PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING REMOVAL
AND REPAIR (Cont).
Measure diameter of crankshaft journal at each end and middle, and compare readings.
Maximum difference between ends and middle (taper) should be 0.0007 in. (0.0177 mm).
Replace crankshaft if there is excessive taper. (See paragraph 3-15)
Dry cleaning solvent P-D-68. is toxic and flammable. Always wear
protective goggles and gloves and use only in a well-ventilated area. Avoid
contact with skin, eyes, and clothes and DO NOT breathe vapors. DO NOT
use near open flame or excessive heat, The solvents flash point is
100°F-138°F (38°C-59°C). If you become dizzy while using cleaning
solvent, immediately get fresh air and medical help. If solvent contacts
eyes, immediately wash your eyes with water and get medical aid,
DO NOT use wire brush to clean any part of piston. Failure to follow this
caution may result in damage to piston.
Clean varnish from piston skirts (15) and piston pin (7) with dry cleaning solvent. Clean piston
ring grooves with dry cleaning solvent, ensuring that oil ring passage and slot are clean.
Inspect piston (8) for cracked, rounded, or wavy piston ring lands (1 7). Inspect piston skirts
(15) for cracks, scuffs, or damage. Check for cracks at piston pin hole (16) and erosion at top
of piston. Replace piston and piston pin if any of these conditions exist.
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