Section 4 - Maintenance
Page 56 90-8M0113857 eng DECEMBER 2015
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 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 models with the sterndrive seawater inlet blocked, supply water to the sterndrive and to the engine. See 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 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.
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