Toyota
Jeep Cherokee
 Service Manual
Engine » 2.5L engine » Service procedures
Valve timing

  • Disconnect the spark plug wires and remove the spark plugs.
  •  Remove the engine cylinder head cover.
  •  Remove the capscrews, bridge and pivot assembly, and rocker arms from above the No.1 cylinder.
  •  Alternately loosen each capscrew, one turn at a time, to avoid damaging the bridge.
  •  Rotate the crankshaft until the No.4 piston is at top dead center (TDC) on the compression stroke.
  •  Rotate the crankshaft counterclockwise (viewed from the front of the engine) 90.
  •  Install a dial indicator on the end of the No.1 cylinder intake valve push rod. Use rubber tubing to secure the indicator stem on the push rod.
  •  Set the dial indicator pointer at zero.
  •  Set the dial indicator pointer at zero.
  •  Rotate the crankshaft clockwise (viewed from the front of the engine) until the dial indicator pointer indicates 0.305 mm (0.012 inch) travel distance (lift).
  •  The timing notch index on the vibration damper should be aligned with the TDC mark on the timing degree scale.
  •  If the timing notch is more than 13 mm (1/2 inch) away from the TDC mark in either direction, the valve timing is incorrect.
  •  If the valve timing is incorrect, the cause may be a broken camshaft pin. It is not necessary to replace the camshaft because of pin failure. A spring pin is available for service replacement.
    More about «Service procedures»:

    Valve timing

    Valve, guide and seal

    Piston-fitting

    Piston ring-fitting

    Connecting rod bearings-fitting

    Fitting crankshaft main bearings

    Form-in-place gaskets

    Engine performance

    Honing cylinder bores

    Repair damaged or worn threads

    Service engine assembly (short block)

    Hydrostatic lock

    Engine oil service

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