15 mm
Remove the valve cover.
1/2 Inch Drive, 3377371 Engine Barring Gear
Locate Top Dead Center (TDC) for Cylinder Number 1 by barring the crankshaft slowly while pressing on the engine timing pin.
When the timing pin engages in the hole in the camshaft gear, Cylinder Num ber 1 is at TDC on the compression
stroke.
NOTE: To prevent damage to the engine or timing pin, be sure to disengage the timing pin after locating TDC.
Feeler Gauge
Intake Clearance: 0.254 mm [0.010 in].
Exhaust Clearance: 0.508 mm [0.020 in].
Check/set valves with engine cold – below 60°C [14Q°F],
NOTE: The clearance is correct when some resistance is “felt” when the feeler gauge is slipped between the valve
stem and the rocker lever.
NOTE: Caution must be used when setting the exhaust valve lash on marine cylinder heads with rotators. The top of the valve stem is slightly recessed below the top of the valve rotator.
