Inspection. - TM-55-1930-208-240308

TM 55-1930-208-24

NOTE

Use the unfinished bearing caps for the front and intermediate bearing positions. The finished bearing

caps, machined for the crankshaft thrust washers, are to be used in the rear bearing position.

(5) Main bearing bores are line-bored with the bearing caps in place and thus are in longitudinal alignment.

Bearing bores may be considered properly aligned with one another if the crankshaft can be rotated freely

by hand after new bearing shells have been installed and lubricated and the bearing caps have been

secured in place and the bolts tightened as specified. If a main bearing bore is more than .001 inch out of

alignment, the block must be replaced.

(6) Replace loose or damaged dowel pins.

(7) Replace damaged or broken cylinder head studs. Install and drive a new stud to a height of 4 3/8 inch

1/32 inch at a minimum of 75 lb-ft (102 Nn).

(8) Examine the tapped bolt holes for the cylinder head or main bearing cap bolts and, if the threads are

damaged, "clean-up" the threads or install a helical thread insert. The topped holes may be tapped with a

5/8 inch-11 UNC3B tap. All cylinder head bolt or stud holes must have the threads extending 1.84 inch

below the block surface.

(9) Check the drive pins (which plug vertical oil galleries) in the corners of the block to be sure they are flush

with or below the top surface of the block.

(10) Check the remaining cylinder block surfaces and threaded holes. Check all of the mating surfaces, or

mounting pads, for flatness, nicks, and burrs. The flatness of the blower mounting pad must not vary more

than .004 inch. Clean-up damaged threads in, tapped holes with a tap or install helical thread inserts, if

necessary.

(11) Install all internal engine components and engine accessories in accordance with paragraph 4-15 through

(12) Install engine per paragraph 3-15.

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