The Engine harness is the central nervous system of the HOWO MAX 4X2 MC13 engine, distributing power and signals to injectors, sensors, and actuators. This comprehensive Engine harness kit includes the fuel injector wiring harness, all mounting brackets, and every fastener required for a complete installation. When you choose authentic Howo Parts, This part guarantees OE fitment and reliable electrical connections. Below are detailed descriptions of every component included with This part assembly.
The fuel injector wiring harness is the main electrical cable assembly that connects the engine control unit to all six fuel injectors on the MC13 engine. This part component is made from high temperature cross linked polyethylene (XLPE) insulated wires, rated for continuous operation at 125°C. The harness includes sealed Deutsch connectors at each injector, plus the main ECU connector. It is pre formed to the exact routing of the engine, with integrated clips that snap into the wiring harness brackets.
Eleven M6x16 flange bolts (supplied as 7 + 4) with property class 10.9 and length 16mm are used to secure the wiring harness brackets to the engine block, cylinder head, and intake manifold. These Engine harness bolts feature an integral flange that distributes clamping load, a zinc nickel coating for corrosion resistance, and a pre applied MAN183 thread locking patch. Torque these Engine harness bolts to 12 Nm.
The wiring harness pipeline bracket is a stamped steel or aluminum component that holds the Engine harness away from hot surfaces and moving parts. This part bracket is powder coated black and includes multiple slots for cable tie attachment. It mounts to the cylinder head using two M6x16 bolts and provides stand off height to prevent chafing.
The engine wiring harness bracket is a larger support structure that secures the main trunk of the Engine harness along the valve cover and intake manifold. This part component is made from 3mm thick steel with a corrosion resistant coating. It includes pre drilled mounting holes for M6 and M8 bolts and has rubber lined clips that hold the wiring without damaging the insulation.
The fuel injector wiring harness bracket is a small, specialized bracket that supports the injector harness near the cylinder head. This part bracket positions the wiring loom so that it does not contact the injector return lines or rocker cover. It is typically made from zinc plated steel and uses one M6 or M8 bolt for attachment.
Eight M8x16 flange bolts (supplied as 3+1+2+2) with class 10.9 and 16mm length are used to secure heavy duty Engine harness brackets and the main harness support. The 8mm diameter provides greater clamping force for larger brackets. Torque these Engine harness bolts to 25 Nm. The MAN183 thread locking patch ensures vibration proof retention.
An additional wiring harness bracket (material encoding 200V25441-0342) is provided for supplementary routing of sensor and actuator wires. This part bracket is a universal design that can be used where extra cable support is needed, such as near the EGR valve or turbocharger actuator. It is made from 2mm spring steel with a black oxide finish and includes a rubber edge protector.
The lock washer (material encoding MQ6-16169-0047) is a split type spring washer used under a bolt head to prevent loosening due to vibration. This part lock washer is made from hardened spring steel with a phosphate coating. It is used in conjunction with the hexagon head bolt to secure a bracket where a flange bolt is not suitable.
Two M6x20 flange bolts with class 10.9 and 20mm length are used where the Engine harness bracket requires a slightly longer fastener to pass through thicker mounting tabs. The extra 4mm over the M6x16 provides thread engagement through stacked components. Torque these Engine harness bolts to 12 Nm.
The double end bolt M10X47 is a stud with threads on both ends (8.8 grade), used to secure a wiring harness bracket to a deep boss in the engine block. This part stud has a 47mm overall length and is threaded M10 on both ends. One end is screwed into the engine block, and a nut (not included) clamps the bracket. This component provides precise alignment for the Engine harness routing.
Two big washers (inner diameter 6.4mm, outer diameter 18mm) are supplied for use under the M6 bolts where a larger bearing surface is needed. These Engine harness washers are made from hardened steel (200HV) with a zinc plated finish. They prevent the bolt head from pulling through softer aluminum brackets.
The waveform elastic washer (material encoding Q41804) is a wave shaped spring washer that provides preload to prevent loosening. This part washer is used with the hexagon head bolt where vibration is a concern. It is made from spring steel and compresses as the bolt is torqued, maintaining constant tension.
One hexagon head bolt (material encoding ZQ150B0414) with M4x14 dimensions and grade 8.8 is used to secure a small electrical component bracket. This part bolt is made from zinc plated steel and has a standard hex head. Torque to 6 Nm. It is used where a flange bolt would be too large or where a lock washer is already employed.
Engine harness – genuine HOWO wiring loom and bracket kit for MAX 4X2 MC13
This part kit includes the fuel injector harness, all brackets, and every fastener (M6, M8 flange bolts, double end stud, washers) required for a full engine wiring installation. No extra parts needed.
The fuel injector wiring harness uses cross linked polyethylene insulation, rated for 125°C continuous operation. The Engine harness withstands the extreme under hood temperatures of the MC13 engine without insulation degradation.
All Engine harness bolts are property class 10.9 with MAN183 thread locking patches, resisting loosening under vibration. The M6 bolts are torqued to 12 Nm, M8 to 25 Nm, ensuring secure bracket mounting.
Every Engine harness bracket is stamped and pre formed to match the MC13 engine’s mounting bosses exactly. No drilling or modification is required; the Engine harness clips into place using factory holes.
The Engine harness connects the ECU to the fuel injectors, camshaft and crankshaft position sensors, oil pressure and temperature sensors, coolant temperature sensor, intake air temperature and pressure sensors, and the turbocharger actuator. The fuel injector wiring harness is a dedicated sub harness that branches to each injector, delivering high current pulses to open the injector solenoids.
The Engine harness is routed along the cylinder head and valve cover, secured by the various brackets. The double end stud provides a mounting point for a harness clip on a deep engine boss. The lock washer and waveform washer prevent fasteners from loosening due to engine vibration. A properly installed Engine harness ensures reliable engine management, correct injection timing, and accurate sensor readings. Any chafing or loose connection in the Engine harness can cause intermittent faults, poor performance, or a no start condition.
Before installing the Engine harness, disconnect the battery and remove the old harness. Install the wiring harness pipeline bracket and engine wiring harness bracket onto the cylinder head using M6x16 and M8x16 bolts (torque M6 12 Nm, M8 25 Nm). Mount the fuel injector wiring harness bracket with its M6 bolts. Lay the fuel injector wiring harness into the brackets, securing it with cable ties or built in clips.
Connect the injector connectors, ensuring each clicks into place. Install the double end stud into the engine block (torque 30 Nm). Attach the remaining bracket using the hexagon head bolt with lock washer and waveform washer. Secure any free hanging wires with the big washer under the M6 bolts. Reconnect the battery and perform a full system check using a diagnostic scanner. The Engine harness installation is now complete.
If the Engine harness causes intermittent injector faults, inspect the connectors for corrosion or loose pins. A chafed wire in the Engine harness will expose copper and cause short circuits; use a multimeter to check for continuity between wires. If a bracket is loose, retorque the Engine harness bolts. A missing lock washer can allow a bolt to back out;
replace with the correct hardware. The double end stud should be checked for tightness; if it is loose, re install with thread locker. Waveform washers that have been compressed may lose their spring tension; replace them if the bolt loosens. Always route the Engine harness away from the exhaust manifold and turbocharger to avoid heat damage.
The Engine harness requires no regular maintenance, but it should be inspected during every engine service (every 50,000 km). Look for signs of chafing, cracking, or heat damage on the Engine harness wires. Verify that all brackets are secure and that the fasteners are tight. The double end stud should be checked for torque.
The lock washers and waveform washers can be reused if not deformed, but it is good practice to replace them if the Engine harness is disturbed. Keep the Engine harness clean and free from oil contamination, as oil can degrade the insulation over time.
This part kit is specifically designed for the SINOTRUK MC13 engine used in HOWO MAX 4X2 tractors, SITRAK C7H, and HOWO T7H trucks. It fits all production years from 2018 onward. The fuel injector wiring harness is compatible with Bosch EDC17 ECU variants. The Engine harness brackets are also compatible with MC11 engines, though the main harness length may differ. This part kit is not compatible with older WD615 or D10 engine series. Always verify your engine serial number before ordering This part kit.
Aftermarket Engine harness kits often use inferior PVC insulation that melts or cracks within months. The connectors in copy harnesses may not have the same locking strength, leading to intermittent connections. Non genuine brackets may have the wrong bolt hole spacing, forcing the technician to bend them,
which can cause the Engine harness to be routed incorrectly and chafe. The fasteners in generic kits may not be grade 10.9 and can snap or loosen. Genuine HOWO Engine harness components are manufactured to SINOTRUK’s exact specifications, using high temperature XLPE wire, weather sealed connectors, precision stamped brackets, and certified grade 10.9 bolts. The small additional cost of a genuine Engine harness is insignificant compared to the cost of engine downtime caused by electrical faults.
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