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2003 GMC timing chain cover removal

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Posted on Jan 02, 2017

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SOURCE: I have a 2003 gmc envoy SLT 4.2 L6, and need to

Check this procedure.... Timing Chain & Sprockets-Removal & Installation for 4.2L Engine

NOTE The following procedure requires the use of the Crankshaft Holding tool No. J-44221 and a suitable torque angle meter.

  1. Before servicing the vehicle, refer to the Precautions section.
  2. Remove or disconnect the following:
    Camshaft cover Timing chain (front) cover Tension on the timing chain by moving the tensioner shoe in. Place a tee into the tension to hold the shoe in place. Top chain guide bolts and guide Exhaust camshaft position actuator bolt and actuator Intake camshaft sprocket bolt and sprocket Timing chain Crankshaft sprocket Cylinder head access hole plugs Timing chain tensioner shoe bolt and shoe Timing chain tensioner guide bolts and guide Timing chain tensioner bolts and tensioner
To install:

NOTE Every seventh link of the timing chain is darkened to help in aligning the timing marks.
  1. Install or connect the following:
    Timing chain tensioner and bolts. Tighten to 18 ft. lbs. (25 Nm). Timing chain guide and bolts. Tighten to 89 inch lbs. (10 Nm). Timing chain tensioner shoe and bolt. Tighten to 19 ft. lbs. (26 Nm). Cylinder head access hole plugs and tighten to 44 inch lbs. (5 Nm) Crankshaft Holding tool No. J-44221, or equivalent with the camshaft flats up and the No. 1 cylinder at Top Dead Center (TDC)


    Fig. Proper installation of the crankshaft holding tool with the No. 1 cylinder at TDC (click image for zoom)
    Crankshaft sprocket Intake camshaft sprocket into the timing chain

  2. Align the dark link of the timing chain with the timing mark on the intake camshaft sprocket.Feed the timing chain down through the opening in the head.
    NOTE It may be necessary to remove the crankshaft holding tool to rotate and hold the camshaft hex to align the pin to the camshaft sprocket
    NOTE It may be necessary to remove the crankshaft holding tool to rotate and hold the camshaft hex to align the pin to the camshaft sprocket
    NOTE Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
    Timing chain onto the crankshaft sprocket. Align the dark link of the timing chain with the timing mark on the crankshaft sprocket. Intake camshaft sprocket onto the intake camshaft Intake camshaft washer and bolt Exhaust camshaft actuator into the timing chain. Align the dark link of the timing chain with the timing mark on the exhaust camshaft actuator. Exhaust camshaft actuator onto the exhaust camshaft
  3. Rotate the camshaft actuator clockwise (as seen from the front of the vehicle).
    WARNING The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced.

    Fig. Rotate the camshaft actuator clockwise

  4. Install the exhaust camshaft actuator bolt and tighten to 18 ft. lbs. (25 Nm), plus an additional 135 degrees, using a torque angle meter.
  5. Tighten the intake camshaft sprocket bolt to 22 ft. lbs. (30 Nm), plus an additional 135 degrees, using a torque angle meter.
  6. Remove the tee from the timing chain tensioner to regain tension on the timing chain.
  7. Remove the crankshaft holding tool. The dark lines on the timing chain should be aligned with the marks on the sprockets.


    Fig. The dark lines on the timing chain should be aligned with the marks on the sprockets

  8. Install or connect the following:
    Top chain guide Suitable threadlock to the top chain guide bolt threads, then install and tighten to 89 inch lbs. (10 Nm) Engine front cover Camshaft cover


Posted on Jul 20, 2011


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03 Suzuki aerio need a step by step how to: replace the timing chain! Please help

WOW you work on engines not knowing what is there?
the engines are: 7 engines.!!!
1.3 L I4; 1.5 L I4; 1.6 L I4; 1.8 L I4; 2.0 L I4; 2.3 L I4; 1.4 L Diesel I4 ill guess, ( (die roll)
2.3 L below.

all answers, USA cars, this a USA forum. so.....
ever heard of the FSM the oem factory service manual?

is the chain making noises? if yes, the guide is bad, most chains fail due to that (as a true cause)
the FSM is here , just $4 to look , so ????

the clone is DIY, log in and read like we do.
google , bingo....

now the 2.3L (just the first half, ill let you pay $4 like we do)
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Remove engine assembly from vehicle.
  3. Remove oil pan.
  4. Remove cylinder head cover.
  5. Remove timing chain cover as follows:
    • Remove crankshaft pulley bolt. To lock crankshaft pulley, use special tool 09917-68221 (camshaft pulley holder).
    • Remove crankshaft pulley. To remove crankshaft pulley, use special tools 09944-36011 and 09926-58010 (steering wheel remover and bearing puller attachment).
    • Remove A/C compressor bracket.
    • Remove alternator belt idler pulley, water pump pulley and alternator belt tensioner.
    • Remove timing chain cover bolts and nut.
    • For reinstallation of timing chain, turn crankshaft so that timing marks on cylinder head and lower crankcase match with those on sprockets as shown in figure.
    • Remove second timing chain as follows:
      • Turn crankshaft to meet following conditions.
        • Key (I) on crankshaft is positioned as shown.
        • Arrow mark on idler sprocket (II) points upward.
        • Marks on sprockets (III) match with marks on cylinder head. Note that this step must be followed for reinstallation of timing chain.
      • Remove timing chain tensioner adjuster No.2 and gasket. To remove them, slacken second timing chain by turning intake camshaft counterclockwise a little while pushing back pad.
      • Remove intake and exhaust camshaft timing sprocket bolts. To remove them, fit a spanner to hexagonal part at the center of camshaft to hold it stationary.
      • Remove camshaft timing sprockets and second timing chain.
      • warning
      • After second timing chain is removed, never turn intake camshaft, exhaust camshaft and crankshaft independently more than such an extent as shown. If turned, interference may occur between piston and valves and valves themselves, and parts related to piston and valves may be damaged.
      • Remove timing chain guide No.1.
      • Remove timing chain tensioner adjuster No.1.
      • Remove timing chain tensioner.
      • Remove idler sprocket and first timing chain.
      • Remove crankshaft timing sprocket.
      • end.
    im not doing INSTALL, sorry.

25540491-yqaloxbadhjyikzm2dpnlv4n-2-0.jpg got that? also there are a hole section on details of gasket seals and such, nothing trivial that.

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2. Remove the oil pan.
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4. Remove the two oil pump bolts and the oil pump.


1. Clean and inspect the mating surfaces.
2. Install the oil pump and loosely install the two oil pump bolts.
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1998-2003 To Remove:
  1. Remove or disconnect the following:
    • Crankshaft pulley and hub
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    • Timing chain cover bolts gm_truck_s10_tc.gif

    • Timing chain cover and gasket
  2. Install a bolt in the end of the crankshaft CAUTION
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  3. Rotate crankshaft until the number 1 piston is at Top Dead Center of compression stroke.
  4. Make sure that the alignment marks are aligned with the tabs on the timing chain tensioner. gm-03-22-611.gif

  5. Measure distance between hole in bracket and unworn surface of timing chain tensioner shoe. NOTE: If distance between the hole and unworn surface of timing chain tensioner is greater than 0.314 in (8 mm), replace tensioner, timing chain and sprockets.
  6. Remove timing chain tensioner bolts.
  7. Remove the timing chain, timing chain tensioner and camshaft sprocket at the same time.
  8. Remove the crankshaft sprocket using special tool J 22888-20A or equivalent.
  9. Remove crankshaft sprocket alignment key.

NOTE: If any camshaft components are being replaced to correct a noise problem, all camshaft drive components must be replaced.
To Install:
  1. Install the crankshaft sprocket alignment key.
  2. Install the crankshaft sprocket using special tool J 5590 or equivalent. gm-03-22-613.gif

  3. Compress the timing chain tensioner spring and insert a pin into the tensioner hole to retain the tensioner shoe.
  4. Install timing chain and timing chain tensioner (do not tighten tension bolts).
  5. Align the crankshaft and camshaft timing marks with the tab on the timing chain tensioner.
  6. Tighten the timing chain tensioner bolts.
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  7. Tighten the camshaft sprocket bolt.
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    • Timing chain cover bolts
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    • Drive belt tensioner
    • Crankshaft damper hub and the crankshaft pulley

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