46. Cylinder Head Clean and Inspect

Cylinder Head Cleaning and Inspection

1. 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





2. Important: If the camshaft-to-journal clearances are not within specifications, the cylinder head cannot be used again.

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 inch), cylinder head resurfacing is not required.
^ If the measurement is between 0.05 - 0.2 mm (0.002 - 0.008 inch), resurface the cylinder head.
^ Maximum resurface limit is 0.2 mm (0.008 inch) based on a cylinder head height of 121 mm (4.762 inch).
3. Measure the cylinder head height. Measure from the block surface to the valve cover sealing surface.
^ Cylinder head height - new: 120.95 - 121.05 mm (4.762 - 4.766 inch)
^ Cylinder head height - service limit: 120.95 mm (4.762 inch)