AutoZone 2007 BMW 328XI 3.0L EFI DOHC 6cyl | Repair Guides | Engine Performance And Tune-up | Valve Lash | Adjustment | AutoZone.com

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    Ford Mid-Size Cars 1971-1985 Repair Guide

    Adjustment

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    4-CYLINDER ENGINES



    See Figure 1

    The 2.3L engine is an overhead cam engine with hydraulic lash adjusters. These units are placed at the fulcrum point of the cam followers (rocker arms). Their action are similar to hydraulic tappets used in pushrod engines and are serviced in the same manner.

    The valve arrangement in a 2.3L engine, looking from the front to rear of the vehicle is exhaust valve, then intake valve. This order applies to all four cylinders.

    1. Position the camshaft so that the base circle of the lobe is facing the cam follower of the valve to be checked.
    2.  
    3. Using the appropriate tool (T74P-6565 or equivalent), slowly apply pressure to the cam follower until the lash adjuster is completely collapsed. Hold the follower in this position and insert the proper size feeler gauge between the base circle of the cam and the follower.
    4.  
    5. If the clearance is excessive, remove the cam follower and inspect for damage.
    6.  
    7. If the cam follower appears to be intact and not excessively worn, measure the valve spring assembled height to be sure the valve is not sticking.
    8.  
    9. If the valve spring assembled height is correct, check the dimensions of the camshaft.
    10.  
    11. If the camshaft dimensions are within specifications, remove, clean and test the lash adjuster.
    12.  
    13. Reinstall the lash adjuster and check the clearance. Replace any damaged or worn parts, as necessary.
    14.  



    Click image to see an enlarged view

    Fig. Fig. 1: Checking the hydraulic valve lash-2.3L engine

    6-CYLINDER ENGINES



    This procedure applies only when cylinder head components have been removed. Because of their hydraulic lifter assemblies, routine adjustments are not necessary.

    1. Crank the engine until the TDC mark on the crankshaft pulley is aligned with the timing pointer on the cylinder front cover.
    2.  
    3. Scribe a mark on the pulley in relation to the pointer. This we will call A.
    4.  
    5. Scribe two more marks on the damper, each equally spaced from the first mark. These marks we will call B and C.
    6.  
    7. With the engine on TDC of the compression stroke, (mark A aligned with the pointer) back off the rocker arm adjusting nut until there is end-play in the pushrod. Tighten the adjusting nut until all clearance is removed. Tighten the adjusting nut an additional 3 / 4 turn. To check that all the excess clearance is removed, turn the pushrod with your fingers. When the pushrod can no longer be turned, all the clearance has been removed.
    8.  
    9. Repeat this procedure for each valve, turning the crankshaft 1 / 3 turn to the next mark each time and following the engine firing order of 1-5-3-6-4-2.
    10.  

    8-CYLINDER ENGINES



    This procedure applies only when cylinder head components have been removed. Because of their hydraulic lifter assemblies, routine adjustments are not necessary.

    Identifying Type of Rocker Arm

    The 8-cylinder engines covered in this guide use 2 different type rocker arms. Before proceeding with any cylinder head work or valve adjustment, it is important to identify the type of rocker arms installed.

    The early 5.0L engine were equipped with adjustable rocker arms. However, due to production differences, some of these early 5.0L engines may be equipped with positive stop rocker arm mounting studs.

    To identify the type of rocker arm installed, proceed as follows:

    1. Remove the rocker arm cover from the cylinder head. Refer to Engine & Engine Overhaul for details.
    2.  
    3. Examine the studs used to secure the rocker arms.
    4.  
    5. If the shank portion of the stud exposed above the cylinder head is the same diameter as the threaded portion to which the rocker arm retaining nut attaches, this is an adjustable type rocker arm.
    6.  
    7. If the shank of the stud is of greater diameter than the threaded portion, this identifies the stud as a positive stop rocker arm stud.
    8.  
    9. Refer to the appropriate procedure below.
    10.  

    Adjustable Rocker Arms

    1. Crank the engine until the No. 1 cylinder is at TDC of the compression stroke and the timing pointer is aligned with the mark on the crankshaft pulley.
    2.  
    3. Scribe a mark on the pulley at this point. This we will call A.
    4.  
    5. Scribe three more marks on the damper, dividing the damper into 4 quarters. These additional marks we will call B, C and D.
    6.  
    7. With mark A aligned with the timing pointer, adjust the valves on the No. 1 cylinder, by backing off the adjusting nut until the pushrod shows free-play in it. Then, tighten the nut until there is no free-play in the rocker arm. This can be determined by turning the pushrod with your fingers while tightening the nut; when the pushrod can no longer be turned, all clearance has been removed. After the clearance has been removed, tighten the nut an additional 3 / 4 of a turn.
    8.  
    9. Repeat this procedure for each valve, turning the crankshaft 1 / 4 turn to the next mark each time and following the engine firing order of 1-5-4-2-6-3-7-8.
    10.  

    Positive Stop Type Rocker Arms

    1. Crank the engine until the No. 1 cylinder is at TDC of the compression stroke and the timing pointer is aligned with the mark on the crankshaft pulley.
    2.  
    3. Scribe a mark on the pulley at this point. This point we will call A.
    4.  
    5. Scribe two additional marks on the pulley. These points we will call B and C.
    6.  
    7. With the timing pointer aligned with mark A on the pulley, tighten the following valves to the specified torque:4.2L, 5.0L, 7.0L, and 7.5L Engines
    8.  



    Intake Valve on Cylinder No. 1, 7 and 8,
     
    Exhaust Valve on Cylinder No. 1, 5, and 4
     

    5.8L and 6.6L Engines


    Intake Valve on Cylinder No. 1, 4, and 8
     
    Exhaust Valve on Cylinder No. 1, 3, and 7
     

    1. Rotate the crankshaft 180º to point B and tighten the following valves:
    2.  

    4.2L, 5.0L, 7.0L, and 7.5L Engines



    Intake Valve on Cylinder No. 5 and 4
     
    Exhaust Valve on Cylinder No. 2 and 6
     

    5.8L and 6.6L Engines


    Intake Valve on Cylinder No. 3 and 7
     
    Exhaust Valve on Cylinder No. 2 and 6
     

    1. Rotate the crankshaft 270º to point C and tighten the following valves: 4.2L, 5.0L, 7.0L, and 7.5L Engines
    2.  



    Cylinder Intake Valve No. 2, 3, and 6
     
    Cylinder Exhaust Valve No. 7, 3 and 8
     

    5.8L and 6.6L Engines


    Cylinder Intake Valve No. 2, 5, and 6
     
    Cylinder Exhaust Valve No. 4, 5, and 8
     

    1. Tighten the rocker arms on 4.2L , 5.0L and 5.8L engines until the nut contacts the rocker shoulder, then tighten to 18-20 ft. lbs. (24-27 Nm).
    2.  
    3. Tighten the rocker arms on 6.6L engines until the nut contacts the rocker shoulder then tighten to 18-25 ft. lbs. (24;34 Nm).
    4.  
    5. Tighten the rocker arms on 7.0L and 7.5L engines until the nut contacts the rocker shoulder then tighten to 18-22 ft. lbs. (24-30 Nm).
    6.  

     
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