CYLINDER HEAD - CONTINUED
REPAIR/ASSEMBLY - CONTINUED
Do not apply side pressure to ST-685 valve seat grinder motor. This action will cause the
valve seat to be ground off-center.
Steps 32, 33, and 34 are typical for all cylinder head valve seat inserts marked for
32 . Cylinder head (1)
Using ST-685 valve seat grinder and the
correct arbor from ST-663 valve guide
arbor set, grind valve seat inserts to
Check seat width. It should be no
smaller than dimension A and no larger
than dimension B.
If seat width is wider than dimension
B, material can be removed from
points (3) and (4) with specially
dressed grind stones. Narrowing
should not extend beyond chamfer on
valve seat insert. Chamfer provides
metal for staking insert Into cylinder
Using eccentricimeter (5), check valve
seat insert runout. Total runout should not
exceed 0.002 inch (0.05 mm).
if runout exceeds this measurement,
repeat step 32.
Remove all tools from valve seat insert.
Clean cylinder head. See General
Maintenance Instructions, page 2-3.