Table 4-1. Repair and Replacement Standards-continued

Table 4-1. Repair and Replacement Standards-Continued

Manufacturer's

Maximum

dimensions and

allowable

Component

tolerances in inches

Desired clearance

wear and

clearance

Minimum

Maximum

Minimum

Maximum

Rocker arms

Running clearance

.0015

.0035

Governor

Backlash

.002

.003

Exhaust valve

insert O.D.

1.628

1.629

Bore in Cylinder Head

1.624

1.625

Counterbore Depth

.229

.232

Valve, valve spring and valve

guides

Valve lift intake and exhaust

1 1/32

Dia. of intake and exhaust

valve head

1 1/2

Valve stem clearance in

guide intake

.0015

.0035

Valve stem clearance in

guide exhaust

.0025

.0045

Valve stem dia.-intake and

exhaust

.3405

.3415

Valve spring free length

2 15/32

Valve closed spring length

1 15/16

Compressed Pressure

49 lbs.

Valve open spring length

1 19/32

Compressed Pressure

86 lbs.

Valve running clearance cold

Intake

.007

.009

Exhaust

.021

.023

4-3