Inspection of Gudgeon Pins for V8 Engine Overhaul (35, 39, 42)
ENGINE
38
OVERHAUL
Pistons and connecting rods - inspection
1. Clean carbon from pistons
2. Inspect pistons for distortion, cracks and
burning.
3. Measure and record piston diameter at 90
°
to
gudgeon pin axis and 10 mm (0.4 in) from
bottom of skirt.
4. Check gudgeon pin bore in piston for signs of
overheating.
NOTE: Pistons fitted on production are
graded A or B, the grade letter is stamped
on the piston crown. Grade B pistons are
supplied as service replacements. Worn cylinder
liners fitted with grade A pistons may be honed
to accept grade B pistons provided that
specified cylinder bore and ovality limits are
maintained.
CAUTION: DO NOT attempt to de-glaze
cylinder bores.
CAUTION: Ensure replacement pistons are
correct for the compression ratio of the
engine. The compression ratio will be
found on the cylinder block above the engine
serial number. Ensure that replacement
connecting rods are correct for engine being
overhauled.
5. Check connecting rods for alignment.
Gudgeon pins - inspection
NOTE: Gudgeon pins are only supplied as
an assembly with replacement pistons.
1. Check gudgeon pins for signs of wear and
overheating.
2. Check clearance of gudgeon pin in piston:
Gudgeon pin to piston clearance = 0.006 to
0.015 mm (0.0002 to 0.0006 in)
3. Check overall dimensions of gudgeon pin:
Overall length = 72.67 to 72.79 mm (2.85 to
2.86 in)
Diameter - measured at each end and centre
of pin = 22.215 to 22.220 mm (0.87 to 0.871 in)
