LS400 1990-1997

Timing Belt Cover

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Precautions



Specific to:

Lexus LS400 1993-1996


CAUTION
On models with an air bag, wait at least 90 seconds from the time that the ignition switch is turned to the LOCK position and the battery is disconnected before performing any further work.

Removal & Installation



Specific to:

Lexus LS400 1993-1997

  1. Disconnect the negative battery cable and the positive battery cable. Remove the battery.
  2.  
  3. Remove the air duct and dust covers. Remove the engine undercover.
  4.  
  5. Drain the cooling system. Remove the drive belt, fan, fluid coupling and fan pulley.
  6.  
  7. Remove the radiator, air cleaner and throttle body cover. Remove the air intake connector pipe.
  8.  
  9. Remove the air conditioning compressor and power steering pump. Do not disconnect the hoses.
  10.  
  11. Remove the upper high tension cord cover and the right side engine wire cover.
  12.  
  13. Disconnect the PCV hose and remove the left side engine wire cover. Remove the right side No. 3 timing cover.
  14.  
  15. Disconnect and tag the vacuum hoses and remove the left side engine wire cover. Disconnect the spark plug wires.
  16.  
  17. Remove the bolt, cover plate and idler pulley.
  18.  
  19. Disconnect the camshaft position sensor connector and remove the right side No. 2 timing belt cover.
  20.  
  21. Disconnect and remove the ignition coil. Disconnect the hoses and wires from the water bypass pipe. Remove the water bypass pipe.
  22.  
  23. Disconnect the camshaft position sensor connector and remove the left No. 2 timing belt cover.
  24.  
  25. Remove the distributor caps and rotors. Disconnect and remove both distributor housings.
  26.  
  27. Disconnect and remove the alternator. Remove the drive belt tensioner and the spark plugs.
  28.  
  29. Turn the crankshaft pulley and align it's groove with the timing mark 0 of the No. 1 timing cover. Check that the timing marks of the camshaft timing pulleys and timing belt rear plates are aligned. If not, turn the crankshaft 1 full revolution (360 degrees).
  30.  
  31. Remove the timing belt tensioner. Using the proper tool, loosen the tension between the left side and right side timing pulleys by slightly turning the left side camshaft clockwise.
  32.  
  33. Disconnect the timing belt from the camshaft timing pulleys. Using the proper tool, remove the bolt and the timing pulleys.
  34.  
  35. Remove the bolt and the crankshaft pulley with the proper tool. Remove the fan bracket. Remove the hydraulic pump on the SC400.
  36.  
  37. Remove the mounting bolts and the No. 1 timing belt cover.
  38.  

To install:

  1. Install the timing belt guide (No. 1 crank angle sensor plate) with the cup side facing forward. Replace the timing belt cover spacer.
  2.  
  3. Install the No. 1 timing belt cover and tighten the mounting bolts. Install the hydraulic pump on the SC400. Install the fan bracket.
  4.  
  5. Align the pulley set key on the crankshaft with the key groove of the pulley. Install the pulley, using the proper tool to tap in the pulley. Tighten the pulley bolt to 181 ft. lbs. (245 Nm).
  6.  
  7. Align the knock pin on the right side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the right side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  8.  
  9. Align the knock pin on the left side camshaft with the knock pin of the timing pulley. Slide on the timing pulley with the left side mark facing forward. Tighten the bolt to 80 ft. lbs. (108 Nm).
  10.  
  11. Turn the crankshaft pulley and align it's groove with the 0 timing mark on the No. 1 timing belt cover. Using the proper tool, turn the crankshaft timing pulley and align the timing marks of the camshaft timing pulley and the timing belt rear plate.
  12.  
  13. Install the timing belt to the left side camshaft timing pulley by:
    1. Using the proper tool, slightly turn the left side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the left side camshaft pulley.
    2.  
    3. Using the proper tool, align the timing marks of the left side camshaft pulley and the timing belt rear plate.
    4.  
    5. Check that the timing belt has tension between crankshaft timing pulley and the left side camshaft pulley.
    6.  

  14.  
  15. Install the timing belt to the right side camshaft timing pulley by:
    1. Using the proper tool, slightly turn the right side timing pulley clockwise. Align the installation mark of the timing belt with the timing mark of the camshaft timing pulley and hang the timing belt on the right side camshaft pulley.
    2.  
    3. Using the proper tool, align the timing marks of the right side camshaft pulley and the timing belt rear plate.
    4.  
    5. Check that the timing belt has tension between crankshaft timing pulley and the right side camshaft pulley.
    6.  

  16.  
  17. The timing belt tensioner must be set prior to installation. The tensioner can be set by:
    1. Place a plate washer between the tensioner and a block. Using a suitable press, press in the pushrod using 220-2205 lbs. of pressure.
    2.  
    3. Align the holes of the pushrod and housing, pass the proper tool (an 1.27mm Allen wrench) through the holes to keep the setting position of the pushrod.
    4.  
    5. Release the press and install the dust boot to the tensioner.
    6.  

  18.  
  19. Install the tensioner and tighten the bolts to 20 ft. lbs. (26 Nm). Remove the tool from the tensioner.
  20.  
  21. Turn the crankshaft pulley 2 complete revolutions from TDC to TDC. Always turn the crankshaft clockwise. Check that each pulley aligns with the timing marks.
  22.  
  23. Install the spark plugs and tighten to 13 ft. lbs. (18 Nm). Install the drive belt tensioner and tighten the bolt to 12 ft. lbs. (16 Nm).
  24.  
  25. Install the alternator and engine wire bracket. Tighten the nut and bolt to 26 ft. lbs. (35 Nm) on the LS400 or 27 ft. lbs. (37 Nm) on the SC400. Connect the electrical connections at the alternator.
  26.  
  27. Install both distributor housings and tighten the mounting bolts to 13 ft. lbs. (18 Nm). Replace the distributor rotors and caps.
  28.  
  29. Install the right side No. 2 timing belt cover and tighten the 10mm bolts to 69 inch lbs. (8 Nm) and the 12mm bolts to 12 ft. lbs. (16 Nm). Connect the camshaft position sensor connector.
  30.  
  31. Install the left side No. 2 timing belt cover and connect the camshaft position sensor connector.
  32.  
  33. Install the water bypass pipe and connect the hoses and connectors.
  34.  
  35. Replace the left side ignition coil and connect the coil connector. Install the idler pulley and cover plate. Tighten the bolt to 27 ft. lbs. (37 Nm).
  36.  
  37. Install and secure the ignition wires. Install the right side No. 3 timing belt cover.
  38.  
  39. Install the left side No. 3 timing belt cover and connect the vacuum hose and connectors. Install the right side engine wire cover.
  40.  
  41. Install the left side engine wire cover and connect the vacuum hoses.
  42.  
  43. Install the upper high tension cord covers. Fit the front side claw groove of the upper cover to claw of the lower cover.
  44.  
  45. Install the power steering pump and the air conditioning compressor.
  46.  
  47. Install the throttle body cover and the air cleaner.
  48.  
  49. Install the radiator, fan pulley, fan coupling, fan and drive belt.
  50.  
  51. Install the engine undercover and replace the battery.
  52.  
  53. Install the air ducts and dust covers. Connect the battery cables.
  54.  
  55. Refill the cooling system. Check the ignition timing.
  56.  

 
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