D439E Service Manual 2. Engine Mechanical System (D439E)
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7. Camshaft assembly (1) consists of cam sensor
plate, thrust plate, cam and journal. Camshaft
gear is coupled with the idler gear A (2).
Crankcase and Cylinder Sleeve
1. Crankcase is manufactured firmly with cast iron to
prevent stress concentration and deformation.
2. The 5 camshaft bushes are installed to the
camshaft bore of the crankcase.
To facilitate the removal and installation of
camshaft, inner diameter of bush is tapered to the
rear side.
3. Cylinder sleeve made of special cast iron is
pressed fit into the crankcase.
Piston
1. Piston pin type is full float type and piston pin is
offset from thrust.
2. Marks on the piston indicate weight, part number
and oversize. The front mark indicates the front
direction of the engine.
NOTE : When assembling a piston, let the arrow
mark (→) faced to the center of cylinder head bolt
hole.
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