O P E R A T I O N & M A I N T E N A N C E M A N U A L
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gas distribution and timing and increase noise of the valve structure; insufficient
clearance may lead to incomplete closing and burning of the air valve.
2
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Cylinder block
The cylinder body is made of cast iron HT250 and portal shape structure is adopted.
Besides the installation hole, bolt hole for cylinder head on the top of the cylinder body,
the water hole to the cylinder head, and lubricant hole at the back of the cylinder body to
the cylinder head are on it.
Water pump and engine oil pump are installed at upper part and lower part of
front-end of the cylinder body. Fly wheel casing is installed at back-end of the cylinder
body. The lubricant inlet and bolt hole for installing crankcase oil tray are located at the
bottom of the cylinder body. When dismantling the diesel for repair, each oil channel shall
be repaired to ensure clean and unblocking. Bulkhead of each channel shall be sealed
and oil leakage is not allowed.
The main bearing is of fully-supported suspending type. Matching brazing is
employed for main bearing casing and the cylinder body. Matching marks are marked on
the cylinder body and main bearing casing. Any exchange or reverse assembling is not
allowed. The main shaft bushing is the shafting bushing of high tin broze zergarl. When
dismantling it for cleaning, do not mistake the upper and low shaft bushings (the upper
shaft bushing with oil groove). The thrust plate is locates at the last piece of the main
bearing. Each of the two is located at the front and back end respectively. The thrust
plate bears axial thrust of the crankshaft, with oil groove on the work surface and the
reverse side. After crankshaft assembly is completed, it shall be flexible.
The cylinder sleeve is made of boron cast-iron and of wet type. Flange surface of
the cylinder surface is 0.02-0.10mm higher than the body top to ensure sealing of
cylinder sleeve and head. See figure 6.
Fig.6 protruding height of the liner flange
plane relative to the plane of cylinder
block