Lotus Elise Service Notes page 230

ENGINE
Pistons - inspection
1.
2.
3.
4.
5.
6.
Check pistons for distortion and cracks.
Measure and record piston diameter at right
angle to gudgeon pin and 8 mm from bottom of
skirt.
Check piston diameter with figures given.
Measure and record piston diameter in line
with gudgeon pin hole and 8 mm from bottom
of skirt.
Check piston ovality with figures given.
Repeat above procedures for remaining
pistons.
K8 and K16-1.1 and 1.4:
Grade A = 74.940 to 74.955 mm
Grade B = 74.956 to 74.970 mm
Maximum ovality = 0.3 mm
K16-1.6 and 1.8:
Grade A = 79.975 to 79.990 mm
Grade B = 79.991 to 80.005 mm
Maximum ovality = 0.3 mm
Sen/ice pistons are grade A and B
A
NOTE: Piston grades A or B are stamped
on crown of piston.
8RM3496
4. Check new ring fitted gap 20 mm from top of
cylinder liner bore:
CAUTION: Ensure rings are kept square to
/ ! \ liner bore and that they are suitably
identified to the bore in which they are
checked and fitted to the piston for that bore.
K8 and K16 -1.1 and 1.4:
Top compression ring - = 0.17 to 0.37 mm
2nd compression ring - = 0.37 to 0.57 mm
Oil control rails = 0.15 to 0 40 mm
K16-1.6 and 1.8:
Top compression ring - = 0.20 to 0.35 mm
2nd compression ring - = 0.28 to 0.48 mm
Oil control rails = 0.15 to 0.40 mm
OVERHAUL 9 3