AutoZone 1988 Ford Truck Bronco II 2WD 2.9L FI 6cyl | Repair Guides | General Information & Maintenance | Routine Maintenance And Tune-up | Valve Lash | AutoZone.com

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    1988 Ford Truck Bronco II 2WD 2.9L FI 6cyl

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    ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

    Valve Lash

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    ADJUSTMENT



    1.8L and 2.0L Engines

    See Figure 1

    The valves are adjusted with the engine COLD. It is best to allow an engine to sit overnight before beginning a valve adjustment. While all valve adjustments must be made as accurately as possible, it is better to have the valve adjustment slightly loose rather than slightly tight. A burned valve may result from overly tight valve adjustments.

    1. Remove the rocker arm cover and discard the gasket.
    2.  
    3. Make sure both the cylinder head and camshaft retaining bolts are tightened to the proper torque.
    4.  
    5. Rotate the crankshaft pulley until the No. 1 piston is at TDC of the compression stroke.
    6.  

    To make sure the piston is on the correct stroke; remove the spark plug and place a finger over the hole. Feel for air being forced out of the spark plug hole. Both valves on No. 1 cylinder will be closed. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer.

    Click image to see an enlarged view

    Fig. Fig. 1: Valve lash adjusting sequence and cylinder head valve arrangement-1.8L, 2.0L, 2.3L and 2.6L engines

    1. With the No. 1 piston at TDC of the compression stroke, adjust the clearances according to the Valve Adjusting Sequence'' illustrations in this section.
    2.  
    3. Adjust the clearance by loosening the locknut and turning the adjusting screw. Retighten the locknut when the proper thickness feeler gauge passes between the camshaft and valve stem, and has a slight drag when the clearance is corrected.
    4.  
    5. Rotate the crankshaft 1 complete revolution (360°) to position the No. 4 piston at TDC of its compression stroke and adjust the clearances as shown in the illustration.
    6.  
    7. After adjustment, use a new gasket and sealant to install the rocker arm cover.
    8.  

    2.2L Gasoline Engine

    The 2.2L engine found in the 1996 Hombre utilizes hydraulic valve lifters and does not require valve lash adjustments. The rocker arm pivot bolts should be tightened to 22 ft. lbs. (30 Nm) with the valve lifter on the base circle of the camshaft. If this was done and the engine still makes noises, as though the valve lash needs adjustment, there is a defect in one of the valve train components (bent pushrod, malfunctioning hydraulic lifter, worn or damaged rocker arm, etc.).

    2.2L Diesel Engine

    See Figure 2

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the rocker arm cover.
    4.  
    5. Rotate the crankshaft until No. 1 piston is at TDC of the compression stroke (firing position). To determine if the No. 1 cylinder is on the compression stroke, place fingers on the No. 1 cylinder's valves as the mark on the damper comes near the timing mark pointer. If the rocker arms are not moving, the engine is in the No. 1 firing position. If the rocker arms are moving, turn the crankshaft one complete revolution until the timing marks align again.
    6.  
    7. With the engine in the No. 1 firing position, adjust the following valves to 0.016 in. (0.40mm) on a cold engine:
      1. Cylinder No. 1: Intake and Exhaust
      2.  
      3. Cylinder No. 2: Intake
      4.  
      5. Cylinder No. 3: Exhaust
      6.  

    8.  



    Click image to see an enlarged view

    Fig. Fig. 2: Adjust the valve lash in the sequence and manner shown-2.2L diesel engine

    1. As before, rotate the crankshaft until No. 4-cylinder is at TDC of the compression stroke (firing position). To determine if the No. 4 piston is on the compression stroke, place fingers on the No. 4-cylinder's valves as the mark on the damper comes near the timing mark pointer. If the rocker arms are not moving, the engine is in the No. 4 firing position. If the rocker arms are moving, turn the crankshaft one complete turn until the timing marks align again.
    2.  
    3. With the engine in the No. 4 firing position, adjust the following valves to 0.016 in. (0.40mm) on a cold engine:
      1. Cylinder No. 2: Exhaust
      2.  
      3. Cylinder No. 3: Intake
      4.  
      5. Cylinder No. 4: Intake and Exhaust
      6.  

    4.  
    5. Make sure the rocker arm cover gasket surface is clean and free of nicks, scratches or damage. Using a new gasket, install the rocker arm cover. Tighten the hold-down bolts to 12-17 ft. lbs. (16-23 Nm).
    6.  
    7. Connect the negative battery cable.
    8.  

    2.3L and 2.6L Engines

    See Figures 1 and 3

    The valves are adjusted with the engine COLD. It is best to allow an engine to sit overnight before beginning a valve adjustment. While all valve adjustments must be made as accurately as possible, it is better to have the valve adjustment slightly loose rather than slightly tight. A burned valve may result from overly tight valve adjustments.

    1. Remove the rocker arm cover and discard the gasket.
    2.  
    3. Rotate the crankshaft pulley until the No. 1 piston is at TDC of the compression stroke.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 3: Adjust the valve lash as shown-2.3L and 2.6L engines

    To make sure the piston is on the correct stroke, remove the spark plug and place your finger over the hole. Feel for air being forced out of the spark plug hole. Both valves on No. 1 cylinder will be closed. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer.

    1. With the No. 1 piston at TDC of the compression stroke, adjust the clearances of the following valves: Intake 1 and 2; Exhaust 1 and 3.
    2.  
    3. Adjust the clearance by loosening the locknut and turning the adjusting screw. Retighten the locknut when the proper thickness feeler gauge passes between the rocker arm and valve stem, and has a slight drag when the clearance is corrected. Clearance is 0.006 in. (0.15mm) for intake and 0.010 (0.25mm) for exhaust.
    4.  
    5. Rotate the crankshaft 1 complete revolution (360 degrees) to position the No. 4 piston at TDC of its compression stroke and adjust the clearances of the following valves: Intake 3 and 4; Exhaust 2 and 4.
    6.  
    7. After each valve is adjusted, tighten its locknut to 10 ft. lbs. (13 Nm).
    8.  
    9. After adjustment, install the rocker arm cover using a new gasket and sealant.
    10.  
    11. Retighten the crankshaft pulley if it was loosened during the valve adjustment.
    12.  

    2.8L and 3.1L Engines

    See Figure 4

    1. Remove the valve covers.
    2.  
    3. Rotate the crankshaft until the No. 1 piston is at TDC of its compression stroke.
    4.  

    When the notch on the damper pulley is aligned with the 0 timing mark and the rocker arms of the No. 1 cylinder do not move, the engine is at the TDC of the compression stroke of the No. 1 cylinder. If the rocker arms move as the timing mark approaches the 0'' mark, rotate the crankshaft one full revolution until the timing mark aligns with 0'' again.

    1. The cylinders in the engine are arranged from the front of the cylinder head to the back, as follows:

      Right-hand cylinder head-Cylinder No. 1, No. 3 and No. 5
       
      Left-hand cylinder head-Cylinder No. 2, No. 4 and No. 6
       

    2.  
    3. The engine's valves are arranged from the front of the cylinder head to the back, as follows:

      Right-hand cylinder head-Exhaust, intake, exhaust, intake, intake, exhaust
       
      Left-hand cylinder head-Exhaust, intake, intake, exhaust, intake, exhaust
       

    4.  
    5. With the engine at TDC of the No. 1 cylinder, adjust the following valves: Exhaust 1, 2 and 3; Intake: 1, 5 and 6
    6.  
    7. Back out the adjusting nut until lash is felt.
    8.  
    9. Tighten the adjusting nut until the lash is removed, then tighten the nut an additional 1 1 / 2 turns to center the lifter plunger.
    10.  



    Click image to see an enlarged view

    Fig. Fig. 4: Tighten the rocker arm pivot bolt and twist the pushrod with your fingers; once the pushrod becomes slightly more difficult to turn, tighten the bolt an additional one-half of a turn-2.8L and 3.1L engines

    1. Rotate the engine 1 complete revolution and reposition the notch on the damper pulley with the 0 mark on the timing tab; this is the No. 4-cylinder firing position.
    2.  
    3. With the engine at TDC of the No. 4-cylinder, adjust the following valves: Exhaust 4, 5 and 6; Intake 2, 3 and 4
    4.  
    5. Back out the adjusting nut until lash is felt.
    6.  
    7. Tighten the adjusting nut until the lash is removed, plus, turn the nut 1 1 / 2 additional turns to center the lifter plunger.
    8.  
    9. Using new gaskets and sealant, install the rocker arm covers.
    10.  

    3.2L Engines

    Isuzu 3.2L SOHC and DOHC engines are equipped with hydraulic lash adjusters. No valve adjustments are necessary.

     
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