Suzuki WagonR+ RB310 Service Manual page 1866

6A-4 ENGINE MECHANICAL
1. Camshaft 9. Check ball spring
2. Cylinder head 10. Check ball cage
3. Valve stem 11. Plunger spring
4. Oil gallery 12. Chamber "A"
5. Bucket body 13. Chember "B"
6. Plunger 14. Direction of
7. Body camshaft rotation
8. Check ball 15. Oil flow
1. Camshaft
2. Valve lash adjuster
3. Oil gallery
4. Valve spring
5. Valve spring seat
CYLINDER HEAD, VALVE TRAIN AND
HYDRAULIC VALVE LASH ADJUSTER
The cylinder head is made of cast aluminum alloy and has three
combustion chambers arranged in-line.
The single overhead camshaft driven by the crankshaft through the
timing belt is mounted on the cylinder head. It has six cams and op-
erates the intake and exhaust valves via the hydraulic valve lash
adjuster.
OPERATION OF HYDRAULIC VALVE LASH ADJUSTER
The hydraulic valve lash adjuster located between the camshaft
and valve stem is direct acting type. With the engine oil delivered
into it from the oil pump, the adjuster operates as follows so as to
adjust the valve lash (clearance) to "O" automatically at all time.
1) When the camshaft doesn't push the bucket body, the bucket
2) When the cam crest of the camshaft start pushing the bucket
3) When pushing of the cam crest of the camshaft against the buck-
6. Valve spring
retainer
7. Valve stem seal
8. Valve stem
9. Valve guide
body is pushed against the cam and the body against the stem
by the plunger spring force. In this state, the valve lash is kept
to "O". (At "O" valve lash, the oil pressure becomes equal in the
chambers "A" and "B", and the check ball closes the passage be-
tween these two chambers.)
body, the bucket body and plunger are pushed downward and
at the same time the body is pushed upward by the counter force
from the valve stem. As a result, the chamber "B" is compressed
and the pressure rises high. Then the oil in the chamber "B"
leaks through the slight clearance between the body and plung-
er. However, as the compression time is very short, the volume
hardly changes and thus the bucket body, plunger and body,
substantially as one unit, push down the valve stem to open the
valve.
et body is over, the operation as described in above 1) starts
again. As the oil pressure in the chamber "B" is lower than that
in "A" (for the oil in the chamber "B" under high pressure has
leaked gradually in above 2)), the oil pressure in the chamber "A"
pushes the check ball open to allow the oil to flow from the cham-
ber "A" to chamber "B" till the oil pressure becomes equal be-
tween the two chambers.