Tighten • Balance shaft driven gear bolt to 20 N m (15 lb. ft.) plus an additional turn of 35° using J 36660. IMPORTANT: Rotate balance shaft by hand to make sure there is clearance between the balance shaft and retainer. If balance shaft does not rotate freely, check to be sure retaining ring on front bearing is seated on case. Turn the camshaft so, with the balance shaft drive gear temporarily installed, the timing mark on the drive gear is straight up. With the balance shaft drive gear removed, turn the balance shaft so the timing mark on the driven gear points straight down. 5 . Balance shaft drive gear onto camshaft. IMPORTANT:
Make sure the timing marks on the balance shaft drive gear and driven gear line up (figure 12-76). 6 . Balance shaft drive gear bolt. Tighten • Bolt to 16 N m (12 lb. ft.). Figure 12-76 Balance Shaft Drive Gear-to- Driven Gear Timing Marks Camshaft Installation Figure 12-77 Install or Connect IMPORTANT: Coat camshaft lobes and journals with Engine Oil Supplement (GM P/N 1052367) or equivalent. Apply Engine Oil Supplement (GM P/N 1052367) or equivalent, to all the teeth on the distributor drive gear. 1 . Install three 5/16 x 18 bolts 100 - 125 mm (4 - 5 in.) long into the camshaft threaded holes. Use these bolts to handle the camshaft. 2 . Camshaft to the engine (figure 12-77).
Handle the camshaft carefully to prevent damage to the camshaft bearings. NOTICE : Refer to “Notice” on page 1. 3 . Camshaft retainer and retainer bolts. Coat camshaft retainer plate with Engine Oil Supplement (GM P/N 1052367) or equivalent. Tighten • Bolts to 14 N m (124 lb. in.). Figure 12-75 Installing Balance Shaft G643 (E) Service Manual Chapter 3. Engine Mechanical System 99