Draining Instructions - Mercury D4.2L Manual

CD665
Power Package Layup (Continued)
Drain seawater section of cooling system and prepare for cold weather or extended storage following these pro-
cedures:

DRAINING INSTRUCTIONS

If boat is to remain in the water, seacock, if so equipped, must remain closed until engine is to be re-
started to prevent water from flowing back into seawater cooling system. If boat is not fitted with a sea-
cock, water inlet hose must be disconnected and plugged to prevent water from flowing into cooling
system and/or boat. As a precautionary measure, attach a tag to the ignition switch or steering wheel
with the warning that the seacock must be opened or the water inlet hose reconnected prior to starting
the engine.
IMPORTANT: Observe the following information to ensure complete draining of cooling system:
•
Engine must be as level as possible.
•
A wire should be repeatedly inserted into all drain holes to ensure there are no obstructions in pas-
sages.
1
Close seacock, if so equipped, or disconnect and plug seawater inlet hose, if boat is to remain in the water.
2
Remove the end covers (A and B) from BOTH port and starboard ends of upper and lower sections of heat
exchanger tank. Drain tank completely. Sponge-out or soak-up any water that remains in the bottom part of each
section, until all water passage tubes are completely free of standing water.
Avoid damage to heat exchanger and subsequent possible engine damage. Remove all water from
heat exchanger sections. Failure to do so could cause corrosion or freeze damage to heat exchanger
water passage tubes.
NOTE: In the following it may be necessary to lower or bend the hoses to allow water to drain completely.
3
Disconnect seawater outlet hose at aft end of power steering cooler. Lower hose and drain completely.
4
Remove the drain plug from the aft end cover of the intercooler.
NOTE: D4.2L engine intercooler drain plug shown, all models similar.
5
Remove seawater pump outlet hose from top of seawater pump and drain.
6
Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system is drained.
Avoid water entering boat. Do not unplug seawater inlet hose unless a seacock is present and it is
closed.
7
Remove hose(s) at seawater strainer and drain hose(s) completely. Empty seawater strainer. (refer to "Clean-
ing Quicksilver Seawater Strainer") Reconnect hose(s) and tighten hose clamps securely.
8
Make sure that speedometer pitot tube, trim tab cavity vent hole, and trim tab cavity drain passage are unob-
structed and open.
9
After seawater section of cooling system has been drained completely, coat threads of intercooler drain plug
with Perfect Seal and reinstall. Tighten securely. Reconnect hoses. Tighten hose clamps securely. Install and
torque the end covers (B) on the upper heat exchanger section to 120-132 lb-in. (14-15 Nm). Torque the end
covers (A) on the lower heat exchanger section to 108-120 lb-in. (12-14 Nm).
CAUTION
CAUTION
CAUTION
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