Cylinder Block/Crankcase Specifications; Piston Specifications - Mercury 25 EFI Service Manual

Cylinder Block/Crankcase

Cylinder Block/Crankcase Specifications

Number of cylinders
Displacement
Standard bore
Standard bore (service limit)
Cylinder bore maximum taper (service limit)
Cylinder bore maximum out of round (service limit)
Crankshaft main bearing journal
Crankshaft main bearing journal (service limit)
Crankshaft pin journal
Crankshaft pin journal (service limit)
Crankshaft end play
Crankshaft runout
Crankshaft runout (service limit)
Crankshaft main bearing oil clearance
Crankshaft main bearing oil clearance (service limit)
Crankshaft pin bearing oil clearance
Crankshaft pin bearing oil clearance (service limit)
Connecting rod wrist pin bore diameter
Connecting rod wrist pin bore diameter (service limit)
Connecting rod crankshaft pin diameter
Connecting rod crankshaft pin diameter (service limit)
Connecting rod side clearance
Connecting rod side clearance (service limit)

Piston Specifications

Piston skirt standard diameter
Piston skirt standard diameter (service limit)
Piston to bore clearance
Wrist pin diameter
Wrist pin diameter (service limit)
Top ring side clearance
Top ring side clearance (service limit)
Second ring side clearance
Second ring side clearance (service limit)
Oil ring side clearance
Oil ring side clearance (service limit)
Top ring end gap
Top ring end gap (service limit)
Second ring end gap
Second ring end gap (service limit)
Oil ring end gap
Lubricants, Sealants, Adhesives
Tube Ref No.
Loctite 567 PST Pipe
9
Sealant
Page 4A-2
Cylinder Block/Crankcase Specifications
Description
© 2016 Mercury Marine
Piston Specifications
0.020–0.055 mm (0.0008–0.0022 in.)
Where Used
Oil pressure switch threads
Water temperature sender threads
3
526 cc (32.09 cu. in.)
61.0 mm (2.4016 in.)
61.06 mm (2.4039 in.)
0.08 mm (0.0032 in.)
0.06 mm (0.0024 in.)
35.99 mm (1.4169 in.)
35.97 mm (1.4161 in.) or less
29.98 mm (1.1803 in.)
29.95 mm (1.179 in.) or less
0.05–0.15 mm (0.002–0.006 in.)
Less than 0.05 mm (0.002 in.)
0.05 mm (0.002 in.) or more
0.012–0.044 mm (0.0005–0.0017 in.)
0.06 mm (0.002 in.) or more
0.010–0.036 mm (0.00037–0.00142 in.)
0.060 mm (0.002 in.) or more
16.01–16.04 mm (0.630–0.631 in.)
16.04 mm (0.631 in.) or more
29.995–30.021 mm (1.1809–1.1819 in.)
30.023 mm (1.182 in.) or more
0.1–0.25 mm (0.004–0.01 in.)
0.6 mm (0.0236 in.)
60.96 mm (2.40 in.)
60.90 mm (2.3976 in.)
16.0 mm (0.63 in.)
15.97 mm (0.629 in.)
0.04–0.08 mm (0.0016–0.0031 in.)
0.1 mm (0.004 in.)
0.03–0.07 mm (0.0012–0.0028 in.)
0.09 mm (0.0035 in.)
0.05–0.15 mm (0.002–0.0059 in.)
0.17 mm (0.0067 in.)
0.15–0.30 mm (0.0059–0.0118 in.)
0.5 mm (0.02 in.)
0.35–0.50 mm (0.0138–0.0197 in.)
0.7 mm (0.028 in.)
0.2–0.7 mm (0.008–0.028 in.)
90-8M0105568 eng MARCH 2016
Part No.
92-809822