Cylinder sleeves (1) Using a cylinder gauge, take ID measurements in two directions (parallel and transverse to crank- shaft axis) on each cylinder sleeve, at three places indicated below. If wear reaches the repair limit, reb ore the sleeve to the next specifted oversize. Specifications Unit: mm (in.) I Taking ID measurements on cylinder sleeves Crlnkcase gaske,ed surfKe Positions for checking sleeve bore diameter (2) There are three oversizes for cylinder sleeves, name- ly, +0.25 mm (0.0098 in.), +0.50 mm (0.0197 in.) and +0.75 mm (0.0295 in.). The tolerance to which the sleeves should be refinished by boring is 0 - 0.035 mm (0.0014 in.).
When the sleeves are re- bored, oversize pistons and piston rings should be used. (3) An oversize to which any sleeve worn taper and/or out of round is to be rebored should be determined by relying on the most worn part of the sleeve. A cylinder sleeve whose abnormal wear is 0.4 mm (0.0157 in.) should be rebored to 1 mm (0.0394 in.) oversize, for example. (NOTE] Removing ridge with ridge reamer a) All cylinders should be rebored to one and the same oversize. b) When the sleeves are not worn beyond the repair limit, but the piston rings have to be renewed, correct stepped wear on the top part of the sleeve by using a ridge reamer and, if necessary, refinish the sleeves by honing.
-20 - Item Standard Repair limit Service limit Cylinder sleeve ID 84 +0.035 0 (3.307 +g.00138) +0.20 (+0.008) 0.70 (0.0276) Out of roundness 0.1 (0.004), max Taper 0.015 (0.0006), max oJ, 0111 (0r .43i 1 .:) ~~' 2 3 '.