NOTE: The ring must be level for measurement. Push the ring 4 mm (0.157 in.) into the bore with the crown of a piston.
a - 4 mm (0.157 in.)
Piston Ring End Gap
Top 0.15–0.30 mm (0.0059–0.0118 in.)
Top (service limit) 0.50 mm (0.020 in.)
Second 0.35–0.50 mm (0.0138–0.0197 in.)
Second (service limit) 0.70 mm (0.028 in.)
Oil 0.20–0.70 mm (0.008–0.028 in.)
Piston Wrist Pin
Measure the piston wrist pin diameter. Replace the piston wrist pin if out of specification.
Piston Wrist Pin
Diameter 15.996–16.000 mm (0.6298–0.6299 in.)
Diameter (service limit) 15.993 mm (0.6296 in.)
Connecting Rod Measurements
1.
Ensure the connecting rod cap fits perfect. Tighten the connecting rod cap bolts to the specified torque.
Description Nm lb‑in. lb‑ft
Connecting rod cap bolts 10.0 88.5 –
2. Measure the small (piston pin) and large (crankshaft pin journal) ends of the connecting rod.
a - Crankshaft pin journal end
b - Piston pin end
Cylinder Block/Crankcase
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4A-19
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