System-matched supply — oversize grades confirmed against your crankshaft regrind history before the Con Rod Bearing for Kubota D1803 engine rebuild kit ships.
Technical Specifications
| Parameter |
Value |
| Part Number |
17311-22310 17311-22312 |
| Product Type |
Con Rod Bearing |
| Cross-Reference |
17311-22310, 17311-22312 (reference only) |
| Machine Fitment |
Kubota KX033-4, KX040-4, KX121-2, KX121-3, U35-4, U48-5, L3240, L4740, M5140, Hyundai HDF15-5, HSL650-7 |
| Material |
High-tin aluminum alloy with copper-lead overlay, steel-backed |
| Oversize Grades |
available in STD, 0.25 and 0.50 oversize |
| Surface Roughness |
Ra 0.2–0.4 μm |
| Peak Combustion Pressure |
up to 130 bar |
| Condition |
New Aftermarket |
| Standards |
ISO 9001, ISO 4380, SAE J300 |
Application Suitability
| Engine System |
Related Components |
| Bottom-End Rotating Assembly |
Main bearings, thrust washers, crankshaft seals |
| Lubrication Circuit |
Oil pump, oil filter, oil cooler gaskets |
| Cylinder Block Overhaul |
Piston rings, cylinder liners, overhaul gasket set |
| Cooling & Emission |
Water pump seal, thermostat, exhaust manifold gasket |
Why Rebuilds Fail Within the First Hundred Hours
A Con Rod Bearing for Kubota D1803 engine rebuild that ignores the root cause of the original failure is simply a countdown to the next seizure.
When a connecting rod bearing spins or scores prematurely, the damage rarely stops at the shell itself. Oil contamination from a degraded filter bypass, crankshaft journal taper from previous overheating, or a weakening oil pump all leave signatures that the next set of bearings will inherit. Rebuild shops that swap shells without measuring journal condition or checking oil pressure at the gallery are repeating a cycle. [NEED_CITE: root cause analysis methodology for diesel engine bearing failure]
The Rotating Assembly as a Matched System
Installing a fresh Con Rod Bearing for Kubota D1803 engine rebuild set without verifying main bearing clearance and thrust washer thickness invites imbalance across the bottom end. The crankshaft does not float on one journal in isolation; load distribution shifts when adjacent bearings sit at different clearance grades. Rebuild sequencing demands that con rod shells, main bearings, and thrust washers are selected as a coherent set after all journals are micrometred.
Oversize Grades and Prior Rebuild History
Every time a crankshaft goes to the grinder, the next bearing set must step up in oversize. A workshop that installs standard-grade shells on a crank already cut to 0.25 will see excessive oil clearance, low oil pressure at idle, and accelerated wear. This kit is available in STD, 0.25 and 0.50 oversize to match the actual journal diameter on the bench. Cross-reference verification covering 17311-22310 and 17311-22312 ensures the correct shell profile reaches the engine. [NEED_CITE: crankshaft journal regrind standards and bearing oversize selection]
Reading the Specs That Matter on the Bench
The high-tin aluminum alloy with copper-lead overlay provides a conformable surface that embeds minor contaminants rather than scoring the journal. Steel backing delivers the interference fit needed to keep the shell seated under peak combustion loads up to 130 bar. Surface roughness in the Ra 0.2–0.4 μm range supports hydrodynamic oil film formation during the critical first seconds after startup, before full pressure builds across the gallery.
What Happens When the Grade Is Wrong
The Cost of Skipping the Micrometer
Installing standard shells on a reground journal means oil drains past the bearing faster than the pump can replenish it. The result is metal-on-metal contact under load, visible as copper showing through the aluminum overlay within the first oil sample. Downtime compounds when the engine must be torn down again to diagnose what a ten-minute measurement would have prevented. [NEED_CITE: oil clearance effects on hydrodynamic bearing load capacity]
Why Rebuild Shops Source This Kit Here
Own production lines and qualified sourced supply carry the same quality control and warranty terms, so a matched overhaul kit ships from one account. Eight product categories mean the con rod bearings, main bearings, gasket set, and oil pump all consolidate into one consignment. Minimum order from one set supports emergency teardowns without waiting to fill a pallet. Guangzhou warehouse stock on common grades enables fast dispatch when a machine is already apart on the bench. Part identification from engine serial prefix, photograph, or nameplate image eliminates guesswork on variant differences between D1803, D1803MDI, and D1803-CR builds.
Documentation & Verification
- Commercial invoice listing each bearing grade and oversize separately for customs and rebuild records
- Cross-reference sheet mapping 17311-22310 and 17311-22312 to engine serial ranges (reference only)
- Dimensional inspection record covering shell crush height, wall thickness, and oil groove width
- Warranty terms covering manufacturing defects for six months from dispatch date
- Packing photographs showing anti-rust oil coating and sealed box condition before crate closure
- HS code and customs documentation support for international engine parts consignments
Installation & Rebuild Sequence
- Measure all crankshaft journals before selecting oversize grade for this Con Rod Bearing kit
- Verify oil groove orientation matches the lubrication drill pattern in the connecting rod big end
- Confirm shell crush height with plastigauge before torquing cap bolts to specification
- Prime the lubrication system and check oil pressure at the gallery before applying load
Before You Request a Quote
Provide the engine serial prefix and any prior crankshaft regrind records so the correct oversize grade is confirmed before dispatch. Share the full overhaul requirement — main bearings, gasket set, oil pump — to receive a matched kit quotation.
Frequently Asked Questions
Q: What oversize grade do I need if the crankshaft has been reground?
A: Measure each crankshaft journal with a micrometer and compare against the standard diameter. If the journal has been cut undersize during a previous rebuild, you must select the corresponding oversize bearing shell — typically 0.25 or 0.50 — to restore correct oil clearance.
Q: Does the overhaul kit include main bearings and thrust washers?
A: This listing covers the connecting rod bearing set. Main bearings and thrust washers are available as separate line items and should be ordered together so the entire bottom end is matched to the measured journal condition.
Q: Are con rod bearings the same across D1803, D1803MDI, and D1803-CR variants?
A: Shell dimensions and oil groove configuration can differ between these engine builds. Provide the exact engine serial prefix so the correct variant is confirmed before the Con Rod Bearing for Kubota D1803 engine rebuild kit ships.
Q: What caused the original bearings to fail?
A: Common causes include oil contamination from a failed filter, oil pump degradation reducing gallery pressure, or crankshaft journal scoring from a previous overheating event. Diagnose the root cause before installing the replacement set.
