Kohler Engines Magnum MV16, MV18, MV20 Twin Cylinder Engine Service Manual 40548000 English

Brands: Kohler Engines

Equipment Type: Twin Cylinder Engine

Manuals Type: Service Manual

Machine Model & Serial Number: Magnum MV16, MV18, MV20 (Vertical Crankshaft)

Region: N/R

Book Code: 40548000 (TP-2289-A)

Issued: December 1986 / Revised December 1989

Language: English

Pages: 112

File Format: Portable Document Format (PDF)

Remark: Ultimate factory workshop manual for Kohler Magnum vertical crankshaft V-twin engines. Complete Engine Overhaul Guide. High Value: Includes exhaustive internal reconditioning procedures for cylinder barrels (boring and crosshatch honing), Posi-Lock connecting rod fitment, and crankshaft journal regrinding. Features detailed diagnostics for the full-pressure lubrication system, Oil Sentry™ pressure monitors, and Walbro-built fixed/adjustable jet carburetors.

Table of contents

• SECTION 1 - GENERAL INFORMATION
  • Engine Identification (Model, Spec, and Serial Interpretation)
  • Oil Recommendations (API Service SF and Viscosity Grades)
  • Fuel Recommendations and Vented Cap Precautions
  • Overall Dimensions and Power/Torque Specifications
  • Standard Torque Values (Metric/English) and Conversions
• SECTION 2 - SPECIAL TOOLS
  • Special Service Tool Kit NU-3211-A (Valve, Seal, and Bearing Installers)
  • Engine Analysis Kit No. 25 800 01 (Digital Analyzer, Manometer)
  • Electronic Ignition System Tester Construction
• SECTION 3 - PERIODIC MAINTENANCE
  • Required Maintenance Schedule
  • Oil and Filter Change Intervals
  • Air Cleaner Precleaner and Paper Element Service
  • Checking Valve-To-Tappet Clearance (TDC Method)
  • Cleaning Cylinder Heads and Combustion Chambers
• SECTION 4 - TROUBLESHOOTING
  • Troubleshooting Guide (Cranks but won't start, Overheating, Loss of Power)
  • External Engine Inspection and Sludge Analysis
  • Basic Engine Tests (Crankcase Vacuum Manometer Test)
  • Compression Test Procedures and Conclusions
• SECTION 5 - AIR CLEANER
  • Disassembly and Reassembly of High-Density Paper Element
  • Breather Hose Sealing Precautions
• SECTION 6 - FUEL SYSTEM AND GOVERNOR
  • Fuel Pump Operation (Nylon Body Benefits) and Installation
  • Fixed Jet Carburetor Service
    • Identification of "Off-Idle" and Bowl Vent Ports
    • Adjustment Procedures (Idle Fuel and Idle Speed)
    • Complete Disassembly and Welch Plug Removal
    • Float Level Adjustment (.690"/.720" Parallel Setting)
  • Centrifugal Flyweight Mechanical Governor
    • Operation and Sensitivity Adjustment
    • Initial Adjustment Sequence (Cross Shaft to Arm Synchronization)
• SECTION 7 - LUBRICATION SYSTEM
  • Full-Pressure Lubrication Path Schematic
  • Oil Pump Overhaul (Gerotor and Drive Gear End Play)
  • Oil Pressure Relief Valve (Ball, Spring, and Sleeve Inspection)
  • Oil Sentry™ Pressure Monitor Testing (2.0-5.0 psi range)
  • Engine-Mounted vs. Remote Mounted Filter Configurations
• SECTION 8 - ELECTRICAL SYSTEMS AND COMPONENTS
  • Magnum Electronic Magneto Ignition Operation
  • Ignition System Troubleshooting (Primary and Secondary Resistance Tests)
  • Spark Plug Condition Analysis (Worn, Fouled, Overheated)
  • Battery Charging Systems
    • 15 Amp Regulated System Diagrams and Testing
    • 25 Amp Regulated System Diagrams and Testing
  • Keyswitch and Starter Solenoid Testing
  • Bendix Drive Electric Starter Overhaul and Drive Spline Lubrication
• SECTION 9 - DISASSEMBLY
  • Typical Disassembly Sequence
  • Identifying #1 and #2 Engine Sides
  • Cylinder Barrel and Piston Removal Precautions
  • Splitting the Crankcase (Using Splitting Notches)
• SECTION 10 - INSPECTION AND REPAIR/RECONDITIONING
  • Cylinder Head Flatness (.003" Limit)
  • Cylinder Barrel Reconditioning (Boring Bar and Honing Crosshatch)
  • Valve Train Overhaul (Valve Guide Removal/Installation, Reaming)
  • Valve Seat Insert Pulling and Cutting
  • Piston and Ring Service (Style D Identification and Orientation)
  • Posi-Lock Connecting Rod Inspection and Undersize ID
  • Crankshaft Fillet Intersection Requirements
• SECTION 11 - REASSEMBLY
  • Oil Pump Drive Gear Backlash Setting
  • Posi-Lock Connecting Rod Torque Sequence
  • Crankshaft and Camshaft End Play Measurement
  • Crankcase Sealant Pattern and Fastener Torque
  • Piston Installation Direction ("Fly" mark orientation)
  • Magnet-To-Module Air Gap Adjustment (.008"/.012")

Foreword
This manual provides instructions for the complete overhaul of Kohler Magnum twin cylinder engines. Accurate measurement of the piston-to-bore clearance is critical; never use a feeler gauge for this task—a micrometer is required. Style D pistons must always be installed with the "Fly" mark pointing towards the flywheel side. To prevent damage to the electronic ignition module, never connect 12 volts to the module or any wire connected to the kill terminal.