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Home >> Buick >> 1989 >> Electra Estate Wagon >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 3.8L "3800" V6 - VIN [C] >> Removal & Installation >> Balance Shaft >> Installation

Balance Shaft: Installation

  1. Lubricate balance shaft bearings with engine oil. Rear bearing must be installed with rolled edge facing inward toward the engine and manufacturer's marking facing flywheel side of engine. Using Rear Bearing Installer (J-36995-1), install rear bearing.
    CAUTION: Balance shaft rear bearing must be installed with rolled edge facing inward toward the engine and manufacturer's marking facing flywheel side of engine.
  2. Using Balance Shaft Installer (J-36996), install balance shaft. Temporarily install balance shaft retainer and bolts. Install balance shaft gear. Apply thread sealant to gear retaining bolt and install. Tighten gear retaining bolt to specification. See TORQUE SPECIFICATIONS  table at end of article.
  3. Install balance shaft rear plug. Using dial indicator, measure balance shaft end play and radial clearance at front and rear of balance shaft. See Fig 1. Replace components if not within specification. See BALANCE SHAFT SPECIFICATIONS table.
    Fig 1: Measuring Balance Shaft Clearances
    G109516Courtesy of GENERAL MOTORS CORP.
  4. Rotate camshaft so when sprocket is installed, timing mark is downward. With camshaft sprocket and gear removed, rotate balance shaft so that timing mark on gear is downward.
  5. Align timing marks on camshaft gear and balance shaft gear by rotating balance shaft and install camshaft gear. See Figure. Rotate crankshaft so No. 1 piston is at TDC. Install timing chain and sprocket. Ensure timing marks are aligned. See Figure.
  6. Using dial indicator, measure gear lash at four places. Gear lash should be within specification. See BALANCE SHAFT SPECIFICATIONS table. If all measurements are within specification, tighten balance shaft retainer bolts to specification. To install remaining components, reverse removal procedure.
BALANCE SHAFT SPECIFICATIONS

Application In. (mm)
Bearing Bore I.D.
Front 2.0462-2.0472 (51.973-51.999)
Rear 1.950-1.952 (49.530-49.581)
End Play 0-.008 (0-.20)
Gear Lash .002-.005 (.05-.13)
Radial Clearance
Front 0-.0011 (0-.028)
Rear .0005-.0047 (.013-.119)
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