
The outer diameter of the replacement guides is 0.2 mm big-
ger. Bearing housing 5 with camshaft 6 is fitted to the cylinder
head.
Valve train.
Valves 2 are operated by the cams through
levers 4. One end of the lever pushes the valve stem, while the
other end rests on the spherical head of adjuster bolt 7 which
adjusts the clearance A in the valve gear.
Valve clearance adjustment
The clearances are adjusted on the cold engine by means of
the chain adequately tensioned. The adjustment should result is
0.15±0.02 mm clearance for the intake valves and 0.2±0.02 mm
clearance for the exhaust valves.
While making adjustments, do not to twist the valve lever,
since it may result in a bigger final clearance.
The clearance is adjusted as follows:
- turn the crankshaft clockwise to align the indentation in the
camshaft sprocket with the mark on the bearing housing, which
corresponds to the end of the compression stroke of the cylinder
No4. Now in this position adjust the clearance at the cylinder No4
exhaust valve (No8 cam) and cylinder No3 intake valve (No6 cam);
- slacken the valve lever adjuster bolt nut;
- between the valve lever and cam place a flat feeler blade
(A.95111) of 0.15 mm for the intake valve (0.2 mm for the exhaust
valve) and using a spanner tighten or slacken the bolt with further
27
Fig.2-40. Basic dimensions of the valves, valve guides and valve seats
Fig.2-41. Cylinder head cross-sectional view showing the exhaust valve:
1 - cylinder head; 2 - valve; 3 - oil cap; 4 - lever; 5 - bearing housing; 6 -
camshaft; 7 - adjuster bolt; 8 - lock nut; Ä - cam-to-lever clearance
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