Mercury MerCruiser MCM 454 Mag MPI Service Manual page 919

VELVET DRIVE IN-LINE TRANSMISSION
Engine
Engine rotation is indicated on engine specifications and serial number decal on flame
arrestor cover. Engine rotation is described when observed from the rear of the engine
(transmission end) looking forward (water pump end).
Installed angle of MIE inboard transmission and engine should not exceed a maximum of
18 of the water line.
Transmission
Transmission gear ratio (in forward gear) is marked on transmission identification plate,
which is located on the port (left) side of transmission. Transmission output shaft rotation
and propeller rotation required is indicated on a decal on transmission case. Transmission
rotation is described when viewed from the rear of transmission with transmission in forward
gear selector position.
On MIE engines equipped with in-line transmissions having 1:1 gear ratio, transmission out-
put shaft rotation is the same as engine rotation with transmission in forward gear. Engine
rotation is LH (CCW), so a LH propeller is required.
1. DO NOT start or crank engine without fluid in transmission.
2. Use only recommended fluid in transmission.
3. Except in an emergency, never shift transmission at engine speeds above 1000 RPM.
4. Free wheeling of one propeller (in a twin engine boat), at trolling speeds, will not cause
damage to the transmission; however, boat operation above trolling speed should be
avoided. Be sure proper fluid level exists before free wheeling propeller.
5. DO NOT paint shift lever poppet ball and spring. An accumulation of paint here will
prevent proper action of the detent.
6. Always replace oil 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 transmission.
7. Always use specified oil cooler, hoses and fittings. Hoses must be at least 13/32 in. (10.5
mm) I.D. Oil cooler, hoses and fittings must be sufficient size to maintain transmission
fluid (in sump) at 140-190 F (60-88 C).
Propeller
Propeller rotation is described when observed from the rear of the boat (stern) looking for-
ward (bow end). The term "left-hand" (LH) refers to rotation in the counterclockwise (CCW)
direction. The term "right-hand" (RH) refers to rotation in the clockwise (CW) direction. A LH
propeller will move the boat forward when rotated counterclockwise. A RH propeller will
move the boat forward when rotated clockwise. Propeller rotation is not necessarily the
same as engine rotation.
Index
Page 8A-4
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SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999