ENGINE
5-28
6LPA Service Manual
Cylinder Head
© 2007 Yanmar Marine International
3. Measure the inside diameter of the rocker arm
using a caliper gauge (Figure 5-41).
• Rocker arm inside diameter:
20.012 to 20.033 mm (0788 to 0.789 in.)
Figure 5-41
Figure 5-41
4. Measure the rocker arm shaft diameter using a
micrometer (Figure 5-42).
• Shaft outside diameter: 19.972 to 19.993 mm
(0.786 to 0.787 in.)
Figure 5-42
Figure 5-42
5. Subtract the rocker arm shaft diameter from the
inside diameter of the rocker arm.
• Standard oil clearance: 0.019 to 0.061 mm
(0.007 to 0.0024 in.)
• Maximum oil clearance: 0.10 mm (0.004 in.)
If the measured oil clearance exceeds the
specified maximum, replace the rocker arm shaft
and rocker arm.
6. Assemble all parts as shown in Figure 5-40.
Camshaft and Bearing Inspection
1. Install the camshaft on a V-block to measure
camshaft runout on the center journal. Use a
dial indicator to measure runout while turning
(Figure 5-43).
• Maximum circle runout: 0.10 mm (0.004 in.)
If the measured runout exceeds the specified
maximum, replace the camshaft.
Figure 5-43
Figure 5-43
2. Measure the cam lobe height using a
micrometer (Figure 5-44).
Standard cam lobe height:
• Intake side: 48.498 to 48.598 mm
(1.909 to 1.913 in.)
• Exhaust side: 50.734 to 50.834 mm
(1.997 to 2.001 in.)
Minimum cam lobe height:
• Intake side: 47.998 mm (1.887 in.)
• Exhaust side: 50.234 mm (1.978 in.)
If measured cam lobe height is less than the
specified minimum, replace the camshaft.
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