Overhead Set (003-004)
B3.9 and B5.9 Series Engines
Section 3 - Rocker Levers - Group 03
When the timing pin engages in the hole in the camshaft
gear, cylinder No. 1 is at TDC on the compression stroke.
To avoid engine or timing pin damage, you must dis-
engage the timing pin after locating TDC.
Remove the valve cover
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