Crankshaft & Flywheel - FAW Jiefang Automotive 485 Operation & Maintenance Manual

100～120℃. With a appropriate forcer being padded, gently tap the piston pin out or push the pin
in. Clean engine oil should be applied into the pinhole and connecting rod sleeve. After the piston
pin is fitted, other retaining ring should be fitted.
4. Connecting rod and its bush
The body of connecting rod has a cross-section of "I" shape. The connecting rod and connecting
rod cap are pair-bored. Therefore they should be fitted as per pair marks, and do not make mistake.
In the hole of small end of connecting rod, bronze bush is press-fitted. Oil-hole on the bush
must be aligned with the oil-hole above the small end, to ensure splash and lubrication onto the
piston pin and bush.
When clearance, due to wear-off of the bush, exceeds limit value, or when serious stripping
or burning occurs on the surface, replacement with a new pair should be made.
When the engine is overhauled, or when the connecting rod is replaced with a new one, it is
necessary to check the parallelism of axes of small end hole to big end hole. The parallelism
should be no more than 0.03mm for 100mm at vertical direction, and be no more than 0.06mm for
100mm at horizontal direction. Correct it, if above-mentioned values are exceeded.
Before the assembly of piston and connecting rod is fitted into (or removed from) cylinder
jacket, it is necessary to scrape completely the soot and oil dirt at upper part of the jacket. Before
it is fitted, it is necessary to apply some clean-use engine-oil, on cylinder-jacket opening, outer
surface of the piston and the surfaces of piston ring, rod bush and crankshaft rod journal etc. Then
place the guide sleeve onto the cylinder jacket. Turn the crankshaft, and carefully put the assembly
of piston and connecting rod into the cylinder jacket. Tighten the bolts on the rod one by one, in
several times, as per specified tightening-torque value. After tightening the bolts, the crankshaft
should be able to rotate freely and smoothly, if turned by hands.
1. Crankshaft
At the front end of crankshaft, is fitted crankshaft timing gear, engine-oil pump drive gear,
crankshaft pulley. At the rear end of crankshaft, is fitted with the bearing and flywheel, positioned
by positioning pin(s) and secured by 6 bolts on flywheel tightened as per specified
tightening-torque. The bolts on flywheel are prevented from being loosened, by 3 locking pieces.
At the center of flange, is fitted a E60203 bearing, for supporting the drive shaft of gearbox. On
the crankshaft pulley is marked scale line, used to watch the fuel-supply advance angle. On the
cover of timing gear chamber, is fitted an indicator, used to indicate the degree of fuel-supply
advance angle.
IV. Crankshaft & flywheel
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