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PRECAUTIONS
PRECAUTIONS
Precautions in Draining Engine Coolant
•
Drain coolant only after the engine has cooled down.
Precautions for Disconnecting Fuel Piping
•
Operation should be done in a place free from fire.
•
Release fuel pressure before operation. (Electric controlled
specifications): Refer to "Release of Fuel Pressure" in EC
section.
•
After disconnecting, plug the pipe to prevent fuel from draining.
Precautions for Removing and
Disassembling
•
Use correct STs in the specified position. Always pay attention
to safety.
•
Be careful not to lose surface accuracy of mating or sliding
surfaces.
•
To prevent foreign material from entering the engine, close
openings with appropriate tape as necessary.
•
Arrange disassembled parts in their normal positions in order to
simplify locating the cause of damage or excessive wear and to
ensure correct reassembly.
•
As a rule, nuts and bolts must be untightened in a diagonal
manner starting from an outer one. If a particular untightening
sequence is provided separately, follow the sequence.
Precautions for Inspection, Correction, and
Replacement
•
Following
the
inspection
adequately and repair or replace as necessary. Perform the
same inspections even for new parts and replace them if
necessary.
Precautions for Assembly and Installation
•
Always use a torque wrench when tightening bolts and nuts.
•
Unless otherwise specified, tighten nuts and bolts from inside to
outside in a crisscross pattern. Tighten them gradually and
evenly in 2 to 3 steps.
•
Always replace gasket, packing, oil seals, and O-rings with new
ones.
•
For each part, perform adequate cleaning/washing and drying
with a dryer. In particular, ensure that the oil and coolant
passages are free from plugging and clogging.
•
Remove any dirt and lint on sliding and mating surfaces. Before
assembly, apply ample amount of engine oil to sliding surfaces.
•
If coolant was drained, bleed air from the system.
•
After assembly, start engine and increase the engine speed,
then check coolant, fuel, oil, grease, and exhaust gas for
leakage.
GI-5
procedure,
inspect
the
parts
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