TM 5-3805-262-343-1. ENGINE MAINTENANCE (CONT)a. Engine Tune-up (SHEET 4 OF 21).(2) Top Dead Center Check (Cont).(k)(1)(m)(n)Crank engine counterclockwise un-til both scribe marks are visible.Using divider, locate half thedistance between the two scribemarks. If this mid-point does notaline with the TDC (Top Dead Cen-ter) mark on crankshaft pulley,replace crankshaft pulley(page 3-51).Remove dial indicator.Position spring seat on cylinderhead, flat side down.Install spring with either endon spring seat.(o) Install valve rotator on spring, flat side up.(p) Compress exhaust valve spring using valve spring compressor tool, in-stall two valve keepers in top groove of valve stem, and remove valvespring compressor tool.(q) Tap end of valve stem using soft hammer to seat valve keepers.(r) Install rocker arm assembly on No. 1 cylinder head (page 3-71).(3) Valve Tappet Clearance Adjustment.Cold setting valve tappet clearancemust be adjusted whenever rocker armassembly or push rods have beenremoved. Do not start engine untilcold setting tappet clearanceadjustment has been performed.(a) Crank engine using wrench oncrankshaft pulley capscrew un-til TDC (Top Dead Center)timing mark on crankshaftpulley is alined with timingpointer.3-6
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