Precautions for Service Work
(1) Precautions for Safety
Read the safety precautions given at the beginning of this manual carefully and always mind safety in
work.
(2) Preparation for Service Work
Preparation is necessary for accurate, efficient service work. Check the customer ledger file for the
history of the engine.
Preceding service date
Period/operation hours after preceding service
Problems and actions in preceding se
rvice
Replacement parts expected to be required for service
Recording form/check sheet require
d for service
(3) Preparation before Disassembly
Prepare general tools, special service tools, measuring instruments, oil, grease, non-reusable parts,
and parts expected to be required for replacement.
When disassembling complicated portions, put match-marks and other marks at places not
adver
sely affecting the function for easy reassembly.
(4) Precautions in Disassembly
Each time a parts is removed, check the part installed state, deformation, damage, roughening,
surface defect, etc.
Arrange the removed parts orderly with clear distin
ction between those to be replaced and those to
be used again.
Parts to be used again shall be washed and cleaned sufficiently.
Select especially clean locations and use clean tools for disassembly of hyd
raulic units such as the
fuel injection pump.
(5) Precautions for Inspection and Measurement
Inspect and measure parts to be used again as required to determine whether they are reusable or not.
(6) Precautions for Reassembly
Reassemble correct parts in correct order according to the specified standards (tightening torques,
and adjustment standards). Apply oil important bolts and nuts before tightening when specified.
Always use genuine parts for replacement.
Always use new oil seals, O-rings, packing and co
tter pins.
Apply sealant to packing depending on the place where they
are used. Apply of grease to sliding
contact portions, and apply grease to oil seal lips.
(7) Precautions for Adjustment and Check
Use measuring instruments for adjustment to the specified service standards.
How to Read this Manual
(1) Range of Operation Explanation
This manual explains the troubleshooting, installation/removal, replacement, disassemble/reassembly,
inspection, adjustment and adjusting operation procedures for the TNV series engines with direct
injection system.
Refer to the manufacturer’s manual for each of the
fuel injection pump, gove
r
nor, starting motor and
alternator e
xcept for their
installation.
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