Weifang 495 - Camshaft Assembly

The valve gear consists of camshaft , Camshaft timing gear·, tap-
pets ,push rods ,rocker arms and valves as shown in Fig.4.-
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Fig. 4 Camshaft assembly
l--Camshaft; 2·-C·Amshaft timing gear; 3-Gear washer; 4-' Key; 5-
Camshaft thrust plate;6---------. Valve tappet;7-Push rod.'
The camshaft is .sllpported by three bushings' 'of 'same diame-
ter and drivell by the crankshaft timing gear through the idling
gear and camshaft timing gear. Between the camshaft timing gear
and the camshaft sh'oulder,a thrust plate is provided to control the
axial play. The canlshaft can be drawn out together with the gear
by removing the two fastening screws of the thrust plate through
the ro.und hole on the camshaft timing gear.
There is an offset of 1. 5mm between the center lines of the
mushroom - shaped tappet and, the ca.ID, which makes the tappet to
rotate around its'own centre line in operation for evening the wear
on its bottom surface.
The vaive timing of the diesel engine is shown in Fig~ 5. In or-
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