Cylinder Head and Gasket Surface Cleaning and Inspection
WARNING: This page is about a different variant/trim than selected.
Remove the spark plugs (1) using EN-39358 socket.
- Inspect the cylinder head gasket and mating surfaces for leaks, corrosion and blow-by. If the gasket has failed, use the following faults to determine the cause:
- Improper installation
- Loose or warped cylinder head
- Missing, off location or not fully seated dowel pins
- Corrosion in the seal area around the coolant passages
- Chips or debris in the cylinder head bolt holes
- Bolt holes in the cylinder block not drilled or tapped deep enough
Inspect the cylinder head gasket surface.
- Cylinder head may be reused if corrosion is found only outside a 4 mm (0.375 in) band around each combustion chamber (1).
- Replace the cylinder head if the area between the valve seats is cracked (2).
- Replace the cylinder head if corrosion has been found inside a 4 mm (0.375 in) band around each combustion chamber (3).
- Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant
- Remove the sealant from the rear cap mating surface with EN-28410 remover. Care must be used to avoid gouging or scraping the sealing surfaces.
- Clean the cylinder head. Remove all varnish, soot and carbon to the bare metal.
- Clean the valve guides.
- Clean the threaded holes. Use a nylon bristle brush.
- Clean the remains of the sealer from the plug holes.
- Inspect the cylinder head for cracks. Check between the valve seats and in the exhaust ports.
- Inspect the cylinder head deck for corrosion, sand inclusions and blow holes.
Using a straight edge (1) and feeler gauge (2), inspect the cylinder head deck surface for flatness. Refer to Engine Mechanical Specifications . If the cylinder head is out of specification, replace the cylinder head. Do not machine the cylinder head.
- Inspect all the threaded holes for damage. Threads may be reconditioned with thread inserts.
- Inspect the sealing surfaces.
Inspect the intake camshaft bearing rear cap (2) for damage.
- Inspect the camshaft bearing caps (1) for damage.
- Inspect the camshaft front upper and lower bearing caps (3, 4) for damage.
- CAUTION:
Refer to Component Fastener Tightening Caution .
Install the spark plugs (1) using EN-39358 socket. Tighten the plugs to 20 N.m (15 lb ft).
NOTE:
Do not use a wire brush on any gasket sealing surface.
NOTE:
Do not attempt to weld the cylinder head, replace it.