Question about 2003 GMC Yukon Denali

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How to remove 2003 yukon denally heads 6.0L

Need to remove heads to remove broken header bolts, they broke on their own. I want to know if I have to set motor at TDC.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: Bolt torque Specs

30 foot pounds

Posted on May 02, 2009

  • 7353 Answers

SOURCE: 2003 yukon denali. Speedometer broke. What needs

can you be more specific than "broke"...... does the odometer work? do all the other gauges work? if not, are they accurate.

Posted on Oct 15, 2009

  • 212 Answers

SOURCE: are the removal bolts on the brake caliper the 5/8

All newer GM vehicles bolts would be metric mm

Posted on Feb 02, 2010

dmsr63
  • 2050 Answers

SOURCE: i need to know where is the #1 spark plug on a 1998 gmc yukon

V8 engine? That would be drivers side front. Remember that TDC is number one piston up (On the compression stroke, not exhaust stroke), timing marks at zero.

Posted on Jun 05, 2010

ZJLimited
  • 17970 Answers

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)

    zjlimited_1612.jpg

    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.
    zjlimited_504.gif

    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.

    zjlimited_1613.jpg

    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


continue...

Posted on Jul 20, 2011

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