Cleaning and Inspection Procedure - Conditional
NOTE:
Perform the following cleaning and inspection or overhaul steps, as necessary. ONLY perform steps when components are removed with the intention of reinstallation.
Clean the exhaust manifold (1) and heat shield (2) in solvent.
- Dry the exhaust manifold (1) with compressed air.
- Inspect the exhaust manifold (1) to the cylinder head exhaust manifold gasket surface for excessive scratches or gouging.
- Inspect for a loose, damaged, or cracked heat shield (2).
- Inspect the heat shield bolts (3) for damaged threads.
Use a straight edge (1) and a feeler gauge and measure the exhaust manifold cylinder head deck for warpage.
An exhaust manifold cylinder head deck with warpage in excess of 0.25 mm (0.01 in) within the 2 front or 2 rear runners or 0.5 mm (0.02 in) overall, may cause an exhaust leak. Exhaust manifolds not within specifications MUST be replaced.
- Inspection the spark plug wire for the following conditions:
- Correct routing of the spark plug wires. Incorrect routing may cause cross-firing.
- Inspect for any signs of cracks or splits in the wires.
- Inspect each boot for the following conditions:
- Tearing
- Piercing
- Arcing
- Carbon tracking
- Corroded terminals
- If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or on a terminal, replace the wire and the component connected to the wire.
NOTE:
Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation.