Duties of 4th Engineer in the Merchant Navy

Last updated on March 10th, 2023 at 10:47 am

4th Engineers or 3rd Assistant Engineers are officers in the engine department of a ship. Trainee Marine Engineers after completing their required sea time are eligible to appear for the MEO Class IV exams. After successfully clearing these exams they can board a ship as a Junior Engineer and are further promoted to the rank of a 4th Engineer after gaining some experience onboard. In this blog, we will deep dive into the duties of a 4th Engineer in the Merchant Navy. 

4th Engineer in the merchant navy
4th Engineer in the merchant navy

General Duties of 4th Engineer in Merchant Navy

4th Engineers must keep the Chief Engineer fully informed about any concerns regarding their responsibilities.

4th Engineer is responsible to the Chief Engineer and 2nd Engineer for: 

Watchkeeping Duties of 4th Engineer in Merchant Navy

4th Engineers have to carry out watchkeeping as per the schedule and assist in the engine room during maneuvering.

They are further responsible for the performance of cargo-related machinery and systems – ballast water treatment systems, ballast system valves and pumps, cranes/gantries, auxiliary engines, etc. 

Performing other duties as directed.

duties of 4th engineer
duties of 4th engineer

Maintenance Duties of 4th Engineer in Merchant Navy

4th Engineers have to personally supervise and carry out the maintenance and repair of :

  • Main, auxiliary, and emergency compressors and control air system (3rd Engineer).
  • Fuel oil and lube oil purifiers and filters (3rd Engineer)
  • Fuel transfer system and equipment (3rd Engineer)
  • The sewage treatment plant, pumps, and piping system (3rd Engineer)
  • Other auxiliary machinery in the engine room (2nd Engineer)
  • Testing of engine room blowers and funnel flaps (3rd Engineer)

Administration and Recordkeeping Duties of 4th Engineer in Merchant Navy

4th Engineers have to maintain the Planned Maintenance Schedules and machinery history records.

They need to take inventory and prepare requisitions for spare parts for equipment under their charge. 

They also have to assist in fuel and lube oil transfers and maintain records. (3rd Engineer)

4th Engineers have to assist in bunkering. (3rd Engineer)

maintenance duty of 4th engineer
maintenance duty of 4th engineer

Key Performance Duties

In addition to the duties mentioned above a 4th Engineer also has to take care of the following things – 

  • No overdue maintenance or testing of critical machinery/equipment in PMS in own areas of responsibility. 
  • No critical machinery/equipment is inoperative in its own areas of responsibility. 
  • No critical safeties inoperative or bypassed for any machinery/equipment in own areas of responsibility. 
  • No spares to be below minimum and critical spares requirement in own areas of responsibility. 
key performance duties
key performance duties

4th Engineer Salary in Merchant Navy

4th Engineers are the junior officer in the engine department. Hence, they are paid a lesser salary compared to their senior officer. However, it doesn’t mean that they do not get highly paid. The average salary of most 4th Engineers sailing in different types of vessels is around 2500$ – 4200$.  

salary in merchant navy
salary in merchant navy

4th Engineer Salary in Merchant Navy in LNG/LPG Tankers

LNG/LPG Tankers offer the highest salaries in the merchant navy to sailing seafarers. These tankers carry high-value commodities such as butane, propane, compressed natural gas, etc. The machinery onboard these vessels is really complicated therefore the salary is also high. 4th Engineers sailing onboard these tankers are paid in the range of 3500$ – 4200$ per month.

LNG Tankers
LNG Tankers

4th Engineer Salary in Merchant Navy in Chemical Tankers

Chemical Tankers carry hazardous cargo such as tallow, methanol, caustic soda, sulphuric acid, etc. There are a lot of risks involved in handling such cargo. Chemical tankers also offer really high salaries to seafarers working onboard them. 4th Engineers sailing onboard Chemical Tankers are paid around 3500$ – 4000$ per month.

Chemical Tankers
Chemical Tankers

4th Engineer Salary in Merchant Navy in Crude Oil/Product Tankers

Crude Oil Tankers are vessels that carry unrefined crude oil while Product Tankers are vessels that carry clean petroleum products such as gasoline, naphtha, etc. Both these vessels offer almost the same amount of salary. 4th Engineers sailing onboard these tankers are paid in the range of 2800$ – 3800$ per month. 

Crude Oil Tankers
Crude Oil Tankers

4th Engineer Salary in Merchant Navy in Bulk Carriers/Container Ships 


Dry ships such as Bulk Carriers and Container Ships pay relatively lesser salaries compared to Tankers to its employees. Bulk carriers carry unpackaged dry goods such as coal, grain, ore, etc. While Container ships carry manufactured goods such as machinery, furniture, footwear, garments, etc. 4th Engineers sailing in Bulk Carriers/Container Ships are paid in the range of 2400$ – 3600$ per month.

Bulk Carriers
Bulk Carriers
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Shubham Priyadarshi
Shubham Priyadarshi
10 months ago

I read this blog and it gave me a clear vision about 4th engineer. And also I wish to know that which kind of opportunities are going to be opened after becoming a chief engineer at shore? How much they get paid after becoming a technical supritendent and what is your personal thought about shore job as you’re a chief engineer 😍

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