Tools Required

EN 46330  Timing Belt Tensioner Retaining Pin. See Special Tools .

Fig 1: Identifying Timing Belt Tensioner
Courtesy of GENERAL MOTORS CORP.
1. Inspect the tensioner pulley (232) for a grooved or worn belt contact surface or worn bearing.
Fig 2: View Of Timing Belt Pulley & Bolt
Courtesy of GENERAL MOTORS CORP.
2. Inspect the idler pulley (239) for a grooved or worn belt contact surface or worn bearing.
3. Inspect the camshaft and crankshaft sprockets for wear or other damage.
Fig 3: Checking Belt For Damage
Courtesy of GENERAL MOTORS CORP.
4. Inspect the belt for cracking, missing or damaged teeth.
5. Inspect for oil or coolant soaking. Replace the belt if it is oil or coolant soaked. Remove any residual oil or coolant on the belt.
Fig 4: Measuring Dimension Of Tensioner Rod At Full Stroke
Courtesy of GENERAL MOTORS CORP.
6. Remove the EN 46330  from the tensioner (252). See Special Tools . The tensioner rod should move outward from the housing and extend to full stroke.
7. Measure the dimension of the rod at full stroke (a). If the rod extended measures less than or exceeds the specification, replace the tensioner assembly.

   Specification:  Tensioner rod fully extended: 48.8-58.7 mm (1.92-2.31 in)

8. Push on the rod with normal hand pressure. The rod should exert excessive resistance and should not retract easily into the housing. If the rod can be retracted into the housing using normal hand pressure, measure the tensioner spring for proper load.

   Specification: 

   • Tensioner spring load: 151 N (34 lb) at 58.7 mm (2.31 in)
   • Tensioner spring load: 185 N (41.5 lb) at 54.4 mm (2.14 in)
   • Tensioner spring load: 228 N (51 lb) at 48.8 mm (1.92 in)