Checking The Cylinder Head - Orion AGB-21G Service Manual

6. Remove:
cylinder head
NOTE:
Loosen the nuts
in the proper sequence.
Loosen each nut 1/2 of a turn at a time.
After all of the nuts are fully loosened, remove
them.

CHECKING THE CYLINDER HEAD

1. Eliminate:
combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
spark plug threads
valve seats
2. Check:
cylinder head
Damage/scratches
3. Measure:
cylinder head warpage
Out of specification
der head.
Cylinder head warpage
Less than 0.03 mm
a. Place a straightedge 1 and a thickness
gauge 2 across the cylinder head.
b. Measure the warpage.
c. If the limited is exceeded, resurface the cylin-
der head as follows.
d. Place a 400
on the surface plate and resurface the cylin-
der head using a figure-eight sanding pat-
tern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
4 - 13
CYLINDER HEAD
Replace.
Resurface the cylin-
600 grit wet abrasive paper