TM 5-4310-354-14
Table 5-2. Repair and Replacement Standards - Continued
Maximum
New parts
allowable
Component
wear/
clearance
Minimum
Maximum
ENGINE - continued
Camshaft:
Bearing journal diameter, all ...................................................................................
2.053 in.
2.054 in.
0.002 in.
(52.146 mm)
(52.172 mm)
(0.0508 mm)
Lobe diameter, base to tip ......................................................................................
1.720 in.
1.725 in.
0.010 in.
(43.688 mm)
(43.815 mm)
(0.254 mm)
Journal run-out (in vee blocks)...............................................................................
0.001 in.
0.004 in.
(0.0254 mm)
(0.102 mm)
Bearing clearance ...................................................................................................
0.0015 in.
0.0035 in.
0.0060 in.
(0.0381 mm)
(0.0889 mm)
(0.1524 mm)
End thrust .................................................................................................................
0.005 in.
0.008 in.
0.012 in.
(0.127 mm)
(0.203 mm)
(0.305 mm)
Back lash, camshaft-to-crankshaft gear ..............................................................
0.0015 in.
0.0025 in.
(0.0381 mm)
(0.0635 mm)
Piston:
Clearance in cylinder bore, all
(With newly honed bores and new pistons. Pull on 1/2x0.005-in. ribbon.)
5 pounds
8 pounds
(2.27 kilograms)
(3.63 kilograms)
Piston pin bore .........................................................................................................
1.2500 in.
1.2502 in.
0.0010 in.
(31.7500 mm)
(31.7551 mm)
(0.0254 mm)
Width of ring groove, top, Keystone .....................................................................
1/8-in. nom
(3.175 mm)
Width of ring groove, 2nd .......................................................................................
0.0975 in.
0.0990 in.
0.0050 in.
(2.4765 mm)
(2.5146 mm)
(0.127 mm)
Width of ring groove, oil control ............................................................................
0.1880 in.
0.1895 in.
0.0050 in.
(4.7752 mm)
(4.8133 mm)
(0.127 mm)
Piston Pin:
Length .......................................................................................................................
3.035 in.
3.040 in.
(77.089 mm)
(77.216 mm)
Diameter ...................................................................................................................
1.2498 in.
1.2499 in.
0.0020 in.
(31.7449 mm)
(31.7475 mm)
(0.0508 mm)
Clearance in piston .................................................................................................
0.0000 in.
0.0005 in.
0.0020 in.
(0.0000 mm)
(0.0127 mm)
(0.0508 mm)
Clearance in connecting rod ..................................................................................
0.0005 in.
0.0012 in.
0.0050 in.
(0.0127 mm)
(0.0305 mm)
(0.1270 mm)
Piston Rings:
Clearance in groove, top ........................................................................................
Keystone taper
Clearance in groove, 2nd .......................................................................................
0.0040 in.
0.0060 in.
0.0080 in.
(0.1016 mm)
(0.1524 mm)
(0.2032 mm)
Clearance in groove, oil control ............................................................................
0.0015 in.
0.0030 in.
0.0080 in.
(0.0381 mm)
(0.0762 mm)
(0.2032 mm)
Ring gap ...................................................................................................................
0.0100 in.
0.0200 in.
0.0400 in.
(0.254 mm)
(0.508 mm)
(1.016 mm)
Intake Valves:
Head diameter .........................................................................................................
1.6825 in.
1.6925 in.
(42.7355 mm)
(42.9895 mm)
Stem diameter .........................................................................................................
0.3725 in.
0.3735 in.
0.0025 in.
(9.4615 mm)
(9.4869 mm)
(0.0635 mm)
Stem-to-guide clearance ........................................................................................
0.0005 in.
0.0025 in.
0.0050 in.
(0.0127 mm)
(0.0635 mm)
(0.1270 mm)
Stem-to-rocker arm clearance, hot .......................................................................
0.0150 in.
(0.381 mm)
Seat diameter in head ............................................................................................
1.647 in.
1.653 in.
(41.834 mm)
(41.986 mm)
Seat width in head ..................................................................................................
5/64-in.
1/8-in.
(1.9844 mm)
(3.175 mm)
5-15
