Cylinder Head Cleaning and Inspection
- Inspect the cylinder head for the following conditions:
- Damaged sealing surfaces
- Damaged bolt hole threads
- Loose spark plug tubes
- Worn or loose valve seats
- Carbon build-up in the combustion chambers
- Using a straight edge and feeler gage, measure the cylinder head for warpage. Measure along the edges and across the center of the cylinder head.
- If the measurement is less than 0.05 mm (0.002 in), cylinder head resurfacing is not required.
- If the measurement is between 0.05-0.2 mm (0.002-0.008 in), resurface the cylinder head.
- Maximum resurface limit is 0.2 mm (0.008 in) based on a cylinder head height of 121 mm (4.762 in).
- Measure the cylinder head height. Measure from the block surface to the valve cover sealing surface.
Specification:
- Cylinder head height - new: 120.95-121.05 mm (4.762-4.766 in)
- Cylinder head height - service limit: 120.95 mm (4.762 in)
IMPORTANT:
If the camshaft-to-journal clearances are not within specifications, the cylinder head cannot be used again. Refer to Camshafts Cleaning and Inspection .