Piston And Piston Rings - Kia Cerato 2009 Service Manual

2. Measure the outside diameter of the piston to be used.
3. According to the measured O.D(Outer Diameter), calculate the new bore size.
New bore size = piston O.D + 0.060 to 0.080mm (0.0024 to 0.0031in) (clearance between piston and
cylinder) - 0.01mm (0.0004in) (honing margin.)
4. Bore each of the cylinders to the calculated size.
To prevent distortion that may result from temperature rise during honing, bore the cylinder holes in the
firing order.
5. Hone the cylinders, finishing them to the proper dimension (piston outside diameter + gap with cylinder).
6. Check the clearance between the piston and cylinder.
Standard : 0.060 ~ 0.080mm (0.0024 ~ 0.0031in)
When boring the cylinders, finish all of the cylinders to the same oversize. Do not bore only one cylinder
to the oversize.

PISTON AND PISTON RINGS

1. Clean the piston.
(1) Using a gasket scraper, remove the carbon from the piston top.
(2) Using a groove cleaning tool or broken ring, clean the piston ring grooves.
(3) Using solvent and a brush, thoroughly clean the piston.
Do not use a wire brush.
2. The standard measurement of the piston outside diameter is taken 10mm (0.39in) from bottom land of the
piston.
Standard diameter :
77.13 ~ 77.16mm (3.0366 ~ 3.0378in)