Balance Shaft Drive Chain and Tensioner Install

Important:  If the balance shafts are not properly timed to the engine, the engine may vibrate and make noise.

1. Install the upper balance shaft chain guide.

   Tighten 

   Tighten the upper balance shaft chain guide bolts to 10 N.m (89 lb in).

   Fig 1: Installing Upper Balance Shaft Chain Guide

   Courtesy of GENERAL MOTORS CORP.
2. Install the small balance shaft chain guide.
3. Tighten the balance shaft chain guide bolts.

   Tighten 

   Tighten the chain guide bolts to 10 N.m (89 lb in).

   Fig 2: Installing Small Balance Shaft Chain Guide

   Courtesy of GENERAL MOTORS CORP.
4. Install the adjustable balance shaft drive chain guide.

   Tighten 

   Tighten the chain guide bolts to 10 N.m (89 lb in).

   Fig 3: Installing Adjustable Balance Shaft Drive Chain Guide

   Courtesy of GENERAL MOTORS CORP.
5. Reset the timing chain tensioner by performing the following steps:
   1. Turn the tensioner plunger 90 degrees in its bore and compress the plunger.
   2. Turn the tensioner back to the original 12 o'clock position and insert a paper clip through the hole in the plunger body and into the hole in the tensioner plunger.
6. Install the timing chain tensioner.
7. Tighten the chain tensioner bolts.

   Tighten 

   Tighten the chain tensioner bolts to 10 N.m (89 lb in).

8. Remove the paper clip from the balance shaft drive chain tensioner.
   Fig 4: Installing Timing Chain Tensioner

   Courtesy of GENERAL MOTORS CORP.