Mercury MerCruiser 5.7 Horizon, User Manual

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Section 2 - Getting to Know Your Power Package
Page 20 90-899883173 DECEMBER 2007
Identification
The serial numbers are the manufacture's keys to numerous engineering details which
apply to your MerCruiser power package. When contacting MerCruiser about service,
always specify model and serial numbers.
Engine Serial Number Decal
The serial number decal is located on top of the engine.
25902
Serial numbers and maintenance color codes decal
The engine serial number is also stamped in the engine block.
Transmissions
VELVET DRIVE TRANSMISSIONS
On Velvet Drive In‑Line and V‑Drive Transmissions (71C, 72C, 72C V‑Drive, with or without
Walter transmissions) the gear ratio (in forward gear) is marked on transmission
identification plate. Transmission output shaft rotation and propeller rotation required (in
forward gear) is indicated on a decal on transmission case. Transmission rotation is
described when viewed from the rear of transmission.
c
a
b
7424
In‑Line transmission shown (others similarly located)
a - Transmission identification plate
b - Gear ratio (in Forward gear)
c - Output flange rotation decal (in
Forward gear)