SkyTrak 8042 Service Manual - Manual (Page 331)

Engine: Cummins 4BT3.9 and 4BTA3.9
7A.8 Model 8042, 10042, 10054 Legacy Rev. 10/03
7A.3 ENGINE SERIAL NUMBER
The Cummins 4BT3.9 or 4BTA3.9 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.
7A.4 SPECIFICATIONS AND
MAINTENANCE INFORMATION
For engine, coolant and oil specifications, and
maintenance information, refer to Section 2, “General
Information and Specifications.”
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.
7A.5 STANDARD PRACTICES
7.5.1 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.
7A.5.2 Gaskets and O-rings
NEVER reuse 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.
7A.5.3 Capscrews, Nuts and Metric Parts
When replacing capscrews, ALWAYS use a capscrew of
the same size and strength (Grade) as the capscrew
being replaced. Incorrect capscrews can result in engine
damage. Return capscrews removed from the engine to
their original locations.
Always replace used elastic locknuts with new elastic
locknuts.
The Cummins 4BT3.9 and 4BTA3.9 engines use 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.
MS1152
Front of
vehicle
1
M8 x 1,25 - 25
Length, in millimeters
Distance between threads, in millimeters
Major thread diameter, in millimeters