Mercury 520 Bravo Sterndrive - Engine Hard to Start, Runs Rough, Misses, And;Or Backfires; Low Engine Coolant (Closed Cooling) Temperature

6. Pump air into the system until both green indicators extend and water
drains from both sides of the engine. The port side will begin draining
before the starboard side.
a - Manual release valve
b - Air pump lever
(locked)
c - Air pump
d - Air connection
e - Green indicators
extended
a
b
c
d
e
50409
COLD WEATHER OR EXTENDED STORAGE
96 eng