Measuring Cylinder Bore - Pontiac Grand Prix Service Manual

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PONTIAC SERVICE MANUAL

SUPPORT REMOVAL

Fig. 6-116 Removing Piston Pin

5. Complete removal of pin using pin driver J 6901-3

and base alone.

6. Remove bearing cap and bearings.

CLEAN AND INSPECT

1. Clean carbon, varnish, and gum from piston

surfaces, including underside of piston head. Clean

ring grooves, and oil slots 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 assure

against subsequent mixing of caps and connecting

3. Carefully examine piston for rough or scored

bearing surfaces; cracks in skirt or head; cracked,

Fig. 6-118 Measuring Cylinder Bore

broken, or worn ring lands; scored, galled, or worn

piston bosses. Damaged or faulty pistons should be

If piston pin bosses are rough or worn out

ofround and the piston is otherwise serviceable, the pin

bosses may be honed for oversize pins. Before fitting

oversize pins, however, it is advisable to check fit of

piston in bore.

4. Inspect piston pin for scoring, roughness, or uneven

5. Inspect bearing shells to see that they are service-

able. Fit of bearings should be checked when engine is

being assembled.

Inspect cylinder bores for out-of-round or excessive

taper with an accurate cylinder gauge J 8087 or

Fig. 6-117 Normal Cylinder Wear Pattern

Fig. 6.119 Measuring Cylinder Gauge

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