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jacket opening. The flange plane on cylinder jacket should be 0.04～0.12 mm higher than engine
body top face, so that the cylinder cover gasket can press closely on it, ensuring the tightness
between the cylinder jacket and cylinder cover. See Fig.5.
Fig. 5 Distance between cylinder jacket flange plane and engine body top face
The crankcase sump is made from cast aluminum or by drawing from steel plate. When
cleaning the inside of crankcase sump, do not leave yarn waste on its wall; otherwise the copper
wire gauze of filter and element of lube-oil filter will be clogged.
The assembly of piston and connecting rod consists of piston, piston ring, piston pin,
retaining ring, connecting rod, connecting rod bolts, connecting rod bush and connecting rod
sleeve etc.
Weight difference between assemblies of piston and connecting rod, for same diesel engine,
should be no more than 25g, and weight difference between assemblies of connecting rod should
be no more than 15g.
1. Piston
Combustion chamber at the top of piston should be "ω" shape. Skirt section is processed to
be drum-shape along height direction, and ellipse-shape along circumference direction. On the
piston, there are 2 gas ring grooves and 1 oil ring groove.
2. Piston ring
Ex-circle of first gas ring is plated with porosity chromium, which can help reduce wear-off
between cylinder jacket and piston ring. Second gas ring is a conical-face ring. When fitted, its
side marked with "Up" should face towards the top face of piston, and do not reverse it.
Oil ring is inside-swell ring. Such ring still can remain certain radial elastic force, when its
elasticity is reduced due to wear-off. Therefore the service life of the oil ring can be prolonged.
1-Engine body
2-Cylinder liner
III. Piston & connecting rod
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