Mercury FourStroke 3.5 User Manual

Powerhead
Page 4A-26 90-8M0065421 NOVEMBER 2012
Piston
Outside diameter (standard) 54.96 mm (2.1638 in.)
Outside diameter (service limit) 54.90 mm (2.1614 in.)
Clearance (standard) 0.02–0.06 mm (0.00078–0.00236 in.)
Clearance (service limit) 0.15 mm (0.0059 in.)
3. To determine a piston to cylinder wall clearance, use this formula:
• Minimum cylinder bore measurement – maximum piston diameter measurement = piston to cylinder wall clearance.
Piston Pin
1. Measure the piston pin.
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Piston Pin
Inside diameter (standard) 14.0 mm (0.5512 in.)
Inside diameter (service) 13.97 mm (0.550 in.)
2. Place the piston pin into the connecting rod and check for free play. There should be no noticeable free play. Replace the
pin and/or the connecting rod as necessary.
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3. Place the piston pin into the piston and check for free play. There should be no noticeable free play. Replace the pin and/or
the piston as necessary.
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Mercury FourStroke 3.5 Specifications

General

Brand	Mercury
Model	FourStroke 3.5
Category	Outboard Motor
Language	English