For 1990-2009 cars only
- Remove all carbon from the combustion chamber.
- Be sure not to make scratch on the intake and exhaust ports of the cylinder head, the combustion camber, and the head surface together with and the valve seats.
- Measure the cylinder on the 6 different places using a straight ruler and the thickness gage. If the measurement is red over the limit of use, confirm the deformed area by placing it on the flat plate and repair it with fine abrasives. Replace the cylinder head of which repair is impossible.
- Measure the flatness of the cylinder head surface in the location of each 4 side and diagonal.
- Using a straight ruler and a thickness gage, inspect the surface of the cylinder head. Repair or replace the cylinder head before installation, if necessary.
Warning: Refer to Safety Glasses Warning in the Preface section.
Caution: The damage of the cylinder head surface may cause the loss of power due to the leakage of the compression.
Specifications
The damage limit of the cylinder head flatness is 0.05 mm (0.0020 in).
Specifications
The damage limit of the manifold is 0.10 mm (0.0039 in).
