Operating instructions

6-2 MARCH 1982
areas. Inspect all studs for possible bending,
looseness or partial removal. Inspect all threaded
parts for nicks and other damage to the screw threads.
After visual inspection the engine parts should be in
three groups: Apparently serviceable parts, repairable
parts and parts to be discarded.
6-5. MAGNETIC PARTICLE INSPECTION.
Inspection by the Magnaflux method must be
conducted on all ferrous parts listed in Table XI, and
in accordance with the methods and data in the table
before dimensional inspection. The Magna-glow
method is recommended whenever the necessary
equipment is available. This method employs
magnetic particles coated with a fluorescent organic
material which may be illuminated with a "black
light", as in the Zyglo process, to amplify weak
indications. If a crankshaft is doubtful after a circular
magnetization and inspection, demagnetize and
remagnetize it longitudinally for further inspection.
NOTE
Before magnetic particle inspection, piston pins and
valve rocker shafts must be polished with crocus
cloth.
CAUTION
Before magnetic particle inspection of any part, plug
small holes leading to obscure cavities with tight-
fitting wood plugs or with a hard grease which is
soluble in lubricating oil to prevent particles from
lodging in places from which they would be difficult
to remove and which places are not subject to visual
inspection. After magnetic particle inspection,
remove all such plugs and clean the part thoroughly in
solvent; then dry with compressed air. Check for
complete demagnetization.
TABLE VIII
CRITICAL NEW PART DIMENSIONS
PART NAME FEATURE
NEW DIMENSION
(INCHES)
Cylinder Head Rocker Shaft Boss Bore
Intake Valve Guide Bore
Exhaust Valve Guide Bore
0.7495 - 0.7510
0.4352 - 0.4362
0.4370 - 0.4380
Valve Rocker Shaft Outside Diameter 0.7490 - 0.7495
Valve Rocker Bushings Inside Diameter 0.7505 - 0.7515
Intake Valve Stem Diameter 0.4335 - 0.4340
Exhaust Valve Stem Diameter 0.4335 - 0.4340
Piston (Standard) *Diameter at Top
*Diameter Below 1St Groove
*Diameter at Bottom
Pin Bore Diameter
Third Ring Groove Width
Fourth Ring Groove Width
5.2030 - 5.2050
5.2180 - 5.2200
5.2405 - 5.2420
1.1246 - 1.1250
0.1910 - 0.1920
0.1000 - 0.1010
Piston Pin Assembly Length (Including Plugs)
Diameter
5.2050 - 5.2200
1.1243 - 1.1245
Connecting Rod Bushing Bore Diameter
Bushing Center-to-Crankpin Center
1.1267 - 1.1269
6.6230 - 6.6270
Crankshaft Assembly Damper Pin Bushing I.D. (16) 0.6240 - 0.6260