Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
38
f. Apply engine oil onto the threads of main bearing cap
bolts, install into the main bearing caps, and tighten
the bolts to 170 N.m torque as per the specified
sequence. Tighten to 20 N·m for the 1
st
step, to 120
N·m for the 2
nd
step, and 170 N·m for the 3
rd
step.
Tightening sequence: (From center to two sides)
8415 9
7326 10
g. Adhere the magnetic dial gauge onto the cylinder
block, position the pointer of the dial gauge to the
rear end face of crankshaft, and use a straight
screwdriver to pry lightly the crankshaft to check the
axial clearance of crankshaft (or push the crankshaft
left and right and measure with feeler gauge). If the
thrust clearance is out of the limit, replace the thrust
bearings in pair. Standard value: 0.040mm-0.201mm;
Limit: 0.30mm
h. Rotate the crankshaft and check for flexible rotation
and presence of noise. Alternatively, use a digital
wrench to measure the net torque of crankshaft, listen
for presence of noise, and check whether the torque is
≤6N.m.
a Insert the lubricated tappets in turn into the tappet
holes.
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