The oil pan and oil pump are the foundation of the engine lubrication system. A complete oil pan and oil pump assembly ensures reliable oil pressure and proper oil storage. This genuine HOWO oil pan and oil pump kit includes the outer rotor, inner rotor, shaft, screws, cover, O‑rings, flange bolts, oil suction pipe, oil pan assembly, gasket, and block set. When you choose authentic Howo Parts, you receive a complete oil pan and oil pump assembly engineered for the MC13 engine. For other essential engine components, see our cylinder block kit and starter motor.
The outer rotor of engine oil pump is a precision‑machined gear that rotates inside the pump housing. One outer rotor is supplied, made from powder metal with a hardened surface. The outer rotor has five lobes and drives the inner rotor. It is responsible for creating suction to draw oil from the pan. In the oil pan and oil pump system, this rotor must be paired with the inner rotor.
The rotor in engine oil pump is the inner gear that meshes with the outer rotor. One inner rotor is supplied, made from the same powder metal with four lobes. The clearance between the rotors is critical for oil pressure. A worn inner rotor can cause low oil pressure in the oil pan and oil pump assembly.
The inner rotor shaft is a hardened steel shaft that drives the inner rotor. One shaft is supplied, made from case‑hardened 20CrMo steel. The shaft has a keyway to connect to the oil pump drive gear. It rotates on a bushing inside the pump cover. In the oil pan and oil pump kit, the shaft transfers torque from the engine to the rotor set.
The screw is a small fastener used to secure the oil pump cover or other components. One screw is supplied, made from zinc‑plated steel with a cross‑recess drive. The screw has a thread size of M5 and a length of 11mm. It is torqued to 6 Nm. This screw is part of the oil pan and oil pump assembly.
The engine oil pump cover is a cast aluminum housing that encloses the rotors. One cover is supplied, machined with bearing surfaces for the inner rotor shaft. The cover has an O‑ring groove and mounting holes for the six M6 bolts. It also contains the pressure relief valve. A worn cover can cause oil leaks in the oil pan and oil pump system.
The O-ring 22X2-FPM70-Q/ZZ 11066 is a rubber seal that seals the oil pump cover to the pump body. One O‑ring is supplied, made from FPM rubber (Viton) with a durometer of 70 Shore A. It has an inner diameter of 22mm and a cross‑section of 2mm. This O‑ring prevents oil from leaking out of the oil pan and oil pump assembly.
The hexagon bolt with flange Q186 – M6X20 – 10.9 – MAN183 – B1 is a high‑strength fastener used to secure the oil pump cover. Nine bolts are supplied, each with a property class of 10.9, a thread size of M6x1.0, and a length of 20mm. The flange head distributes clamping load. These bolts are torqued to 10 Nm. They are essential for the oil pan and oil pump assembly.
The oil suction pipe assembly is a metal tube that draws oil from the bottom of the oil pan. One assembly is supplied, made from steel with a mesh strainer at the inlet. The pipe is bent to reach the lowest point of the oil pan. It connects to the oil pump inlet via a flange and O‑ring seal. This component is critical for the oil pan and oil pump system.
The TORIC SEAL 28X3 B-FKM 1-80 is an O‑ring that seals the oil suction pipe to the oil pump body. One seal is supplied, made from FKM rubber with a durometer of 80 Shore A. It has an inner diameter of 28mm and a cross‑section of 3mm. This seal prevents air from being sucked into the oil pan and oil pump assembly.
The hexagon bolt with flange Q186 – M8X16 – 10.9 – MAN183 – B1 is a short M8 bolt used to secure the oil suction pipe bracket. Two bolts are supplied, each with a thread size of M8x1.25 and a length of 16mm. They are torqued to 25 Nm. These bolts are part of the oil pan and oil pump hardware set.
The oil pan assembly is the stamped steel reservoir that holds the engine oil. One assembly is supplied, made from 3mm thick steel with a corrosion‑resistant coating. It has a capacity of 12 liters and includes a magnetic drain plug. The oil pan assembly is bolted to the engine block with 18 M8 bolts. This is a major component of the oil pan and oil pump kit.
The oil pan sealing gasket is a rubber or silicone gasket that seals the oil pan to the engine block. One gasket is supplied, pre‑formed to match the oil pan flange. It has 22 bolt holes and is made from high‑temperature FPM rubber. This gasket prevents oil leaks from the oil pan and oil pump assembly.
The hexagon bolt with flange Q186 – M8X50 – 10.9 – MAN183 – B1 is a long M8 bolt used to secure the oil pan to the engine block. Eighteen bolts are supplied, each with a thread size of M8x1.25 and a length of 50mm. They are torqued to 25 Nm in a crossing pattern. These bolts are essential for the oil pan and oil pump assembly.
The oil pan block set is a collection of spacers or brackets that support the oil pan and oil pump components. One set is supplied, including the necessary hardware to mount the oil suction pipe and baffles. This set ensures proper alignment of the oil pan and oil pump system.
Oil pan and oil pump – genuine HOWO lubrication system kit
| Material Encoding | Name |
|---|---|
| 200V05104-0251 | Outer rotor of engine oil pump |
| 200V05104-0234 | Rotor in engine oil pump |
| 200V05105-5000 | Inner rotor shaft |
| MQ6-02191-0511 | Screw |
| 200V05103-5036 | Engine oil pump cover |
| MQ6-56936-1150 | O-ring 22X2-FPM70-Q/ZZ 11066 |
| MQ6-03216-8204 | Hexagon bolt with flange Q186 – M6X20 – 10.9 – MAN183 – B1 |
| 200V05701-6055 | Oil suction pipe assembly |
| MQ6-56333-3363 | TORIC SEAL 28X3 B-FKM 1-80 |
| MQ6-03216-8303 | Hexagon bolt with flange Q186 – M8X16 – 10.9 – MAN183 – B1 |
| 201V05800-6370 | Oil pan assembly |
| 202V05904-0212 | Oil pan sealing gasket |
| MQ6-03216-8310 | Hexagon bolt with flange Q186 – M8X50 – 10.9 – MAN183 – B1 |
| 200V05840-6008 | Oil pan block set |
This oil pan and oil pump kit includes every component from the rotors to the pan gasket and all fasteners. No need to source separate parts. Everything is matched for the MC13 engine. For a full engine rebuild, also check our cylinder head assembly kit.
All bolts are grade 10.9 with MAN183 quality mark. They provide secure clamping that resists loosening under engine vibration, ensuring the oil pan and oil pump stay sealed.
The outer and inner rotors are powder metal with hardened surfaces. The clearance is precisely controlled to deliver consistent oil pressure across all engine speeds. Combine with our air compressor kit for complete engine service.
All O‑rings and gaskets are made from FPM (Viton) rubber that resists oil and high temperatures up to 200°C. The oil pan and oil pump assembly will not leak even under extreme conditions.
The oil pump, driven by the engine, draws oil from the oil pan through the suction pipe. The outer and inner rotors create a vacuum that pulls oil past the strainer. The oil is then pressurized and sent to the engine’s oil galleries. Excess oil returns to the oil pan by gravity. The oil pan also acts as a heat sink, cooling the oil. The oil pan sealing gasket prevents leaks, while the oil pan block set holds internal baffles. A properly functioning oil pan and oil pump system is essential for engine longevity. For related components, see our connecting rod assembly page.
Begin by draining the oil and removing the old oil pan. Install the oil pump cover with the outer and inner rotors and the inner rotor shaft. Use the M6 flange bolts torqued to 10 Nm. Install the O‑rings on the pump body and suction pipe. Attach the oil suction pipe with the M8x16 bolts (25 Nm). Install the oil pan gasket on the engine block. Position the oil pan and hand‑tighten the 18 M8x50 bolts, then torque to 25 Nm in a crossing pattern. Install the drain plug with its composite washer (not in this kit, but standard). Refill with oil and check for leaks.
This oil pan and oil pump kit is designed for the MC13 engine used in the HOWO MAX 4X2 tractor. It fits all production years from 2018 onward. The oil pump rotor set has the correct displacement for the 13‑liter engine. The oil pan capacity is 12 liters. The bolt patterns match the original. Always verify your engine serial number before ordering. You may also need our fuel coarse filter kit for complete engine maintenance.
Inspect the oil pan for dents at every oil change. Check the oil pump cover for leaks. The O‑rings should be replaced whenever the oil pump is opened. The rotor clearance should be measured every 500,000 km; if it exceeds 0.2mm, replace the rotor set. The suction pipe strainer should be cleaned if clogged. Always use genuine HOWO parts for any repairs to the oil pan and oil pump system.
If oil pressure is low, check the oil pump rotors for wear. If the oil pressure is erratic, inspect the O‑rings on the suction pipe. A leak at the oil pan flange indicates a damaged gasket or loose bolts. If the engine makes a knocking noise, the oil pan may be dented and restricting oil pickup. Always use genuine HOWO components for replacement. A failing oil pump can cause catastrophic engine damage. For expert advice, refer to our technical guides.
Aftermarket oil pumps often use rotors with incorrect clearances, causing low oil pressure. The fasteners may be lower grade, leading to loosening. Generic gaskets may not withstand engine heat, causing leaks. Genuine HOWO oil pan and oil pump components are manufactured to the exact specifications of the original MC13 engine, using certified materials and rigorous quality control. The small additional cost is far outweighed by the risk of engine failure from oil starvation.
The oil pan and oil pump kit is shipped in a reinforced cardboard box with foam dividers. The fasteners are in sealed poly bags. The packaging is recyclable. The manufacturing facility is ISO 14001 certified. No hazardous substances are used.
This oil pan and oil pump kit includes all 14 line items listed in the parameters table. Individual components can be ordered separately using their material encodings. Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of three or more complete kits, volume discounts are available. Always provide your engine serial number to confirm compatibility.
Fleet managers who have installed this genuine HOWO oil pan and oil pump kit report consistent oil pressure and no leaks. The rotor set fit perfectly, and the FPM O‑rings have not hardened. The oil pan gasket sealed without sealant. Many operators have standardized on this kit for all MC13 engine overhauls, citing the complete all‑in‑one nature and the reliability of genuine components.
The oil pan is shipped separately due to its size. Store the kit in a dry indoor area. Do not remove the protective oil from the rotors until installation. The shelf life is three years when stored properly. Protect the oil pan from impact that could dent the flange.
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