Outboard · 4 Stroke EFI · serial 3B272954 and up
Racing 400 R HP service and maintenance
The Mercury maintenance schedule, the steps and parts of every procedure, exploded catalog drawings, official Mercury videos and the owner's manual. Source: Mercury operation and maintenance manual 8M0229558.
Showroom page: price, specifications, documents →
Step narratives, plan names and glossary definitions come from the Merkür Deniz workshop records and are in Turkish for now; intervals, step counts, parts lists, prices and capacities read the same in any language.
- Power
- 400 HP
- Engine oil
- 9.5 L
- Gearcase
- 1.4 L / 1.6 L
- Catalog
- 90-8M0188524
Maintenance schedule
4 procedures by engine hours and calendar
First service
3 steps · 4 parts · 1 h
Steps and parts →100hours / yearAnnual service
15 steps (4 dealer) · 8 parts · 3.5 h
2 videos
Steps and parts →300hours / 3 yearsMajor service
9 steps (6 dealer) · 11 parts · 6 h
Steps and parts →SeasonendWinterization and storage
7 steps (1 dealer) · 6 parts · 3 h
1 video
Steps and parts →Interval rule: hours or calendar, whichever comes first. In salt water, anodes, spark plugs and lubrication points are checked more often.
Every trip
Checks the boat owner does
Pre-use check · 8 checks
Before every trip, a few minutes. Done with the engine off.
- Lanyard stop kontrolü
- Pervane hasar kontrolü
- Hidrolik direksiyon bağlantıları (varsa)
- Direksiyon kontrolü
- Motor yağı seviyesi
- Yakıt sistemi kaçak kontrolü
- Power steering yağ seviyesi (varsa)
- Transom sıkılığı
After-use care · 3 checks
After every trip; always after salt, dirty or muddy water.
- Tuz temizliği (tuzlu su)
- Powerhead tuz kontrolü (tuzlu su)
- Soğutma sistemi flush (tuzlu/kirli/çamurlu su)
Videos
Mercury's official walkthroughs for this engine
Capacities and oils
Values specific to this model
| System | Capacity | Oil / spec | Mercury product |
|---|---|---|---|
| Engine oil (with filter) | 9.5 L | 25W-40 Syn Blend (400R: 25W-50 Racing) | 92 8M0206956 (4 L)92 8M0206955 (1 L) |
| Gearcase (lower unit) oil · 5.44 standart | 1.4 L | Extreme Gear Lube | 8M0111677 (946 ml) |
| Gearcase (lower unit) oil · 5.44 HD/Sport Master | 1.6 L | Extreme Gear Lube | 8M0111677 (946 ml) |
Source: 8M0229558 and the accessory catalog quick-reference table; confirmed by the Merkür Deniz service team.
This page is information compiled from the Mercury manual; steps marked as dealer work require Mercury dealer training and tools. During the warranty period, maintenance must be recorded at an authorized dealer.