D439E Service Manual 2. Engine Mechanical System (D439E)
18
Piston Ring
Piston has two compression rings and one oil ring.
All sliding surfaces of rings are coated with
hardened chrome.
Crankshaft
1. Crankshaft is forged with high-strength alloy built
in with balance weight.
2. Pin, journal and oil seal sliding-surface are
hardened with high frequency heat treatment to
raise the resistance against frictional wear.
3. Through oil passage at the pin and journal, oil
lubricates main bearing. Oil flows to the pin for the
lubrication of connecting rod bearing.
4. Crankshaft pulley and crankshaft gear are
installed at the front end of crankshaft. The
crankshaft pulley drives alternator and water
pump using V-belt.
5. Crankshaft damper pulley absorbs the distorting
vibration of crankshaft.
6. Crankshaft gear (1) drives camshaft gear (2), idler
gear A (3), idler gear B (4), supply pump gear (5)
and oil pump gear (6).
Crankshaft Main Bearing
Upper main bearing has oil groove and oil hole
which matches with oil hole of the crankshaft.
Divided type thrust plate is Installed to the both ends
of the last bearing (N0.5).
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