Flushing Device 91‑44357Q 2
Attaches to the water intakes; provides a fresh water connection when flushing the cooling system or
operating the engine.
Dual Water Pick‑up Flush Gearcase Seal Kit 91‑881150K 1
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 only required after operation in salty, brackish, mineral‑laden, or polluted water. Flushing is required after
each outing for best results.
1. On models with the sterndrive seawater inlet blocked, supply water to the sterndrive and to the engine. Refer to
Alternative Water Pickups.
2. On models using the sterndrive seawater inlet and a through‑the‑hull or through‑the‑transom alternative water pickup,
supply water only to the sterndrive by taking the following steps to block off, or disconnect and plug the hose from the
alternative seawater pickup pump inlet Y‑fitting.
a. If equipped with a seacock, close the seacock on 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.
3. On models using the sterndrive water pickups for water supply: proceed to Step 4 or Step 5.
4. If flushing the cooling system with the boat in the water:
a. Raise the sterndrive to the trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear housing.
c. Lower the sterndrive to the full down (in) position.
Section 4 - Maintenance
90-8M0128973 eng MAY 2017 Page 83
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