Matched Set Dispatch — Every connecting rod leaves our Guangzhou warehouse with bearings and piston assemblies verified against the same engine serial variant.
Technical Specifications
| Parameter |
Value |
| Part Number |
17311-22010 |
| Product Type |
Connecting Rod |
| Cross-Reference |
17311-22012, 17331-22010, 17311-22013 (reference only) |
| Machine Fitment |
Kubota KX121-2, KX121-3, KX161-2, KX161-3, KX91-3, U35, U45S, R420, R510, L2250, L2800, L3010, L3400, M4030, M4900, M5400, MX5000 series |
| Condition |
New Aftermarket |
| Warranty |
3-12 months against manufacturing defects |
| Certification |
ISO manufacturing standards |
| Applications |
Excavator engine rebuild, generator set maintenance, agricultural tractor overhaul, loader engine repair, air compressor engine service |
Application Suitability
| Engine System |
Related Components |
| Block & Internal Parts |
Con rod bearings (STD/oversize), piston assemblies, piston pins |
| Cylinder Components |
Cylinder liners, head gaskets, valve stem seals |
| Lubrication System |
Oil pump, main bearings, crankshaft thrust washers |
| Fuel System |
Injection nozzles, fuel filters, delivery valves |
| Emission & Exhaust |
Turbocharger (V2003-T), exhaust manifold gaskets |
Why Connecting Rods Fail Before the Next Overhaul Interval
A replacement connecting rod fails early when the root cause of the first failure is ignored.
In repair shops across the Pearl River Delta, I regularly see Kubota V-series engines come back with spun bearings and damaged journals because the shop replaced the rod without diagnosing oil starvation or verifying crankshaft condition. The connecting rod is often the victim, not the culprit. An engine rebuild that swaps the rotating assembly but ignores the lubrication circuit will see repeat Connecting Rod engine rebuild failures within weeks [NEED_CITE: diesel engine lubrication circuit failure modes and bearing collapse]. The cost of a second teardown dwarfs the initial parts bill, and the machine owner loses confidence in the repair facility.
The Rotating Assembly as a Matched System
This connecting rod operates within a tight tolerance chain that includes the crankshaft journal, con rod bearing shells, piston pin, and piston. When one element is out of spec — for example, a crankshaft ground to 0.25 undersize paired with a STD bearing — the oil film collapses and the rod fails. Every Connecting Rod engine rebuild must start with crankshaft measurement before any parts are ordered.
Superseded Numbers and Engine Serial Variants
The reference numbers 17311-22012, 17331-22010, and 17311-22013 all map to the same base connecting rod family, but engine serial breakpoints determine which variant fits. A V2003-T built in one production run may use a different piston pin bore or rod bolt thread than one built six months later. We verify engine serial number against the factory service data before confirming which Connecting Rod engine rebuild variant ships [NEED_CITE: Kubota V-series engine serial variant identification procedures].
Dimensional Integrity and Bearing Grade Selection
The big-end bore, small-end bushing diameter, and center-to-center length must all fall within factory tolerance bands. When a crankshaft has been previously ground to an undersize dimension, matching bearing shells in 0.25, 0.50, or 0.75 undersize are required. Shipping a standard-grade bearing with a reground crankshaft guarantees early failure. Our quality inspection record covers these dimensions so the rebuild shop can match grades before the engine goes back together.
The Cost of Wrong-Grade Bearing Shells
A connecting rod paired with the wrong bearing grade does not fail gracefully. The oil film breaks down, bearing material transfers to the journal, and the crankshaft sustains damage that requires welding and regrinding or full replacement. This cascade turns a single-cylinder repair into a complete bottom-end overhaul, adding days to the machine downtime [NEED_CITE: crankshaft journal damage progression from bearing shell failure].
Why Source the Complete Rebuild Here
We produce selected engine part lines in our own facility and source the remainder from qualified ISO-certified partners, so both self-produced and sourced supply carry identical QC and warranty terms. Eight categories mean the overhaul gasket kit, piston assemblies, bearing shells, and seal kits all ship under one account with one warranty. Our technical team confirms bearing grades and Connecting Rod engine rebuild compatibility against your engine serial number. Guangzhou warehouse stock enables fast dispatch on common V-series components. Sample supply is available for fitment confirmation before bulk commitment on larger fleet overhauls.
Documentation & Verification
- Commercial invoice listing every line item from rod to gasket kit for customs clearance.
- Part compatibility sheet confirming 17311-22010 cross-reference (reference only) and serial variant match.
- Dimensional inspection record covering big-end bore, small-end diameter, and center length.
- Warranty terms stating coverage period and conditions for manufacturing defect claims.
- Packing photographs documenting anti-corrosion treatment and protective packaging before crate seal.
- HS code and customs documentation support for international engine parts shipments.
Installation & Rebuild Sequence
- Clean all oil galleries and verify main bearing cap torque before installing the connecting rod assembly.
- Measure crankshaft journal diameter and select con rod bearing grade to match before assembly.
- Check rod bolt stretch or torque-to-angle per Kubota service specification for this engine variant.
- Verify piston ring end gap and pin fit after mating the piston to the connecting rod.
- Prime the lubrication system and confirm oil pressure at idle before applying load during break-in.
Request the Right Parts for Your Overhaul
Send the engine model, full serial number, and any previous rebuild records so we can confirm bearing grades, piston sizes, and gasket kit contents. If the nameplate is missing or painted over, a photograph of the casting numbers on the block is usually enough. We will return a confirmed parts list with matching dimensions and a consolidated dispatch schedule.
Frequently Asked Questions
Q: What other components should be replaced at the same time as the connecting rod?
A: A proper overhaul replaces con rod bearings, main bearings, piston rings, cylinder liners if worn, and the complete gasket set. Reusing old bearings or gaskets risks contamination and leakage that forces a second teardown. We supply matched overhaul kits so every wear item arrives in one shipment.
Q: How do I determine if my crankshaft has been ground and what bearing grade to order?
A: Measure the crankshaft journal diameter with a micrometer and compare to factory STD specifications. Any undersize reading indicates a previous regrind. Share those measurements with us and we will ship bearing shells in the matching grade — 0.25, 0.50, or 0.75 undersize as required.
Q: Are connecting rods identical across all Kubota V2003-T serial variants?
A: No. Production breakpoints can change piston pin diameter, rod bolt thread pitch, or big-end bore tolerance. We require the engine serial number to confirm the exact variant before shipping. This prevents the common situation where the rod physically fits but operates outside the specified clearance range.
Q: What typically causes the original connecting rod to fail?
A: The most frequent causes are oil starvation from a failing pump or blocked gallery, over-revving beyond the governor limit, or bearing shell collapse from contamination. Identifying and correcting the root cause during the rebuild prevents the replacement rod from suffering the same fate within the first hundred hours.
Q: Can I get a complete overhaul kit with rods, pistons, bearings, and gaskets together?
A: Yes. We consolidate all rotating assembly components, cylinder parts, and seal kits into a single shipment under one account. This eliminates the situation where the rods arrive but the gasket kit is backordered from a different supplier, leaving the engine on the bench waiting for the final pieces.
