acceleration or deceleration.
The metering unit is the primary actuator for rail pressure control in a common rail fuel system. The ECU compares the actual rail pressure (from the pressure sensor) to the demanded pressure and adjusts the metering unit current to increase or decrease the fuel flow to the high-pressure pump. A faulty metering unit can cause rail pressure to be too low (causing lack of power, misfire) or too high (causing injector damage, rough running, or even fuel system rupture). The 1001366035’s precise linearity and fast response allow the ECU to maintain rail pressure within ±20 bar of the target, ensuring consistent injection timing and quantity.
Common rail pumps require a constant supply of clean fuel at the correct inlet pressure. The metering unit’s internal strainer catches any debris that could damage the spool or cause sticking. If the strainer becomes clogged, flow is reduced, and rail pressure drops, triggering a P0087 code. The genuine Shacman metering unit includes a high-flow strainer that is less prone to clogging than aftermarket units. Fleet data shows that replacing a metering unit with OEM 1001366035 resolves 90% of rail pressure fault codes related to fuel flow.
In engines with multiple injections per cycle (pilot, main, post), precise metering is essential to avoid pressure waves that could cause secondary injection errors. The 1001366035 valve’s low hysteresis ensures that the same current always yields the same flow, regardless of whether the valve is opening or closing. This repeatability allows the ECU to achieve stable rail pressure even during high-frequency injection events.
Incorrect metering can cause the high-pressure pump to work against a closed outlet, generating excessive heat and wear. The 1001366035’s fail-safe normally open design ensures that if the solenoid fails, the pump receives full flow, which is less damaging than a stuck-closed condition (which would starve the pump of fuel). This safety feature protects the entire fuel system from catastrophic failure.
Replacing a faulty metering unit with OEM 1001366035 requires care to avoid contamination. Disconnect the battery, remove the electrical connector, and clean the area around the valve on the high-pressure pump. Unscrew the valve using a suitable socket (typically 27mm deep). Remove the old O-rings and inspect the bore for scratches. Lubricate the new O-rings with clean diesel fuel, install them on the new valve, and thread the valve into the pump by hand until seated. Torque to 40-50 Nm. Reconnect the electrical connector. Prime the fuel system and start the engine. Use a diagnostic tool to monitor rail pressure versus desired; both should match.
This metering unit is compatible with all Shacman X5000 models equipped with WP13, WP15, or ISM engines from 2015 onward. It directly replaces original part numbers 1001366034 and 1001366036. Applications include Bosch CP4.2, CP3, and other common rail pumps found on Shacman trucks. Always verify the OEM marking 1001366035 before installation. Do not attempt to clean or rebuild a failed metering unit; internal clearances are not serviceable.
When replacing the metering unit, also replace the fuel filters and inspect the fuel for water or debris. Contaminated fuel is the leading cause of metering unit failure. Keep a spare 1001366035 in your parts inventory for rapid roadside repairs. After installation, clear any related fault codes and perform a rail pressure learn procedure if required by the ECU.
Monitor the metering unit’s duty cycle with a scan tool. At idle, a healthy unit should operate at 20-30% duty cycle. If it exceeds 80% at full load, there may be internal wear or a fuel supply restriction. Also measure coil resistance (should be 3-5 ohms). Replace the metering unit every 500,000 km as preventive maintenance on severe-duty trucks.
Shacman X5000 trucks operate in mining, construction, oilfields, and long-haul freight – environments where the metering unit is exposed to fuel temperature extremes, vibration, and electrical noise. The 1001366035 is tested to withstand 20 G vibration and 500 hours of salt spray. The solenoid coil is sealed against fuel and moisture ingress (IP6K9K).
In mining dump trucks, the metering unit operates continuously in high-vibration conditions. The stainless steel spool and hardened sleeve resist wear from fuel impurities. In arctic conditions, the solenoid’s magnetic properties remain stable down to -40°C, and the spool’s clearance accommodates higher fuel viscosity. The internal heater (not present on this unit) is not required because the valve’s PWM signal naturally warms the coil.
For highway fleets, the metering unit endures millions of on/off cycles as the ECU adjusts rail pressure. Its fatigue life exceeds 50 million cycles, making it a long-lasting component. The 50-micron strainer effectively traps particles without restricting flow, even when using biodiesel blends up to B20.
1. Precision linearity: Flow vs. duty cycle calibrated to ±2% for accurate ECU control. 2. Superior materials: Hardened stainless steel spool and sleeve resist wear. 3. Fast response: ≤5 ms enables stable rail pressure during transients. 4. Integrated filtration: 50-µm stainless steel strainer protects internal clearances. 5. Full traceability: Serial-numbered with test report and batch traceability.
Aftermarket metering units often have non-linear flow curves, causing rail pressure oscillations and drivability issues. Many also lack the internal strainer or use inferior coil wire that fails from heat. The genuine Shacman unit’s precise calibration and robust construction ensure reliable fuel control for the life of the engine. Investing in 1001366035 prevents rail pressure faults, injector damage, and engine de-rates.
For fleet maintenance, standardizing on genuine Shacman metering units simplifies diagnostics because the flow characteristics match the ECU’s software. The cost of one fuel system repair due to an aftermarket valve far exceeds the price of OEM.
A metering unit that fails closed can starve the pump, causing expensive pump and injector replacement. The 1001366035’s fail-safe normally open design prevents this catastrophe. Its consistent flow accuracy also improves fuel economy by 2-3% by maintaining optimal rail pressure.
Shacman’s metering unit 1001366035 is produced in an IATF 16949 certified facility under clean-room conditions. The solenoid coil is wound on automated machines with 100% insulation testing. The spool and sleeve are machined from hardened stainless steel bar stock and lapped to final clearance. The assembly is then flowed on a calibrated test bench where duty cycle vs. flow is recorded at multiple points. A unique serial number is laser-engraved on the valve body.
Random samples from each batch are subjected to 10 million operational cycles on a test pump, followed by disassembly and wear measurement. Thermal shock testing (-40°C to 120°C, 500 cycles) verifies seal integrity and coil insulation. Salt spray testing (500 hours) confirms corrosion resistance. Only valves passing all criteria are released for sale.
This rigorous quality system ensures every 1001366035 metering unit performs identically to the original factory component. Consistency is critical for maintaining rail pressure stability and emissions compliance across your entire fleet.
Genuine Shacman metering unit 1001366035 is stocked by authorized distributors worldwide. Parts are supplied in sealed anti-static bags with protective caps over the ports, individually boxed and labeled with OEM part number and serial number. Bulk packs of 5 units are available for fleet maintenance depots.
Expedited shipping options are available through Shacman’s regional logistics hubs in North America, Europe, Asia, Africa, and the Middle East, with typical delivery within 3-5 business days. Always purchase from certified dealers and verify the holographic authenticity label. Counterfeit metering units often have incorrect coil resistance, poor linearity, or missing strainers, leading to immediate diagnostic trouble codes.
For preventive maintenance programs, automated replenishment ensures your workshop never runs out of essential metering units. Keep a stock of 1001366035 on every service truck to handle fuel system repairs in the field.
The Shacman Metering Unit 1001366035 is a precision solenoid valve that governs fuel entry into the high-pressure common rail pump on X5000 engines. With its linear flow characteristics, fast response, and integrated filtration, this genuine OEM component ensures accurate rail pressure, smooth engine operation, and lower emissions. By choosing 1001366035, you eliminate pressure-related fault codes, protect injectors and pumps, and restore fuel economy. Don’t trust aftermarket metering valves – insist on genuine Shacman quality for your common rail fuel system.
