The 612600012208 Main Bearing Set is the cornerstone of a reliable, high‑performance crankshaft assembly, engineered to deliver exceptional load‑carrying capacity and minimal friction in modern diesel engines. This complete set of precision‑ground main bearings supports the crankshaft, ensuring smooth rotation, optimal oil film retention, and extended engine life. As a critical part of the genuine Howo/Sitrak truck parts range, the 612600012208 is manufactured to exact OEM standards, guaranteeing a perfect fit and outstanding reliability in HOWO, Sitrak, and compatible heavy‑duty powerplants. Whether you are performing an overhaul or building a fresh engine, this main bearing set provides the strength and dimensional accuracy required to withstand extreme combustion pressures and maintain crankshaft alignment, reducing wear and preventing costly failures.
The 612600012208 is not a collection of generic shells; it is a carefully matched set of main bearings developed using advanced tribological principles. Each bearing features a steel back for structural rigidity, overlaid with a high‑performance aluminum‑tin or copper‑lead alloy that provides excellent embedability, conformability, and fatigue resistance. The bearing surfaces are precision‑machined to a mirror finish, reducing friction and enabling the formation of a stable hydrodynamic oil wedge. The set includes both upper and lower halves for each main journal, with locating tangs and oil holes precisely positioned to match the engine’s lubrication circuit.
High Load Capacity – The overlay alloy in the 612600012208 withstands peak cylinder pressures exceeding 180 bar, protecting the crankshaft journals from deformation.
Optimized Oil Film – The precision‑ground bearing surface promotes a uniform oil wedge, reducing hydrodynamic friction and minimizing heat generation.
Tight Dimensional Control – Every shell is measured to within microns, ensuring correct bearing clearance and consistent crush height for a secure fit in the housing.
Embedability – The soft overlay layer safely traps microscopic debris, preventing scoring of the crankshaft journal and extending both bearing and shaft life.
The 612600012208 main bearing set is designed to match the original equipment specifications for a broad range of HOWO and Sitrak engines, including the widely used WP10, WP12, and WP13 series, as well as earlier WD615 variants. The bearing set includes the correct number of shells for all main journals, with the correct half‑shell orientation (upper and lower) and tang positions. The oil hole locations align perfectly with the engine block gallery, ensuring unrestricted oil flow to the crankpin and connecting rod bearings. By choosing this set, you eliminate the risks associated with aftermarket bearings that may have incorrect width, thickness, or material composition.
Each set has been validated through extensive dynamometer testing and field trials, confirming its ability to maintain clearance and oil pressure over thousands of hours of operation. Fleet maintenance records show that engines rebuilt with the 612600012208 consistently achieve extended overhaul intervals, reducing total cost of ownership. The set is supplied in a protective tray that preserves the precision surfaces and prevents damage during transport and storage.
Correct installation of the 612600012208 main bearings is essential for achieving optimum performance and longevity. Begin by thoroughly cleaning the main bearing bores in the engine block and the bearing caps, ensuring that no debris or old sealant remains. Inspect the crankshaft journals for scoring or taper; if any defects are found, the crank must be reground or replaced before fitting new bearings. When placing the upper bearing shells into the block, ensure that the locating tangs engage fully in their slots. The lower shells install in the bearing caps in the same manner. Apply a thin film of clean engine oil or assembly lube to both the bearing surfaces and the crankshaft journals.
Tighten the main bearing caps to the manufacturer’s specified torque and angle sequence, using a calibrated torque wrench. After torqueing, check the crankshaft end‑float and bearing clearance using Plastigage or a dial bore gauge. The correct clearance for the 612600012208 is typically between 0.05 and 0.09 mm, but always refer to the engine service manual. If clearance is outside the specified range, verify that the correct bearing grade has been installed. With careful installation, these bearings will provide a reliable, low‑friction foundation for your engine.
The 612600012208 main bearing set is manufactured in a state‑of‑the‑art facility certified to IATF 16949. The production process includes 100% inspection of each shell for critical dimensions: wall thickness, overall width, bore diameter, and tang location. The overlay and lining materials are subjected to spectrographic analysis to verify alloy composition. Every shell is visually inspected under magnification to ensure a flawless surface finish, free from scratches, pits, or porosity.
In addition, random samples from each batch undergo destructive testing: fatigue testing on a dynamic bearing test rig, hardness mapping, and adhesion tests of the overlay layer. We also perform clearance simulation on a master crankshaft to confirm that the assembled set yields the correct running clearance within the specified tolerance band. This comprehensive quality regimen guarantees that every 612600012208 set delivers the same high performance as the original OEM bearings, giving you full confidence in your engine rebuild.
Engine rebuilders and fleet maintenance supervisors consistently select the 612600012208 because it delivers measurable improvements: reduced bearing wear, stable oil pressure, and extended overhaul intervals. The set’s consistent quality eliminates the variability often seen with economy bearings, giving workshops the confidence to warranty their work. Many fleets have reported a 20% increase in bearing life after switching to this OEM‑grade set, translating into fewer roadside failures and lower overall maintenance costs.
The 612600012208 is also available with matching thrust washers and connecting rod bearings for a complete bottom‑end kit, simplifying parts ordering. Its sturdy packaging ensures that the precision‑ground surfaces remain protected until the moment of installation. When you choose this set, you are partnering with a product that has been proven in the world’s most demanding heavy‑duty applications.
In summary, the 612600012208 Main Bearing Set is a premium engine component that combines advanced metallurgy, precision manufacturing, and stringent quality control to provide exceptional crankshaft support and durability. Its exact OEM fitment, optimized oil film characteristics, and high load capacity make it the ideal choice for HOWO and Sitrak engines operating in the most challenging conditions. By installing this set, you are investing in the long‑term health of your engine, minimizing the risk of catastrophic bearing failure and maximizing uptime.
Don’t risk your engine’s future with substandard bearings. Choose the 612600012208 for your next rebuild and experience the peace of mind that comes from using a component engineered to the highest standards. With its proven track record and unwavering reliability, this main bearing set is the definitive choice for professionals who demand the best. Keep your crankshaft rotating smoothly and your engine performing at its peak with the 612600012208.
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