7.7
Model 644E-42/944E-42
Rev. 6/04
Engine: Cummins 4BT 3.9, B4.5T and QSB 4.5T
7.3
ENGINE SERIAL NUMBER
The serial number (1) is stamped on the front of the
engine block, near the fan pulley. Information contained
in the serial number is required in correspondence with
the engine manufacturer.
Supply the engine serial number and/or data tag
information when communicating about an engine or
engine components.
7.4
SPECIFICATIONS AND
MAINTENANCE INFORMATION
For engine, coolant and oil specifications and
maintenance information, refer to Section 2, “General
Information, Specifications and Maintenance.”
Note: Detailed Cummins engine service instructions
(covering disassembly, inspection, internal repair,
assembly, adjustment and troubleshooting information)
are provided in the appropriate Cummins engine service
manual.
7.5
STANDARD PRACTICES
7.5.1
Left and Right Sides of the Engine
Throughout this section, the front, rear, left and right of
the engine are references made when viewed from the
operator’s seat, with the operator facing forward.
7.5.2
Cleanliness
Cleanliness is very important during engine repair.
Contamination 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.
7.5.3
Gaskets and O-rings
NEVER re-use a gasket or o-ring. Use new gaskets and
o-rings. Thoroughly clean sealing surfaces before
installing 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.
7.5.4
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
damage. Return capscrews removed from the engine to
their original locations.
The engine uses parts that are of metric dimensions.
Metric capscrews are described, in millimeters, 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.
MU1420
Front of
vehicle
1
M8 x 1,25 - 25
Length, in millimeters
Distance between threads, in millimeters
Major thread diameter, in millimeters
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