AutoZone 2001 GMC Truck Sierra 2500 4WD 6.0L SFI 8cyl | Repair Guides | Engine & Engine Overhaul | Engine Mechanical | Timing Chain/timing Belt/timing Gear Cover | AutoZone.com

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    Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

    Timing Chain/Timing Belt/Timing Gear Cover

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    REMOVAL & INSTALLATION



    8R-C, 18R-C, 20R, 22R, 22R-E and 22R-TE Engines

    See Figure 1

    1. Remove the cylinder head as detailed previously.
    2.  
    3. Remove the radiator.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 1: Front cover removal-18R-C, 20R, 22R, 22R-E and 22R-TE engines

    1. Remove the alternator. Remove the oil pan.
    2.  
    3. On engines equipped with air pumps, unfasten the adjusting link bolts and the drive belt. Remove the hoses from the pump; remove the pump and bracket from the engine.
    4.  

    If the truck is equipped with power steering, see Suspension & Steering for its pump removal procedure.

    1. Remove the fan and water pump as a complete assembly.
    2.  


    CAUTION
    To prevent the fluid from running out of the fan coupling, do not tip the assembly over on its side.

    1. Unfasten the crankshaft pulley securing bolt and remove the pulley with a gear puller.
    2.  


    CAUTION
    Do not remove the 10mm bolt from its hole, if installed, as it is used for balancing.

    1. Remove the water by-pass pipe.
    2.  
    3. Remove the fan belt adjusting bar.
    4.  
    5. Disconnect and remove the heater water outlet pipe. On the 22R-TE, remove the No. 3 turbocharger water pipe.
    6.  
    7. Remove the bolts securing the timing chain cover. Withdraw the cover.
    8.  

    To install:
    1. Install the cover and tighten the 8mm bolts to 9 ft. lbs. (13 Nm). Tighten the 10mm bolts to 29 ft. lbs. (39 Nm). Apply sealer to the gaskets for both the timing chain cover and the oil pan.
    2.  
    3. Install the fan belt adjusting bar and tighten it to 9 ft. lbs. (13 Nm).
    4.  
    5. Install the heater water outlet pipe and the No. 3 turbo water hose. Install the water by-pass pipe.
    6.  
    7. Install the crankshaft pulley and tighten the bolt to the proper torque.
    8.  
    9. Install the water pump and fluid coupling. Install the air conditioning compressor and then adjust the tension on all drive belts.
    10.  
    11. Install the oil pan. Install the radiator and then install the cylinder head.
    12.  
    13. Refill the engine with oil and coolant. Road test the truck and check for any leaks.
    14.  

    1L, 2L and 2L-T Engines
    1. Disconnect the cables from both batteries.
    2.  
    3. Remove the air cleaner assembly.
    4.  
    5. Drain the cooling system and remove the radiator, shroud, and radiator hoses.
    6.  

    1. If the vehicle is equipped with air conditioning, remove the compressor drive belt and unbolt the compressor from its mounting brackets. Tie the compressor out of the way. Do not remove the refrigerant lines.
    2.  
    3. Remove the engine cooling fan, pulley, and drive belt.
    4.  
    5. Disconnect the heater hoses at the engine and move the hoses aside.
    6.  
    7. Disconnect the cables which are positioned above the valve cover and move the cables aside.
    8.  
    9. Remove the valve cover and upper front engine cover.
    10.  
    11. Using a wrench on the center crankshaft pulley bolt, rotate the engine (clockwise only) until the TDC mark on the pulley is aligned with the pointer. Check that the valves on the number one cylinder are closed (rocker arms loose). If the valves are not closed, rotate the engine 360° and again align the TDC mark with the pointer.
    12.  
    13. Remove the crankshaft pulley using a puller.
    14.  
    15. Remove the timing belt cover from the front of the engine and the timing belt guide from the front of the crankshaft timing gear.
    16.  
    17. Follow or refer to only the necessary steps of the Cylinder Head Installation procedure. Torque the timing belt cover fasteners to 3-5 ft. lbs., and the crankshaft pulley center bolt to 69-75 ft. lbs.
    18.  

    F and 2F Engines
    1. Drain the cooling system and the crankcase.
    2.  


    CAUTION
    When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

    1. Disconnect the battery.
    2.  
    3. Remove the air cleaner assembly, complete with hoses, from its bracket.
    4.  
    5. Remove the hood latch as well as its brace and support.
    6.  
    7. Remove the headlight bezels and grille assembly.
    8.  
    9. Unfasten the upper and lower radiator hose clamps and remove both of the hoses from the engine.
    10.  
    11. Unfasten the radiator securing bolts and remove the radiator.
    12.  

    Take off the shroud first, if so equipped.

    1. Loosen the drive belt adjusting link and remove the drive belt. Unfasten the alternator multi-connector, withdraw the retaining bolts, and remove the alternator.
    2.  
    3. Perform Step 8 to the air injection pump, if so equipped. Disconnect the hoses from the pump before removing it.
    4.  
    5. Remove the fan and water pump as an assembly.
    6.  
    7. Remove the crankshaft pulley with a gear puller.
    8.  
    9. Remove the gravel shield from underneath the engine.
    10.  
    11. Remove the front driveshaft.
    12.  
    13. Remove the front oil pan bolts, to gain access to the bottom of the timing chain cover.
    14.  

    It may be necessary to insert a thin knife between the pan and the gasket in order to break the pan loose. Use care not to damage the gasket.

    1. Remove the timing chain cover.
    2.  

    To install:
    1. Install the timing gear cover and then install the front driveshaft and gravel shield.
    2.  
    3. Press the crankshaft pulley onto the shaft and then install the fan and water pump as an assembly.
    4.  
    5. Install the air injection pump and the alternator. Adjust the drive belts.
    6.  
    7. Install the radiator and shroud. Reconnect the heater hoses.
    8.  
    9. Install the headlight bezels and the grille. Replace the hood latch and its support.
    10.  
    11. Install the air cleaner and connect the battery. Refill the engine with coolant and check for leaks.
    12.  

    3F-E Engines

    See Figure 2

    1. Disconnect the negative battery cable and drain the coolant.
    2.  


    CAUTION
    When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

    1. Disconnect the accelerator and throttle cables.
    2.  
    3. Remove the air intake hose, air flow meter and air cleaner as an assembly.
    4.  
    5. Loosen the power steering pump drive pulley nut.
    6.  
    7. Remove the fluid coupling with the fan and water pump pulley.
    8.  
    9. Remove the power steering pump and the air conditioning compressor. Remove their brackets. Remove the power steering pump idler pulley and its bracket.
    10.  
    11. Remove the cylinder head cover. Remove the rocker shaft assembly.
    12.  
    13. Remove (mark for correct installation) the distributor.
    14.  
    15. Remove the pushrod cover and then remove the valve lifters. Be certain that they are kept in order.
    16.  
    17. Loosen the six bolts and then slide the power steering pump pulley off the crankshaft.
    18.  
    19. Using Special Tool 09213-58011 and a 46mm socket wrench, remove the crankshaft pulley bolt. Remove the pulley.
    20.  
    21. Remove the oil cooler pipe and its hose.
    22.  
    23. Remove the timing gear cover and gasket.
    24.  

    To install:
    1. Install the timing gear cover and gasket.
    2.  
    3. There are three sizes of timing gear cover bolts. Apply adhesive to the two larger bolts. Install a new gasket and then position the cover. Finger tighten all bolts. Align the crankshaft pulley set key with the groove of the pulley; gently tap the pulley onto the crankshaft. Tighten the larger cover bolts to 18 ft. lbs. (25 Nm). Tighten smaller bolts to 43 inch lbs. (5 Nm). Tighten the pulley bolt to 253 ft. lbs. (343 Nm).
    4.  
    5. Position the power steering pulley on the crankshaft and tighten the six bolts to 13 ft. lbs. (18 Nm).
    6.  
    7. Insert the valve lifters into their bores and install the pushrod cover. Tighten the bolts to 35 inch lbs. (4 Nm). Make sure the valve lifters are installed in the same bore from which they came.
    8.  
    9. Install the rocker shaft assembly, the cylinder head cover and the distributor.
    10.  
    11. Install the water pump pulley, fluid coupling and fan.
    12.  
    13. Install the power steering pump idler pulley and bracket. Install the power steering pump and air conditioning compressor. Adjust the drive belts.
    14.  
    15. Install the air cleaner assembly and then connect and adjust the accelerator and throttle cables.
    16.  
    17. Fill the engine with coolant and connect the battery cable. Start the engine and check for leaks. Check the ignition timing.
    18.  



    Click image to see an enlarged view

    Fig. Fig. 2: Remove the valve lifters in order-3F-E engine

    3VZ-E Engine

    See Figures 3, 4 and 5

    1. Disconnect the negative battery cable and drain the coolant.
    2.  
    3. Remove the radiator and shroud.
    4.  
    5. Remove the power steering belt and pump.
    6.  
    7. Remove the spark plugs.
    8.  
    9. Disconnect the Nos. 2 and 3 air hoses at the air pipe.
    10.  
    11. Disconnect the No. 1 water by-pass hose at the air pipe and then remove the water outlet.
    12.  
    13. Remove the air conditioning belt. Remove the alternator drive belt, fluid coupling, guide and fan pulley.
    14.  
    15. Disconnect the high tension cords and their clamps at the No. 2 (upper) timing belt cover and then remove the cover and its three gaskets.
    16.  
    17. Rotate the crankshaft pulley until the groove on its lip is aligned with the 0 on the No. 1 (lower) timing belt cover, this should set the No. 1 cylinder at TDC of its compression stroke. The matchmarks on the camshaft timing pulleys must be in alignment with those on the No. 3 (upper rear) timing cover. If not, rotate the engine 360° (one complete revolution.
    18.  
    19. Remove the crankshaft pulley using a puller.
    20.  
    21. Remove the fan pulley bracket and then remove the No. 1 timing belt cover.
    22.  

    To install:
    1. Install the No. 1 cover with the two gaskets and tighten the bolts to 48 inch lbs. (5.4 Nm).
    2.  
    3. Install the fan pulley bracket and tighten it to 30 ft. lbs. (41 Nm).
    4.  
    5. Install the No. 2 cover and tighten the bolts 48 inch lbs. (5.4 Nm).
    6.  
    7. Position the crankshaft pulley so the groove in the pulley is aligned with the woodruff key in the crankshaft. Tighten the bolt to 181 ft. lbs. (245 Nm).
    8.  
    9. Install the fan pulley, guide, fluid coupling and alternator drive belt. Adjust the belt tension.
    10.  
    11. Install the power steering pump and belt. Install the air conditioning belt. Adjust the belt tension.
    12.  
    13. Install the water outlet and connect the by-pass hose. Connect the Nos. 2 and 3 air hoses.
    14.  
    15. Install the spark plugs. Install the radiator, fill with coolant and road test the vehicle. Check for leaks and check the ignition timing.
    16.  



    Click image to see an enlarged view

    Fig. Fig. 3: Remove the No. 2 timing belt cover-3VZ-E engine



    Click image to see an enlarged view

    Fig. Fig. 4: Matchmark alignment on the camshaft timing pulleys-3VZ-E engine



    Click image to see an enlarged view

    Fig. Fig. 5: Remove the No. 1 timing belt cover-3VZ-E engine

    TIMING COVER OIL SEAL REPLACEMENT



    See Figures 6, 7, 8 and 9

    8R-C, 18R-C, F, 2F and 3F-E Engines
    1. Remove the timing chain cover, as previously detailed in the appropriate section.
    2.  
    3. Inspect the oil seal for signs of wear, leakage, or damage.
    4.  
    5. If worn, pry the old oil seal out, using a suitable pry bar. Remove it toward the front of the cover.
    6.  

    Once the oil seal has been removed, it must be replaced with a new one.

    1. Use a socket, pipe, or block of wood and a hammer to drift the oil seal into place. Work from the front of the cover.
    2.  


    CAUTION
    Be extremely careful not to damage the seal or else it will leak.

    1. Install the timing chain cover as previously outlined.
    2.  

    20R, 22R, 22R-E and 22R-TE Engines

    When repairing the oil pump, the oil pan and strainer should be removed and cleaned.

    1. Remove the fan shroud and fan assembly.
    2.  
    3. Remove all drive belts.
    4.  
    5. Remove the crankshaft pulley.
    6.  
    7. Unbolt the oil pump from the front cover and remove.
    8.  
    9. Using a suitable pry bar, remove the old oil seal from the pump.
    10.  
    11. Lightly oil the new seal, and using an old socket or block of wood and hammer, carefully drive the new seal into place, working from the front of the pump.
    12.  

    1L, 2L, 2L-T and 3VZ-E Engines

    The following procedure covers front oil seal and oil pump seal removal with the front timing belt case removed from the block. It is possible to remove the seal with the case installed, but a special service tool is required.

    1. Remove the timing belt covers, timing belt assembly and lower timing pulleys from the engine.
    2.  
    3. Remove the timing belt case (the rear section of the timing belt cover) from the cylinder block.
    4.  
    5. Using a small pry bar, remove the front oil seal and the pump drive oil seal. Do not gouge the case.
    6.  
    7. Apply a multi-purpose grease to the lips of the new oil seals. Carefully install the new seals using an old socket or oil seal tool.
    8.  



    Click image to see an enlarged view

    Fig. Fig. 6: Exploded view of the timing chain and front cover assembly-20R, 22R, 22R-E and 22R-TE engines



    Click image to see an enlarged view

    Fig. Fig. 7: Exploded view of the timing belt and front cover assembly-1L, 2L, and 2L-T engines



    Click image to see an enlarged view

    Fig. Fig. 8: Exploded view of the timing gear and front cover assembly-F, 2F and 3F-E engines



    Click image to see an enlarged view

    Fig. Fig. 9: Exploded view of the timing belt and front cover assembly-3VZ-E engine

     
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