Mercury Bravo Three - Maintenance and Service

51
CB391
Tune-Up Specifications
AC-MR43T or
Champion RV15YC4 or NGK BR6FS
MODEL
7.4L Bravo Three
Spark Plug Type
.035 in. (.9mm)
Spark Plug Gap
Timing @ Idle RPM
Minimum
450 cca, 575
mca or 90Ah
Firing Order
Recommended
Battery
Rating
10° BTDC
1
1-8-4-3-6-5-7-2
12-Volt Negative (-) GroundElectrical System
55 AmpsAlternator
1
A special procedure must be followed to check or adjust Timing. Consult your
Authorized MerCruiser Dealer before attempting this procedure.