GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H3 🢒 Engine 🢒 Engine Mechanical - 3.7L 🢒 Balance Chain Tensioner Replacement

Removal Procedure

    Object Number: 1403675 Size: SH
  1. Remove the crankshaft rear oil seal housing. Refer to Crankshaft Rear Oil Seal and Housing Replacement .

    2. Important: Every 11 crankshaft rotations, 3 of the 5 dark links on the timing chain will line up with the timing marks.

  2. Rotate the crankshaft until the left hand balance shaft sprocket timing mark (1) is at the 12 o'clock position. The right hand balance shaft sprocket timing mark (2) should be at the 2:30 position. The crankshaft sprocket timing mark (3) should be at the 4:30 position. Make sure the 3 timing marks on the sprockets line up with a dark link on the chain.

    3. Object Number: 953994 Size: SH

    Important: It may be necessary to retract the tensioner plunger by rotating the link plate clockwise. Insert a small tool into the link plate hole in order the prevent the tensioner from ratcheting to full extension.

  3. Remove the balance shaft chain tensioner bolts.
  4. Remove the balance shaft chain tensioner.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 953994 Size: SH
  1. Install a NEW balance shaft chain tensioner and bolts.

    2. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1403675 Size: SH
  2. Verify the correct timing chain timing mark alignments. The left hand balance shaft sprocket timing mark (1) is at the 12 o'clock position. The right hand balance shaft sprocket timing mark (2) should be at the 2:30 position. The crankshaft sprocket timing mark (3) should be at the 4:30 position. The 3 timing marks on the sprockets line up with a dark link on the chain.
  3. Install the crankshaft rear oil seal housing. Refer to Crankshaft Rear Oil Seal and Housing Replacement .