WEICHAI WP12 Crankshaft Assembly is the heart of the renowned WP12 heavy-duty diesel engine, engineered to withstand extreme torque and high-cycle fatigue in commercial trucks and construction machinery. As a core rotating component, it converts linear piston motion into rotational power with exceptional precision. When you choose genuine WEICHAI Engine Parts, you guarantee maximum durability, perfect fitment, and extended service life for your fleet. The WEICHAI WP12 Crankshaft Assembly undergoes rigorous heat treatment and dynamic balancing, reducing vibration and enhancing engine stability.
Engineered from high-strength alloy steel, this crankshaft assembly ensures reliable performance under the most demanding conditions, delivering consistent power output and fuel efficiency. Every WEICHAI WP12 Crankshaft Assembly meets strict OEM tolerances, making it the ideal replacement part for overhaul or repair projects.
The WEICHAI WP12 Crankshaft Assembly is a precision-engineered forged steel component designed specifically for the WP12 series diesel engine (11.596L displacement), widely used in heavy trucks, dumpers, and marine generators. This assembly converts the reciprocating motion of 6 pistons into rotational torque, directly influencing the engine’s power delivery and smoothness. Its multi-counterweight design cancels harmful inertia forces, ensuring stable operation at speeds up to 2100 rpm.
Manufactured under strict ISO/TS 16949 standards, each WEICHAI WP12 Crankshaft Assembly undergoes induction hardening and nitriding treatment, achieving exceptional surface hardness (52-58 HRC) and wear resistance. The fillet rolling process strengthens the journal transitions, preventing crack propagation under cyclic loads. This makes the crankshaft capable of handling peak cylinder pressures exceeding 200 bar, crucial for turbocharged aftercooled engines.
The assembly includes eight counterweights, precision-ground main and rod journals with mirror-like finish (Ra ≤0.2µm), and optimized oil holes for efficient lubrication. When paired with high-quality bearings, the WEICHAI WP12 Crankshaft Assembly significantly reduces friction losses, contributing to lower fuel consumption and extended oil change intervals. It is a direct replacement for OE part numbers 612630080001 and related variations.
Whether you are rebuilding a fleet of SHACMAN, SINOTRUK, or FOTON heavy vehicles, the authentic WEICHAI WP12 Crankshaft Assembly guarantees dimensional accuracy and rotational balance. Backed by rigorous magnetic particle inspection and dynamic balancing (within 5g·cm), this component eliminates engine vibrations, prolongs bearing life, and ensures your diesel engine operates at peak efficiency for thousands of operating hours.
Product Parameters of WEICHAI WP12 Crankshaft Assembly
NO.
Part NO.
Description
1
612630080001
Crankshaft Forged Steel (Complete Assembly)
2
612630080010
Main Bearing Set (Upper+Lower, Standard)
3
612630080015
Thrust Washer Set (4 pcs, 0.10mm oversize)
4
612630080022
Crankshaft Timing Gear
5
612630080030
Rear Crankshaft Oil Seal (PTFE)
6
612630080041
Crankshaft Vibration Damper Pulley
7
612630080055
Connecting Rod Journal Bolts (12.9 grade)
8
612630080062
Pilot Bearing for Crankshaft Flange
Why Choose Our WEICHAI WP12 Crankshaft Assembly?
1. OEM-grade metallurgy & process – Our WEICHAI WP12 Crankshaft Assembly is produced using micro-alloy forged steel, followed by controlled quenching and tempering. This yields superior tensile strength (≥900 MPa) and impact toughness, eliminating premature fatigue failures common with counterfeit parts. Each unit is serial-number traceable.
2. Rigorous quality assurance – Every crankshaft is 100% inspected via ultrasonic testing, magnetic particle inspection, and CMM verification of all critical dimensions. The dynamic balance correction ensures residual unbalance less than 10g·cm, providing smooth engine operation and reduced bearing stress. This translates into lower maintenance costs for fleet owners.
3. Direct fit, no modifications – Designed to interchange with original WP12 engine specifications, our WEICHAI WP12 Crankshaft Assembly matches factory journal diameters, flange patterns, and oil drilling configurations. This eliminates installation hassles and guarantees compatibility with genuine WP12 connecting rods, flywheels, and main bearings.
4. Competitive pricing & global stock – We maintain a dedicated inventory of WEICHAI WP12 Crankshaft Assembly units in regional warehouses, ensuring fast delivery and reduced downtime. Backed by a 12-month warranty against manufacturing defects, we support engine rebuilders and workshops with technical datasheets and expert after-sales support.
What are the Routine Maintenance Considerations for the WEICHAI WP12 Crankshaft Assembly?
Proper lubrication is the first line of defense for the WEICHAI WP12 Crankshaft Assembly. Always use high-quality diesel engine oil (API CK-4 or higher) and change oil filters at recommended intervals (every 25,000–30,000 km for heavy trucks). Contaminated oil accelerates journal scoring and bearing fatigue. Monitor oil pressure frequently; any drop below 2.5 bar at idle could indicate bearing clearance issues related to the crankshaft.
Regular inspection of the crankshaft vibration damper and pulley is essential. A worn elastomer damper can cause torsional vibrations, leading to cracks in the WEICHAI WP12 Crankshaft Assembly. Replace the damper every 500,000 km or if you notice rubber swelling or misalignment. Additionally, check the front and rear crankshaft seals for leaks — oil seepage not only wastes lubricant but also allows debris entry.
During engine overhauls, measure main journal and connecting rod journal ovality and taper using a micrometer. Service limit for journal diameter reduction should not exceed 0.08mm. If any scoring or blue discoloration is found, the WEICHAI WP12 Crankshaft Assembly must be reground (if undersize bearings are available) or replaced. Always use genuine WP12 bearing shells with correct oversize grades to maintain proper oil clearance (0.045–0.082mm).
Periodically verify flywheel runout and torque converter alignment. Excessive flywheel runout (>0.15mm) applies abnormal bending moment to the crankshaft flange. When reinstalling the WEICHAI WP12 Crankshaft Assembly, always tighten main bearing cap bolts to factory torque specifications (first stage 120Nm + 90° angle) using a calibrated torque wrench. Following these practices ensures the crankshaft lasts beyond 1,200,000 km in typical line-haul applications.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
