Matched Grade Set — Crankshaft, rods, pistons, bearings, and valve train verified as one tolerance-consistent V3307 engine overhaul kit before dispatch.
Technical Specifications
| Parameter |
Value |
| Product Type |
Overhaul Kit |
| Engine Fitment |
V3307, V3307T, V3307-DI, V3307-DI-TE3, V3307-CR-TE4-SL2-Q (Tier 4), V3307-CR-TE4-SL2 |
| Machine Fitment |
Kubota KX080-3, KX080-4, SSV75, SSV75C, SSV75P, SSV75PC, M6040, M6060, M7060; Bobcat S630, S650, T650 |
| Kit Contents |
Crankshaft, 4x Connecting Rods, Gasket Kit, Cylinder Liners (semi-finished), Piston Set (STD), Piston Pin Set, Snap Ring Set, Rod Bushing Set, Piston Ring Set (STD), Main Bearing Set (STD), Rod Bearing Set (STD), Thrust Washer Set (STD), Intake/Exhaust Valve Set, Valve Guide Set, Valve Seat Set |
| Crankshaft Material |
Alloy steel (SAE 4340 equivalent) |
| Crankshaft Runout |
≤0.03 mm |
| Connecting Rod Tolerance |
±0.005 mm |
| Bearing Composition |
Tri-metal (steel backing, copper-lead overlay, indium-tin top layer) |
| Bearing Clearance (Rod Big-End) |
0.02–0.05 mm |
| Cylinder Liner Condition |
Semi-finished (final honing required) |
| Cylinder Liner Roundness Deviation |
≤0.02 mm |
| Oversize Grade |
STD (standard) |
| Piston Size |
Standard |
| Piston Ring Size |
Standard |
| Condition |
New Aftermarket |
| Standard |
ISO 9001 |
| Warranty |
3–12 months against manufacturing defects |
Application Suitability
| Engine System |
Related Components |
| Cylinder and crankcase |
Crankshaft, connecting rods, main bearings, rod bearings, thrust washers |
| Piston assembly |
Pistons, piston pins, snap rings, piston rings, rod bushings |
| Cylinder bore |
Semi-finished cylinder liners requiring final honing to bore geometry |
| Valve train |
Intake and exhaust valves, valve guides, valve seats |
| Sealing |
Full gasket kit covering head, manifold, and accessory interfaces |
Why Overhaul Kits Fail Before the Engine Does
Most rebuild failures trace back to mismatched component grades, not individual part quality.
Rebuild shops discover partway through teardown that the previous overhaul left the block bored to an intermediate size, yet the replacement kit arrived with standard pistons and rings. The V3307 engine overhaul kit solves this by shipping every rotating, reciprocating, and sealing component as one tolerance-verified set. When piston-to-bore clearance, rod bearing clearance, and crankshaft journal dimensions are checked against the same build sheet, assembly proceeds without the mid-job parts chase that extends downtime [NEED_CITE: engine rebuild component matching procedures for diesel engines].
In workshops I have visited across Latin America, a recurring pattern emerges: pistons sourced from one supplier, cylinder liners from another, and bearings from a third. Each shipment meets its own spec sheet, but the stack-up of small deviations across mating surfaces produces ring slot gap anomalies or bearing clearance drift. With this V3307 rebuild kit with crankshaft, every dimensional relationship is confirmed at the kit level before it reaches the bench.
System-Level Supply for the V3307 Family
This V3307 engine overhaul kit addresses the entire bottom-end and top-end system in a single consignment. The crankshaft, four connecting rods, piston sets, and bearing shells are matched so that journal size, rod big-end bore, and bearing shell thickness produce the correct oil film clearance without selective assembly. The valve train set — valves, guides, and seats — covers the top-end rebuild that typically accompanies a bottom-end overhaul on engines with accumulated service hours.
Emission Tier Variants and Dimensional History
The V3307 family spans naturally aspirated, turbocharged, direct-injection, and Tier 4 common-rail variants. Internal components differ across these tiers in piston crown profile, ring pack configuration, and valve seat material. Confirming the exact engine serial variant before dispatch prevents the situation where a Tier 4 piston is installed in a DI block, or where valve seat metallurgy does not match the combustion temperature of the target variant. Additionally, if the block or crankshaft has been machined during a prior rebuild, standard-size components in this kit will not produce correct clearances — oversize verification is essential before the kit ships [NEED_CITE: diesel engine oversize grade identification after prior machining].
What the Specification Numbers Mean at the Bench
The alloy steel crankshaft (SAE 4340 equivalent) is selected for fatigue strength under the cyclic loading that compact excavators and skid steers impose through frequent direction reversals and hydraulic stall events. A crankshaft runout held to ≤0.03 mm means main bearing wear remains even across all journals, preventing the localized overheating that causes bearing spin. Connecting rod dimensional tolerance of ±0.005 mm ensures that all four cylinders share load symmetrically — a deviation beyond this range on any single rod concentrates combustion force on its bearing shell. The tri-metal bearing composition provides embeddability for microscopic contaminants that circulate in engines with many service hours, while the indium-tin top layer supports boundary lubrication during cold starts before full oil pressure builds.
The Cost of a Kit That Is Almost Complete
An overhaul kit missing one valve seat set or one grade of thrust washer forces the engine to sit partially assembled while the missing item is sourced. In a busy rebuild shop, that bench space is occupied and the machine owner is still without equipment. When pistons, rings, and bearings arrive in mismatched tolerance grades from separate orders, the assembler must either re-machine to compensate or return components — both paths add unplanned days. A V3307 engine overhaul kit verified line-by-line against the build sheet eliminates the second order entirely [NEED_CITE: cost impact of incomplete overhaul kits on rebuild shop throughput].
How This Kit Reaches Your Bench Correctly
Production on selected kit lines and qualified sourcing for the remainder means every component in this V3307 rebuild kit with crankshaft carries the same warranty terms under one account. Engine system components spanning eight categories — from gasket sets to complete long blocks — consolidate under a single order reference. Identification works from an engine serial plate photograph when the data tag is illegible. Cross-reference verification covers superseded and alternate part numbers so that older V3307 variants are matched accurately. A sample kit can be supplied for fitment confirmation before a bulk commitment is made, and the technical team confirms grade and variant compatibility against your engine build data.
Documentation & Verification
- Commercial invoice listing every kit line item with quantity and oversize grade
- Compatibility sheet mapping kit contents to specific V3307 serial variant (reference only)
- Dimensional inspection records covering crankshaft runout, rod tolerance, and bearing clearance
- Warranty terms stating coverage period and defect resolution process
- Packing photographs showing kit contents verified against build sheet before crating
- HS code and customs documentation support for international consignments
Installation & Rebuild Sequence
- Verify block bore and crankshaft journal sizes against standard or oversize requirement before opening the kit
- Hone semi-finished cylinder liners to match actual bore geometry measured during teardown
- Assemble matched piston-to-rod pairs using included piston pins and snap rings
- Confirm rod big-end bearing clearance falls within specified range after torqueing caps
- Install valve train set — guides, seats, valves — following seat cutting to match new valve angles
- Follow initial break-in procedure to seat piston rings and verify oil pressure stability
Requesting the Correct Kit Variant
Provide the engine serial number, emission tier designation, and any known machining history from prior rebuilds. If the data plate is missing, a photograph of the block casting number and cylinder head casting number allows variant identification. State whether the crankshaft and block remain at standard dimensions or have been machined to an oversize grade, so the correct V3307 engine overhaul kit variant ships from stock.
Frequently Asked Questions
Q: What is included in this V3307 overhaul kit and are any items excluded?
A: The kit contains crankshaft, four connecting rods, pistons, piston pins, snap rings, piston rings, cylinder liners (semi-finished), rod bushings, main and rod bearing sets, thrust washers, intake and exhaust valves, valve guides, valve seats, and a full gasket kit. Items not included are the oil pump, water pump, turbocharger, injectors, and external accessories. Confirm whether your build requires additional components.
Q: My V3307 was previously rebuilt — how do I confirm whether I need standard or oversize?
A: Measure the cylinder bore diameter and crankshaft journal diameters during teardown. If either has been machined beyond factory nominal, oversize pistons, rings, and bearings are required. Ordering standard components for a block that has been previously bored will produce excessive clearance and early failure. Provide measured values or prior machining records so the correct grade ships.
Q: Do different V3307 emission variants use the same internal parts?
A: No. Piston crown geometry, ring pack configuration, and valve seat material differ between naturally aspirated, turbocharged, DI, TE3, and Tier 4 common-rail variants. Installing components from one tier in another can cause combustion chamber mismatch or accelerated valve wear. Supply the full engine serial number to confirm the correct variant is included in your kit.
Q: What caused the original crankshaft or rod failure — and does this kit address the root cause?
A: Common root causes include oil starvation from clogged galleries, bearing contamination, overloading from hydraulic circuit faults, or cooling system degradation. This V3307 engine overhaul kit replaces the failed rotating and reciprocating assembly but does not correct external system faults. Diagnose lubrication and cooling circuits during teardown to prevent recurrence after rebuild.
