Table 4-1. Engine Repair and Replacement Standards

Table 4-1. Engine Repair and Replacement Standards

Manufacturer's

Maximum

dimensions and

allowable

tolerances in inches

Desired clearance

wear and

Maximum

Minimum

Maximum

Minimum

clearance

VALVES

Valve seat angle:

Intake-45

Exhaust-45

Stem diameter:

Intake ................................ ...........................

0.4335

0.4345

-----

0.4315

Exhaust ................................ ........................

0.4325

0.4335

-----

0.4305

Stem-to-guide clearance:

-----

Intake ................................ ...........................

-----

0.0008

0.0028

0.0048

(0.002 desired)

Exhaust................................ .........................

-----

0.0045

0.0065

0.0085

VALVE GUIDES

(0.005 desired)

Length

3.000

Outside diameter

0.745

0.755

Stem hole diameter:

Intake ................................ ............................

0.4353

0.4363

-----

0.4373

Exhaust ................................ ........................

0.4380

0.4390

-----

0.4400

Distance from face of valve seat to valve guide:

Intake ................................ ...........................

-----

1.625

Exhaust ................................ ........................

-----

1.8125

VALVE SPRINGS

Outside diameter:

Outer spring ................................ ..................

-----

1.820

Inner spring ................................ ..................

-----

1.655

Length-valve closed:

Outer spring ................................ ..................

-----

2.117

Inner spring ................................ ..................

-----

1.867

Load-valve closed:

Outer spring ................................ ..................

63 lb

71 lb

-----

60 lb

Inner spring ................................ ...................

35 lb

41 lb

-----

34 lb

Length-valve open:

Outer spring ................................ ..................

-----

1.427

Inner spring ................................ ...................

-----

1.367

Load-valve open:

Outer spring ................................ ..................

153 lb

167 lb

-----

1601b

Inner spring ................................ ...................

83 lb

94 lb

-----

81 lb

TIMING GEARS

Crankshaft gear-to-camshaft gear clearance......

-----

0.0015

0.002

0.003

CAMSHAFT

Journal diameter (all) ................................ .........

2.122

2.1225

-----

2.121

Bushing inside diameter (all) ..............................

2.1240

2.1245

Bushing-to-journal clearance..............................

-----

0.0015

0.0025

Camshaft end play................................ .............

-----

0.005

0.009

PISTON RINGS

Ring width:

No. 1 compression ................................ ........

0.0925

0.0935

-----

0.0905

No. 2 and No. 3 compression ........................

0.1250

0.1240

-----

0.1210

No. 4 oil................................ .........................

0.2480

0.2490

-----

0.2460

Ring side clearance:

No. 1 compression ................................ ........

0.0035

0.0055

No. 2 and No. 3 compression ........................

0.0025

0.0045

No. 4 oil................................ .........................

0.002

0.004

Ring gap clearance (all) ................................ .....

0.017

0.032

4-2