Balance Shaft Installation

WARNING: This page is about a different variant/trim than selected.

Tools Required

Fig 1: Installing Balance Shaft

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Use J 21465-13 and J 36996 to install the balance shaft into the engine block. See Special Tools .

Fig 2: View Of Balance Shaft Retainer

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NOTE: Refer to FASTENER NOTICE .

Install the balance shaft retainer bolts.
Tighten: Tighten the balance shaft retainer bolts to 30 N.m (22 lb ft).

Fig 3: Locating Balance Shaft Driven Gear & Bolt

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NOTE: Refer to Special Fastener Notice .

Install the balance shaft driven gear bolt.
Tighten: Tighten the balance shaft driven gear bolt to 22 N.m (16 lb ft). Use J 45059 to tighten the bolt an additional 70 degrees.

Fig 4: Measuring Balance Shaft End Play

Courtesy of GENERAL MOTORS CORP.

Using J 8001 measure the balance shaft end play. See Special Tools . End play must not exceed 0.028 mm (0.008 in).

Fig 5: Measuring Balance Shaft Radial Play

Courtesy of GENERAL MOTORS CORP.

Using J 8001 measure the balance shaft radial play at the rear. See Special Tools . Radial play must be between 0.0127-0.119 mm (0.0005-0.0047 in).
Install the balance shaft drive gear.
Install the camshaft sprocket.
Turn the camshaft so the timing mark on the camshaft sprocket is straight down.
Remove the camshaft sprocket and balance shaft drive gear.
Turn the balance shaft so the timing mark on the balance shaft driven gear points straight down.
Partially install the balance shaft drive gear so the gear teeth are not engaged.
Align the marks on the balance shaft driven gear and the balance shaft drive gear. Do this by turning the balance shaft.
Once marks are aligned, fully seat balance shaft drive gear and engage gear teeth.
Turn the crankshaft so the number one piston is at top dead center.
Install the timing chain and camshaft sprocket.

Fig 6: Measuring Balance Shaft Gear Lash

Courtesy of GENERAL MOTORS CORP.

Using J 8001 measure the gear lash at four places. See Special Tools . Measure every quarter turn. Gear lash must be between 0.050-0.127 mm (0.002-0.005 in).