Scheduled Maintenance - Mercury 4.2 Diesel Operation & Maintenance Manual

Section 4 - Maintenance
Each day start
Each day end
Weekly
Every Two Months

Scheduled Maintenance

After first 50 hours
Annually
Every 100 hours or annually
(whichever occurs first)
Every 200 hours or annually
(whichever occurs first)
Every 2 years
Every 1000 hours or 5 years
(whichever occurs first)
According to OEM Schedule
Page 34
• Check the engine oil level. (This interval can be extended based on operator experience with the
product.)
• Check the engine coolant level.
• Check the transmission oil level.
• If operating in saltwater, brackish water, or polluted water, flush the seawater section of the
cooling system after each use.
• Drain any water from the primary fuel filter after each use. (Drain any water from both fuel filters
if operating in freezing temperatures.)
• Drain any water from the fuel filters.
• Check the seawater inlets for debris or marine growth.
• Check and clean the seawater strainer.
• Check the battery connections and fluid level.
• Treat the engine surfaces with Corrosion Guard if operating in saltwater, brackish water, or
polluted waters.
• Inspect the air filter. (Inspect every two months or every 50 hours, whichever occurs first.)
• Inspect the engine anodes and replace if eroded by 50% or more.
• Ensure that the gauges and all wiring connections are secure.
• Clean the gauges. (If operating in saltwater reduce the interval to every 25 hours or 30 days,
whichever occurs first.)
• Clean the transmission oil filter and change the transmission oil.
• Touch‑up the power package with paint and spray with Corrosion Guard.
• Clean the transmission oil filter and change the transmission oil.
• Check the steering system and the remote control for loose, missing, or damaged
parts. Lubricate the cables and linkages.
• Check the engine alignment.
• Torque the engine mounts.
• Check the electrical system for loose, damaged, or corroded terminals.
• Inspect the cooling system and the exhaust system for damage or leaks. Check
both systems hose clamps for tightness.
• Clean the transmission oil filter and change the transmission oil.
• 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.
• Clean the seawater strainer.
• Check the closed cooling fluid level and level of protection.
• Check the run history for faults.
• Check the engine timing belt.
• Replace the engine coolant.
• Replace the engine timing belt.
• Clean the fuel tank.
• Clean the aftercooler core.
• Check the engine to propeller shaft alignment.
90-8M0113988 DECEMBER 2015
eng