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Timing Belt: Installation

WARNING: This page is about a different car, the 1999 Cadillac Catera and 1998 Cadillac Catera. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When installing a new or used timing belt, the directional arrows on the timing belt must be matched with the rotation of the crankshaft. If this precaution is not observed, excessive wear and timing belt failure may occur.
IMPORTANT: Guide marks are printed on the timing belt to aid in installation. If these marks are not identifiable, install a new belt. Install the timing belt with the engine at room temperature. Do not crimp or bind the timing belt when handling or installing.
  1. To install, remove J 42069 crankshaft holder.
  2. Raise and support vehicle.
  3. Start at the crankshaft sprocket and install the timing belt with the double dash (TDC) mark on the belt aligned with the marks on the oil pump and on the belt drive gear.
  4. Install Timing Belt Holder (J42069-30) to pinch belt and prevent teeth from jumping during installation. See Fig 1.
    Fig 1: Timing Belt Holder J42069-30 Installed And Timing Belt Marks Aligned On Crankshaft Drive Pulley
    GM345370Courtesy of GENERAL MOTORS CORP.
  5. Lower vehicle.
  6. Route the timing belt through the timing belt tensioner (2).
  7. Slip the timing belt through camshaft gears 1 and 2 simultaneously (3), ensuring the dash marks on the timing belt align with the marks on the camshaft gears and the notches on the rear timing belt cover.
  8. Route the timing belt through the idler pulley for camshafts 1 and 2 (4).
  9. Route the timing belt through the idler pulley for camshafts 3 and 4 (5).
  10. Slip the timing belt through camshaft gears 3 and 4 simultaneously (6), ensuring the dash marks on the timing belt align with the marks on the camshaft gears and the notches on the rear timing belt cover.
    11. Fig 2: Identifying Timing Belt Components
    GM345867Courtesy of GENERAL MOTORS CORP.
  11. Measure the timing belt deflection between camshaft gear number 4 and the idler pulley for camshafts 3 and 4, the deflection must be no more than 0.4 in (10 mm). See Fig 3.
    12. Fig 3: Measuring Belt Deflection
    GM345373Courtesy of GENERAL MOTORS CORP.
  12. If timing belt deflection adjustment is necessary:
    • 12.1 Turn the timing belt idler pulley nut for camshafts 3 and 4 COUNTERCLOCKWISE, with J 42069-40 until the high point of the nut is in approximately the 12 o'clock position.
    • 12.2 Tighten the idler pulley locking bolt, while holding the nut with J 42069-40, until snug. The idler pulley bolt will be tightened to specifications after all final adjustments are made.
    13. Fig 4: Idler Pulley Nut For Camshafts 3 And 4 At 12 O'Clock Position
    GM345386Courtesy of GENERAL MOTORS CORP.
  13. Apply additional tension to the timing belt, at the idler pulley for camshafts 1 and 2, by turning the high point of the nut to approximately the 9 o'clock position. Then, tighten the idler pulley locking bolt, while holding the nut with J 42069-40, until snug. The idler pulley bolt will be tightened to specifications after all final adjustments are made.
  14. Set the initial timing belt tension:
    • 14.1. Turn the tensioner nut COUNTERCLOCKWISE to full stop, then, turn the nut back until the reference mark is 0.003 in (1 mm) over the flange.
    • 14.2. Tighten the timing belt tensioner locking nut until snug, the locking nut will be tightened to specifications after all final adjustments are made.
    15. Fig 5: Setting Initial Timing Belt Tension
    GM345812Courtesy of GENERAL MOTORS CORP.
  15. Inspect the alignment marks on the timing belt to ensure that they are aligned with the appropriate reference points on the camshaft gears, the rear timing belt cover and on the oil pump housing. See Fig 6
    16. Fig 6: Identifying Timing Belt Alignment Marks On Belt
    G97B03706Courtesy of GENERAL MOTORS CORP.
  16. Remove Timing Belt Aligner(s) (J42069-30, J42069-1 and J42069-2).
  17. Using Crank Hub Socket (J42098), rotate engine clockwise, two revolutions, stopping at 60 degrees Before Top Dead Center (BTDC). See Figure.
    18. Fig 7: Identifying Timing Belt Timing Adjustment Service Tools
    GM345814Courtesy of GENERAL MOTORS CORP.
  18. Install Timing Belt Aligner (J42069-10), onto crankshaft sprocket with knurled knob.
  19. Turn crankshaft until lever of aligner firmly touches water pump pulley flange.
  20. Secure the moveable lever of the tool to the water pump pulley flange.
    IMPORTANT: The alignment marks on the timing belt will no longer align with the marks on the camshaft gears after one or more engine revolutions.
  21. Inspect the alignment of the reference marks on the camshaft gears with the notches on the rear timing belt cover, as well as, the mark on the crankshaft sprocket and oil pump housing.
  22. Use the J 42069-20 to inspect the alignment of camshaft gears 3 & 4.
  23. Use the J 42069-20 to inspect the alignment of camshaft gears 1 & 2.
  24. If timing belt adjustment IS required, refer to Timing Belt Timing Adjustment 
  25. If timing belt adjustment IS NOT required, set the final timing belt tension:
    • 25.1. Loosen the timing belt tensioner locking nut.
    • 25.2. Turn the locking nut counterclockwise to full stop, then back until the reference mark is 0.078-0.157 in (2-4 mm) ABOVE the reference mark on the flange. Tighten the timing belt tensioner locking nut 15 lb ft (20 N.m).
    • 25.3. Hold the timing belt idler pulley nut in place for camshafts 1 & 2 and 3 & 4 with the J 42069-40. Tighten both idler pulley bolts to 30 lb ft (40 N.m).
    26. Fig 8: View Of Eccentric And Reference Mark On Flange
    GM345835Courtesy of GENERAL MOTORS CORP.
  26. Inspect the highpoints of the timing belt tensioner nut. The idler pulley nut high point for camshafts 3 and 4 will be in approximately the 12 o'clock position. The idler pulley nut high point for camshafts 1 and 2 will be in approximately the 9 o'clock position.
    27. Fig 9: Idler Pulley Nut High Point For Camshafts 3 And 4 At 12 O'Clock Position, High Point For Camshafts 1 And 2 At 9 O'Clock Position
    GM345386Courtesy of GENERAL MOTORS CORP.
  27. Remove the J 42069-20 and the J 42069-10.
  28. For final inspection, rotate the engine in the clockwise direction two revolutions until reaching 60 degrees BTDC.
  29. Install the J 42069-10 to the crankshaft sprocket with the knurled bolt.
    30. Fig 10: J 42069-10 Installed to crankshaft sprocket And Waterpump Flange
    GM345377Courtesy of GENERAL MOTORS CORP.
  30. Turn the crankshaft until the lever of the J 42069-10 firmly contacts the water pump pulley flange.
  31. Secure the moveable lever of the tool to the water pump pulley flange.
  32. Inspect the alignment of the reference marks on the camshaft gears with the notches on the rear timing belt cover, as well as, the mark on the crankshaft gear and the mark on the oil pump housing.
  33. Use the J 42069-20 to inspect the alignment of camshaft gears 3 and 4.
  34. Use the J 42069-20 to inspect the alignment of camshaft gears 1 and 2.
  35. If the reference marks on the camshaft gears do not match exactly, adjust the timing belt. Refer to TIMING BELT TIMING ADJUSTMENT .
  36. If the reference marks match exactly and further timing belt adjustment IS NOT necessary, continue with reassembly of the engine.
  37. Ensure all tools are removed from the engine
  38. Install the crankshaft balancer to the crankshaft sprocket. Tighten the crankshaft balancer bolts to 15 lb ft (20 N.m).
    39. Fig 11: Removing & Installing Crankshaft Balancer
    GM217342Courtesy of GENERAL MOTORS CORP.
  39. Install the timing belt cover. Refer to FRONT TIMING BELT COVER  Replacement
  40. Install the intake plenum. Refer to See INTAKE PLENUM 
  41. Install the Intake Air Resonator, vacuum hoses, electrical connectors and MAF sensor in reverse order of disassembly under Removal.
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