The following are the recommended maintenance intervals for Mitsubishi R and A Series marine propulsion engines as part of an overall maintenance plan including scheduled oil maintenance, oil analysis, and visual inspections:

1. APPROXIMATELY 500 ENGINE HOURS

a. Initial valve setting (break-in)

2. APPROXIMATELY 5,000 ENGINE HOURS

a. Set valves and inspect

3. APPROXIMATELY 10,000 ENGINE HOURS

a. Set valves and inspect
b. Test and adjust injectors, replace as needed

4. APPROXIMATELY 15,000 ENGINE HOURS

a. Set valves and inspect

5. APPROXIMATELY 20,000 ENGINE HOUR

a. Top End Overhaul (Cylinder Heads, Injectors, Rockers, Inspection of external
components such as Charge Air Coolers, Turbos, Water Pumps)

6. REPEAT ITEMS 1 – 4

7. APPROXIMATELY 40,000 ENGINE HOURS

a. Top End Overhaul (Cylinder Heads, Injectors, Rockers, Inspection of external
components such as Charge Air Coolers, Turbos, Water Pumps)

8. REPEAT ITEMS 1 – 4

9. APPROXIMATELY 60,000 ENGINE HOURS

a. Complete Overhaul (includes top end overhaul, plus liners, pistons, and inspection of external components)
b. Replacement Engine

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