The part is a high-strength connecting rod bolt specifically designed for SINOTRUK HOWO MAX 4X2 tractors equipped with MC11 and MC13 diesel engines. This 201-02400-6120-2 precision fastener secures the connecting rod cap, withstanding extreme combustion pressures exceeding 220 bar. When you need genuine HOWO Parts, this 201-02400-6120-2 is the exact OE replacement. Below are detailed descriptions of every part included with this 201-02400-6120-2 assembly.
The connecting rod bolt is the main component of The part. This 201-02400-6120-2 bolt is manufactured from non tempered alloy steel with a tensile strength exceeding 1,100 MPa. The part features an M13 x 1.5 metric fine thread and a total length of 66.5mm from under head to the end. The part is a torque to yield fastener, which means it permanently stretches during installation and must never be reused.
Each 201-02400-6120-2 bolt undergoes 100% magnetic particle inspection to detect any surface defects. The part is supplied pre lubricated with assembly oil to ensure consistent friction during tightening. This 201-02400-6120-2 connecting rod bolt is critical for the HOWO MC11 and MC13 engine families, including the HOWO MAX 4X2, SITRAK C7H, and HOWO T7H models. Using the correct 201-02400-6120-2 bolt is essential for bottom end reliability.
The part is manufactured from non tempered alloy steel with tensile strength exceeding 1,100 MPa. This 201-02400-6120-2 resists fatigue under peak cylinder pressures above 220 bar, ensuring reliable engine operation in your HOWO MAX 4X2. Trust The part for critical bottom end integrity.
The part features rolled threads rather than cut threads, providing up to 30% higher fatigue strength. This 201-02400-6120-2 eliminates stress risers that could lead to premature failure. The thread geometry of The part ensures consistent clamp load every time.
The part has a verified B10 lifespan of 1.5 million kilometers, validated through 4,000+ hours of bench testing and millions of road kilometers. Choose The part for proven durability in heavy duty applications.
Each order of 201-02400-6120-2 includes the correct quantity for one cylinder (two bolts). The part is supplied pre oiled and ready for installation. Order 201-02400-6120-2 for a complete rebuild of your MC11 or MC13 connecting rod assembly.
The part connecting rod bolt (material encoding 200V90490-0133) has an M13 x 1.5 metric fine thread and a total length of 66.5mm from under head to the end. The part is manufactured from non tempered alloy steel, chosen for its high tensile strength and resistance to hydrogen embrittlement. The part has a tensile strength rating of 1,100 MPa and yield strength exceeding 950 MPa.
Hardness of The part is controlled within 38 to 42 HRC. The part features a 13mm hex head with a captive flange that distributes clamping load evenly across the connecting rod cap. This 201-02400-6120-2 is designed as a torque to yield fastener.
The part is compatible with SINOTRUK MC11 and MC13 engine families, including the 430HP MC11 and 510HP MC13H used in the HOWO MAX 4X2 tractor. The part is also used in SITRAK C7H, HOWO T7H, and SITRAK TX trucks. Each cylinder requires two 201-02400-6120-2 bolts, with twelve units needed for a complete inline six cylinder engine rebuild.
The part has been tested to withstand peak combustion pressures up to 220 bar. The part has undergone 30,000 cycles of tension tension fatigue testing to validate its B10 lifespan. The part is supplied with a micro encapsulated thread locker pre applied to the threads, which activates upon tightening.
Manufacturing of The part includes cold heading, thread rolling, heat treatment, and surface finishing. The thread rolling process work hardens the thread roots of The part, providing up to 30% higher fatigue strength compared to cut threads. Each 201-02400-6120-2 undergoes 100% magnetic particle inspection to detect any surface cracks or inclusions. A tensile test is performed on each production batch of The part to verify compliance with mechanical property specifications. The part is individually stamped with a batch number and date code for full traceability. This 201-02400-6120-2 meets or exceeds all SINOTRUK original equipment specifications and is the same component supplied on new HOWO MAX 4X2 engines from the factory.
The part connecting rod bolt is a critical safety component in the engine assembly. A failure of The part would result in the connecting rod separating from the crankshaft, leading to catastrophic engine damage. For this reason, SINOTRUK specifies that The part must never be reused. The part is a torque to yield fastener that permanently stretches during the final tightening stage. Reusing a 201-02400-6120-2 cannot achieve the required clamp load and may lead to rapid fatigue failure. Always install new 201-02400-6120-2 bolts during any engine rebuild or connecting rod service.
Proper installation of The part is essential for engine reliability. Before installing new 201-02400-6120-2 bolts, thoroughly clean the threads in the connecting rod using a thread chaser, not a tap. Taps remove material and can weaken the threads. The part is supplied with a factory applied thread lubricant. Do not add additional lubricant unless specified, as this can alter the torque angle relationship.
Insert The part into the connecting rod cap, ensuring the bolt seats fully against the cap. Tighten The part to an initial torque of 30 Nm using a calibrated torque wrench. This first pass ensures the cap is seated correctly. After the initial torque, back The part off completely to zero, then retighten to 30 Nm to remove any thread friction variations. Finally, tighten The part through an additional 110 degrees of rotation using a torque angle gauge or a digital torque wrench with angle measurement.
The tightening sequence for the two 201-02400-6120-2 bolts on each connecting rod must be performed alternately in small increments. After the final 201-02400-6120-2 tightening, verify that the connecting rod cap is flush with the connecting rod body. Any gap exceeding 0.05mm indicates incorrect 201-02400-6120-2 installation or a damaged connecting rod. If a 201-02400-6120-2 is tightened beyond the specified angle, remove and discard that 201-02400-6120-2. Overtightening can cause The part to yield excessively, reducing clamp load and increasing the risk of fatigue failure. Undertightening leaves insufficient clamp load, allowing the connecting rod cap to separate during operation. Always use a new 201-02400-6120-2 if the correct angle is exceeded.
After installing all 201-02400-6120-2 bolts, rotate the crankshaft by hand to check for any binding. If the engine is difficult to rotate, check that each 201-02400-6120-2 is correctly tightened and that no connecting rod is misassembled. For the HOWO MAX 4X2 MC11 engine, The part torque specification is: first pass 30 Nm, second pass 30 Nm after backing off, final pass +110 degrees. The part must be tightened with the connecting rod installed on the crankshaft journal, not in a bench vise. After final tightening of The part, measure the connecting rod big end bore diameter using an inside micrometer. The standard bore diameter for the MC11 connecting rod with The part installed is 53.000 to 53.013 mm.
Common mistakes with The part include reusing old bolts, failing to clean threads, using the wrong torque sequence, adding extra lubricant, and not checking the final bore diameter. Avoid these errors to ensure The part provides the intended clamp load and fatigue life. After the engine has been run and then cooled down, retorquing The part is not recommended, as torque to yield fasteners cannot be tightened twice. If the engine is disassembled for any reason after run in, discard all 201-02400-6120-2 bolts and install new ones.
Engine knocking or rumbling noises from the lower end may indicate a loose 201-02400-6120-2. A loose 201-02400-6120-2 allows the connecting rod cap to move relative to the rod, producing a distinct knocking sound that increases with engine load. If a 201-02400-6120-2 is found loose during inspection, the engine must be completely disassembled, and all connecting rod bolts must be replaced. Do not simply retighten the loose 201-02400-6120-2, as the bolt has already been damaged by the movement.
Low oil pressure accompanied by metallic debris in the oil filter may indicate a failing 201-02400-6120-2 bearing surface. Early detection of a 201-02400-6120-2 problem can prevent catastrophic engine failure.
If the crankshaft cannot be turned by hand after tightening The part bolts, the connecting rod caps may be misaligned. Check that each 201-02400-6120-2 is correctly seated and that the cap is oriented properly. The mating surfaces of the connecting rod and cap have fracture split serrations that ensure correct alignment; if these serrations are damaged, The part cannot provide proper alignment. Replace both the connecting rod and The part bolts in that case. If a 201-02400-6120-2 shows signs of thread galling during installation, stop immediately and replace the bolt. Galling indicates insufficient lubrication or incorrect thread fit and may cause The part to seize before reaching the correct clamp load.
After engine assembly with new 201-02400-6120-2 bolts, perform a cylinder leak down test before starting the engine. An uneven leak down reading across cylinders may indicate inconsistent 201-02400-6120-2 tightening affecting cylinder head sealing indirectly. However, any bottom end noise after start up should be immediately investigated. If a 201-02400-6120-2 fails during operation, there will be a sudden loud bang, immediate loss of power, and usually a hole in the engine block. This situation is extremely dangerous. Always ensure that only properly trained technicians install The part bolts using calibrated tools.
The part connecting rod bolt is specifically designed for SINOTRUK MC series diesel engines, including the MC07, MC11, and MC13. This 201-02400-6120-2 is used in the following SINOTRUK and HOWO vehicle models: HOWO MAX 4X2 (all production years with MC11 or MC13 engines), HOWO T7H, SITRAK C7H, SITRAK TX, SITRAK C9H, HOHAN N7G, and HOHAN J7G.
The part is also used in MAN TGA engine platforms, as the MC series engines are based on MAN technology under license. The part is compatible with both Euro 2 and Euro 5 emission standard engines, as the connecting rod bolt specification did not change.
For HOWO MAX 4X2 tractors produced after 2019, The part is the standard factory component. The part is not cross compatible with earlier WD615 engine series, which use a different bolt size and thread pitch. If you are rebuilding an MC11 or MC13 engine, The part is the correct part number for the connecting rod bolts.
Each connecting rod requires two 201-02400-6120-2 bolts, and each engine requires 12 of these bolts. The part is available individually or in complete sets of 12 bolts for a full engine rebuild. Always verify your engine serial number before ordering, as very early MC11 engines may use a different connecting rod bolt specification.
The part is also used in the MC13 engine variant fitted to the HOWO MAX 4X2 510HP model. The higher torque output of the MC13H engine places even greater stress on The part, making correct replacement even more critical.
The part has been validated on the MC13H engine at power outputs of 510 HP and torque of 2,500 Nm. The part passed all durability tests on the MC13H platform, including 1,000 hours of full load operation. For engines that have been tuned beyond factory specifications, The part may not be sufficient, and aftermarket high performance connecting rod bolts should be considered. However, for all standard production HOWO MAX 4X2 tractors, the genuine 201-02400-6120-2 is the correct and recommended part.
The part is listed in the SINOTRUK electronic parts catalog (EPC) under the engine section, sub section “Connecting Rod and Piston.” The part appears in the EPC as a mandatory replacement item during any connecting rod or crankshaft service.
The part is shipped in SINOTRUK original packaging with the holographic authenticity seal. Each 201-02400-6120-2 package includes the specified number of bolts, a small quantity of assembly lubricant, and a torque specification card. Keep The part packaging for warranty purposes, as the batch number is required for any warranty claim.
Q: How many 201-02400-6120-2 bolts are needed for a full MC11 engine rebuild? A: The MC11 engine has 6 cylinders, each with 2 connecting rod bolts, requiring a total of 12 units of 201-02400-6120-2. Always order a complete set of 12 to ensure all bolts are from the same production batch for consistent clamping force.
Q: Can I reuse the old 201-02400-6120-2 bolts from my engine? A: No. The part is a torque to yield fastener that permanently stretches during the final tightening stage. Reusing a 201-02400-6120-2 will not achieve the required clamp load, increasing the risk of catastrophic engine failure. Always install new 201-02400-6120-2 bolts.
Q: What is the correct tightening torque for The part? A: The part must be tightened using a torque angle procedure: first pass 30 Nm, second pass 30 Nm after backing off, final pass +110 degrees. Do not substitute a simple torque value, as angle control is critical for torque to yield fasteners.
Q: Is The part compatible with my HOWO MAX 4X2? A: Yes, The part is compatible with all HOWO MAX 4X2 tractors equipped with MC11 or MC13 diesel engines. For MAX 4X2 models with the WD615 engine, a different connecting rod bolt is required. Check your engine serial number to confirm.
Q: What material is The part made from? A: The part is manufactured from non tempered alloy steel with a tensile strength of 1,100 MPa. The part is surface finished with a manganese phosphate coating to provide corrosion resistance and consistent friction characteristics during tightening.
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