Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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Section III Crankshaft and Flywheel System
z It works along with the connecting rod to convert the gas pressure applied onto the piston into rotating power and
transmit to the transmission mechanism of the chassis. At the same time, it drives the valve distribution
mechanism and other accessories, such as fan, water pump, and alternator.
z The crankshaft is made of medium carbon steel alloy forging. To improve the wear resistance and fatigue
resistance, the journal surface is treated with high-frequency hardening or nitriding treatment and high-precision
grounded to meet the higher surface hardness and surface roughness requirements.
z With fully supported structure and 8 balance weights, the crankshaft is cast to an integral structure with balance
weights to improve the rigidity and bending strength of the crankshaft.
z The crankshaft is made of high strength steel alloy forging, with fillet rolled journals.
z Its front end adopts rubber-embedded crankshaft torsional shock absorber to reduce the crankshaft torsional shock
generated during the running of the engine. The signal wheel of crankshaft position sensor is installed at the last
crank.
z There are two pieces of crankshaft thrust plates installed on two sides of the 3rd main bearing block, with the face
with oil groove facing to the thrust surface of the crankshaft.
z The grouping numbers for crankshaft main journal and connecting rod journal are stamped on the first crank of
the crankshaft.
z The flywheel assembly is installed at the rear end of crankshaft and the flywheel is located by locating pin and
connected by flywheel bolts.
z The crankshaft, flywheel, and clutch assembly qualified the dynamic balance test before the factory leave.
Signal gear of flywheel
crankshaft
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