Specifications - Mercury 40 FourStroke Service Manual

CYLINDER BLOCK/CRANKCASE

Specifications

Type
CYLINDER
Displacement
BLOCK
Number of Cylinders
STROKE Length
Diameter
CYLINDER
BORE
Taper/Out of Round Maximum
Bore Type
Piston Type
O.D. at Skirt
PISTON
PISTON Piston to Cylinder Clearance
CLEARANCE
Ring End Gap (Installed)
RINGS
Side Clearance:
Compression Ratio
Cylinder Compression*
COMPRESSION
(Electric Models Only, Cold Engine @
RATIO
W.O.T.)
PISTON PIN Piston Pin Diameter
CONNECTING Oil Clearance (Big End)
ROD Small End Inside Diameter
Main Bearing Clearance
CRANKSHAFT
Crankshaft Run-out
Page 4B-2
Standard
Oversize-0.010 in. (0.25 mm)
Oversize-0.020 in. (0.50 mm)
Standard
Oversize-0.010 in. (0.25 mm)
Oversize-0.020 in. (0.50 mm)
Top
Middle
Bottom (Oil Ring)
Top
Middle
4 Stroke Cycle – Over Head Camshaft
45.6 cu. in. (747 cc)
3
2.953 in. (75 mm)
2.5591 in. (65 mm)
2.5689 in. (65.25 mm)
2.5787 in. (65.5 mm)
0.003 in. (0.08 mm)
Cast Iron
Aluminum
2.5570 - 2.5578 in. (64.950 - 64.965 mm)
2.5669 - 2.5675 in. (65.2 - 65.215 mm)
2.5768 - 2.5774 in. (65.450 - 65.465 mm)
0.0014 - .0026 in. (0.035 - 0.065 mm)
0.006 - 0.012 in. (0.15 - 0.03 mm)
0.012 - 0.020 in. (0.30 - 0.50 mm)
0.008 - 0.028 in. (0.20 - 0.70 mm)
0.0008 - 0.0024 in. (0.02 - 0.06 mm)
0.0008 - 0.0024 in. (0.02 - 0.06 mm)
9.8:1
180 - 210 psi (Peak)
0.6285 - 0.6287 in. (15.965 - 15.970 mm)
0.0008 - 0.0020 in. (0.020 - 0.052 mm)
0.6293 - 0.6298 in. (15.985 - 15.998 mm)
0.0005 - 0.0017 in. (0.012 - 0.044 mm)
0.0018 in. (0.046 mm)
90-857046R1 NOVEMBER 2001