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1 5 1 ENGINE
6A2-19
Fig. 6A2-42 Checking Ring Gap
Fig. 6A2-44 Removing Piston Pin
Fig. 6A2-43 Checking Side Clearance F y p i c a l )
CAUTION: Use care at all times when handling
and servicing connecting rods and pistons. To
prevent possible damage to these units, do not
clamp rod orpiston in vise since they may become
distorted. Do not allow pistons to strike against
one another, against hard objects or bench
surfaces, since distortion ofpiston contour or nicks
in the sofr aluminum material may result.
1 . Remove piston rings using suitable piston ring
remover.
2. Install pilot of piston pin removing and installing tool
3. Install piston and connecting rod assembly on support
and place assembly in an arbor press (Fig. 6A2-44). Press pin
out of connecting rod. Use piston pin tool J-24086 or BT-
76 12.
4. Remove assembly from press, remove piston pin from
support and remove tool from piston and rod.
Clean and Inspect
1. Clean carbon, varnish, and gum from piston surfaces,
including underside of piston head. Clean ring grooves, and
oil holes in oil ring groove, using suitable cleaning tools and
solvent.
2. Clean piston pin, rod, cap, bolts and nuts in suitable
solvent. Reinstall cap on connecting rod to prevent
subsequent mixing of caps and connecting rods.
3.
Carefully examine piston for rough or scored bearing
surfaces; cracks in skirt or head; cracked, broken, or worn
ring lands; and scored, galled, or worn piston bosses.
Damaged or faulty pistons should be replaced.
4. Inspect piston pin for scoring, roughness, or uneven
wear and proper fit.
5. Inspect bearing shells to see that they are not
damaged. Fit of bearings should be checked when engine is
being assembled.
Assemble
There is a notch cast in the top of all piston heads to
facilitate proper installation. The piston assemblies should
always be installed with the notch toward the front of the
engine.
1. Lubricate piston pin holes in piston and connecting
rod lightly with graphite lubricant.
2. Position connecting rod in its respective piston so that
raised notch side of rod at bearing end is opposite the notch
in the piston when installed (Fig. 6A2-46).
3.
Install piston pin on installer and pilot spring and pilot
in support (Fig. 6A2-45). Use piston pin removing and
installing tool 5-24086 or BT-7612.
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