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Usage, repair and maintenance specification of CAC gasoline engine
—the size of crankshaft thrust, thrust washer and cylinder block thrust: unit:mm Fig. 68 T w o thrus t pieces
level The size of The size of The thickness of standard 24±0.03 28.825—28.875 2.326±0.025 oversize 24±0.03 29.205—29.255 2.516±0.025
Installation: 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。 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. 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. applied main journal, connecting rod journal, thrust surface and bearing half. 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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