Piston Specifications; Oil System Specifications; Cylinder Head Specifications - Mercury 25 EFI Service Manual

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

Oil System Specifications

Oil pump type
Oil type
All temperatures
Alternate viscosity above 4 °C (40 °F)
Oil capacity
Engine oil pressure at 75 °C (167 °F)
at 850 RPM
at 5000 RPM
Oil pump housing inside diameter (service limit)
Outer rotor to oil pump housing inside diameter clearance (service limit)
Outer rotor height (service limit)
Rotor to oil pump cover clearance (service limit)
Inner rotor to outer rotor clearance (service limit)

Cylinder Head Specifications

Maximum deck warp
Number of valves
Number of valves per cylinder
Number of cams
Camshaft bearing outside diameter
Pulley side
Pulley side (service limit)
Oil pump side
Oil pump side (service limit)
Cam lobe height
(25) Intake and exhaust
(25) Intake and exhaust (service limit)
90-8M0105568 eng MARCH 2016
Piston Specifications
Oil System Specifications
Cylinder Head Specification
© 2016 Mercury Marine
Master Specifications
60.96 mm (2.40 in.)
60.90 mm (2.3976 in.)
0.020–0.055 mm (0.0008–0.0022 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.)
Trochoid
FC‑W 10W30
FC‑W 25W40
1.8 liter (1.9 U.S. qt)
150 kPa (21 psi) or greater
300 kPa (42 psi) or greater
40.8 mm (1.606 in.)
0.25 mm (0.01 in.)
14.96 mm (0.589 in.)
0.11 mm (0.0043 in.)
0.16 mm (0.006 in.)
0.1 mm (0.004 in.)
6
2
1
17.98 mm (0.708 in.)
17.95 mm (0.707 in.)
15.97 mm (0.629 in.)
15.95 mm (0.628 in.)
23.87 mm (0.9398 in.)
23.60 mm (0.9291 in.)
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