Use a thickness gauge [A] to measure the space between the straightedge [B] and the head.
Cylinder Head Warp
Standard: —
Service Limit: 0.05 mm
★ If the cylinder head is warped more than the service limit, replace it.
★ If the cylinder head is warped less than the service limit, repair the head by rubbing the lower surface on emery paper secured to a surface plate (first No. 200, then No. 400).