Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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gg. Take out the crankshaft timing gear.
hh. Rotate the bolts of master bearing cap as per
specified sequence to pull out the bolts of master
bearing cap and remove the main shaft bushes
(Position the main shaft bushes orderly).
ii. Overturn the crankshaft to take out the crankshaft
thrust plate and remove the crankshaft and the
crankshaft lower bushes.
jj. Check the wear state of the crankshaft thrust plates.
kk. Disassemble the piston cooling fuel injection pipe
subassembly.
5. Check the parts.
a. Check the lower surface of the cylinder head. Strict
planeness tolerance is required for the fitting surface of
the intake and exhaust branch pipes.
b. These surfaces can be repaired by grinding. If the
surface planeness is out of the specified tolerance,
grind the surface to meet the technical requirements. If
the planeness is excessively out of the technical
requirements, replace the cylinder head.
Deflection of cylinder head lower surface 0.05 or
less Limit 0.20
Cylinder head height Standard value 92 Limit
91.55
c. Use ruler and feeler gauge to measure the deflection of
fitting surface between exhaust branch pipe and
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