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I AM CHANGING THE TIMING BELT ON MY SONS 1990 tOYOTA cOROLLA, AND i NEED TO KNOW HOW TO SET THE TIMING.

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  • dschoessow00 Aug 06, 2010

    I only have one external sprocket not two

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  • Toyota Master
  • 17,970 Answers

Timing Belt and Sprockets - REMOVAL & INSTALLATION


4A-GE Engine
(see Figures 1 through 11)

  1. Disconnect the negative battery cable. Remove the timing belt covers.
  2. Remove the timing belt guide from the crankshaft pulley.
i AM CHANGING THE TIMING - 44a8856.jpg

Fig. 1: Prior to belt removal, inspect all components and matchmark for installation-4A-GE engine (clic for zoom)


If reusing the timing belt, draw a direction arrow on the belt (in the direction of engine revolution), and place matchmarks on the pulleys and belt.
  1. Loosen the timing belt idler pulley, move it to the left (to take tension off the belt) and tighten its bolt.
f5e6723.jpg

Fig. 2: Loosen the idler pulley bolt and push it as far to the left as it will go, tighten it, remove the belt ...
  1. Carefully slip the timing belt off the pulleys.
Do not disturb the position of the camshafts or the crankshaft during removal.
  1. Remove the idler pulley bolt, pulley and return spring.
b5e862d.jpg

Fig. 3: ... then remove the idler pulley bolt, pulley, and tension spring-4A-GE engine
  1. Remove the crankshaft timing pulley.
  2. Remove the PCV hose and the valve cover.
  3. Use an adjustable wrench to counterhold the camshaft. Be careful not to damage the cylinder head. Loosen the center bolt in each camshaft pulley and remove the pulley. Label the pulleys and keep them clean. 44fec84.jpg

    Fig. 4: Secure the camshaft and remove the pulley bolt
    1. Check the timing belt carefully for any signs of cracking or deterioration. Pay particular attention to the area where each tooth or cog attaches to the backing of the belt. If the belt shows signs of damage, check the contact faces of the pulleys for possible burrs or scratches.
    2. Check the idler pulley by holding it in your hand and spinning it. It should rotate freely and quietly. Any sign of grinding or abnormal noise indicates the pulli AM CHANGING THE TIMING - e401bab.jpge replaced.
    e401bab.jpg

    Fig. 5: Inspect the smoothness of the idler pulley
    1. Check the free length of the tension spring. Correct length is 1.713 inch. (43.5mm) measured at the inside faces of the hooks. A spring which has stretched during use will not apply the correcti AM CHANGING THE TIMING - d11ea7f.jpg the pulley; replace the spring.
    d11ea7f.jpg

    Fig. 6: Measure the free length of the tension spring-4A-GE engine
    1. If you can test the tension of the spring, look for 22 lbs. of tension at 50mm of length. If in doubt, replace the spring.
    To install:
    1. Align the camshaft knock pin and the pulley. Reinstall the camshaft timing belt pulleys, making sure the pulley fits properly on the shaft and that the timing marks align correctly. Tighten the center bolt on each pulley to 43 ft. lbs.(58 Nm). Be careful not to damage the cylinder head during installation.
    2175aba.jpg

    Fig. 7: Position the knock pin of the camshafts as shown-4A-GE engine (click for zoom)
    1. Before reinstalling the belt, double check that the crank and camshafts are exactly in their correct positions. The alignment marks on the pulleys should align with the cast marks on the head and oil pump.
    2. Reinstall the valve covers with new gaskets and attach PCV hose.
    3. Install the timing belt idler pulley and its tensioning spring. Move the idler to the left and temporarily tighten its bolt.
    4. Carefully observing the matchmarks made earlier, install the timing belt onto the pulleys.
    5. Slowly release tension on the idler pulley bolt and allow the idler to take up tension on the timing belt. DO NOT allow the idler to slam into the belt; the belt may become damaged.
    63bdcd8.jpg

    Fig. 8: Set the No. 1 cylinder to TDC of the compression stroke-4A-GE engine (click for zoom)
    1. Temporarily install the crankshaft pulley bi AM CHANGING THE TIMING - 7a9a938.jpghe engine clockwise through two complete revolutions, stopping at TDC. Check that each pulley aligns with its marks.
    7a9a938.jpg

    Fig. 9: Temporarily tighten the crankshaft pulley bolt, then turn it 2 revolutions from TDC to TDC-4A-GE engine

    continue...

Posted on Aug 06, 2010

  • 2 more comments 
  • ZJ Limited
    ZJ Limited Aug 06, 2010






    1. Check the tension of the timing belt at a top point halfway
      between the two camshaft sprockets. The correct deflection is 4mm at 4.4
      lbs. pressure (2 kg). If the belt tension is incorrect, readjust it by
      repeating the previous steps. If the tension is correct, tighten the
      idler pulley bolt to 27 ft. lbs. (37 Nm).



    2. Remove the crankshaft pulley bolt.










    Fig. 10: Check that each pulley aligns with the timing marks-4A-GE engine






    1. Install the timing belt guide onto the crankshaft timing pulley. Make sure that the cup side is facing outward.










    Fig. 11: Install the timing belt guide onto the crankshaft pulley, cup side facing outward-4A-GE engine





    1. Install the timing belt covers.

    Hope helps.


  • dschoessow00 Aug 06, 2010

    I only have one external cam sprocket not two.

  • ZJ Limited
    ZJ Limited Aug 06, 2010


    4A-F Engine
    (see Figures 12 through 22)




    1. Disconnect the negative battery cable.


    2. Raise and support the vehicle. Remove the RH wheel and RH engine splash shield.


    3. Lower the vehicle slightly and support the one side with jackstands. Remove the air cleaner assembly.


    4. Loosen the water pump pulley bolts and slide off the alternator drive belt. Remove all other drive belts.


    5. Remove the spark plugs.


    6. Remove the valve cover from the cylinder head. Discard all gaskets.


    7. Set the No. 1 cylinder to TDC of the compression stroke.


    8. Turn the crankshaft pulley and align its groove with the No. 1
      timing belt cover. Check that the valve lifters on the No. 1 cylinder
      are loose. If not, turn the crankshaft pulley one complete revolution.



    9. Remove the RH engine mounting insulator. Set the jack to the
      engine with a piece of wood between the jack and engine. Remove the
      mounting bolts and stay. Remove the bolt, two nuts, through bolt and RH
      mounting.



    10. Remove the water pump pulley.


    11. Using a special tool, retain the crankshaft pulley, then remove the pulley bolt. Remove the crankshaft pulley.


    12. Unbolt the timing belt covers and remove them from the engine.


    13. Remove the timing belt guide.










    Fig. 12: Draw a direction arrow on the belt (in the direction of revolution) if reusing it-4A-F engine






    1. To remove the timing belt and idler pulley, loosen the idler
      pulley bolt. Push it to the left as far as possible, then temporarily
      tighten it. Remove the timing belt. Now remove the pulley bolt, pulley
      and return spring.











    Fig. 13: Loosen the idler pulley bolt











    Fig. 14: Push the pulley left as far as it will go, then tighten-4A-F engine











    Fig. 15: Remove the timing belt from above the engine. Note the direction of the arrow






    1. Remove the crankshaft timing pulley.


    2. To remove the camshaft timing pulleys, secure the camshaft and
      remove the pulley bolt. Be careful not to damage the cylinder head with
      the wrench.










    http://repairguide.autozone.com/znetrgs/...">Fig. 16: Secure the camshaft and remove the camshaft pulley bolt-4A-F engine


    To install:




    1. Check the idler pulley by holding it in your hand and spinning it.
      It should rotate freely and quietly. Any sign of grinding or abnormal
      noise indicates the pulley should be replaced.



    2. Check the free length of the tension spring. Correct length is
      1.512 inch. (38.4mm) measured at the inside faces of the hooks. A spring
      which has stretched during use will not apply the correct tension to
      the pulley; replace the spring.












    Fig. 17: Measure the free length of the tension spring-4A-F engine





    When reinstalling, make certain that the gaskets and their mating
    surfaces are clean and free from dirt and oil. The gasket itself must be
    free of cuts and deformations and must fit securely in the grooves of
    the covers.






    1. Align the camshaft knock pin and camshaft timing pulley. Secure
      the camshaft and tighten the camshaft timing pulley bolt. Align the
      bearing cap mark and the center of the small hole on the camshaft timing
      pulley. Remove any oil or water on the camshaft pulley and keep it
      clean.











    Fig. 18: Secure the camshaft and tighten the pulley bolt-4A-F engine






    1. Install the camshaft timing pulley and align the TDC marks on the oil pump body and crankshaft timing pulley.










    Fig. 19: Align the bearing cap mark and the center small hole on the camshaft timing pulley-4A-F engine











    Fig. 20: Align the marks on the oil pump body and crankshaft timing pulley-4A-F engine






    1. Temporarily install the timing belt idler pulley with the mounting
      bolt. Install the tension spring. Pry the timing belt idler pulley
      toward the left as far as it will go and temporarily tighten it.












    Fig. 21: Install the idler pulley and tension spring, prying the pulley toward the left-4A-F engine






    1. Install the timing belt.










    Fig. 22: Install the timing belt. Remember the direction arrow-4A-F engine



    continue....

  • ZJ Limited
    ZJ Limited Aug 06, 2010


    23. Check the valve timing and belt tension. Loosen the timing belt idler pulley mounting bolt. Temporarily install the crank pulley bolt and turn the crankcase two revolutions clockwise from TDC to TDC. Check the valve timing. Insure that each pulley aligns with the marks as shown in the illustration.
    24. Tighten the timing belt idler pulley bolt to 27 ft. lbs. (37 Nm). Remove the temporarily install cranks pulley bolt.
    25. Measure the timing belt deflection at the SIDE point, looking for 0.20-0.24 inch (5-6mm) of deflection at 4.4 pounds of pressure (2 kg). If the deflection is not correct, readjust the idler pulley.
    26. Install the timing belt guide facing the cup side outward.
    27. Attach the timing belt covers, tighten the mounting bolts.
    28. Whe installing the crankshaft pulley, apply a light coat of engine oil on the threads and heads under the pulley set bolt. Align the pulley set key with the key groove of the pulley and install. Tighten the mounting bolt to 87 ft. lbs. (118 Nm).
    29. Temporarily install the water pump pulley.
    30. With the jack still in position, install the RH engine mounting insulator to the engine mounting bracket. Align the RH insulator with the body bracket and secure with the through bolt and nut. Tighten the bolt to 47 ft. lbs. (64 Nm), the nut to 38 ft. lbs. (52 Nm) and the through bolt to 64 ft. lbs. (87 Nm). Attach the RH mounting stay and tighten the bolts to 31 ft. lbs. (42 Nm). Remove the jack.
    31. Insatall the valve cover with a new gasket and cap nuts.
    32. Install the spark plugs, tighten them, to 13 ft. lbs. (18 Nm).
    33. Place all drive belts into position and adjust.
    34. Tighten the water pump pulley bolt.
    35. insatall the air cleaner. RH splash shield and RH wheel.
    36. Lower the vehicle, check the fluids levels. Connect the negative battery cable.
    37. Test drive the vehicle.

    Hope this helps.

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