EBS00230 CHECKING THE CYLINDER HEAD 1. Eliminate: combustion chamber carbon deposits (with a rounded scraper) NOTE: _ Do not use a sharp instrument to avoid damag- ing or scratching: spark plug bore threads valve seats 2. Check: cylinder head Damage/scratches Replace. cylinder head water jacket Mineral deposits/rust Eliminate. 3. Measure: cylinder head warpage Out of specification Resurface the cylin- der head. MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. Place a straightedge 1 and a thickness gauge 2 across the cylinder head. b. Measure the warpage. c. If the limit is exceeded, resurface the cylin- der head as follows. d.
Place a 400 ~ 600 grit wet sandpaper on the surface plate and resurface the cylinder head using a figure-eight sanding pattern. 1 2 NOTE: _ To ensure an even surface, rotate the cylinder head several times. LLL L L LLL L L LLL L L LLL L L LLL L L LLL L LLL 4 - 14 CYLINDER HEAD ENG Maximum cylinder head warpage 0.03 mm (0.0012 in)