Maintenance Manual for J2 Sedan
Mechanical Part of Engine
33
Chapter I Mechanical Part of Engine
Section I Engine Body
I.
General Precautions
1. Precautions on Discharging Engine Coolant
Discharge coolant after engine has cooled down.
2. Precautions on Disconnecting Fuel Pipeline
1) Before the operation, ensure that the operating area is free of objects which may cause combustion
or sparks.
2) Disconnect the piping, plug openings to prevent leakage of fuel.
3. Precautions on Dismantlement and Disassembly
1) Use special tools as required in Instruction. Always operate safely; any forcible operations and
operations other than that specified in Instructions are forbidden.
2) Take particular care not to damage the matching face or the sliding face.
3) Use the adhesive tape or equivalent to cover the opening of engine system so as to prevent the entry
of foreign bodies, if necessary.
4) For the purpose of troubleshooting and reassembly, methodically mark and neaten the disassembled
parts.
5) When loosening the bolts and nuts, follow this basic principle: “outmost ones first, diagonal ones
second, and so on”. Conduct the operation in compliance with the loosening sequence, if specified.
4. Precautions on Check, Repair and Replacement
Thoroughly check the parts before repair or replacement. Check the substitutive parts by the same
means, and then replace as required.
5. Precautions on Assembly and Installation
1) Use the torque spanner to tighten the nuts and bolts.
2) When tightening the nuts and bolts, follow this basic principle: screw up the central nuts and bolts
with the same torque in steps, and then carry out the same operation with the internal and external
diagonal ones. Perform the operation in accordance with the tightening sequence, if it is specified.
3) Replace gaskets, oil seal or O-ring with new ones.
4) Thoroughly rinse, clean and dry every part. Carefully check the engine oil pipeline or engine
coolant pipeline for obstruction.
5) Never damage the sliding face and the matching face. Completely eliminate the foreign bodies such
as cloth scraps or the dust. Before assembly, paste the sliding face with engine oil.
6) When refilling engine coolant after draining completely, release air from the pipes at first.
7) After repair, start the engine and run with high speed to check for any leakage of the engine coolant,
fuel, engine oil and exhaust gas.
