mercury Workshop Repair Guides

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Piston, Engine|Specifications|Page 3102 > < Harmonic Balancer|Page 3098
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Piston: Specifications

* Diameter: 

Grade 1, Coated ......................................................................................................................................  88.990-89.010 mm (3.50354-3.50432 inch)
Grade 2, Coated ......................................................................................................................................  88.998-89.022 mm (3.50386-3.50480 inch)
Grade 3, Coated ......................................................................................................................................  89.010-89.030 mm (3.50432-3.50511 inch)
Grade 1, Uncoated ..................................................................................................................................  88.970-88.980 mm (3.50257-3.50314 inch)
Grade 2, Uncoated ..................................................................................................................................  88.978-88.992 mm (3.50306-3.50362 inch)
Grade 3, Uncoated ..................................................................................................................................  89.010-89.030 mm (3.50432-3.50511 inch)

Piston-to-Bore Clearance ...................................................................................................................................  0.012-0.022 mm (0.0005-0.0009 inch)
Piston Pin Bore ................................................................................................................................................  21.008-21.012 mm (0.8270-0.8272 inch)
Ring Groove Width: 

Compression, Top ...........................................................................................................................................  1.230-1.245 mm (0.0484-0.0490 inch)
Compression, Bottom ......................................................................................................................................  1.530-1.545 mm (0.0602-0.0608 inch)
Oil ...................................................................................................................................................................  3.030-3.055 mm (0.1192-0.0120 inch)

Measured at 50 mm (2 inch) from outer perimeter top of piston to the pin axis.

Piston, Engine|Specifications|Page 3102 > < Harmonic Balancer|Page 3098