Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1418

ENGINE OVERHAUL -
11.65 mm
Piston outer diameter
Crankshaft and Cylinder Block
3. CYLINDER BORING
(1) Select the oversized piston to be used using the
maximum inner diameter cylinder as a reference.
(2) There are two types of oversized pistons (0.50 mm,
1.00 mm), so bore so that the clearance is at the
specified value that matches the piston's outer
diameter. The reference points for measuring the
piston's outer diameter are shown in the illustration.
(3) Calculate the boring finish dimensions based on the
piston outer diameter measurement value.
Boring finish dimension = Piston outer diameter +
0.02 to 0.04 mm (clearance with cylinder) - 0.02 mm
(honing margin)
(4) Bore each cylinder to the boring finish dimensions
calculated above.
Caution
To prevent strain caused by a temperature rise
during boring, bore in the order of the No. 2 →
No. 4 → No. 1 → No. 3 cylinders.
(5) Hone to the final finish dimension (piston outer
diameter + clearance with cylinder).
(6) Confirm the clearance between the piston and
cylinder.
Standard value: 0.02 - 0.04 mm
11B-69