Battery Cables Connection
IMPORTANT: Engine electrical system is negative (–) ground.
1. Connect engine positive (+) battery cable (usually red) to positive (+) battery terminal.
2. Connect engine negative (–) battery cable (usually black) to negative (–) battery terminal.
3.
Install the power harness. Refer to Section 7 ‑ Power Harness.
4. Secure the battery cables and the power harness leads to the battery with hex nuts. Tighten the hex nuts to the specified
torque.
Description Nm lb‑in. lb‑ft
Hex nut 13.5 120 –
5. Spray battery terminals with a battery connection sealant to help prevent corrosion.
Shaft Log Seal Connection
NOTICE
Incorrectly installing the water supply hose to the shaft log seal can cause increased exhaust system corrosion or submersion
or freeze damage due to siphoning. Position and securely fasten the water supply hose with a portion of the hose above the
engine exhaust elbows.
The propeller shaft log seal hose should be routed so that a portion of the hose extends above the top of the engine exhaust
elbows to prevent a siphoning action when the engine is not running. The hose must be securely fastened to keep it properly
positioned.
A plug is installed at the factory into the proper port on the poppet valve hose assembly.
a - Shaft log seal plug
IMPORTANT: If not using a shaft log seal, this plug must remain installed.
1. Remove the plug from the poppet valve hose assembly.
2. Install the reducer fitting shipped with the parts bag.
3. Attach the shaft log seal cooling water hose to the reducer fitting.
4. Route the propeller shaft log seal hose so that a portion of the hose extends above the top of the engine exhaust elbows.
5. Fasten the hose securely to keep it properly positioned.
Propeller Selection
IMPORTANT: The installed propeller must allow the engine to run at its specified maximum WOT RPM. Use an accurate
service tachometer to verify engine operating RPM.
It is the responsibility of the boat manufacturer or the selling dealer to equip the power package with the correct propeller.
Specified engine WOT and operating RPM range are listed in the Mercury MerCruiser Operation, Maintenance and
Warranty Manual attached to the engine.
Select a propeller that will allow the engine power package to operate at or near the top end of the recommended WOT
operating RPM range with a normal load.
If full throttle operation is below the recommended range, the propeller must be changed to prevent loss of performance and
possible engine damage. On the other hand, operating an engine above the recommended operating RPM range will cause
higher than normal wear or damage.
After initial propeller selection, the following common problems may require that the propeller be changed to a lower pitch.
Installation
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 2B-47
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