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Kubota WSM OC60-E2 - User Manual

Kubota WSM OC60-E2
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OC60-E2,OC95-E2
WORKSHOP MANUAL
DIESEL ENGINE

Table of Contents

Questions and Answers

  • E
    Elizabeth WilliamsAug 16, 2025
    Why Kubota Engine does not start?
    • K
      Kimberly OlsonAug 16, 2025
      Your Kubota Engine might fail to start due to several reasons. It could be due to no fuel, in which case you should replenish fuel. Other causes include air or water in the fuel system (vent air, replace fuel, and repair/replace the fuel system), a clogged fuel pipe or filter (clean or replace), using the incorrect fuel (use specified fuel), a fuel leak (tighten nut), incorrect injection timing (adjust), or worn/malfunctioning components (replace fuel camshaft, injection nozzle, or injection pump). Seizure of engine components, compression leaks, deficient compression, improper valve alignment, incorrect valve timing, or worn piston rings could also be the reason. Adjust excessive valve clearance.
  • M
    Michael MitchellAug 19, 2025
    What to do if Kubota Engine overheated?
    • R
      Robert BlevinsAug 19, 2025
      If your Kubota Engine is overheating, consider these potential causes: insufficient engine oil (replenish), overload running (loosen the load), a defective head gasket (replace), incorrect injection timing (adjust), or using unsuitable fuel (use the specified fuel).
  • C
    Charles BarrettAug 21, 2025
    What to do if Kubota WSM OC60-E2 Engine has either black or dark gray exhaust gas?
    • K
      Kaitlin WongAug 21, 2025
      If your Kubota Engine emits black or dark gray exhaust, it could be due to an overload (lessen load), using low-grade fuel (use the specified fuel), or a clogged fuel or air filter (clean or replace).
  • C
    Cristian BrownAug 25, 2025
    What to do if Kubota WSM OC60-E2 has either white or blue exhaust gas?
    • C
      Christopher OlsonAug 26, 2025
      If your Kubota Engine is emitting white or blue exhaust gas, it could be due to excessive engine oil (reduce to the specified level), worn or stuck piston rings and liner (replace), incorrect injection timing (adjust), or deficient compression (check top clearance and correct valve recessing).
  • S
    scottsydneyAug 27, 2025
    Why Kubota Engine revolution is not smooth?
    • S
      sethwilliamsAug 28, 2025
      Uneven Kubota Engine operation can stem from a clogged or dirty fuel filter (clean), a clogged air cleaner (clean or replace), a fuel leak (tighten nut), a malfunctioning injection pump (replace), incorrect nozzle injection pressure (repair or adjust), a stuck or clogged injection nozzle (replace), a clogged fuel overflow pipe (clean), or a malfunctioning governor (repair).
  • L
    lyncherikaAug 31, 2025
    Why Kubota Engine has low oil pressure?
    • T
      Tara MezaAug 31, 2025
      Low oil pressure in your Kubota Engine can be caused by several factors: insufficient engine oil (replenish), a clogged oil strainer (clean), a relief valve stuck with dirt (clean), a relief valve spring that is weakened or broken (replace), excessive oil clearance of the crankshaft or crank pin bearing (replace), a clogged oil gallery (clean), using different types of oil (use specified type of oil), or a defective oil pump (repair or replace).
  • S
    Sarah JonesSep 2, 2025
    Why Kubota WSM OC60-E2 has deficient output?
    • J
      James RomanSep 3, 2025
      A deficient output in your Kubota Engine could be due to incorrect injection timing (adjust), moving parts showing signs of seizing (repair or replace), deficient nozzle injection (repair nozzle replace), or a compression leak (repair).
  • J
    James PayneSep 5, 2025
    Why Kubota Engine has excessive lubricant oil consumption?
    • T
      Thomas SmithSep 5, 2025
      Excessive lubricant oil consumption in your Kubota Engine can occur if the piston ring's gaps are facing the same direction (shift ring gap direction), the oil ring is worn or stuck (replace), the piston ring groove is worn (replace piston), the valve stem and guide are worn (replace), or there is an oil leak (repair).
  • L
    Larry TerrellSep 9, 2025
    Why Kubota WSM OC60-E2 has fuel mixed into lubricant oil?
    • J
      Jeffrey WilsonSep 9, 2025
      If fuel is mixing into the lubricant oil of your Kubota Engine, it could be due to a broken injection pump (replace pump element or pump).
  • D
    daviddudleySep 12, 2025
    Why Kubota WSM OC60-E2 Engine has high oil pressure?
    • J
      Joe SantiagoSep 12, 2025
      High oil pressure in your Kubota Engine can be attributed to using different types of oil (use the specified type of oil) or a defective relief valve (replace).

Summary

Safety Instructions

Before Servicing and Repairing

Read all instructions and safety instructions before servicing and repairing the engine.

Safety Starting

Precautions for safely starting the engine, avoiding unauthorized modifications.

Safety Working Practices

Guidelines for safe operation, including PPE and handling hot parts.

Fire Prevention

Precautions to prevent fires, including fuel handling and battery safety.

Preventing Acid Burns

Precautions for handling battery electrolyte to prevent acid burns and eye damage.

Specifications

Performance Curves

General Precautions

Lubricants and Fuel

Maintenance Check List

Checking and Maintenance Procedures

Daily Checks

Procedures for daily inspection of engine oil level and fuel hoses.

Lubricating System

Lubricating System General Overview

Overview of the forced lubrication system using a trochoid pump.

Oil Pump Operation

Explanation of the trochoid oil pump mechanism and its operation.

Oil Pressure Switch Warning

Function of the oil pressure switch and warning lamp for low oil pressure.

Cooling System

Cooling System Overview

Description of the combined air-cooled and oil-cooled system.

Fuel System

Fuel System General

Overview of fuel flow from tank to injection pump and nozzle.

Injection Pump Details

Description of the NC Type mini injection pump, plunger, and control rack.

Pump Element Function

Explanation of the pump element, plunger, and cylinder assembly.

Delivery Valve Operation

Function of the delivery valve and reverse suction for preventing dripping.

Injection Nozzle Function

Details on the throttle type injection nozzle, fuel delivery, and pressure adjustment.

Governor Mechanism

Governor Mechanism (OC60-E2) - Starting

Governor operation during engine starting for the OC60-E2 model.

Governor Mechanism (OC60-E2) - Idling

Governor operation at idling speed for the OC60-E2 engine.

Governor Mechanism (OC60-E2) - Speed Control

Governor operation from idling to maximum speed for the OC60-E2 engine.

Governor Mechanism (OC60-E2) - Max Speed

Governor operation at maximum engine speed for the OC60-E2 engine.

Governor Mechanism (OC60-E2) - Engine Stop

Governor mechanism for stopping the engine on the OC60-E2 model.

Governor Mechanism (OC95-E2) - Starting

Governor operation during engine starting for the OC95-E2 model.

Governor Mechanism (OC95-E2) - Idling

Governor operation at idling speed for the OC95-E2 engine.

Governor Mechanism (OC95-E2) - Speed Control

Governor operation from idling to max speed for the OC95-E2 engine.

Governor Mechanism (OC95-E2) - Max Speed

Governor operation at maximum engine speed for the OC95-E2 engine.

Governor Mechanism (OC95-E2) - Engine Stop

Governor mechanism for stopping the engine on the OC95-E2 model.

Electrical System

Electrical System Overview

Components of the electrical system: starting, charging, and key switch.

Troubleshooting Engine Issues

Engine Does Not Start Troubleshooting

Common causes and solutions for an engine that fails to start.

Rough Engine Revolution Troubleshooting

Troubleshooting steps for rough engine running and instability.

White;Blue Exhaust Gas Troubleshooting

Diagnosing issues causing white or blue exhaust smoke.

Black;Gray Exhaust Gas Troubleshooting

Diagnosing issues causing black or dark gray exhaust smoke.

Deficient Engine Output Troubleshooting

Addressing problems related to reduced engine power output.

Excessive Lubricant Oil Consumption

Identifying causes and solutions for high engine oil consumption.

Fuel in Lubricant Oil Troubleshooting

Diagnosing and resolving fuel contamination in the engine lubricant.

Low Oil Pressure Troubleshooting

Causes and solutions for low engine oil pressure.

Engine Overheating Troubleshooting

Diagnosing and resolving engine overheating issues.

Servicing Specifications

Cylinder Head Specifications

Specifications for cylinder head surface flatness, top clearance, and gasket thickness.

Compression Pressure Specifications

Factory and allowable limits for engine compression pressure.

Valve Clearance and Seat Specifications

Specifications for valve clearance, seat width, angle, and recessing.

Valve Stem and Guide Specifications

Camshaft and Crankshaft Specifications

Lubricating System Specifications

Specifications for engine oil pressure and rotor clearances.

Fuel System Specifications

Specifications for injection timing, fuel tightness, and injection pressure.

Tightening Torques

Special Use Fastener Torques

Tightening torques for specific screws, bolts, and nuts.

Checking, Disassembling, and Servicing

Engine Body Checks and Adjustments

Top Clearance Measurement

Lubricating System Checks

Fuel System Checks and Adjustments

Delivery Valve Tightness and Nozzle Spray

Fuel Injection Pressure and Valve Seat

Disassembling and Assembling

Draining Engine Oil and Fuel

Cylinder Head and Valves Disassembly

Cylinder Head and Valve Removal

Injection Pump and Nozzle Disassembly

Side Cover Removal and Installation

Governor Gear and Oil Pump

Camshaft and Tappet Removal

Piston and Connecting Rod Disassembly

Piston Ring Installation

Flywheel Removal and Installation

Crankshaft Removal

Injection Nozzle Disassembly and Adjustment

Starter Disassembly (OC60-E2)

Starter Disassembly (OC95-E2)

Servicing Procedures

Cylinder Head and Valves Servicing

Valve Seat Contact and Correction

Valve Stem-Guide and Spring Specs

Piston Pin and Bushing Specifications

Piston Ring Gap and Groove Clearance

Crank Pin and Bearing Clearance

Oil Pump Rotor Clearances

Starter Commutator and Mica Servicing

Starter Brush Wear and Armature

Kubota WSM OC60-E2 Specifications

General IconGeneral
BrandKubota
ModelWSM OC60-E2
CategoryEngine
LanguageEnglish

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