Scheduled Maintenance - Mercury 2.8 Diesel Operation & Maintenance Manual

Section 4 - Maintenance
Task Interval
Every two months

Scheduled Maintenance

Task Interval
Annually
Every 100 hours or
annually
(whichever occurs first)
Every 200 hours or
annually
(whichever occurs first)
Every 2 years
Every 700 hours or 3
years (whichever occurs
first)
Every 1000 hours or 5
years (whichever occurs
first)
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• Check the battery connections and fluid level.
• Lubricate the propeller shaft and tighten the propeller nut to the specified torque. If operating
in only freshwater, this maintenance may be extended to every four months.
• Treat the engine surfaces with Corrosion Guard if operating in saltwater, brackish, or polluted
waters.
• Inspect the air filter every two months or every 50 hours, whichever occurs first.
• Inspect the engine anodes and replace if 50% or more eroded.
• Ensure that the gauges and the wiring connections are secure. Clean the gauges every two
months or every 50 hours, whichever occurs first. If operating in saltwater, the interval is
reduced to every 25 hours or 30 days whichever occurs first.
• Touch up the power package with paint and spray with Corrosion Guard.
• Change the sterndrive gear lube.
• Torque the gimbal ring U‑bolt locknuts.
• Check the steering system and the remote control for loose, missing, or damaged parts.
Lubricate the cables and linkages.
• Inspect and lubricate the sterndrive U‑joint splines. Inspect the bellows, the exhaust tube, and
check the clamps.
• Lubricate the engine coupler (lubricate the engine coupler every 50 hours if operated at idle
for prolonged periods of time).
• Check the continuity circuit for loose or damaged connections. If the boat is equipped with a
MerCathode system, test the unit's output.
• Check the engine alignment.
• Torque the engine mounts.
• Check the electrical system for loose, damaged, or corroded terminals.
• On driveshaft extension models, lubricate the driveshaft U‑joints, transom end (tailstock)
bearings, and engine end (output) bearings.
• Inspect the cooling system and the exhaust system for damage or leaks. Check both systems
hose clamps for tightness.
• Change the engine oil and filter.
• Replace the fuel filters.
• Replace the air filter.
• Inspect the condition and tension of the engine accessory drive belts.
• Disassemble and inspect the engine seawater pump and replace worn components.
• Check the seawater pump drive belt.
• Clean the seawater section of the closed‑cooling system. Clean, inspect, and test the
pressure cap. Check the anodes and replace if eroded by 50% or more.
• Check the closed‑cooling fluid level and level of protection.
• Clean the seawater strainer.
• Check the run history for faults.
• Check the engine timing belt.
• Replace the engine coolant.
• Replace the power‑assisted steering pump drive belt.
• Replace the engine timing belt.
• Clean the fuel tank.
• Clean the aftercooler core.
Maintenance to Be Performed
Maintenance to Be Performed
90-8M0113987 DECEMBER 2015
eng