(4) Tighten head bolts evenly to ensure a tight cylinder head joint. Use head bolt wrench 41–W–1525, first turning down bolts just snug, then tightening each bolt 1⁄8 to ¼ turn at a time, until all are securely tightened. If torque wrench is available, tighten head bolts to 60 foot‐pounds minimum, 65 foot‐pounds maximum tension when engine is cold.
42. CARBON REMOVAL.
a. At time cylinder head is removed for gasket replacement, carbon must be removed from head only.
43. VALVE TAPPET ADJUSTMENT ([fig. 16]).
a. Adjust Tappets with Engine Cold. Before loosening valve spring covers, a light application of oil around top edge of each cover will facilitate raising cover without damage to seal packing.
(1) Loosen valve spring covers; use tappet and valve cover wrench 41–W–3617.
(2) Before checking or adjusting tappet clearance, make sure valve is seated and that tappet is at lowest position, by turning engine ahead until like tappet (inlet or exhaust, whichever one is being adjusted) in the other cylinder is at highest position (valve fully open). Inlet valves are located nearest the carburetor manifold.
RA PD 310211
Figure 16—Valve Tappet Adjustment