Removal
- Remove negative battery cable. Remove interior engine cover (if equipped). Disconnect spark plug wires from spark plugs. Disconnect wiring harness from clips and move wiring harness aside. Remove PCV valve and tube. Remove EGR tube from intake and exhaust manifold. Remove brake booster vacuum hose.
- Remove air cleaner an duct. Remove oil fill tube and oil level indicator tube (if necessary). Remove A/C compressor and lay aside (leave hoses attached). Remove valve covers. Remove rocker arm nuts. If pushrods are to be replaced only, back off valve rocker arm bolts until valve rocker arm can be swung away from pushrod and remove pushrod.
Installation
Coat bearing surfaces with a high viscosity oil with Zinc (1052367). Valve cover gaskets are reusable. Replace gaskets only if damaged. Tighten to specification. See TORQUE SPECIFICATIONS . To install remaining components, reverse removal procedure.
- Remove negative battery cable. Remove interior engine cover (if equipped). Remove upper and lower fan shrouds. Remove engine cooling fan. Remove crankshaft balancer bolt.
- Remove accessory drive belt(s) and water pump pulley. Remove crankshaft pulley bolts and remove pulley from balancer. Using Damper Puller/Installer (J-23523-F), remove crankshaft balancer. Carefully pry seal from front cover.
- Coat the crankshaft front cover oil seal lips with clean engine oil. On 4.3L, 5.0L and 5.7L, install NEW seal in front cover with seal lip facing engine using Seal Installer (J-35468). On 7.4L, install NEW seal in front cover with seal lip facing engine using Seal Installer (J-22102).
- On all models, apply RTV sealant to Woodruff keyway in crankshaft balancer. Using Damper Puller/Installer (J-23523-F), install crankshaft balancer. Tighten all nuts and bolts to specification. See «TORQUE SPECIFICATIONS»(ref-1456-S30447198832000031300000) . To install remaining components, reverse removal procedure.