General Information
Repair Guidelines
• Follow all warning, cautions, and notices contained in this manual.
• Disconnect the battery prior to performing any repair procedures.
• Boat design factors and the nature of particular repairs may require that the engine be removed from the boat. Place the
engine on a repair stand for major repairs.
• Lubricate all moving parts during assembly with clean engine oil or as specified. Apply appropriate lubricant, sealant, or
adhesive to all fasteners as specified.
IMPORTANT: To facilitate service or repair, some external components that are not mentioned in this section's procedural
steps must be removed. Refer to the appropriate sections of this manual for service information concerning any external
component that interferes with engine service or repair.
Engine Rotation
Engine rotation is observed from the rear of the engine (transmission or sterndrive end) looking forward (water pump end).
Engine rotation is not necessarily the same as propeller rotation.
IMPORTANT: All engines covered by this service manual are left‑hand (LH) rotation.
12710
Left-hand rotation (counterclockwise)
Crankcase Oil Dipstick Measurements
IMPORTANT: Crankcase dipsticks from different applications are not interchangeable.
IMPORTANT: Do not overfill engine crankcase with oil. Fill to the operating range only.
1. Stop the engine. Allow approximately five minutes for the oil to drain into the oil pan. The boat must be at rest in the water.
a - Oil dipstick handle
b - Operating range
2. Remove the dipstick. Wipe clean and insert fully into the dipstick tube. Wait 60 seconds to allow trapped air to vent.
Engine Disassembly
Page 3A-6 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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