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The reliable and durable drive behind your business – Twin Disc deliver over three decades of continuous use from their MG514 gear boxes

The reliable and durable drive behind your business – Twin Disc deliver over three decades of continuous use from their MG514 gear boxes

The engineering excellence of Twin Disc marine gears has again surpassed expectation with Shoreham Port Authority reporting over three decades of continuous use from their MG514 marine gears, which were installed on-board their vessel the ‘Aduri’ in 1984.

With 32 years on the sea, the Adurni, a category 3 workboat, owned by Shoreham Port Authority, has been operating out of Shoreham Port since its build by Delta Shipyard in 1984. The vessel provides vital towing and bed levelling services in the harbours and seas surrounding West Sussex, along with offering both surveying and equipment deployment assignments.

The diversity of services offered by the Adurni means that reliability is key – keeping her at sea and at work, whilst providing smooth and reliable operations for Shoreham Port Authority. Choosing the Twin Disc MG514 marine gearbox at build ensured longevity of service for the hard working vessel, with over 32 years to date use from the originally installed gears.

Adurni Technical Data:

Shipyard Delta Shipyard
Owner Shoreham Port Authority
Type of vessel Workboat
Commissioned 1984
Main Engines 2 x 12V71N GM Detroit Diesel
Total Power 720 bhp
Marine Gears Twin Disc MG514
Ratio: 4.5:1
Overall length 16M
Bollard Pull 10 tonnes

The reliability Shoreham have seen from Twin Disc over the past three decades has made Twin Disc gears the obvious choice for their new tug which is due to join their fleet in July 2018. The new vessel is currently under construction with Macduff Shipyard and will feature 2 x MGX-516 Quick Shift gear boxes and two Doosan V158 engines.

Technical Data:

Type of vessel Tug
Due for Commission July 2018
Main Engines 2 off Doosan V158 TIH 480hp @ 1800rpm
Marine Gears    Twin Disc MGX-516
Breadth 5.40m
Depth 2.90m

Twin Disc Marine Gears

Looking to increase their overall horse power, The MGX-516 gears selected for the new vessel offer a maximum continuous duty of 447kW (600 hp) @1800 RPM along with smooth slow speed, precision shifting and faster, smoother clutch engagement. The Quick Shift gear box achieves this by utilising a sequenced engagement that operates automatically by design and does not need any adjustment. In the first stage of the engagement it makes up to 80% of the maximum oil pressure available to 20% of the clutch piston area, where conventional clutches have to get filled completely at four to five times lower pressure. This allows the clutch to fill much faster, thereby reducing the shift response time dramatically.

On-board the new Shoreham vessel, the MGX-516 gears will be coupled with the Twin Disc EC300 Electronic controls which, together, provide unparalleled boat control in all conditions.

The MGX-516 as standard is supplied with vertical offset, cast iron housing, SAE housing no.1, Electric GP-valve with manual override, EC050 profile module – interface for engagement signals and an oil strainer and filter. The reliability and engineering excellence of Twin Disc marine products allows our customers to be safe in the knowledge that they have only the best fitted on board their business.

Twin Disc have designed and built countless marine products all over the world for almost a century. This unparalleled history and knowledge affords them a unique understanding of the global marine industry. This global R&D perspective yields innovative marine products, which time and time again demonstrate their durability, delivering products that customers can entrust to ensure the operational stability of their business long into the future.

Twin Disc Products are available in the UK and Ireland via MIT.

For further information on Twin Disc, click HERE.

About Shoreham Port Authority

Very popular due to its efficient locks system and impounded inner harbour, Shoreham is a thriving commercial short sea port on the South Coast of England dating back to roman times.

Providing a full range of Marine Services including seabed levelling, Dry Docking and Crew Changes as well as catering for Leisure and commercial fishing, Shoreham Port also offers a full Stevedoring Service with a state of the art Track-A-Pack stock control system, enabling our customers to handle their cargoes quickly and efficiently.

Louise Woolley

Marine and Industrial Transmissions

Marketing Manager


t: +44 (0) 2380 455 447


James Gray

Shoreham Port Authority

Assistant Harbour Master


t: +44 (0) 1273 598100


With thanks to Shoreham Port Authority and MacDuff Shipyard for their input into this article.

Twin Disc Marine Gears