Explorer Patriot 430, Service Manual

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Remove valve stem seals.
Clean carbon deposits in combustion chamber.
Clean residues and foreign materials on cylinder
head matching surface.
Caution
Do not damage the matching surface of
cylinder head.
5. Cylinder Head Inspection
Check if spark plug and valve holes are cracked.
Measure cylinder head warp with a straightedge
and thickness gauge.
Service limit: 0.05 mm
Camshaft
Inspect cam lobe height for damaged.
Service Limit:
IN: Replacement when less than 33.392mm
EX: Replacement when less than 33.277mm
Inspect the camshaft bearing for looseness or
wear out. If any damage, replace whole set of
camshaft and bearing.
Valve stem
seals