INSPECTION
(1) It is mandatory to use a dial bore gauge to
measure each cylinder bore diameter. To correctly
select the proper size piston, a cylinder bore gauge,
capable of reading in 0.003 mm (.0001 in.) INCRE-
MENTS is required. If a bore gauge is not available,
do not use an inside micrometer (Fig. 143).
Fig. 137 Checking Oil Pump Cover Flatness
1 – STRAIGHT EDGE
2 – FEELER GAUGE
3 – OIL PUMP COVER
Fig. 138 Measuring Outer Rotor Thickness
Fig. 139 Measuring Inner Rotor Thickness
Fig. 140 Measuring Outer Rotor Clearance in
Housing
1 – FEELER GAUGE
2 – OUTER ROTOR
Fig. 141 Measuring Clearance Between Rotors
1 – OUTER ROTOR
2 – FEELER GAUGE
3 – INNER ROTOR
DN 4.7L ENGINE 9 - 77
CLEANING AND INSPECTION (Continued)
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