63A Dts; Important Information; Engine; Propeller - Mercury MerCruiser Service Manual

ZF/45C, 45IV, 63A, 65IV Transmissions

63A DTS

Important Information

Engine

All current production engines are left‑hand rotation. Engine rotation is described as observed from the rear of the engine
(transmission end) looking forward (water pump end). The installed angle of the transmission and the engine should not exceed
12° of the waterline.

Propeller

Propeller rotation is described as observed from the stern looking forward. The term left‑hand (LH) refers to counterclockwise
rotation. The term right‑hand (RH) refers to clockwise rotation. A LH propeller will move the boat forward when rotated
counterclockwise. A RH propeller will move the boat forward when rotated clockwise.

Precautions

The transmission gear ratio is marked on the transmission identification plate, which is located on the top of the transmission.
Transmission rotation is described as viewed from the rear of transmission.
• Do not start or crank the engine without fluid in the transmission.
• Except in an emergency, never shift the transmission at engine speeds above 1000 RPM.
• Freewheeling of one propeller (in a twin engine boat) at trolling speeds will not cause damage to the transmission.
However, freewheeling should be avoided above trolling speed. Ensure that the transmission fluid is at the proper level
before freewheeling the propeller.
• Always replace the fluid cooler and hoses after a transmission failure or prior to installing a new or rebuilt transmission.
Metallic particles from a failure tend to collect in the cooler and hoses and will gradually flow back into the fluid system and
damage the transmission.
• Always use the specified fluid cooler, hoses, and fittings.
45C and 63 In‑Line Transmissions

Transmission and Propeller Rotation

On MIE engines equipped with in‑line transmissions having 1:1 gear ratio, the transmission output shaft rotation is the same as
the engine rotation with the transmission in forward gear. Engine rotation is LH (CCW), so a LH propeller is required.
NOTE: 45C transmissions are not full power reversing.
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63A DTS
© 2016 Mercury Marine
59769
90-8M0099748 eng DECEMBER 2015