TM 5-4310-379-14
(c)
If measurements of block bores do not meet specifications for diameter, taper and out-of-round or if liner-to-block
clearance is greater than .003 in. (.007 cm), the bores must be increased for oversize liners as shown in table 5-
6.
Table 5-6.
Cylinder Block Bores for Various
Liners
Max. Allowable
Liner O.D.
Block Bore
Block Boring Dimensions
CAST IRON BLOCK
4.626-.001 in. (11.750-.002 cm)
4.627 in. (11.752 cm)
4.627 .0005 in. (11.750 .0012 cm)
4.627-.001 in. (11.752-.002 cm)
4.628 in. (11.755 cm)
4.628 .0005 in. (11.755 .0012 cm)
4.631-.001 in. (11.762-.002 cm)
4.632 in. (11.765 cm)
4.632 .0005 in. (11.765 .0012 cm)
4.636-.001 in. (11.775-.002 cm)
4.637 in. (11.777 cm)
4.637 .0005 in. (11.777 .0012 cm)
4.646-.001 in. (11.800-.002 cm)
4.647 in. (11.803 cm)
4.647 .0005 in. (11.803 .0012 cm)
4.656-.001 in. (11.826-.002 cm)
4.657 in. (11.828 cm)
4.657 .0005 in. (11.828 .0012 cm)
(15)
Check main bearing bores as follows:
(a)
Install main bearing caps in their original position and torque bolts to 165-175 Ib-ft (224-238 N
m).
NOTE
Bearing bores must be 3.812-3.813 in. (9.682-9.685 cm).
(b)
Measure bearing bores, if bores do not fall within these limits, replace cylinder block.
(c)
Check main bearing bores for alinement. Bearing bores may be considered properly alined with one
another if a crankshaft with standard size journals can be rotated freely by hand, after new main
bearing shells have been installed and lubricated.
(d)
If a main bearing bore is more than .001 in. (.002 cm) out of alinement, block must be replaced.
(16)
Inspect camshaft and balance shaft bearings in block for signs of scoring and wear. If bearings are scored
or worn excessively, the bearings must be replaced.
(17)
Inspect cylinder block surfaces and thread holes.
(18)
Inspect all the mating surfaces, or mounting pads, for flatness, nicks, and burrs.
(19)
Check dowels at the rear of block. Dowels must extend 5/8 inches from face of block.
(20)
Check that dowels used to retain crankshaft thrust washers on the rear main bearing cap extend .110-.120
in. (.279-.304 cm) from surface of bearing cap.
5-103/(5-104 blank)
