Rocker Arms & Push Rods Buick LeSabre VII

Note. Not all components need to be removed on all models. Remove as necessary for access and clearance.

Removal

1. Disconnect negative battery cable. Remove serpentine belt. To remove left rocker arm cover, remove alternator bracket and spark plug wires. Disconnect torque strut (if equipped) at radiator support. Remove torque strut bracket bolts at manifolds. Remove engine lift bracket.
2. To remove right rocker arm cover, loosen power steering pump bolts, and move pump forward with hoses still attached. Remove power steering pump brackets. Remove spark plug wires.
3. In any case, remove rocker arm cover. Remove rocker arm pivot bolts. Mark rocker arm component locations for reassembly reference. Remove rocker arms and components. (Scheme 7)

Installation

To install, reverse removal procedure. Coat rocker arm bolt threads with GM Threadlock (12345493). Apply thread sealant to rocker arm cover bolt threads.

Scheme 7

Remove intake manifold. See INTAKE MANIFOLD. Remove rocker arms and push rods. See ROCKER ARMS & PUSH RODS. Remove valve lifter guide and valve lifters. (Scheme 7) Mark component locations for reassembly reference.

Coat valve lifters with Engine Oil Supplement (1052365). Install components in original location. To complete installation, reverse removal procedure.

1. Disconnect negative battery cable. Remove engine. See ENGINE. Remove intake manifold. See «INTAKE MANIFOLD»(ref-50089-S40177920952001011600000) . Remove rocker arms and push rods. See «ROCKER ARMS & PUSH RODS»(ref-50089-S22835881492001011600000) .
2. Remove valve lifters. Remove timing chain and sprockets. See «TIMING CHAIN & SPROCKETS»(ref-50089-S09127020242001011600000) . Remove camshaft thrust plate and camshaft. Using Remover/Installer (J-33049), remove camshaft bearings (if necessary).

Inspection

Measure camshaft journal diameter, lobe lift and oil clearance. Replace components if not within specification. See CAMSHAFT table under ENGINE SPECIFICATIONS.

Install camshaft bearings (if removed). Ensure oil holes are aligned. Coat camshaft journals and lobes with GM Lubricant (1052365). Install camshaft. Install components in original locations. Apply Sealant (1052914) to camshaft rear plug. To complete installation, reverse removal procedure. Ensure timing marks are aligned.

1. Disconnect negative battery cable. Remove engine. See «ENGINE»(ref-50089-S23419915002001011600000). Remove the flexplate/flywheel. Remove lower intake manifold. Refer to «INTAKE MANIFOLD»(ref-50089-S40177920952001011600000) (Lower) procedures. Remove the lifter guide. (Scheme 7)
2. Remove front cover. Refer to «FRONT COVER»(ref-50089-S06662082552001011600000). Remove balance shaft gear bolt. (Scheme 8) Remove camshaft sprocket and timing chain. See «TIMING CHAIN & SPROCKETS»(ref-50089-S09127020242001011600000). Remove balance shaft retainer and gear. (Scheme 8) Using Slide Hammer (J-6125-B), remove balance shaft from front of engine.
3. Remove balance shaft plug from rear of cylinder block. Note direction of rear bearing installation. Using Rear Bearing Remover (J-36995-5), remove bearing from block. (Scheme 9)

Note. Balance shaft and bearings are serviced as a complete assembly only. Use specified installation tools to prevent balance shaft damage.

Replace components if damaged or not within specification. See BALANCE SHAFT SPECIFICATIONS table.

1. Lubricate balance shaft bearings with engine oil. Install rear bearing with rolled edge facing inward, toward engine, and manufacturer's marking facing flywheel side of engine. Using Rear Bearing Installer (J-36995-1), install rear bearing. (Scheme 9)
2. Using Balance Shaft Installer (J-36996), install the balance shaft. Temporarily install balance shaft retainer and bolts. Install balance shaft gear. Apply GM Threadlock (12345493) to gear bolt, and install bolt. Tighten gear bolt to specification. Refer to «TORQUE SPECIFICATIONS»(ref-50089-S06927876322001011600000).
3. Install balance shaft rear plug. Using dial indicator, measure balance shaft end play and radial clearance at front and rear of balance shaft. (Scheme 10) Replace components if measurements are not within specification. See «BALANCE SHAFT SPECIFICATIONS»(ref-50089-S41023180052001011600000) table.
4. Rotate camshaft so timing mark is downward when sprocket is installed. With camshaft sprocket and gear removed, rotate balance shaft so timing mark on gear is downward.
5. Rotate balance shaft to align timing marks on camshaft gear and balance shaft gear, and install camshaft gear. see scheme 6 Rotate crankshaft so No. 1 piston is at TDC. Install timing chain and sprocket. Ensure timing marks are aligned. see scheme 6
6. Using a dial indicator, measure the gear lash at 4 places, every 1/4 turn. Gear lash should be within specification. Refer to «BALANCE SHAFT SPECIFICATIONS»(ref-50089-S41023180052001011600000) table.
7. If measurements are within specification, tighten balance shaft retainer bolts to specification. See «TORQUE SPECIFICATIONS»(ref-50089-S06927876322001011600000). To complete installation, reverse removal procedure.

BALANCE SHAFT SPECIFICATIONS

Scheme 8

Scheme 9

Scheme 10