Parameter Specification
Valve stem diameter
Intake 5.48 mm (0.216 in.)
Intake (service limit) 5.46 mm (0.215 in.)
Exhaust 5.46 mm (0.215 in.)
Exhaust (service limit) 5.44 mm (0.214 in.)
Cylindricity (maximum) 0.01 mm (0.0004 in.)
Valve face width (intake and exhaust) 1.0 mm (0.04 in.)
Valve face width (service limit) 2.0 mm (0.08 in.)
Valve margin thickness
Intake 0.55 mm (0.0217 in.)
Exhaust 1.00 mm (0.0394 in.)
Valve seat width 1.0 mm (0.04 in.)
Valve guide bore
Intake and exhaust 5.51 mm (0.217 in.)
Intake valve guide bore (service limit) 5.55 mm (0.218 in.)
Exhaust valve guide bore (service limit) 5.57 mm (0.219 in.)
Valve stem to valve guide
clearance
Intake
0.008–0.04 mm
(0.0003–0.0016 in.)
Intake (service limit) 0.07 mm (0.0028 in.)
Exhaust
0.025–0.057 mm
(0.001–0.0022 in.)
Exhaust (service limit) 0.1 mm (0.004 in.)
Rocker arm shaft outside diameter 12.99 mm (0.511 in.)
Rocker arm shaft outside diameter (service limit) 12.94 mm (0.509 in.)
Rocker arm inside diameter 13.01 mm (0.512 in.)
Rocker arm inside diameter (service limit) 13.05 mm (0.514 in.)
Rocker arm shaft clearance
0.006–0.035 mm
(0.00023–0.0014 in.)
Cylinder head upper camshaft bearing inside diameter
17.975–17.990 mm
(0.7077–0.7083 in.)
Oil pump camshaft bearing inside diameter
15.965–15.980 mm
(0.6285–0.6291 in.)
Valve stem seal color
Intake Black
Exhaust Green
Oil System Specifications
Parameter Specification
Oil pump type Trochoid
Oil type All temperatures FC‑W® 10W‑30
Alternate viscosity above 4 °C (40 °F) FC‑W® 25W‑40
Oil capacity 1.0 L (1.1 U.S. qt)
Engine oil pressure at 75 °C
(167 °F)
At 950 RPM 50 kPa (7.3 psi) or greater
At 5000 RPM 100 kPa (14.5 psi) or greater
Oil pump housing inside diameter (service limit) 29.15 mm (1.148 in.)
Outer rotor to oil pump housing inside diameter clearance (service limit) 0.18 mm (0.007 in.)
Outer rotor height (service limit) 14.96 mm (0.589 in.)
Rotor to oil pump cover clearance (service limit) 0.11 mm (0.004 in.)
Inner rotor to outer rotor clearance (service limit) 0.13 mm (0.005 in.)
Specifications
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 1A-5
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