The part is a critical component of the engine cooling system, directing coolant between the water pump, cylinder block, radiator, and heater core. This Coolant pipe assembly ensures proper thermal management, prevents localized overheating, and maintains the engine at optimal operating temperature. When you choose authentic Howo Parts, this Coolant pipe kit guarantees leak free connections and reliable cooling performance. Below are detailed descriptions of every component included with this Coolant pipe assembly kit.
Two coolant elbows are supplied, one with material encoding 200V06302-0657 and another with 201V06302-0759. These Coolant pipe elbows are made from die cast aluminum with a corrosion resistant coating, featuring a 90 degree bend that redirects coolant flow from the cylinder head to the water pump inlet. The part elbows include precision machined O ring grooves that accept the supplied sealing rings, ensuring a drip tight connection even under thermal expansion. The two elbows serve different locations on the engine; one connects to the thermostat housing, while the other attaches to the EGR cooler circuit. Each Coolant pipe elbow is pressure tested at 2.5 bar before leaving the factory.
This O ring with dimensions 60mm inner diameter and 3mm cross section is made from FPM70 fluoroelastomer. It seals the interface between a Coolant pipe and the engine block or water pump housing. The FPM70 material provides excellent resistance to hot coolant, steam, and temperatures up to 200°C. This O ring must be lubricated with coolant before installation to prevent rolling or pinching during assembly of The part.
This plug in pipe has a 62mm outer diameter and DN51 internal diameter, used to connect the radiator outlet to the water pump inlet. The part section is made from steel with a zinc nickel coating and features a swaged end that accepts a rubber hose secured by a constant tension clamp. This pipe integrates into the lower Coolant pipe circuit and includes a mounting bracket for additional support.
This plugged pipe has a 44mm outer diameter and DN35 internal diameter, serving as a bypass line in The part system. It connects the cylinder head coolant outlet to the thermostat housing bypass port, allowing coolant to circulate during engine warm up before the thermostat opens. The plugged pipe is manufactured from seamless steel tube with a black oxide finish and includes a pressed in plug at one end.
Three M8x50 flange bolts with property class 10.9 and 50mm length secure The part brackets and support clamps to the engine block. These bolts have an integral flange that distributes clamping load evenly, eliminating the need for washers. Torque these Coolant pipe mounting bolts to 25 Nm to prevent loosening from engine vibration.
This O ring has a 57mm inner diameter and 4.5mm cross section, made from EPDM70 rubber. It seals The part connection to the water pump or thermostat housing. EPDM70 is specifically formulated for long term exposure to ethylene glycol coolant at temperatures up to 130°C. This O ring provides a resilient, leak proof seal that maintains flexibility over the life of The part assembly.
The water pipe (material encoding 200-98182-0089) is a main Coolant pipe that runs along the side of the cylinder block, distributing coolant to each cylinder. This fabricated steel pipe has multiple outlets, each equipped with a sealing ring groove and retaining clip. The water pipe is coated internally and externally with a zinc based anti corrosion layer to prevent rust formation that could block coolant passages. This Coolant pipe must be replaced if any corrosion pitting is detected.
The hose joint is a brass or steel fitting that provides a transition between the rigid Coolant pipe and a flexible rubber hose. One hose joint is supplied, featuring a barbed end for hose retention and a threaded end with a sealing washer for The part connection. This joint allows easy disconnection of The part during engine servicing without cutting hoses.
This composite sealing washer has an inner diameter of 12.7mm and outer diameter of 18.0mm, made from a steel outer ring bonded with an FPM rubber sealing element. It is used under the bolt heads or banjo fittings that secure The part to the thermostat housing. The FPM1 rubber provides excellent resistance to coolant and high temperatures, ensuring a leak free seal for The part flange joint.
Three M8x25 flange bolts with class 10.9 strength and 25mm length secure The part support brackets and the water pipe retaining clips. These bolts have a shorter length than the M8x50 bolts and are used where engine block bosses have less thread depth. Torque these Coolant pipe bolts to 25 Nm in a crossing pattern to ensure even clamping of the pipe flanges.
Coolant pipe – genuine HOWO engine cooling system pipe kit for MAX 4X2 MC13
All Coolant pipe components are made from either aluminum or zinc nickel coated steel, with internal anti corrosion treatment. This Coolant pipe kit resists electrolysis and pitting, ensuring that no rust particles enter the water pump or radiator, prolonging the life of the entire cooling system.
The part kit includes FPM and EPDM O rings specifically selected for coolant service. These seals maintain their elasticity even after thousands of thermal cycles, preventing The part joints from leaking when the engine is cold or hot.
Every Coolant pipe flange and elbow in this kit is CNC machined to exacting tolerances, with surface finishes below 1.6 Ra. This guarantees that The part assembly seals perfectly against the engine block and water pump without the need for excessive bolt torque.
This Coolant pipe kit includes every O ring, sealing washer, and mounting bolt required for installation. No additional hardware purchases are necessary. The part assembly comes with grade 10.9 flange bolts that provide consistent clamp load without galling.
The part network on the MC13 engine is a complex web of rigid pipes and flexible hoses that distribute coolant to the cylinder block, cylinder head, EGR cooler, turbocharger, oil cooler, and heater core. The water pump pushes coolant through the engine block water jacket, where it absorbs combustion heat. The heated coolant then flows through the cylinder head to the thermostat housing via The part elbows.
When the thermostat is closed, The part bypass circuit recirculates coolant back to the water pump for rapid warm up. When the thermostat opens, The part directs coolant to the radiator for cooling. The main water pipe runs along the side of the block, feeding each cylinder with fresh coolant through individual ports. A leak in any Coolant pipe can cause overheating, loss of cabin heat, and engine damage. Therefore, using a genuine Coolant pipe kit ensures that all passages are correctly sized and routed for the MC13’s specific flow requirements.
Before installing The part, drain the cooling system and remove the old pipes. Clean all mounting surfaces on the engine block and water pump. Lubricate each O ring with fresh coolant and install them into their respective grooves on The part elbows and water pipe. Position the main water pipe onto the engine block studs, then install The part elbows and plugged pipes.
Hand tighten all flange bolts, then torque the M8 bolts to 25 Nm in a sequence starting from the center. Install the hose joint and attach the rubber hoses with new constant tension clamps. Refill the cooling system with the correct mixture of antifreeze and distilled water. Start the engine and allow it to reach operating temperature while checking all Coolant pipe connections for leaks. Bleed any trapped air from the system using The part bleed screw on the thermostat housing.
If the engine overheats and coolant is found dripping from a Coolant pipe joint, the O ring may have failed or the bolt torque may be insufficient. Inspect The part flange for warpage using a straightedge; if warped, replace The part. If a Coolant pipe is corroded and shows pinhole leaks, the entire Coolant pipe section must be replaced, as patching is not reliable.
A hissing sound from the engine bay after shutdown may indicate a Coolant pipe crack expanding under pressure. Use a pressure tester on the cooling system to identify the leaking Coolant pipe. If The part bolts keep loosening, replace them with new flange bolts from a genuine kit, as old bolts may have lost their thread locking coating. A sudden loss of coolant without visible external leakage could mean an internal Coolant pipe leak into the engine oil; check the oil dipstick for milky appearance.
The part assembly should be inspected during every coolant change, typically every 80,000 km. Check all Coolant pipe connections for white or green crusty deposits that indicate dried coolant leaks. Inspect The part surfaces for rust or pitting; replace any Coolant pipe that shows deep corrosion.
The O rings in The part system do not have a fixed replacement interval but should be replaced if The part is removed for any reason, as old O rings will have taken a compression set. After replacing a Coolant pipe, always use new bolts and new sealing washers. Keep the area around The part free from oil or fuel leaks, as these can degrade the rubber hoses attached to The part.
This Coolant pipe kit is specifically designed for the SINOTRUK MC13 engine found in HOWO MAX 4X2 tractors, SITRAK C7H, and HOWO T7H trucks. The part assembly fits all production years from 2018 onward and is compatible with both standard and heavy duty radiator configurations.
The part dimensions and routing are optimized for the MC13’s inline six cylinder layout. This Coolant pipe kit is not compatible with MC11 or WD615 engine platforms, which use different pipe diameters and mounting brackets. Always verify your engine serial number before ordering this Coolant pipe kit.
Aftermarket Coolant pipe components are often made from thinner steel that rusts through quickly, or from aluminum alloys that suffer from electrolytic corrosion. The O rings in copy Coolant pipe kits may be made from ordinary nitrile rubber that hardens and cracks within months, causing sudden coolant loss. A genuine HOWO Coolant pipe is manufactured from the correct gauge of zinc nickel coated steel or cast aluminum with proper alloy composition,
and the sealing rings are made from FPM or EPDM as specified by the original design. The small additional cost of a genuine Coolant pipe is insignificant compared to the cost of an engine rebuild caused by a catastrophic coolant leak and subsequent overheating. For fleet operators, installing a genuine Coolant pipe kit reduces roadside breakdowns and ensures consistent thermal management across the entire vehicle fleet.
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