2. Use a 6‑mm Allen wrench to remove the fluid filter assembly by turning the assembly nut counterclockwise and pulling at
the same time.
a - Fluid filter assembly
b - Assembly nut
3.
On 63A transmissions:
a. Push the hose of a suction pump through the suction pipe and down to the bottom of the housing.
b. Pump the fluid from the housing into a suitable container. Dispose of the fluid according to local regulations.
a - Suction pipe
b - Suction pump
4.
On 63IV transmissions:
a. Remove the drain plug from the transmission and allow the fluid to drain.
Typical 63IV transmission
a - Drain plug
b. Install and securely tighten the drain plug after the transmission is drained.
5. Check the fluid for:
•
Metal particles: A few small particles are normal. Larger metal chips are an early sign of transmission failure, which
may mean the transmission should be disassembled and inspected for internal damage.
•
Rubber particles: Indication of cooler hose wear. The hoses should be inspected for cracks or fraying. Replace the
damaged hoses.
6. Remove and discard the filter element and O‑rings.
7. Coat the new O‑rings with new transmission fluid.
Tube Ref No.
Description Where Used Part No.
28
Dexron III Automatic Filter element O-rings Obtain Locally
b
a
13163
a
b
13165
8654
a
ZF/45C, 45IV, 63A, 65IV Transmissions
Page 9A-12 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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