MerCruiser 8.1 H.O., User Manual

Page: 69 / 106

Section 5 - Maintenance
90-899883273 MARCH 2008 Page 61
Task Interval Maintenance to Be Performed
Every 300 hours or 3
years
(whichever occurs first)
• Check the engine mounts for tightness and tighten to specifications if
necessary.
• Inspect the condition of the spark plugs, spark plug wires, and the distributor
cap and rotor, if equipped. Replace as necessary. If the condition of these
components is satisfactory at inspection, repeat inspection every 100 hours
or once a year, whichever occurs first.
• Check the electrical system for loose, damaged, or corroded fasteners.
• Check the cooling system and the exhaust system hose clamps for tightness.
Inspect both systems for damage or leaks.
• Disassemble and inspect the seawater pump and replace worn components.
• Clean the seawater section of the closed‑cooling system. Clean, inspect,
and test the pressure cap.
• Inspect the exhaust system components. If the package was equipped with
water shutters (flapper valves), verify that they are not missing or worn.
Every 5 years
• Replace the coolant/anitifreeze. Replace every two years if not using
extended‑life coolant/antifreeze.
Maintenance Log
Record all maintenance performed on your power package here. Be sure to save all work
orders and receipts.
Date Maintenance Performed Engine Hours