Disconnect negative battery cable. Remove right-side fuel rail cover, if equipped. Remove crankcase vent hose. Remove air injection pipe (with check valve) from exhaust manifold, if equipped. Disconnect ignition coil harness main connector. Remove spark plug wires from ignition coils. Remove valve cover bolts, valve cover and gasket.
Installation
To install, reverse removal procedure. Tighten bolts and nuts to specification. See TORQUE SPECIFICATIONS .
Remove valve covers. See VALVE COVERS . Mark components for installation into original locations. Remove rocker arm bolts, rocker arms, rocker arm pivot support and push rods.
- Lubricate rocker arms and pushrods with clean engine oil. Lubricate flange of rocker arm bolt and any contacting surfaces. Install rocker arm pivot support. Install pushrods, making sure they seat properly into lifter sockets. Install rocker arms and bolts. DO NOT fully tighten bolts at this time. CAUTION: Rocker arm bolts must be tightened to specification with appropriate piston at TDC of compression stroke to avoid damage to valve train.
- Rotate crankshaft so No. 1 piston is at TDC of compression stroke. Tighten rocker arms in order listed. See «ROCKER ARM TIGHTENING SEQUENCE»(ref-97422-S12466979282001050700000) table. Tighten to specification. See «TORQUE SPECIFICATIONS»(ref-97422-S40653072052001050700000) .
- Rotate crankshaft so No. 6 piston is at TDC of compression stroke. Tighten appropriate rocker arms. To complete installation, reverse removal procedure. Tighten bolts and nuts to specification. See «TORQUE SPECIFICATIONS»(ref-97422-S40653072052001050700000) .
| Application | Cylinders No. | |
|---|---|---|
| Cylinder No. 1 (1) | ||
| Exhaust | 1, 2, 7 & 8 | |
| Intake | 1, 3, 4 & 5 | |
| Cylinder No. 6 (1) | ||
| Exhaust | 3, 4, 5 & 6 | |
| Intake | 2, 6, 7 & 8 | |
| (1) Piston at TDC of compression stroke. | ||
| (1) | Piston at TDC of compression stroke. |
ROCKER ARM TIGHTENING SEQUENCE
Note. Some valve lifters may be stuck in their bores due to gum or varnish deposits. Use Valve Lifter Remover (J 3049-A) to remove valve lifter.
Disconnect negative battery cable. Remove intake manifolds. See INTAKE MANIFOLD . Remove exhaust manifolds. See EXHAUST MANIFOLD Remove valve covers. See VALVE COVERS . Remove rocker arms and push rods. See ROCKER ARMS & PUSH RODS . Remove cylinder heads. See CYLINDER HEADS . Remove valve lifter guide bolts, and remove valve lifters and guide. Note location of each lifter and lifter guide for reassembly.
Inspection
Note. If sides of lifter are worn, inspect lifter bores for wear or damage.
Thoroughly clean lifters in cleaning solvent, and dry with compressed air. Inspect lifters for bent or broken clips, worn push rod sockets, worn sides, flat spots on roller, loose or damaged pin, plugged oil hole and damaged roller bearings. Inspect valve lifter guides for damage or excessive wear in lifter mounting bores.
Lubricate lifters and cylinder block lifter bores with engine oil. Insert lifters into lifter guides, aligning flat area on top of lifter with flat area in lifter guide. Push lifter completely into lifter guide bore. Install valve lifter and guide assembly into original location in cylinder block, and install lifter guide bolt. To complete installation, reverse removal procedure. Tighten bolts to specification. See TORQUE SPECIFICATIONS .