Question about 1998 Buick Skylark

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What is the position for the timing chain gears.

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Timing Chain and Sprockets REMOVAL & INSTALLATION 2.3L and 2.4L Engines The following tools will be required to perform this procedure:

  • Camshaft sprocket timing alignment pins - J 36008 or equivalent
  • Camshaft sprocket wrench - J 39579 or equivalent
  1. Fig. 1: View of the DOHC engine "timed position'' - 2.3L and 2.4L engines what is the position for the timing chain gears. - 86883175.gif
    Fig. 2: View of the SOHC engine "timed position'' - 2.3L engine 86883176.gif
  2. Remove the timing chain guides. There are usually three.
  3. Raise and safely support the front of the vehicle.
  4. Make sure all of the slack is above the tensioner. Gently pry off timing chain tensioner spring retainer, then remove the spring. NOTE: On the 2.3L engine two styles of tensioners 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.
  5. Remove the timing chain tensioner shoe retainer.
  6. 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 suitable small prybar under the timing chain while pulling shoe outward.
  7. If difficulty is encountered while removing chain tensioner shoe, proceed as follows:
    1. Lower the vehicle.
    2. Hold the intake camshaft sprocket with a camshaft sprocket wrench - J 39579 or equivalent holding tool and remove the sprocket bolt and washer.
    3. Remove the washer from the bolt and re-thread the bolt back into the camshaft by hand. The bolt provides a surface to push against.
    4. Remove intake camshaft sprocket using a 3-jaw puller in the 3 relief holes in the sprocket. NOTE: Do NOT try to pry the sprocket off the camshaft or damage to the sprocket or chain housing could occur.
  8. Unfasten the tensioner assembly attaching bolts, then remove the tensioner. CAUTION
    The tensioner piston is spring loaded and could fly out causing personal injury. Use care when removing.
  9. Matchmark the timing chain outer surface for reassembly purposes.
  10. If equipped, remove the chain housing to block stud, which is actually the timing chain tensioner shoe pivot.
  11. Remove the timing chain.
  12. Inspect the parts for wear, then replace if necessary. Some scoring of the timing chain shoe and guides is normal. Clean the old sealant off of the bolt with a wire brush. Clean the threaded hole in the camshaft with a round nylon bristle brush. To install: WARNING
    Failure to following installation procedures can result in severe engine damage.
  13. Install the intake camshaft sprocket onto the camshaft with the marked surface showing. Install the sprocket retaining bolt and washer. Use an adhesive compound 12345493 or equivalent on the bolt. Tighten the bolt to 52 ft. lbs. (70 Nm), while holding the sprocket with tool J-36013, J 39579 or equivalent, if removed.
  14. Install tool J 36800 or equivalent, through hole(s) in the camshaft sprocket(s) into the holes in the timing chain housing. This positions the camshafts for correct timing. Fig. 3: Placing the camshaft sprockets onto the marked surface of the camshaft 91063g30.gif
  15. 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 90°clockwise off of TDC in order to give the valves adequate clearance to open.
    2. Once the camshafts are in position and the dowels installed, rotate the crankshaft COUNTERCLOCKWISE back to TDC. NOTE: Do NOT rotate the crankshaft clockwise to TDC, or valve and piston damage could occur. WARNING
      The side of the timing chain that was marked must be facing outward when installed.
  16. For DOHC engines only, install the timing chain over the exhaust camshaft sprocket, around the idler sprocket and around the crankshaft sprocket.
  17. Remove the alignment dowel pin from the intake (DOHC only) camshaft. Using dowel pin remover tool J 39579 or equivalent, rotate the intake (DOHC only) camshaft sprocket counterclockwise enough to slide the timing chain over the intake (DOHC only) camshaft sprocket. Release the camshaft sprocket wrench. The length of chain between the two 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. Fig. 4: Place the timing chain over the exhaust camshaft and around the idler sprocket and around the crankshaft sprocketDOHwhat is the position for the timing chain gears. - 91063g31.gif91063g31.gif
  18. Leave the alignment dowel pins installed.
  19. Raise and safely support the vehicle.
  20. With slack removed from chain between intake camshaft sprocket (camshaft sprocket for SOHC engines) and crankshaft sprocket, the timing marks on the crankshaft and the cylinder block should be aligned. If marks are not aligned, move the chain one tooth forward or rearward, remove the slack and recheck the marks.
  21. If equipped, tighten the chain housing to block stud. The stud is installed under the timing chain. Tighten to 19 ft. lbs. (26 Nm).
  22. For vehicles through 1991, reload timing chain tensioner assembly to its "zero'' position as follows:
    1. Assemble restraint cylinder, spring and nylon plug into plunger. Index slot in restraint cylinder with peg in plunger. 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. Install tool J-36589 or equivalent, onto plunger assembly.
    3. Install plunger assembly into tensioner body with the long end toward the crankshaft when installed.
  23. For 1992-98 vehicles, reload timing chain tensioner assembly to its "zero'' position as follows:
    1. Form a keeper from a piece of heavy gauge wire. See the accompanying figure.
    2. Apply slight force on the tensioner blade to compress the plunger.
    3. Insert a small prybar into the reset access hole, then pry the racket pawl away from the ratchet teeth while forcing the plunger completely in the hole.
    4. Install the keeper between the access hole and the blade. Fig. 5: View of reloading the timing chain twhat is the position for the timing chain gears. - 86883177.gifembly to its "zero'' position - 1992-98 vehicles 86883177.gif
  24. Install the tensioner assembly to the chain housing. Recheck the plunger assembly installation. It is correctly installed when the long end is toward the crankshaft.
  25. Install and tighten timing chain tensioner bolts. Tighten to 89 inch lbs. (10 Nm).
  26. Install the tensioner shoe and tensioner shoe retainer. Remove the special tool J-36589, then squeeze the plunger assembly into the tensioner body to unload the plunger assembly.
  27. Lower vehicle enough to reach and remove the alignment dowel pins.
  28. Rotate crankshaft clockwise (normal rotation) two full rotations. Align the crankshaft keyway with the mark on the cylinder block, then reinstall the alignment dowel pins. The pins will slide in easily if the engine is timed correctly. WARNING
    If the engine is not correctly timed, severe engine damage could occur.
  29. Install the timing chain guides and, if equipped, the crankshaft oil slinger.
  30. Install the timing chain front cover. For details, please refer to the procedure located in this section.
  31. Connect the negative battery cable, then start the engine and check for oil leaks.

Posted on Oct 07, 2010


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reference autodata chain and and gears timing publication
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Timing set




4.3L, 5.0L, 5.7L and 7.4L Engines
See Figures 1, 2, 3, 4, 5 and 6

  1. Remove the timing cover. This will allow access to the timing chain.
  2. Crank the engine until the timing marks on both sprockets are nearest each other and in line between the shaft centers.

0996b43f80219aca.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Crank the engine until the timing marks on both sprockets are in line

  1. On 1996-98 vehicles remove the crankshaft position sensor reluctor ring, if equipped. On 7.4L engines tool J-41371 or its equivalent puller must be used to remove the reluctor ring.
  2. Take out the bolts that hold the camshaft gear to the camshaft. This gear is a light press fit on the camshaft and will come off easily. It is located by a dowel. The chain comes off with the camshaft gear.

0996b43f80219acb.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Remove the camshaft gear retaining bolts

0996b43f80219acc.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 3: Remove the camshaft gear and timing chain
A gear puller will be required to remove the crankshaft gear.
To install:

  1. Without disturbing the position of the engine, mount the new crankshaft gear on the shaft, and mount the chain over the camshaft gear. Arrange the camshaft gear in such a way that the timing marks will line up between the shaft centers and the camshaft locating dowel will enter the dowel hole in the cam sprocket.
  2. Place the cam sprocket, with its chain mounted over it, in position on the front of the truck and pull up with the three bolts that hold it to the camshaft.
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When installing the crankshaft position sensor you must use install a new oil ring seal onto the sensor.
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0996b43f80219acd.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 4: A gear puller will be required to remove the crankshaft gear

0996b43f8020d5d9.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: Timing mark alignment-4.3L, 5.0L, 5.7L and 7.4L engines

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Timing Chain and Gears REMOVAL & INSTALLATION 2.2L Engine Fig. 1: The timing marks on the sprockets should be in alignment. If not, turn the crankshaft until the marks are aligned 91113p63.jpg
Fig. 2: The timing chain tensioner is retained by a Torx head bolt (1) and a regular hex head bolt (2) 91113p58.jpg
Fig. 3: Unfasten the camshaft sprocket bolt 91113p59.jpg
Fig. 4: Remove the camshaft sprocket and the timing chain at the same time . . . 91113p60.jpg
Fig. 5: . . . then remove the tensioner assembly 91113p61.jpg
Fig. 6: Compress the tensioner spring and insert a cotter pin or nail in the hole provided to hold the tensioner in position 91113p62.jpg
  1. Fig. 7: Exploded view of the timing chain and sprockets - 2.2L OHV engine 87953107.gif
2.3L and 2.4L Engines .
  1. Fig. 8: The chain must be in the "timed'' position - 2.3L and 2.4L engines 87953108.gif
    Fig. 9: Remove the timing chain guides 87953109.gif

  2. .
  3. Fig. 10: Timing chain assembly retaining bolts - 2.3L and 2.4L engines 87953111.gif

  4. .
    1. Fig. 11: Reloading the tensioner to its "ZERO'' position, then install to the chain housing 87953110.gif

prev.gif next.gif

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2005 f250 5.4 gas need to know specs for timing a diagram would be awesome

To Install:
  1. Install balance shaft drive gear onto the left camshaft.
  2. Install the camshaft sprockets and new bolts finger tight.
  3. Using a vise, compress the timing chain tensioner plunger.
  4. Install a retaining clip on the tensioner to hold plunger IN during installation.
    marking timing chain a0038720.gif

  5. If timing chain copper links are not visible, mark 2 links on one end and 1 link on the other end to be used as timing marks.
  6. Install right and left timing chain guides. Tighten bolts to 89 in-lbs (10 Nm).
  7. Rotate the left camshaft until the timing mark is at the 12 o'clock position.
  8. Rotate the right camshaft until the timing mark is at the 11 o'clock position.
  9. Position the crankshaft using the special tool. Then remove the tool.
    Crankshaft special tool positioning n0013602.gif

  10. Install the crankshaft sprocket with flange facing forward.
    Crankshaft sprocket timing mark n0011528.gif

  11. Position lower end of left (inner) timing chain on the crankshaft sprocket. Align the copper (or marked) chain link with the timing mark on the outer flange of the crankshaft pulley. NOTE: Upper half of timing chain must be below the tensioner arm dowel.
  12. Position the left timing chain on the camshaft sprocket. The timing mark on the camshaft sprocket must be aligned between the 2 copper (or marked) chain links.
    Left camshaft sprocket timing mark a0080774.gif

  13. Place the left timing chain tensioner arm on the dowel pin and install the timing chain tensioner and bolts. Tighten bolts to 18 ft-lbs (25 Nm). NOTE: Lower half of timing chain must be above the tensioner arm dowel.
    Crankshaft sprocket timing mark a0079624.gif
  14. Position lower end of right (outer) timing chain on the crankshaft sprocket. Align the copper (or marked) chain link with the timing mark on the outer flange of the crankshaft pulley.
    Right camshaft sprocket timing mark a0041104.gif

  15. Position the right timing chain on the camshaft sprocket. The timing mark on the camshaft sprocket must be aligned between the 2 copper (or marked) chain links.
  16. Place the right timing chain tensioner arm on the dowel pin and install the timing chain tensioner and bolts. Tighten bolts to 18 ft-lbs (25 Nm).
  17. Remove the retaining clips from the right and left timing chain tensioners.
  18. Verify alignment of all timing marks.
  19. Install crankshaft sensor ring on crankshaft.
  20. Locate index mark on balance shaft and mark corresponding gear tooth with chalk.
  21. Position balance shaft on journals. NOTE: It may be helpful to use an inspection mirror to view the marks timing marks.
  22. Align the chalk mark on the balance shaft with the camshaft timing mark.
    Balance shaft bearing caps n0007112.gif

  23. Install the balance shaft bearing caps in their original locations. Follow the tightening sequence as shown in the illustration. Tighten bolts to 89 in-lbs (10 Nm).
  24. Tighten the camshaft phaser sprocket bolts in the correct sequence using 2 steps, as follows:
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    • Step 2-tighten an additional 90 degrees
  25. Position the crankshaft keyway in the 11 o'clock position.
  26. Lubricate and install all camshaft roller followers. WARNING
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During most engine rebuilds, a completely new timing assembly should be installed. If wear exists on any component, replacement of the entire assembly is necessary. Wear in the chain, gears, or sprockets means a timing lag, which results in poor engine performance.
The timing chain or belt is generally installed with the gears in their correct positions. Before installing a new chain, soak it in oil.
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Some OHC engines use a chain drive; others use a belt drive. Removing the cover on some OHC engines that have timing chains is more difficult, because the cover often fits between the oil pan and the cylinder head. There are special procedures for replacing cam timing components in these engines.
Before a chain repair job, perform a leakage test on non-freewheeling engines to check for bent valves, so that an accurate repair estimate can be made.
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On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another. NOTE THIS IS FOR 2WD 4.0

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