TM 55-1930-209-14&P-21
b.
Installation
(1)
Install upper grooved bearing shells in cylinder block.
(2)
Apply clean engine oil to crankshaft journals. Attach a rope or strap sling to a suitable hoist and lower
crankshaft into position. Make sure timing marks on crankshaft gear match idler gear timing marks.
(3)
Check backlash with mating gear. Backlash must be . 003 to . 008 inch and a maximum of . 007 inch on
used gears.
(4)
Install upper bearing thrust washer halves on each side of rear bearing shell. Install lower doweled thrust
washer halves in each side of rear main bearing cap.
(5)
Install lower shells in caps. Install caps in their original position on crankshaft. Lubricate the cap bolt
threads and head contact areas with a suitable compound before installation. Draw bolt up snug. Then, tap bearing caps
lightly with a soft hammer to seat properly. Tighten cap bolts, starting with the center bolts and working alternately
towards both ends of block.
(6)
Rotate crankshaft to make sure it rotates freely.
(7)
Check crankshaft end play as illustrated in Figure 6-32. Move crankshaft toward gage and keep constant
pressure on tool. Set dial indicator to zero. Then, remove and insert screwdriver on other side of bearing cap. Force
screwdriver in opposite direction and note amount of end play on dial. The clearance must be 0. 004 to 0. 011 inch with
new parts and a maximum of 0. 018 inch with used parts.
(8)
Install pistons and connecting rods (para 6-34).
(9)
Install crankshaft from cover and pulley in reverse of disassembly sequence.
(10)
Install flywheel housing.
(11)
Install oil pump inlet assembly and pan (para 6-21).
(12)
Install cylinder head (para 6-17).
(13)
Install engine assembly.
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