6LY3-STP
Yanmar 6LY3-STP: 440 hp (324 kW) at 3300 rpm, 5.813-litre electronically controlled, turbocharged and intercooled six-cylinder marine diesel.
The 6LY3 is the electronically controlled generation of Yanmar's 5.813-litre (106 x 110 mm) six-cylinder: 24 valves, turbocharger, sea-water-cooled intercooler and wastegate, with Yanmar's electronic governor, CAN-bus display and electronic controls. There are three pleasure ratings: 6LY3-ETP (480 mhp), 6LY3-STP (440 mhp) and 6LY3-UTP (380 mhp), all at 3300 rpm and all 640 kg dry without gear. Yanmar offers them with Kanzaki KMH61A (angle) or KMH61V (V-drive) gears. Commercial 6LY3-STC and 6LY3-UTC ratings also exist and are not covered here.
The 6LY3 was superseded by the common-rail 6LY400 and 6LY440 (6LY-CR), which Yanmar's European site listed from about 2015-2016.
The STP is the middle rating, with the same 440 mhp output as the mechanically injected 6LY2A-STP.
Specifications
Power
- Power
- 440 hp
- Power (kW)
- 324 kW
- Rated speed
- 3300 rpm
Engine
- Configuration
- inline 6
- Cylinders
- 6
- Displacement
- 5.813 L
- Aspiration
- turbo, intercooled
- Weight
- 640 kg
- Fuel
- Diesel
- Mounting
- Inboard
Reviews
No independent reviews on file yet.
Sources
- 1. 6LY3-STP datasheet (EN_DS6LY3-STP_0113) — Yanmar Marine International
- 2. 6LY3-STP — Yanmar Marine International
- 3. 6LY Series parts categories with production dates — Oldport Marine
- 4. Search engines: powerboat, status current (August 2020) — Yanmar Marine International
- 5. Search engines: powerboat, status current (January 2026) — Yanmar Marine International
Specifications compiled from manufacturer sources.