TM 5-6115-400-35
Table 1. Engine Repair and Replacement Standards-Continued
Manufacturer'
s
Maximum
Component
dimensions and
Desired
allowable
tolerance in
clearance
wear and
inches
clearance
Min.
Max.
Min.
Max.
Length ..........................................................................
1.6750
1.6850
Undersize bearings available for service .......................
.10 in., .020 in., .030 in., .040 in.
Standard wall thickness ................................................
0.12395
0.12446
Connecting rods
Type-Balanced Forging
Connecting rod length (center-to-center) .......................
11.9980
12.0020
I.D. of connecting rod bushing (finished bore) ..............
2.0027
2.0033
O.D. of connecting rod bushing ....................................
2.2525
2.2545
Bearing bore (less bearing, cap in place, and nuts
tightened to specified torque .....................................
3.6246
3.6250
Connecting rod width at lower end ................................
2.1175
2.1195
End play at crankshaft end ............................................
------------
------------
0.0040
0.0090
Piston pin bushing length in connecting rod ..................
1.8650
1.8860
Piston pin-to-connecting rod bushing clearance ...........
------------
------------
0.0010
0.0018
Torque for tightening connecting rod cap nuts-
190-200 ft. lb.
Bore in connecting rod for piston pin bushing ...............
2.2490
2.2500
Exhaust valves (Two per cylinder) (Valve rotation
obtained with ROTOCOIL)
Lift at valve (with .020 in. lash)-.5236 in.
Lift at cam .360 in.
Lash (cold)-.023 in.
Lash (engine coolant at normal operating
temperature-.020 in.
Head diameter ...............................................................
1.5830
1.5930
Length overall-7.3645 in.
Stem diameter ...............................................................
0.3715
0.3729
Minimum clearance between valve surface and
bottom deck of cylinder head ....................................
------------
------------
0.0640
Face angle 45
Exhaust valve seat inserts
Seat angle 45
Seat width-3/32 in.
Insert O.D. (not installed) ..............................................
1.6105
1.6110
Bore in cylinder head for insert ......................................
1.6075
1.6085
Fit in cylinder head .0020 in. -.0035 in.
Run-out-.002 in. T.L.R.
Oversize insert.005 in. over standard
Exhaust valve guides
Length-3-7/8 in.
I.D.-ream in field .374 in.
*NOTE: Exhaust guides installed in new
production and new factory service heads do not
require reaming in the field. They are factory
bearingized to .3742 in. - .3747 in. I.D. and
checked with a .3732 in. GO gage and a .3742 in.
NO-GO gage, 4 in. long. Exhaust guides installed
in heads in the field must be reamed after
installation.
Valve stem-to-guide clearance-after reaming ................
------------
------------
0.0020
0.0025
Guide stand-out above flat surface of counterbore
in cylinder head .........................................................
------------
------------
1.3460
1.3610
7
