GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H3 🢒 Engine 🢒 Engine Mechanical - 3.7L 🢒 Timing Chain Guide Replacement - Lower

Removal Procedure
  1. Remove the timing chain tensioner shoe. Refer to Timing Chain Tensioner Shoe Replacement.
  2. Slide the crankshaft sprocket from the crankshaft sprocket snout, in order to gain slack in the timing chain to remove the lower timing chain guide.

    3. Object Number: 637770 Size: SH
  3. Remove the cylinder head access hole plug.

    4. Object Number: 637585 Size: SH
  4. Remove the lower timing chain guide bolts.
  5. Remove the lower timing chain guide from the engine.

Installation Procedure

    Object Number: 637585 Size: SH
  1. Position the lower timing chain guide to the engine.

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the lower timing chain guide bolts.

    3. Tighten
    Tighten the bolts to 18 N·m (13 lb ft).


    Object Number: 637770 Size: SH
  3. Install the cylinder head access hole plug.

    4. Tighten
    Tighten the plug to 5 N·m (44 lb in).

  4. Install the crankshaft sprocket to the crankshaft sprocket snout.

    5. Aligning the marked link on the timing chain with the timing mark on the crankshaft sprocket.

  5. Install the timing chain tensioner shoe. Refer to Timing Chain Tensioner Shoe Replacement.