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.
Intake valve (Two per cylinder) (Valve rotation ob-
tained with ROTOCOIL)
Lift at valve (with .015 in. lash) .5286 in.
Lift at cam-.360 in.
Lash (cold)-.018 in.
Lash (engine coolant at normal operating
temperature .015 in.
Head diameter ...............................................................
1.6190
1.6290
Length overall-7.3646 in.
Stem diameter ...............................................................
0.3715
0.3720
Minimum clearance between valve surface and
bottom deck of cylinder head ....................................
------------
------------
0.0640
Face angle-30
Intake valve seat inserts
Seat angle-30
Seat width-1/16 in.
Insert O.D. (not installed) ..............................................
1.6445
1.6455
Bore in cylinder head for insert ......................................
1.6415
1.6425
Fit in cylinder head-.0020 in. - .0040 in.
Run-out-.002 in. T.I.R.
Oversize insert- .005 in.
Oversize insert-.006 in. over standard
Intake valve guides
Length-3 7/8 in.
I.D. ream after assembly-ream in field-.373 in.
*Note. Intake guides installed in new pro-
duction and new factory service heads do not
require reaming in the field. They are factory
bearingized to .3735 in.-.3740 in. I. D. and
checked with a .3725 in. GO gage and a .3725
in. NO-GO gage, 4 in. long. Intake guides
installed in heads in the field must be reamed
after installation.
Valve stem-to-guide clearance-after reaming ................
------------
------------
0.0010
0.0015
Guide stand-out above flat surface of counterbore
in cylinder head .........................................................
------------
------------
0.7210
0.7360
Exhaust and intake valve springs
...................................................................................
Spring Only
Spring w/Damper
Free length ....................................................................
2 5/8 in.
2 5/8 in.
Length-valve closed .......................................................
2.200 in.
2.200 in.
Length-valve open .........................................................
1.656 in.
1.656 in.
Spring load at 2.200 in. .................................................
46-54 lb
50-63 lb
Spring load at 1.656 in. .................................................
123-133 lb
136-150 lb
Install new spring when old spring is 5% below the
low limit or 5% above the high limit.
Exhaust and intake valve bridge
Bore in bridge for guide pin ...........................................
0.4995
0.5000
Bridge-to-guide pin clearance ........................................
------------
------------
0.0020
0.0030
Guide pin length 3 5/16 in.
Guide pin O.D. ..............................................................
0.4970
0.4975
Guide pin gage height above cylinder head machined
surface-2 in.
Bore in head for bridge pin ............................................
0.4945
0.4960
Rocker arm shafts
Length-17 in.
O.D. ..............................................................................
1.2490
1.2500
8
