Table 1. Engine Repair and Replacement Standards-Continued

TM 5-6115-400-35

Table 1. Engine Repair and Replacement Standards-Continued

Manufacturer'

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.

Length-valve closed .......................................................

2.200 in.

Length-valve open .........................................................

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