Engine Unit Repair


  1. BORE CYLINDER

Engine Unit -- Repair



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

  1. Prepare 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.)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Mechanical.Engine Unit.Engine Unit Repair

  1. Using a micrometer, measure the piston diameter according to the following conditions: 1) measure at a right angle to the piston center line, and 2) measure at 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 the calculated dimensions.

    Maximum honing:
    0.02 mm (0.0008 in.)
    NOTICE:
    Excess honing will destroy the finished roundness.