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Home >> Buick >> 2015 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 2.4L (Lea)) >> Repair Instructions - On Vehicle >> Timing Chain Tensioner Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Inspect the timing chain tensioner. If the timing chain tensioner is damaged, replace the timing chain tensioner.
    2. Fig 1: Timing Chain Tensioner Length
    GM2557065Courtesy of GENERAL MOTORS COMPANY
  2. Measure the timing chain tensioner assembly from end to end. If the timing chain tensioner is to be replaced, a new tensioner should be supplied in the fully compressed non-active state. A tensioner in the compressed state will measure 72 mm (2.83 in) (a) from end to end. A tensioner in the active state will measure 85 mm (3.35 in) (a) from end to end.
    3. Fig 2: Timing Chain Tensioner & Compression Tools
    GM2557064Courtesy of GENERAL MOTORS COMPANY
  3. If the timing chain tensioner is not in the compressed state, perform the following steps:
    1. Remove the locking ring from the tensioner body.
    2. Remove the piston assembly from the tensioner body of the timing chain tensioner by pulling it out.
    3. Install the EN-45027-2  tensioner (2) into a vise.
    4. Install the notch end of the piston assembly into the EN-45027-1  tensioner (2).
    5. Using the EN-45027-1  tensioner (1), turn the ratchet cylinder into the piston.
  4. Inspect the bore of the tensioner body for dirt, debris, and damage. If any damage appears, replace the tensioner. Clean dirt or debris out with a lint-free cloth.
  5. Inspect to ensure all dirt and debris is removed from the timing chain tensioner threaded hole in the cylinder head.
    6. Fig 3: Timing Chain Tensioner & Seal Ring
    GM2557050Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  6. Install the timing chain tensioner (1) with a NEW seal ring (2) and tighten to 75 N.m (55 lb ft).
    7. Fig 4: Timing Chain Tensioner Release Tool
    GM2019995Courtesy of GENERAL MOTORS COMPANY
  7. The timing chain tensioner is released by compressing the tensioner 2 mm (0.079 in) which will release the locking mechanism in the ratchet. To release the timing chain tensioner, use a suitable tool with a rubber tip on the end. Feed the tool down through the cam drive chest to rest on the cam chain. Then give a sharp jolt diagonally downwards to release the tensioner.
  8. Install the camshaft cover. Refer to Camshaft Cover Replacement .
  9. Install the dash upper extension panel opening cover. Refer to Dash Upper Extension Panel Opening Cover Replacement .
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