ENG
R-87
INSPECTION AND REPAIR
INSPECTION AND REPAIR:
CYLINDER HEAD
4-15
CYLINDER HEAD
1. Remove :
• Carbon deposits from combustion
chambers using a rounded scraper.
NOTE :
Do not use a sharp instrument to avoid dam-
aging or scratching :
• Spark Plug threads
• Valve seats
2. Inspect :
• Cylinder Head
Scratches/damage Ÿ Replace
3. Measure :
• Cylinder Head warpage
Out of specification Ÿ resurface/ replace.
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Warpage measurement and resurfacement
steps:
• Place a straightedge ¿ and a feeler gauge À
across the Cylinder Head.
• Measure the warpage.
• If the warpage is out of specification, resur-
face the Cylinder Head/replace if necessary.
• Place a 400 ~ 600 grit wet abrasive paper on
the surface plate, and resurface the Head
using a figure-eight sanding pattern.
NOTE :
Rotate the Cylinder Head several times for an
even resurfacement.
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Cylinder Head warpage :
Less than 0.03 mm
