Crankshaft Timing Gear
Inspect the crankshaft timing gear and key. Replace if damaged or worn.
3117
Timing Belt
Inspect the timing belt. Replace if worn, stretched, or damaged.
3118
Anode
Replace the engine water jacket anode if partially consumed.
Measuring Cylinder Bore
Measure the cylinder walls for taper, out of round, or excessive ridge at the top of the ring travel. This should be done with a
cylinder bore dial indicator or an inside micrometer. Carefully move the gauge up and down the cylinder bore to determine
taper. Turn the gauge to different points around the cylinder wall to determine the out of round condition.
The measurement for cylinder taper should be taken at three depth locations: 15 mm (0.6 in.), 35 mm (1.4 in.), and 55 mm
(2.2 in.).
a - 55 mm (2.2 in.)
b - 35 mm (1.4 in.)
c - 15 mm (0.6 in.)
Cylinder Bore
Cylinder bore (standard) 61.00 mm (2.4016 in.)
Cylinder bore (service limit) 61.06 mm (2.4039 in.)
Out of round (service limit) 0.06 mm (0.0023 in.)
Taper (service limit) 0.08 mm (0.0032 in.)
Piston Measurements
Inspect piston wall for wear or damage. Replace the piston if necessary.
Cylinder Block/Crankcase
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4A-17
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