GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Timing Chain

Print

REMOVAL & INSTALLATION



2.2L Engine

See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Timing chain tensioner mounting-2.2L engine



Click image to see an enlarged view

Fig. Fig. 2: Timing chain and gear alignment marks-2.2L engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing chain cover, as outlined earlier in this section.
  4.  
  5. Align the marks on the timing gears before removing the timing chain and gears.
  6.  
  7. Remove the upper camshaft gear retaining bolt.
  8.  
  9. Loosen the timing chain tensioner bolt. DO NOT REMOVE THE BOLT.
  10.  
  11. Remove the camshaft sprocket and the timing chain.
  12.  
  13. If replacing the lower crankshaft gear, install puller J 22888-20 or equivalent and remove the gear.
  14.  

To install:
  1. Clean all the sealing surfaces where the gaskets are installed.
  2.  
  3. Install the lower crankshaft sprocket using J 5590 or the equivalent.
  4.  
  5. Compress the timing chain tensioner spring and install a cotter pin into the retaining hole.
  6.  
  7. Align the crankshaft and timing gears to the marks on the tensioner assembly.
  8.  
  9. Snug up on the tensioner bolt.
  10.  
  11. Align the dowel in the camshaft with the dowel in the camshaft sprocket and install the chain to the gear assemblies.
  12.  
  13. Tighten the timing chain tensioner retaining bolts to 18 ft. lbs. (24 Nm).
  14.  
  15. Tighten the camshaft sprocket retaining bolt to 77 ft. lbs. (105 Nm).
  16.  
  17. Remove the timing chain tensioner cotter pin.
  18.  
  19. Position the timing chain cover to the engine with a new gasket guiding the cover over the dowel pins.
  20.  
  21. Install the timing chain cover, as outlined earlier in this section.
  22.  
  23. Fill all fluid to their proper levels. Connect the negative battery cable, then start the engine and verify proper operation.
  24.  

2.3L Engine

See Figure 3



Click image to see an enlarged view

Fig. Fig. 3: View of the timing chain "timed'' position-2.3L engine

It is recommended that the entire procedure be reviewed before attempting to service this timing chain.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the front timing chain cover and crankshaft oil slinger.
  4.  
  5. Rotate the crankshaft clockwise, as viewed from front of engine (normal rotation) until the camshaft sprockets timing dowel pin holes line up with the holes in the timing chain housing. The mark on the crankshaft sprocket should line up with the mark on the cylinder block. The crankshaft sprocket keyway should point upwards and line up with the centerline of the cylinder bores. This is the normal "'timed'' position.
  6.  
  7. Remove the 3 timing chain guides.
  8.  
  9. Raise the vehicle and support safely.
  10.  
  11. Gently pry OFF timing chain tensioner spring retainer and remove spring.
  12.  

Two styles of tensioner are used. Early production engines will have a spring post and late production ones will not. Both styles are identical in operation and are interchangeable.

  1. Remove the timing chain tensioner shoe retainer.
  2.  
  3. Make sure all the slack in the timing chain is above the tensioner assembly; remove the chain tensioner shoe. The timing chain must be disengaged from the wear grooves in the tensioner shoe in order to remove the shoe. Slide a prybar under the timing chain while pulling shoe outward.
  4.  
  5. If difficulty is encountered removing chain tensioner shoe, proceed as follows:
    1. Lower the vehicle.
    2.  
    3. Hold the intake camshaft sprocket with a holding tool and remove the sprocket bolt and washer.
    4.  
    5. Remove the washer from the bolt and rethread the bolt back into the camshaft by hand, the bolt provides a surface to push against.
    6.  
    7. Remove intake camshaft sprocket using a 3-jaw puller in the 3 relief holes in the sprocket. Do not attempt to pry the sprocket OFF the camshaft or damage to the sprocket or chain housing could occur.
    8.  

  6.  
  7. Remove the tensioner assembly retaining bolts and the tensioner.
  8.  


CAUTION
The tensioner piston is spring loaded and could fly out causing personal injury.

  1. Remove the chain housing to block stud (timing chain tensioner shoe pivot).
  2.  
  3. Remove the timing chain.
  4.  

To install:
  1. Tighten intake camshaft sprocket retaining bolt and washer, while holding the sprocket with tool J-36013 if removed.
  2.  
  3. Install the special tool through holes in camshaft sprockets into holes in timing chain housing. This positions the camshafts for correct timing.
  4.  
  5. If the camshafts are out of position and must be rotated more than 1 / 8 turn in order to install the alignment dowel pins:
    1. The crankshaft must be rotated 90ºclockwise OFF of TDC in order to give the valves adequate clearance to open.
    2.  
    3. Once the camshafts are inPosition and the dowels installed, rotate the crankshaft counterclockwise back to top dead center. Do not rotate the crankshaft clockwise to TDC, or valve or piston damage could occur.
    4.  

  6.  
  7. Install the timing chain over the exhaust camshaft sprocket, around the idler sprocket and around the crankshaft sprocket.
  8.  
  9. Remove the alignment dowel pin from the intake camshaft. Using a dowel pin remover tool, rotate the intake camshaft sprocket counterclockwise enough to slide the timing chain over the intake camshaft sprocket. Release the camshaft sprocket wrench. The length of chain between the 2 camshaft sprockets will tighten. If properly timed, the intake camshaft alignment dowel pin should slide in easily. If the dowel pin does not fully index, the camshafts are not timed correctly and the procedure must be repeated.
  10.  
  11. Leave the alignment dowel pins installed.
  12.  
  13. With slack removed from chain between intake camshaft sprocket and crankshaft sprocket, the timing marks on the crankshaft and the cylinder block should be aligned. If marks are not aligned, move the chain 1 tooth forward or rearward, remove slack and recheck marks.
  14.  
  15. Tighten the chain housing to block stud (timing chain tensioner shoe pivot). the stud is installed under the timing chain. Tighten to 19 ft. lbs. (26 Nm).
  16.  
  17. Reload the timing chain tensioner assembly to its 0 position as follows:
    1. Assemble restraint cylinder, spring and nylon plug into plunger. Index slot in restraint cylinder with peg inPlunger. While rotating the restraint cylinder clockwise, push the restraint cylinder into the plunger until it bottoms. Keep rotating the restraint cylinder clockwise but allow the spring to push it out of the plunger. The pin in the plunger will lock the restraint in the loaded position.
    2.  
    3. Install tool J-36589 or equivalent, onto plunger assembly.
    4.  
    5. Install plunger assembly into tensioner body with the long end toward the crankshaft when installed.
    6.  

  18.  
  19. Install the tensioner assembly to the chain housing. Recheck plunger assembly installation. It is correctly installed when the long end is toward the crankshaft.
  20.  
  21. Install and tighten timing chain tensioner bolts and tighten to 10 ft. lbs. (14 Nm).
  22.  
  23. Install the tensioner shoe and tensioner shoe retainer.
  24.  
  25. REmove special tool J-36589 and squeeze plunger assembly into the tensioner body to unload the plunger assembly.
  26.  
  27. Lower vehicle and remove the alignment dowel pins. Rotate crankshaft clockwise 2 full rotations. Align crankshaft timing mark with mark on cylinder block and reinstall alignment dowel pins. Alignment dowel pins will slide in easily if engine is timed correctly.
  28.  

If the engine is not correctly timed, severe engine damage could occur.

  1. Install the 3 timing chain guides and crankshaft oil slinger.
  2.  
  3. Install the timing chain front cover.
  4.  
  5. Connect the negative battery cable and check for leaks.
  6.  

2.5L, 2.8L and 3.1L Engines

See Figures 4, 5 and 6



Click image to see an enlarged view

Fig. Fig. 4: Timing chain and sprocket removal-2.5L engine



Click image to see an enlarged view

Fig. Fig. 5: Timing chain and sprocket removal-1996 3.1L engine shown



Click image to see an enlarged view

Fig. Fig. 6: You must use a suitable puller to remove the crankshaft sprocket

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing chain front cover assembly, as outlined earlier in this section.
  4.  
  5. Rotate the crankshaft until the timing marks on the crankshaft sprocket and camshaft sprocket locator hole are aligned to the marks on the engine block or timing chain dampener. This is the No. 1 piston at TDC (No. 4 firing position).
  6.  
  7. Unfasten the camshaft sprocket retaining bolt/screw, then remove the camshaft sprocket and the timing chain.
  8.  

If the camshaft sprocket does not come OFF easily, a light blow on the lower edge of the sprocket with a rubber mallet should loosen the sprocket.

  1. Remove the crankshaft sprocket using tool J 23444-A or equivalent puller.
  2.  
  3. If necessary, remove the timing chain dampener retaining bolts, then remove the dampener.
  4.  

To install:
  1. Install the crankshaft sprocket using tool J 38612 until it the sprocket is fully seated on the flange of the crankshaft nose. Apply a coat of Molykote®or equivalent, to the sprocket thrust surface.
  2.  
  3. Hold the camshaft sprocket with the chain hanging down, and align the marks on the camshaft and crankshaft sprockets.
  4.  
  5. If removed, install the timing chain damper to the engine block.
  6.  
  7. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket. Install the camshaft sprocket and chain, use the camshaft sprocket bolts to draw the sprocket on to the camshaft. Tighten the sprocket bolts to 18 ft. lbs. (25 Nm).
  8.  
  9. Lubricate the timing chain with engine oil.
  10.  
  11. Install the front cover assembly, as outlined earlier in this section.
  12.  
  13. Connect the negative battery cable.
  14.  

3.4L Engine

See Figures 7, 8, 9, 10, 11 and 12



Click image to see an enlarged view

Fig. Fig. 7: View of the timing chain and related components with the front cover removed-3.4L engine



Click image to see an enlarged view

Fig. Fig. 8: Retract the timing chain tensioner



Click image to see an enlarged view

Fig. Fig. 9: The special tools must be used ...



Click image to see an enlarged view

Fig. Fig. 10: ... to remove the timing chain, crankshaft sprocket and intermediate shaft sprocket



Click image to see an enlarged view

Fig. Fig. 11: Slide the sprocket and chain on the shafts, maintaining the proper alignment



Click image to see an enlarged view

Fig. Fig. 12: The crankshaft sprocket must be pressed on to specifications using a special tool

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. For 1991 vehicles, perform the following:
    1. Remove the starter motor and flywheel cover.
    2.  
    3. Remove oil pan retaining nuts and bolts. Remove lower frame and powertrain onto transmission table.
    4.  

  6.  
  7. Remove the front cover, as outlined earlier this section.
  8.  
  9. Matchmark the intermediate sprocket, chain link, front face of cylinder and crank sprocket for reference.
  10.  
  11. Retract the timing chain tensioner shoe by using J-33875 or equivalent, on both sides of the tensioner and pulling on the thru pin in the tensioner arm to retract the spring. While spring is retracted, insert a holding tool to hold it.
  12.  
  13. Remove the timing chain tensioner retaining bolts.
  14.  
  15. Raise and safely support the vehicle.
  16.  
  17. Remove the timing chain, crankshaft sprocket and intermediate sprocket using tools J 8433 and J 28611, as shown in the accompanying figure. If the intermediate gear does not slide OFF easily with the timing chain assembly, rotate the crankshaft back and forth to loosen the tight fit.
  18.  
  19. If necessary, remove the timing chain tensioner.
  20.  

To install:
  1. Check to ensure that crankshaft key is installed and fully seated and the chain tensioner is fully installed and blade retracted.
  2.  
  3. Slip both sprockets and chain over the proper shaft and engage the slot in the key. The intermediate shaft may move against the rear cover. Slide the sprocket and chain on the shafts, maintaining the proper alignment shown in the accompanying figure. While installing note the following:
    1. Make sure the rubber and tension blade of the tensioner does not become caught, misaligned, or dislodged.
    2.  
    3. The large chamfer and counterbore of the crankshaft sprocket are installed towards the crankshaft. The intermediate sprocket spline sockets are installed away from the case.
    4.  
    5. The crankshaft sprocket must be pressed on for the final 0.31 in. (8mm) to the seated position using tool J38612 or equivalent, as shown in the accompanying figure.
    6.  
    7. Check to make sure timing was maintained. Remove the retaining pin from tensioner.
    8.  

  4.  
  5. For 1991 vehicles, install the oil pan retaining nuts and bolts, and the flywheel cover and starter.
  6.  
  7. Install the front cover, as outlined earlier in this section.
  8.  
  9. Connect the negative battery cable. Start the engine and check for leaks.
  10.  

3.8L Engints

See Figures 13 and 14



Click image to see an enlarged view

Fig. Fig. 13: Align the timing marks on the sprockets so they are as close as possible



Click image to see an enlarged view

Fig. Fig. 14: Exploded view of the timing chain and related components-3.8L engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing chain front cover assembly, as outlined earlier in this section.
  4.  
  5. Align the timing marks on the sprockets, as shown in the accompanying figure.
  6.  
  7. Remove the timing chain damper.
  8.  
  9. Unfasten the camshaft sprocket bolts, then remove the camshaft sprocket and chain.
  10.  
  11. Remove the crankshaft sprocket. If the sprocket does not come OFF easily, apply a light blow on the lower edge of the sprocket with a plastic mallet.
  12.  

To install:
  1. If the pistons have been moved in the engine, perform the following:
    1. Turn the crankshaft so the No. 1 piston is at Top Dead Center (TDC).
    2.  
    3. Turn the camshaft so, with the sprocket temporarily installed, the timing mark is straight down.
    4.  

  2.  
  3. Assemble the timing chain on the sprockets with the timing marks facing each other.
  4.  
  5. Install the timing chain and sprockets, then tighten the camshaft sprocket bolts to 52 ft. lbs. (70 Nm) plus an additional 110ºturn.
  6.  
  7. Install the timing chain damper and tighten the bolt to 14 ft. lbs. (19 Nm).
  8.  
  9. Rotate the engine 2 revolutions and make sure the timing marks are aligned correctly.
  10.  
  11. Install the front cover assembly, as outlined earlier in this section.
  12.  
  13. Connect the negative battery cable.
  14.  

 
label.common.footer.alt.autozoneLogo