The 612600020036 Crankshaft Timing Gear is a precision‑engineered component that drives the camshaft and fuel injection pump, ensuring exact valve and injection timing in heavy‑duty diesel engines. This gear is manufactured from high‑grade alloy steel with induction‑hardened teeth, providing exceptional wear resistance and dimensional stability. As a critical part of genuine Howo/Sitrak truck parts, the 612600020036 guarantees perfect meshing with the camshaft gear and idler gear, maintaining the precise synchronization required for optimal combustion and power delivery. Whether you are rebuilding an engine or replacing a worn timing gear, this component delivers the strength, accuracy, and reliability needed to keep your HOWO or Sitrak truck performing at its best.
The 612600020036 is far more than a simple gear; it is a meticulously engineered component that ensures the exact synchronization between the crankshaft and the camshaft. The gear teeth are cut with high‑precision hobbing and then induction‑hardened to achieve a uniform surface hardness of 58–62 HRC, providing outstanding resistance to pitting and wear. The gear’s inner bore is honed to a precise fit on the crankshaft, and the keyway is broached to exact dimensions, ensuring a secure, backlash‑free connection. This gear is dynamically balanced to minimize vibration, reducing stress on the timing gear train and extending the life of the entire valve train.
The gear’s tooth profile is designed to provide smooth, quiet operation even at high engine speeds. The involute geometry ensures constant velocity transmission, eliminating speed fluctuations that can affect fuel injection timing and valve overlap. The 612600020036 is compatible with both standard and high‑performance camshaft profiles, making it a versatile choice for engine rebuilders. Its robust construction ensures that it can withstand the torsional oscillations and shock loads typical of heavy‑duty diesel operation, delivering reliable performance mile after mile.
Induction‑Hardened Teeth – The gear teeth are hardened to 58–62 HRC, providing exceptional wear resistance and extending the service life of the 612600020036.
Dynamic Balancing – Each gear is individually balanced to eliminate vibration, reducing noise and wear on the timing gear train.
Precision Keyway – The keyway is broached to tight tolerances, ensuring a positive drive connection without backlash.
Involute Tooth Profile – The optimized gear geometry provides smooth, quiet operation and consistent timing accuracy.
The 612600020036 is dimensionally identical to the original equipment crankshaft timing gear used in HOWO, Sitrak, and Shacman heavy‑duty engines. It is specifically designed for the WP10, WP12, and WP13 series, as well as the WD615 engine family. The gear’s pitch diameter, tooth count, and pressure angle match the mating camshaft and idler gears perfectly, ensuring correct valve timing and injection phasing. The inner bore diameter and keyway size are machined to precise OEM tolerances, guaranteeing a secure fit on the crankshaft snout. By choosing this genuine component, you eliminate the risks associated with aftermarket gears that may have incorrect tooth profile or poor concentricity, which can lead to timing errors, increased emissions, and reduced engine performance.
The 612600020036 has been validated through extensive dynamometer and field testing, confirming its ability to maintain accurate timing over hundreds of thousands of kilometers. Fleets that have standardized on this gear report improved fuel economy, reduced emissions, and fewer timing‑related failures. Its robust packaging ensures that the precision teeth remain protected until installation.
Installing the 612600020036 correctly is essential for achieving proper timing and ensuring long service life. Begin by thoroughly cleaning the crankshaft snout and the keyway, removing any old sealant, debris, or corrosion. Inspect the gear’s bore and keyway for any burrs or damage; if any are found, carefully dress them with a fine file. Apply a thin layer of clean engine oil to the crankshaft and the gear bore to facilitate installation. Align the keyway in the gear with the key on the crankshaft and gently tap the gear into place using a soft‑faced mallet or a suitable installation tool. Do not use excessive force, as this can damage the gear or the crankshaft.
After installation, verify that the gear is fully seated against the crankshaft shoulder and that there is no axial play. Install the retaining bolt or nut and torque it to the manufacturer’s recommended specification, typically 250–300 Nm for most HOWO engines. Finally, rotate the crankshaft through two full revolutions and check the timing marks on the camshaft and injection pump to confirm correct synchronization. With careful installation, the 612600020036 will provide reliable, accurate timing for the life of the engine.
Each 612600020036 crankshaft timing gear is manufactured in an IATF 16949‑certified facility, adhering to the strictest quality standards. The raw steel is spectrographically analyzed to verify its composition, and the forging is inspected for grain flow and freedom from defects. After machining, the gear teeth are checked for profile accuracy, lead, and runout using specialized gear testers. The gear is then induction‑hardened and tempered to achieve the specified hardness profile. A final 100% inspection verifies the keyway dimensions, bore diameter, and overall geometry.
Random samples from each batch are subjected to a hardness test, a gear‑mesh test with a master gear, and a visual inspection for surface defects. The gear is also balanced to G6.3 grade to minimize vibration. This comprehensive quality regimen ensures that every 612600020036 delivers the same reliable performance as the original OEM component, giving you complete confidence in your engine rebuild.
Engine rebuilders and fleet maintenance professionals consistently choose the 612600020036 because it delivers precise timing and exceptional durability. The gear’s hardened teeth and precise machining ensure that timing remains accurate over extended intervals, reducing the risk of performance loss and emissions issues. Many workshops have reported that using this genuine timing gear eliminates the need for frequent timing adjustments and reduces warranty claims related to timing chain or gear wear.
Moreover, the 612600020036 is readily available and comes with a clear installation guide. Its robust packaging protects the precision teeth during shipping. When you choose this timing gear, you are selecting a component that has been engineered and tested to the highest standards, offering the perfect balance of accuracy, durability, and value.
In summary, the 612600020036 Crankshaft Timing Gear is a precision‑engineered component that ensures exact valve and injection timing, optimizing engine performance and reliability. Its high‑grade steel construction, hardened teeth, and meticulous quality control guarantee long service life and consistent accuracy. By investing in this genuine OEM‑grade part, you are protecting your engine from timing‑related issues that can lead to power loss, increased emissions, and catastrophic failure.
Don’t compromise on timing accuracy – choose the 612600020036 for your next engine rebuild. With its proven track record and widespread adoption by leading fleets and rebuilders, this timing gear is the smart choice for anyone who values reliability, efficiency, and peace of mind. Keep your engine perfectly timed and performing at its peak with the 612600020036 – the definitive choice for HOWO and Sitrak professionals.
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