Section 5 - Maintenance
Page 108
90-8M0053363
eng
NOVEMBER 2010
Dual Water Pick‑up Flush Gearcase Seal Kit
91‑881150K 1
9194
Blocks off the front water inlet holes on the dual water inlet gearcases.
Sterndrive Water Pickups
There are two types of water pickups available on Mercury MerCruiser sterndrives: dual water, and side water pickups. Dual water
pickups require the flushing attachment (44357Q 2) and the flush seal kit (881150K 1), and side water pickups require the flushing
attachment (44357Q 2).
5752
5773
Dual water pickup
Side water pickup
NOTE: Flushing is needed only for salty, brackish, mineral laden or polluted water applications. Flushing is recommended after
each outing for best results.
NOTICE
Flushing the engine with the boat in the water can cause seawater to flow into the engine, resulting in engine damage. Close
the seacock before flushing the engine. Keep the seacock closed until starting the engine.
1. On seawater cooled models: Proceed to Step 4. or Step 5.
2. On models with the sterndrive seawater inlet blocked, supply water to the sterndrive and to the engine. See
Alternative Water
Pickups
.
3. On models using the sterndrive seawater inlet and a through‑hull or through‑transom alternative water pickup, supply water
to only the sterndrive by taking the following steps to block, or disconnect and block, the hose from the alternative seawater
pickup pump inlet Y‑fitting.
a. If equipped with a seacock, close the seacock in the hose from the alternative water pickup.
b. If not equipped with a seacock, disconnect the hose from the alternative water pickup and plug both ends.
c. If there is not a hose running to the transom, refer to
Alternative Water Pickups
.
4. If flushing the cooling system with the boat in the water:
a. Raise sterndrive to trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear housing.
c. Lower sterndrive to full down (in) position.
5. If flushing the cooling system with the boat out of the water:
a. Lower sterndrive to full down (in) position.
