Service manual

Section 8B
8B-6
8B.2 CUMMINS ENGINE SERIAL NUMBER
The Cummins 4BT3.9 serial number is stamped on the
front of the engine block, near the fan pulley. Information
contained in the serial number is required in correspon-
dence with the engine manufacturer.
Figure 8B–2. Cummins engine serial number location.
Supply the engine serial number and/or data tag informa-
tion when communicating about an engine or engine
components.
8B.3 CUMMINS SPECIFICATIONS AND
MAINTENANCE INFORMATION
Engine, coolant and oil specifications and maintenance
information appear in
Section 2 General Information,
Specifications, and Maintenance Instructions
.
Note: Detailed Cummins engine service instructions
(covering disassembly, inspection, internal repair, assem-
bly, adjustment and troubleshooting information) are pro-
vided in the appropriate Cummins engine service
manual.
8B.4 CUMMINS ENGINE STANDARD
PRACTICES
Left and Right Sides of the Engine
Throughout this section, the left or right side of the
engine is as viewed from the flywheel end.
Cleanliness
Cleanliness is very important during engine repair. Con-
tamination of the engine during repair will reduce the life
of an engine. Thoroughly clean the engine and engine
compartment area before attempting to service or repair
the engine.
DO NOT steam clean the following parts:
• Electrical Components
• Wiring
• Injectors
• Fuel Pump
• Belts and Hoses
• Bearings
During reassembly and inspection, thoroughly clean all
parts, and, where present, remove burrs and scales.
Gaskets and O-rings
NEVER re-use a gasket or O-ring. Use new gaskets and
O-rings. Thoroughly clean sealing surfaces before install-
ing a new gasket or O-ring. ALWAYS install new flat-
faced O-rings when servicing hydraulic fittings.
Cover any open ports of high-precision components
(such as fuel system equipment) exposed by removal or
disassembly to help prevent the entry of foreign material.
Capscrews and Metric Parts
When replacing capscrews, ALWAYS use a capscrew of
the same size and strength as the capscrew being
replaced. Incorrect capscrews can result in engine dam-
age. Return capscrews removed from the engine to their
original locations.
The Cummins 4BT3.9 engine uses parts that are of met-
ric dimensions. Metric capscrews are described, in milli-
meters, in terms of major thread diameter, distance
between threads, and overall length.
Metric capscrew dimensions:
Verify that the correct type of part is used at all times.
8B.5 CUMMINS ENGINE COOLING
SYSTEM
The Cummins engine cooling system is a closed, pres-
surized system that consists of coolant passages in the
engine, plus the oil cooler, thermostat, water pump,
hoses, radiator and radiator overflow bottle. The engine
is cooled by the circulation of coolant through passages
in the cylinder block and head. Circulation is by thermo-
siphon action, assisted by an impeller-type water pump,
driven by a fan belt from the crankshaft pulley. The water
pump bearings are prepacked with a special grease and
do not require service. Replace a faulty water pump.
General engine cooling specifications and maintenance
procedures are listed in S
ection 2 General Information,
Specifications, and Maintenance Instructions
.
4BT3.9
1137-X0865
MS1150
Front of
vehicle
Serial number
location
Length, in millimeters
Distance between threads, in millimeters
Major thread diameter, in millimeters
M8 x 1,25 - 25
Model 3606 • Origin 10/99