^AABJ — RT-flex68T-B

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Zulu Code Model

Description

Wärtsilä RT-flex68T-B — a large-bore electronically controlled engine for Capesize bulkers and Suezmax tankers, delivering 18,000-22,000 kW MCR.

Specifications

Cycle	2-Stroke
Bore	680 mm
Fuel Injection	Common rail (RT-flex)

Did you know

The Wärtsilä Sulzer RT-flex68T-B engine type was announced in January 2004, building upon the Sulzer RT-flex common-rail system which began development in 1993. The first series-built RT-flex production engine, a Sulzer 6RT-flex58T-B, entered service in September 2001.
The RT-flex68T-B is part of the broader Sulzer RT-flex series, which introduced electronically-controlled common-rail systems for fuel injection and valve actuation to low-speed marine engines. Within this range, it sits alongside models with varying cylinder bores, such as the RT-flex50, RT-flex58T-B, RT-flex60C, RT-flex84T-D, and the larger RT-flex96C.
This model, like other RT-flex engines, offers benefits such as smokeless operation across all speeds, lower fuel consumption, reduced maintenance needs, and stable running at very low speeds due to its flexible, electronically-controlled common-rail system.

Model	Cylinder Bore (mm)	Piston Stroke (mm)	Power (kW/cyl)	Speed (rpm)
RT-flex68T-B	680	2720	3070	105
RT-flex58T-B	580	2416	2180	105
RT-flex96C	960	2500	5720	102

Sources: ihmc.us; ihmc.us; wartsila.com; wartsila.com; wartsila.com; wartsila.com; wartsila.com; swiss-ships.ch; engine.od.ua

Competitive Models

Similar models from other manufacturers — apple to apple.

^AAAA G50ME-C

G50ME-C is a MAN B&W 2S model, coded ^AAAA. Typical service: primary propulsion at sea; shaft drive to propeller. Instal…

^AAAE G95ME-C

G95ME-C is a MAN B&W 2S model, coded ^AAAE. Typical service: primary propulsion at sea; shaft drive to propeller. Instal…

^AAAD G80ME-C

G80ME-C is a MAN B&W 2S model, coded ^AAAD. Typical service: primary propulsion at sea; shaft drive to propeller. Instal…

^AAEA 6EY26W

Yanmar 6EY26W — a 6-cylinder medium-speed four-stroke main engine with 260mm bore. Compact design for coastal tankers, f…

^AAAF S50ME-C

S50ME-C is a MAN B&W 2S model, coded ^AAAF. Typical service: primary propulsion at sea; shaft drive to propeller. Instal…

Spares

Positions 1–12 are the same part on every engine and are safe to quote by code. 13 and 14 vary with cylinder count.

1Cylinder Liner — page under construction
2Piston — page under construction
3Fuel Injector Nozzle — page under construction
4Cylinder Head / Cover — page under construction
5Connecting Rod — page under construction
6Main Bearing — page under construction
7Bottom-End (Crankpin / Con-Rod) Bearing — page under construction
8Fuel Injection Pump — page under construction
9Fuel Injector (Complete) — page under construction
10Exhaust Valve — page under construction
11Inlet Valve — page under construction
12Piston Ring Set — page under construction
13Crankshaft — page under construction
14Camshaft — page under construction

Send enquiry

Send an enquiry to the manufacturer of ^AABJ RT-flex68T-B. One broadcast per day.

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Spotted a missing or incorrect entry? Let the maintainers know. Zulu Code is open under CC BY 4.0 — every correction strengthens the standard for the whole industry.

Code map

^A  A  B  J
 │  │  │  └── Model: RT-flex68T-B
 │  │  └───── Make: Wärtsilä Sulzer
 │  └──────── Equipment: Main Engine
 └─────────── System: ME, Propulsion & Steering