13 GENERAL INFORMATION
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GENERAL REPAIR INSTRUCTIONS
Before performing any service operation with the engine mounted, disconnect the grounding cable
from the battery.
This will reduce the chance of cable damage and
burning
due to short circuiting.
Always use the proper tool or tools for the job at hand.
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mere specified, use the specially designed tool or tools.
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Use genuine ISUZU parts referring ISUZU PARTS CATALOG for the engines surely.
Never reuse cotter pins, gaskets, O-rings, lock washers, and self locking nuts. Discard them as you
remove them. Replace them with new ones.
Always keep disassembled parts neatly in groups. This will ensure a smooth reassembly operation.
It is especially important to keep fastening parts separate. These parts vary in hardness and design,
depending on their installation position.
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All parts should be carefully cleaned before inspection or reassembly.
Oil ports and other openings should be cleaned with compressed air to make sure that they are com-
pletely free of obstructions.
Rotating and sliding part surfaces should be lubricated with oil or grease before reassembly.
If necessary, use a sealer on gaskets to prevent leakage.
Nut and bolt torque specifications should be carefully followed.
Always release the air pressure from any machine-mounted air tank(s) before dismounting the engine
or disconnecting pipes and hoses. To not do so is extremely dangerous.
Always check and recheck you work. No sewice operation is complete until you have done this.
Information contained in the “Main Data and Specifications” of the Workshop Manual and the
Instruction Book may differ. In this case, the information contained in the Instruction Bo.ok should be
considered applicable.
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NOTES ON THE FORMAT OF THIS MANUAL
This Workshop Manual is applicable to the 4BG1, 4BGlT, 6BG1, and 6BGlT family of industrial diesel
engines. Unless otherwise specified, these engines have common parts and components as well as data
and qqecifications.
Illustrations used in this Workshop Manual are based on the 6BGl and 6BGlT engines.
The 4BGlTengine and the 6BGlT engine are turbocharged.
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Find the applicable section by referring to the Table of Contents at the beginning of the Manual.
Cdmmon technical data such as general maintenance items, service specifications, and tightening
torques are included in the “General Information” section.
Each section is divided into sub-sections dealing with disassembly, inspection and repair, and
reassembly.
The section ENGINE ASSEMBLY is an exception. This part is divided into three sections to facilitates
quick indexing.
When the same servicing operation is applicable to<--everal different units, the manual will direct you
to the appropriate page.
For the sake of brevity, self-explanatory removal and installation procedures are omitted.
More complex procedures are covered in detail.
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