Yanmar 4BY, Service Manual, Page: 54 / 275

PERIODIC MAINTENANCE
BY Service Manual 4-11
Periodic Maintenance Procedures
PERIODIC MAINTENANCE
PROCEDURES
Perform the following maintenance after the initial
50 hours of operation.
• Change the Engine Oil and Replace the
Engine Oil Filter
• Check Shift Cable Adjustment
• Adjust the Propeller Shaft Alignment (If
Equipped with Marine Gear)
After you complete the initial 50 hour maintenance
procedures, perform the following procedures every
50 hours or monthly thereafter.
• Check Seawater Filter (If Equipped) and Inlet
• Check the Air Intake Pipes
• Check Battery Electrolyte Level (Serviceable
Batteries Only)
Perform the following maintenance every 250 hours
or one year of operation.
• Drain Water and Sediment from Fuel Tank
• Replace the Fuel Pre-Filter
• Replace the Fuel Fine Filter
• Replace the Fuel Filter / Water Separator
Element
• Change the Engine Oil and Replace the
Engine Oil Filter Element
• Check / Replace the Seawater Pump Belt
• Replace the Zinc Anodes
• Check or Replace the Seawater Pump Impeller
• Replace the Turbocharger Heat Shield
• Check the Exhaust / Water Mixing Elbow
• Clean or Replace the Air Filter Element
• Check / Change the Alternator Belt
• Check / Change the Power Steering Fluid
• Check the Shift Cable Adjustment
• Adjust the Propeller Shaft Alignment
• Check the Hydraulic Oil Cooler
• Check or Replace Rubber Hoses
Perform the following maintenance every 500 hours
or 2 years of operation.
• Check Fuel Pump and Fuel Lines
• Drain and Refill Closed Cooling System
(Engine Coolant)
After Initial 50 Hours of Operation
Every 50 Hours of Operation
Every 250 Hours of Operation
Every 500 Hours of Operation