Usage, repair and maintenance specification of CAC gasoline engine
—the size of crankshaft thrust, thrust washer and cylinder
block thrust： unit：mm
Fig. 68
Two thrust pieces
level
The size of
cylinder body
thrust
The size of
crankshaft thrust
The thickness of
thrust washer
standard
24±0.03 28.825—28.875 2.326±0.025
oversize
0.38
24±0.03 29.205—29.255 2.516±0.025
Installation：
——Before installation, use the second screw tap taps the
threaded hole in cylinder body, especially the threaded
hole of cylinder head bolt and main bearing bolt.
The threads of cylinder head bolt is M10×1.5—6H，
the threaded hole of main bearing bolt is M12×1.75—
6H。
——The installation of crankshaft woodruff key
Drive the semicircular key into key groove lightly.
The magnitude of interference for key and key groove is
0.00—0.051mm。After the semicircular key is installed,
check the protrusion height. It should be 1.392 —
1.739mm.
——Crankshaft thrust washers are two pieces. They are
only installed on the front and back thrust surface of
cylinder block.
Before installation, apply the engine oil on the
surface with oil groove of thrust washer. position the
surface with oil groove towards the cylinder body and the
surface with oil groove towards crankshaft.
——During installing crankshaft, engine oil should be
applied main journal, connecting rod journal, thrust
surface and bearing half.
——The character like 1,2,3,4,5 are casted on the top of
main bearing cap and also an arrow. During assembling,
install them from the front according to the sequence. At
the same time, have the arrow pointing to the front end
surface of cylinder block. The width of main bearing cap
1,2,4,5 is same, but the width of main bearing cap 3 is
larger than others.
The main bearing cap is retained by rabbet. It is
press fit between rabbet and cylinder body. The press fit
clearance is 0.025—0.145mm. After installation, the
surface of the first and the fifth main bearing caps should
be even or lower than the front and back end surface of
cylinder body.
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