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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.

   Piston diameter:

     O/S 0.50 | O/S 0.75 | O/S 1.00
     96.42 to 96.70 mm (3.7960 to 3.8070 in.) | 96.67 to 96.95 mm (3.8058 to 3.8169 in.) | 96.92 to 97.20 mm (3.8157 to 3.8267 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:
     65.00 to 65.06 mm (2.5591 to 2.5614 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.