Table 1-1. Repair and Replacement Standards

TM 10-3930-242-34

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PISTON PINS1

Diameter ---------------- ------------------------------------------------------------------------

1.3746"

1.3750"

Clearance-Pin-to-Piston Bushing -----------------------------------------------

0.0025"

0.0034"

0.010"

Clearance-Pin-to-Rod Bushing --------------------------------------------------

0.0010"

0.0019"

0.010"

PISTON RINGS

Compression Rings

Gap (Chrome ring) -----------------------------------------------------

0.0200"

0.0460"

0.060"

Gap (Cast iron ring) ---------------------------------------------------

0.0200"

0.0360"

0.060"

Clearance-Ring-to-Groove

Top(No.1)--------------------------------------------------------------------------------

0.0030"

0.0060"

0.012"

No.2-----------------------------------------------------------------

0.0070"

0.0100"

0.014"

No.3 and 4 (21:1 Piston) ------------------------------------------------

0.0045"

0.012"

0.0070"

Oil Rings

Gap ------------------------------------------------------------------

0.100"

0.0250"

0.044"

Clearance-Ring-to-Grove

----------------------------------------------

0.0015"

0.0055"

0.008"

CONNECTING RODS

Length-Center-to-Center ---------------------------------------------------------

8.7990"

8.8010"

Lower Bore --------------------------------------------------------------------------

2.7515"

2.7525"

U p p e r Bore-Diameter --------------------------------------------------

1.6000"

1.6010"

Bushing Inside Diameter -----------------------------------------------------------

1.3765"

1.3760"

Normal Rod Side Clearance -------------------------------------------------------

0.0060"

0.0120"

CRANKSHAFT 2

Journal Diameter-Main Bearing ---------------------------------------------------

3.000"

2.9990"

Journal Diameter-Connecting Rod ---------------------------------------

2.4990"

2.5000"

Journal Out-of-Round ----------------------------------------------------

0.00025"

J o u r n a l Taper ----------------------------------------------------------

0.0030"

0.0005"

Runoutat Journal-Total Indicator Reading 4-53 ----------------------------

0.0020"

Thrust Washer Thickness ------------------------------------------------

0.1205"

0.1220"

End Thrust Clearance ---------------------------------------------------------------

0.0040"

0.0180"

0.1100"

MAIN BEARINGS

Bearing Inside Diameter (Vertical Axis) ------------------------------------

3.0030"

3.0020"

Bearing Thickness-90 from Parting Line ---------------------------------

0.1250"

0.1245"

0.1230"

Clearance-Bearing-to-Journal

-------------------------------------------

0.0040"

0.0060"

0.0010"

CONNECTING ROD BEARINGS1

Bearing Inside Diameter (Vertical Axis -----------------------------------

2.5035"

2.5015"

Bearing Thickness-90 from Parting Line ---------------------------------

0.1230"

0,1250"

0.1245"

Clearance-Bearing-to-Crankshaft Journal --------------------------------

0.0045"

0.0015"

0.0060"

CYLINDER HEAD 1

Cam Follower Bore-Current ---------------------------------------------

See Cam Fol-

1.0636"

1.0626"

ler Clear-

Cam Follower Bore-Former ---------------------------------------------

1.0630"

1.0620"

ance

Exhaust Valve Seat Insert Counterbore Diameter --------------------------

1.1600"

1.1590"

VALVE SEAT INSERTS1

Outside Diameter -------------------------------------------------------------------

1.1615"

1.1605"

5/64"

5/62"

Seat Width --------------------------------------------------------------------------

3/64"

0.0020"

V a l v e Seat Runout ------------------------------------------------------

EXHAUST VALVES 1

See Guide

0.2485"

Stem Diameter Former --------------------------------------------------

0.2475"

Clearance

0.2488"

See Guide

S t e m Diameter ----------------------------------------------------------

0.2480"

Clearance

VALVE GUIDES 1

Distance Below Top of Head (Plain Guide) ---------------------------------

0.0100"

0.0400"

Distance Below Top of Head (Guide Machined for Oil Seal) ------------------

0.1900"

0.2200"

0.2505"

0.2515"

Diameter-Inside ------------------------------------------------------------------

Clearance-Stem-to-Guide

0.0050"

0.0020"

0.0040"

Former

-----------------------------------------------------------------------------------

0.0050"

0.0035"

0.0017"

Current ----------------------------------------------------------------------------------------

ROCKER ARMS AND SHAFTS1

0.8735"

0.8740"

Rocker Arm Shaft Diameter ----------------------------------------------

0.8760"

Injector Rocker Arm Bushing Inside Diameter -------------------------------

0.8750"

Diameter of Bore in Exhaust Valve Rocker Arm for Rocker Arm Shaft -------

0.8753"

0.8763"

0.0040"

0.0025"

Clearance-Shaft-to-Injector Rocker Arm Bushing -------------------------

0.0010"

1-4