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Mercury 40 FourStroke - Piston Pin; Piston Rings

Mercury 40 FourStroke
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CYLINDER BLOCK/CRANKCASE
Page 4B-1990-857046R1 NOVEMBER 2001
Piston Pin
1. Measure piston pin diameter. Replace piston pin if out of specification.
55839
Piston Pin Diameter
0.6285 - 0.6287 in. (15.965 - 15.970 mm)
1. Place the piston pin into the connecting rod and check for free play. There should be no
noticeable free play.
55840
2. Place the piston pin into the piston and check for free play. There should be no notice-
able free play.
55841
Piston Rings
PISTON RING SIDE CLEARANCE
1. Measure piston ring side clearance. Replace piston and/or piston rings if out of specifi-
cation.
55842
Piston Ring Side Clearance
Top 0.0008 - 0.0024 in. (0.02 - 0.06 mm)
Middle 0.0008 - 0.0024 in. (0.02 - 0.06 mm)

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