Oil Pump 16851-35012 | Matched Set for Kubota D722 D902 Rebuild

Matched Set Shipped — Oil pump, gaskets, and adjacent lubrication components consolidated for Kubota D722 and D902 engine rebuilds.

Technical Specifications

Application Suitability

Why Oil Pressure Drops Return After a Pump Swap

The failed pump is usually the symptom, not the root cause.

When a Kubota D722 oil pump is replaced without addressing blocked galleries, worn main bearings, or a fatigued relief valve spring, the new unit inherits the same contaminated or restricted flow environment. Rebuild shops routinely see low oil pressure return within operating hours because the underlying lubrication fault was never resolved [NEED_CITE: root cause analysis for recurring low oil pressure in small diesel engines]. Supplying the oil pump alongside matched gaskets, a fresh filter, and verified bearing clearances means the system is addressed as a whole, not one component at a time. An overhaul kit that omits the oil pump mounting gasket or ships a pump mismatched to the engine serial variant turns a planned rebuild into a second teardown with additional freight and labor costs.

Positioning the Oil Pump Within the D722/D902 Lubrication System

The oil pump drives the entire lubrication circuit in the D722 and D902 engines, feeding pressurized oil through galleries to the main bearings, camshaft journals, and valve train. During a full engine overhaul, this oil pump should be evaluated alongside the oil filter element, cooler matrix, and all gallery sealing gaskets. Replacing the pump in isolation while reusing hardened gaskets or a clogged filter reintroduces flow restriction from the first start-up. Our supply approach treats the lubrication circuit as a single system — the pump, its mounting hardware, and adjacent sealing surfaces ship as a matched set so the rebuild is complete before the engine is buttoned up.

Cross-Reference Chain and Engine Serial Variants

The part number lineage — 16851-35010 through 16851-35012 to 16851-35014 — reflects production revisions across the D722 and D902 engine families [NEED_CITE: Kubota D722 D902 engine serial range and lubrication passage revisions]. Internal oil gallery routing and pump mounting patterns shifted across production runs, meaning a pump cast for an early D722 may physically bolt on but fail to align with later gallery port positions. Before committing to bulk quantities, confirming the engine serial number against the applicable cross-reference number prevents receiving a dimensionally similar but functionally incompatible unit. We verify each cross-reference in the chain against the specific engine build so the correct variant ships.

Reading the Specifications That Matter for Rebuild Integrity

The high-grade iron housing provides dimensional stability under the thermal cycling typical of compact diesel engines — resisting the bore distortion that causes gear tip clearance to open up and internal leakage to increase over operating hours. Gear mesh tolerance within the pump housing directly determines volumetric efficiency at idle speed, which is where oil pressure problems first surface during a post-rebuild break-in. The mating surface finish between pump body and engine block must hold a reliable seal without relying solely on gasket compression, since over-torqued mounting bolts can distort the housing and create internal bypass paths. Each oil pump for engine rebuild applications undergoes dimensional verification on these interfaces before dispatch.

The Hidden Cost of Ignoring System-Level Faults

Installing a new oil pump without flushing galleries or inspecting bearing shells frequently results in premature pump wear from residual metallic debris circulating through the system. A scored crankshaft journal that was not addressed during the previous rebuild will continue to bleed oil pressure regardless of pump condition, leading the technician to suspect a defective replacement part. Rebuild shops that skip system-level diagnosis before parts commitment end up processing warranty claims on components that were never the actual failure point [NEED_CITE: lubrication system fault diagnosis methodology for diesel engine rebuild]. Matching the replacement to the documented fault prevents repeat teardowns.

Why Source This Oil Pump Through Our Engine Systems Desk

Production on selected lubrication lines combined with qualified sourced supply under one account and one warranty means the pump, its gasket, and the associated filter element carry identical quality terms. Eight product categories allow a complete engine overhaul list — from piston rings to seal kits to diagnostic tools — to ship as a single consignment rather than split across multiple suppliers. Minimum order from one piece supports urgent single-engine rebuilds without forcing surplus stock. Part identification from engine serial number, a photograph of the old pump, or a nameplate image resolves uncertainty before purchase. Cross-reference verification covers the full superseded number chain from 15841-35010 through 16851-35014, catching errors that copied reference tables carry forward. Technical support is available for compatibility and grade confirmation specific to your engine build.

Documentation & Verification

• Commercial invoice listing oil pump part number with cross-reference chain noted as reference only
• Dimensional inspection record covering gear tip clearance and housing bore measurements
• Part compatibility sheet mapping 16851-35012 to confirmed D722/D902 engine serial ranges
• Packing photographs showing pump protection and gasket separation before crating
• Warranty terms document covering manufacturing defects for the stated warranty period
• HS code classification and customs documentation prepared for international lubrication parts shipments

Installation & Rebuild Sequence

• Verify engine block mating surface is flat and free of old gasket residue before positioning the oil pump
• Prime the pump cavity with clean engine oil before first cranking to prevent dry-start gear scoring
• Torque mounting bolts to engine manual specification in sequence to avoid housing distortion
• Confirm oil pressure at idle and rated speed against Kubota D722/D902 service manual values
• Run initial break-in at varied load to seat gear surfaces and verify gallery flow throughout the system
• Inspect oil filter element after first operating cycle for metallic debris indicating residual system contamination

Request a Matched Lubrication Set Quote

Provide your engine model, serial number, and any previous rebuild history so we can confirm the correct cross-reference variant and identify which gasket set matches your specific build. Include photographs of the old pump and nameplate if serial numbers are unclear. We will return a consolidated quotation covering the oil pump, matched seals, and any adjacent lubrication components your overhaul requires.

Frequently Asked Questions

Q: What else should be replaced when the oil pump fails on a D722 or D902? A: The oil filter element, pump mounting gasket, and gallery sealing rings should always be replaced as a matched set. Main and conrod bearing shells should be inspected for scoring that indicates contaminated oil circulated before the pump failed. Reusing old gaskets or a saturated filter with a new pump reintroduces the restriction or contamination that caused the original failure.

Q: How do I know which cross-reference number applies to my engine serial? A: The chain from 15841-35010 through 16851-35012 to 16851-35014 corresponds to different D722 and D902 production runs with internal lubrication passage revisions. Providing your engine serial number allows us to confirm which cross-reference variant matches your gallery port positions and mounting pattern, preventing receipt of a dimensionally similar but incompatible unit.

Q: Does the overhaul gasket kit include the oil pump mounting gasket? A: Not all overhaul kits include the oil pump gasket — some kits stop at the cylinder head and omit lower-end sealing items. We verify your specific engine build against the kit contents and supply the pump gasket separately if the standard set excludes it, ensuring no second order is needed mid-rebuild.

Q: Could low oil pressure be caused by something other than the pump? A: Worn main bearings, blocked oil galleries, a fatigued relief valve spring, or excessive crankshaft journal clearance all produce low oil pressure independent of pump condition. System-level diagnosis before parts commitment prevents replacing a functional pump while the actual fault remains unresolved, avoiding repeat teardowns and unnecessary component costs.

Q: Can I get the pump, gaskets, and oil filter together in one shipment? A: Yes. The oil pump, matched mounting gasket, oil filter element, and any adjacent lubrication seals ship as a consolidated set from our Guangzhou warehouse under one account and one warranty. This eliminates split freight and mismatched arrival times that delay engine reassembly when components are sourced from separate suppliers.