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INSPECTION
Cylinder head
NOTE:
Do not use a sharp instrument to avoid dam-
aging or scratching:
G
G
4 - 29
CYLINDER HEAD
1. Eliminate:
Carbon deposits (from the combustion
G
chambers)
Use a rounded scraper.
Spark plug threads
Valve seats
2. Inspect:
Cylinder head
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Scratches/damage → Replace.
3. Measure:
Cylinder head warpage
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Out of specification → Resurface.
Cylinder head warpage:
Less than 0.05 mm (0.002 in)
Warpage measurement and resurface-
ment steps:
Place a straightedge and a feeler gauge
G
across the cylinder head.
Use a feeler gauge to measure the
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warpage.
If the warpage is out of specification,
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resurface the cylinder head.
Place a 400 ~ 600 grit wet sandpaper on
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the surface plate, and resurface the head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface rotate the cylin-
der head several times.
ENG
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