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# ENGINE UNIT > REPAIR

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1. INSPECT BORE CYLINDER

HINT:

1. Bore all the 4 cylinders for the O/S piston outside diameter.
2. Replace all the piston rings with ones to match the O/S pistons.

1. Keep 4 new O/S pistons.

   O/S 0.50 piston diameter:
     92.42 to 92.45 mm (3.6386 to 3.6398 in.)

1. Using a micrometer, measure the piston diameter at right angles to the piston center line, the indicated distance from the piston head.

   Distance:
     64.90 to 65.16 mm (2.5551 to 2.5653 in.)

1. Calculate how much each cylinder needs to be rebored:

   Size to be rebored:
     Size to be rebored = P + C - H
     P = Piston diameter
     C = Piston clearance: 0.070 to 0.090 mm (0.0028 to 0.0035 in.)
     H = Allowance for honing: 0.02 mm (0.0008 in.) or less

1. Bore and hone the cylinders to calculated dimensions.

   Maximum honing:
     0.02 mm (0.0008 in.)

   NOTICE:
     Excess honing will destroy the finished roundness.