Valve Clearance Adjustment - Yanmar 6LPA-STP2 Service Manual

Valve Clearance Inspection and Adjustment
12/05

Valve Clearance Adjustment

1. Loosen (Figure 5-221, (1)) the lock nut on the
valve bridge (Figure 5-221, (2)) and adjust the
adjusting screw (Figure 5-221, (3)) until the two
bridge heads come into contact with the two
valve stem heads.
Note: Secure the valve bridge using a wrench
and loosen the lock nut. NEVER apply
any torque to the valve bridge.
Figure 5-221
(2)
Figure 5-221
2. Loosen the lock nut on the valve rocker arm and
then the adjusting screw.
3. Insert a 0.20 mm feeler gauge
(Figure 5-222, (1)) between the adjusting
screw (Figure 5-222, (2)) on the valve rocker
arm (Figure 5-222, (3)) and the valve bridge for
the intake size and a 0.50 mm feeler gauge
(Figure 5-222, (1)) for the exhaust side.
6LPA Service Manual
(1)
(3)
(1)
0005220
© 2007 Yanmar Marine International
Figure 5-222
(5)
(1)
Figure 5-222
4. Turn the adjusting screw (Figure 5-222, (4)) on
the valve rocker arm, slightly slide the feeler
gauge, and lock (Figure 5-222, (5)) the
adjusting screw by the lock nut.
5. Check that the resistance of the feeler gauge is
the same when the feeler gauge is inserted and
the adjusting screw on the valve bridge is
loosened (Figure 5-223). If not, readjust using
the procedure in the following steps 7 to 9.
Figure 5-223
(1)
Figure 5-223
1 – Slide Feeler Gauge
2 – Loosen Adjusting Screw
3 – Adjusting Screw
4 – Valve Bridge
ENGINE
(4)
(2)
(3)
0005221
(2)
(3)
(4)
0005222
5-91