Outboard · 4 Stroke EFI · serial 3B266064 and up
Verado 400 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
- 90-8M0188523
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)
Know your engine · parts catalog
Exploded drawings of the systems maintenance touches
Drawings from Mercury parts catalog 90-8M0188523; live price and stock on every part.
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.