CYLINDER ASSEMBLY REPAIR
8. Inspect valve seat inserts (20, 21) for cracks, pitted surfaces, or looseness.
If valve seats are cracked, loose, or damaged beyond repair, the
cylinder must be replaced.
9. Lightly blue face of two valve seats (20, 21) with Prussian blue (item 25, WP 0173), and place
a new valve (6, 11) into position on valve seat.
10. Rotate valves (6, 11) one-half turn on insert and check for Prussian blue contact. Valve seats
(20, 21) must show contact all around (360 degrees), as indicated by Prussian blue transfer, to
qualify as serviceable. Valve seats that do not show 360-degree contact must be marked for
WP 0135 00-10