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Mercury 305 CID - Page 223

Mercury 305 CID
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ENGINES - 3A-3190-823225--1 1096
2. Install air line adaptor tool (J-23590) in spark plug
hole and apply compressed air to hold valves in
place.
NOTE: If compressed air is not available, piston may
be brought up to TDC and used to keep valves from
falling out of valve guides.
IMPORTANT: Do not turn crankshaft while valve
springs, retainers, and locks are removed or
valves will fall into cylinder.
3. Using valve spring compressor as shown, com-
press valve spring and remove valve locks.
72306
a - Valve Spring Compressor (J-5892)
b - Rocker Arm Nut
b
a
4. Slowly release valve spring compressor. Re-
move cap, shield, and valve spring.
IMPORTANT: Keep air pressure in cylinder while
springs, caps, and valve locks are removed or
valves will fall into cylinder.
5. Remove seals from valve stems and valve guide.
72330
a
a - Valve Guide Seal

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