Meticulously Manufactured Top-quality Sturdy Oil Pump (21340-42106)

The 21340-42106 engine oil pump is engineered for commercial diesel vehicles operating in construction and delivery fleets. It is produced to match Mobis OEM specifications and holds ISO/TS16949 automotive quality certification, with automated optical inspection implemented at every critical manufacturing stage to maintain a 50ppm defect rate. This pump serves as a replacement for original equipment in Hyundai and Kia diesel engine lubrication systems, addressing common faults in aging commercial vehicles.

21340-42106 Engine Oil Pump Specifications

Core Design Features of the 21340-42106 Oil Pump

OEM-aligned Casting for Direct Installation

The pump housing and internal components are cast to 1:1 OEM dimensions, with mounting holes, gear tooth parameters, oil passage layout and sealing surfaces consistent with the original pump. No cutting, grinding or additional gaskets are required for installation, allowing compatible fit with commercial diesel engine blocks.

Gear Rotor Design for Steady Oil Pressure

Precision clearance control between gear rotors maintains consistent lubricant pressure at both idle and full load conditions. The pump delivers continuous oil supply to crankshaft, camshaft and timing components, reducing the risk of dry friction and cylinder scoring during fleet operation.

One-piece Die-cast Aluminum Housing

The single-piece cast structure reduces potential oil leakage points, and supports heat dissipation to stabilize diesel oil temperature under heavy load. The pressure casting process avoids sand holes or shrinkage porosity, which can cause oil seepage in multi-piece aftermarket designs.

Hardened Drive Gear and Integrated Safety Valve

Gear surfaces receive high-frequency quenching treatment to achieve high surface hardness, resisting abrasion and tooth jumping during long-term high-rev operation. A built-in pressure relief valve automatically adjusts oil pressure, preventing excessive pressure during cold start or high RPM operation, and protecting engine seals and pipelines from overpressure damage. The fluorine rubber main oil seal fits tightly with the crankshaft journal, and can withstand continuous operating temperatures of 150°C.

Compatible Engines and Vehicle Models for 21340-42106 Oil Pump

This oil pump fits Hyundai and Kia D4BF / D4BH 2.5L diesel engines (4D56 series). Applicable vehicle models include H100, Starex, Porter, Galloper, Terracan, Bongo, Pregio and Besta, covering model years from 1993 to 2008 for MPV and minivan vehicle classes. Replacing an aging original pump with this unit can resolve low oil pressure alarms, abnormal engine knocking, power drop and premature internal component wear, avoiding costly full engine overhaul. With stress relief treatment to eliminate internal casting stress, the pump delivers stable dimensional performance under frequent start-stop and heavy load driving, with a normal service life of 80,000–120,000 km under regular maintenance conditions.

FAQ for 21340-42106 Engine Oil Pump

What causes the low oil pressure warning light on commercial diesel vehicles?

Common root causes include worn internal pump gears or rotors from long-term use, sludge contamination or insufficient oil maintenance, a stuck-open pressure relief valve caused by carbon sludge and metal debris, a blocked oil suction strainer on the pump inlet, excessive wear of crankshaft main bearings, or a damaged oil pump housing with internal oil bypass leakage. Diagnosis can be performed with a mechanical oil pressure gauge: hot idle pressure below 1.0 bar (14.5 psi) and slow pressure rise at high RPM indicate this fault. If the warning light activates, stop engine operation immediately to avoid seized crankshaft and total engine damage.

How to address front engine oil leakage from the crankshaft seal area?

This leakage is usually caused by aged and hardened front crankshaft oil seal built into the pump housing, scored or worn crankshaft sealing journal surface, improper pump installation causing seal lip distortion, or excessive crankshaft end play. To resolve the issue, remove the timing belt, crankshaft pulley and oil pump assembly for inspection. For a smooth journal surface, replace only the built-in oil seal of the pump. For a grooved or scratched journal, replace the crankshaft or install the complete new oil pump assembly. Lubricate the new seal lip with clean engine oil before installation, tighten mounting bolts in cross sequence to 22–26 N·m, then refill engine oil and verify no leakage after startup.

Can a cracked oil pump housing be repaired?

Cracked aluminum oil pump housings cannot be reliably welded or sealed, as cracks may expand under operating pressure and cause sudden oil pressure drop. Directly replace the complete 21340-42106 oil pump assembly, clean all engine mating surfaces and install a brand-new gasket together with the new unit.

This product supports minimum order quantities of 500-1000 units. Packaging options include genuine (MOBIS) standard packaging, as well as aftermarket options such as neutral packaging and brand packaging to fit different commercial procurement needs.