Yamaha Scorpio, Руководство по обслуживанию

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4 - 12
ENG
CYLINDER HEAD
12.Remove:
●
Dowel pins
1
●
Gasket (cylinder head)
2
●
Timing chain guide (exhaust side)
3
CYLINDER HEAD INSPECTION
1.Eliminate:
●
Carbon deposits
(from combustion chambers)
Use a rounded scraper.
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
●
Spark plug threads
●
Valve seats
2.Inspect:
●
Cylinder head
Scratches/damage
→
Replace.
3.Measure:
●
Cylinder head warpage
Out of specification
→
Resurface.
***********************************************
Warpage measurement and resurfacement
steps:
●
Place a straightedge and feeler gauge
across the cylinder head.
●
Measure the warpage.
●
If the warpage is out of specification, resur-
face the cylinder head.
●
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.
***********************************************
Cylinder head warpage:
Less than 0.03 mm