How to change timing belt on 89-95 MTX SHO

Discussion in 'Gen 1 & 2 - Guides (For How-to guides, NOT how-to ' started by 03cobraSHO, Oct 13, 2011.

  1. 03cobraSHO

    03cobraSHO SHO Member

    Joined:
    Oct 5, 2005
    Messages:
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    Location:
    nashville
    REMOVAL

    Disconnect battery cables.
    Remove battery.
    Remove the engine roll damper.

    graphic

    Disconnect wiring to DIS module.
    Remove intake manifold crossover tube bolts.

    Timing Marks
    graphic

    Loosen intake manifold crossover tube hose clamps.
    Remove intake manifold crossover tube.
    Loosen alternator - A/C (6 rib) belt tensioner pulley and relieve tension on belt by backing out adjustment screw.
    Remove alternator - A/C belt.
    Loosen water pump - power steering (4 rib) belt tensioner pulley and relieve tension on belt by backing out adjustment screw.
    Remove water pump - power steering belt.
    Remove alternator - A/C belt tensioner pulley and bracket assembly.
    Remove water pump - power steering belt tensioner pulley only.
    Remove upper timing belt cover.
    Disconnect crankshaft sensor connectors.
    Place gear selector in neutral.
    Set engine to TDC on No. 1 cylinder. Ensure that "white" mark on crankshaft damper aligns with 0 degree index mark on lower timing belt cover and that marks on intake camshaft pulleys align with index marks on metal timing belt cover.

    Timing Belt Tensioner Unloaded
    graphic

    Raise vehicle on a hoist.
    Remove RH front wheel and tire assembly.
    Loosen fender splash shield and place out of the way.
    Remove crankshaft damper using Puller T67L- 3600-A, Adapter D80L-630-3 and Screws T89P-6701-A or equivalent.
    Remove lower timing belt cover.
    Remove center timing belt cover and disconnect crankshaft sensor wire and grommet from the slot in the cover and stud on water pump.
    Loosen timing belt tensioner, rotate pulley 180 degrees clockwise and tighten tensioner nut to hold pulley in the "unload position."
    Lower vehicle.
    Remove timing belt.

    INSTALLATION

    CAUTION: Before installing timing belt, inspect it for cracks, wear or other damage. Replace if damaged. Do not allow timing belt to come in contact with gasoline, oil, water, coolant or steam. Do not turn belt inside out or twist belt.

    Always store in a cool dark place.
    Always keep belt in protective packaging until ready for use.
    Never hit or squeeze belt with hammer or screwdriver.

    graphic

    Ensure engine is at TDC on No. 1 cylinder. Check the camshaft pulley marks line up with index marks on upper steel belt cover and that crankshaft pulley aligns with index mark on oil pump housing.
    Install timing belt on crankshaft pulley and route to camshaft pulley. Lettering on belt "KOA" should be readable from rear of engine (top of lettering to front of engine). Also ensure that the yellow lines are aligned with the index marks on the pulleys.
    Release tensioner locknut and leave nut loose.
    Raise vehicle.
    Install center timing belt cover. Ensure crankshaft sensor wiring and grommet are installed and routed properly. Tighten bolts to 7-11 N-m (60-90 in lbs).
    Install lower timing belt cover. Tighten bolts to 7-11 N-m (60-90 in lbs).
    Install crank damper using Crankshaft Seal Installer/Cover Aligner T88T-6701-A with forcing screw from Vibration Damper and Seal Installer T82L-6316-A or equivalent.

    Yellow Index Mark
    graphic

    Rotate crankshaft two revolutions in the clockwise direction until the yellow mark on damper aligns with 0 degree mark on lower timing belt cover.

    White Index Mark
    graphic

    Remove plastic door in the lower timing belt cover. Tighten tensioner lock nut to 33-51 N-m (25-37 ft lbs) and install plastic door.
    Rotate crankshaft 60 degrees more in the clockwise direction until the white mark on the damper aligns with 0 degree index mark on lower timing belt cover.
    Lower vehicle.
    Ensure index marks on camshaft pulleys align with marks on rear metal timing belt cover.
    Route crankshaft sensor wiring and connect with engine wiring harness.
    Install upper timing belt cover. Tighten bolts to 7-11 N-m (60-90 in lbs).
    Install water pump - power steering tensioner pulley. Tighten nut to 15-23 N-m (11-17 ft lbs).
    Install alternator - A/C tensioner pulley and bracket assembly. Tighten bolts to 15-23 N-m (11-17 ft lbs).
    Install water pump - power steering (4 rib) belt. Using Belt Tension Gauge(NNN) NNN-NNNN or equivalent, set tension. Tighten idler pulley nut to 34-50 N-m (25-36 ft lbs).

    New belt: 690-880 N (154-198 lbs)
    Used belt: 500-700 N (112-157 lbs)

    Install alternator - A/C (6 rib) belt. Using Belt Tension Gauge(NNN) NNN-NNNN or equivalent, set tension. Tighten idler pulley nut to 34-50 Nm (25-36 ft lbs).

    New belt:(NNN) NNN-NNNNN (220-265 lbs)
    Used belt: 660-85 N (148-192 lbs)

    Install intake manifold cross over tube. Tighten bolts to 15-23 N-m (11-17 ft lbs).
    Install engine roll damper.
    Install battery.
    Connect battery cables.
    Raise vehicle.
    Install splash shield.
    Install RH front tire and wheel assembly.
    Lower vehicle.
     
    auto.guru likes this.
  2. 03cobraSHO

    03cobraSHO SHO Member

    Joined:
    Oct 5, 2005
    Messages:
    80
    Likes Received:
    3
    Location:
    nashville

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