Table of Contents
Advertisement
6 A 5 - 2 0
1977
PONTIAC SERVICE M A N U A L
NOTCHES ON R
FACE REARWARD
ON301 ENGINE.
NOTCHES FACE
FORWARD ON
'
RIGHT BANK AND
REARWARD ON
LEFT BANK
350-400 ENGINE.
3084
1
I
Fig.
6A5-42
Rod Identification
Fig.
6 A 5 - 4 3
Removing Piston Pin
-
Typical
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 pistons should be replaced.
4. Inspect piston pin for scoring, roughness, or uneven
wear and proper fit.
5
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 notches at bearing end will be rearward in 301 engine.
Forward on the right bank and rearward on the left bank in
350 or 400 engine. Fig. 6A5-40
3. Install piston pin on installer and pilot spring and pilot
in support (Fig. 6A5-44). Use piston pin removing and
installing tool.
Fig.
6A5-44
Piston Pin Replacement (Typical)
4. Install piston and rod on support, indexing pilc
through piston and rod.
5. Place support on arbor press, start pin into position
and press on installer until pin pilot bottoms.
6. Remove installer and support assembly from piston
and connecting rod assembly.
7. Check piston pin for freedom of movement in piston
bore.
Advertisement
Table of Contents
