REMOVE SCR VALVES.
Remove plugs (53).
Remove preformed packings (54) from plugs.
Discard preformed packings.
SCR valve is factory set and must not be
altered in any way. Do not disassemble
valve, alter shims, or interchange parts
with another valve. Erratic operation of
altering or interchanging valve parts.
Remove springs (55) and SCR valves (56).
REMOVE SPRING SEAT.
Remove plug (57).
Remove preformed packing (58) from plug.
Discard preformed packing.
Remove shim (59), spring (60), and spring seat
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