TM 5-2420-230-24-2
Overhead Set (003-004)
B3.9 and B5.9 Series Engines
Page 3-4
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.
CAUTION
To avoid engine or timing pin damage, you must dis-
engage the timing pin after locating TDC.
15 mm
Remove the valve cover
Feeler Gauge
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.
Intake Clearance:
0.254 mm
[0.010 in]
Exhaust Clearance:
0.508 mm
[0.020 in]
L-832
