TM 5-2420-230-24-2
General Repair Instructions
B3.9 and B5.9 Series Engines
Page i-6
Section i - Introduction
General Repair Instructions
This engine incorporates the latest technology at the time it was manufactured; yet, it is designed to be repaired using
normal repair practices performed to quality standards.
Cummins Engine Company, Inc. does not recommend or authorize any modifications or repairs to engines
or components except for those detailed in Cummins Service Information. In particular, unauthorized
repair to safety-related components can cause personal injury or death. Below is a partial listing of
components classified as safety-related:
Flywheel Mounting Capscrews
Air Compressor
Fuel Shutoff Assemblies
Air Controls
Fuel Supply Tubes
Air Shutoff Assemblies
Lifting Brackets
Balance Weights
Throttle Controls
Cooling Fan
Turbocharger Compressor Casing
Fan Hub Assembly
Turbocharger Oil Drain Line(s)
Fan Mounting Bracket(s)
Turbocharger Oil Supply Line(s)
Fan Mounting Capscrews
Turbocharger Turbine Casing
Fan Hub Spindle
Vibration Damper Mounting Capscrews
Flywheel
Flywheel Crankshaft Adapter
Follow all safety instructions noted in the procedures
-- Follow the manufacturer's recommendations for cleaning solvents and other substances used during the
repair of the engine. Some solvents and used engine oil have been identified by government agencies as
toxic or carcinogenic. Avoid excessive breathing, ingestion and contact with such substances. Always use
good safety practices with tools and equipment.
Provide a clean environment and follow the cleaning instructions specified in the procedures
-- The engine and its components must be kept clean during any repair. Contamination of the engine or
components will cause premature wear.
Perform the inspections specified in the procedures
Replace all components or assemblies which are damaged or worn beyond the specifications
Use genuine Cummins new or ReCon service parts and assemblies
-- The assembly instructions have been written to use again as many components and assemblies as possible.
When it is necessary to replace a component or assembly, the procedure is based on the use of new
Cummins or Cummins ReCon components. All of the repair services described in this manual are available
from all Cummins Distributors and most Dealer locations.
Follow the specified disassembly and assembly procedures to avoid damage to the components
Complete rebuild instructions are available in the shop manual which can be ordered or purchased from a Cummins
Authorized Repair Location. Refer to Section L -- Service Literature for ordering instructions.
g-03 (repair)
L-548
