Service manual

2. Improper valve stem (1) to valve guide (2)
clearance may cause excessive oil consumption.
Caution: Refer to Safety Glasses Caution in
Cautions and Notices.
Important: Exhaust valves with excessive valve
stem-to-guide clearance must be replaced with the
available service valve that has an 0.774 mm
(0.0305 in) oversize valve stem. The intake valves are
NOT available with oversize valve stems. Replace
the cylinder head if after using a NEW intake valve in
order to measure the valve stem-to-guide clearance,
the valve stem-to-guide clearance is not within
specifications.
3. Use the J 5830–3 in order to ream the exhaust
valve guide in order to achieve the correct valve
stem-to-guide clearance.
4. Always recondition the exhaust valve seat after
reaming the exhaust valve guide bores and
installing new exhaust valves.
5. Inspect the valves for the following:
• Burnt or damaged areas (1)
• Undersized margin (2)
• Bent stem (3)
• Scoring or other damage to the stem (4)
• Worn key groove (5)
• Worn stem tip (6)
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6-80 Engine Mechanical - 5.0L and 5.7L Engine
2002 - Unit Repair (May 25, 2001)