DAIHATSU MD-14M OIL MIST DETECTOR

Complete Marine Technical Blog | SM MARINE SERVICE™

DESCRIPTION

Manufacturer

Daihatsu Diesel Mfg. Co., Ltd.

Country of Origin

Japan

Product Type

Marine Crankcase Oil Mist Detector

Marine Application

Installed on Daihatsu marine diesel engines to continuously monitor crankcase oil mist concentration and protect the engine from dangerous crankcase explosions.

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Product Introduction

The Daihatsu MD-14M Oil Mist Detector is an essential engine protection device used on many Daihatsu auxiliary and propulsion diesel engines. It continuously samples air from each crankcase compartment and measures oil mist density.

If abnormal oil mist concentration is detected, the system immediately provides warning and shutdown signals, allowing engineers to prevent serious engine damage or crankcase explosions.

The unit shown in your photograph includes:

• Oil Mist Density Indicator
• Final Alarm Indicator
• Slight Alarm Indicator
• Trouble Indicator
• Normal Status Indicator
• Rotary Valve Indicator (Crankcase Number Selector)
• Reset/Test Buttons
• Source Monitoring Circuit

This model has been widely installed on merchant vessels, offshore vessels, tankers, container ships, and power generation systems using Daihatsu marine engines.

SM MARINE SERVICE™ supplies complete MD-14M systems, spare parts, repair services, calibration, and worldwide technical support.

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What Is the Daihatsu MD-14M Oil Mist Detector?

The MD-14M is a dedicated crankcase monitoring system that continuously extracts air samples from each crankcase compartment through a rotary sampling valve. The sampled air passes through an optical measuring chamber where the oil mist concentration is analyzed.

If the oil mist level exceeds the preset threshold, the detector activates:

• Slight Alarm
• Final Alarm
• Engine Protection Signal
• Remote Alarm Output
• Shutdown Interface (if configured)

This early warning significantly reduces the risk of catastrophic crankcase explosions.

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Main Features

• Continuous crankcase monitoring
• Automatic rotary sampling valve
• Optical oil mist measurement
• Multi-cylinder monitoring
• LED oil mist density indication
• Slight Alarm output
• Final Alarm output
• Trouble monitoring
• Self-diagnostic function
• Manual test capability
• Reset function
• High reliability for marine applications
• Long service life
• Easy maintenance

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Main Components

A complete Daihatsu MD-14M system generally includes:

• Main Control Unit
• Oil Mist Density Indicator
• Rotary Sampling Valve
• Sampling Manifold
• Sampling Pipes
• Optical Measuring Chamber
• Air Pump
• Alarm Circuit
• PCB Assembly
• Power Supply
• Relay Module
• Crankcase Selector Mechanism
• Filter Assembly
• Calibration Components

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Marine Applications

The MD-14M is commonly installed on:

• Daihatsu Auxiliary Engines
• Daihatsu Main Engines
• Generator Engines
• Power Generation Plants
• Cargo Ships
• Tankers
• Bulk Carriers
• Offshore Supply Vessels
• LNG/LPG Carriers
• Passenger Ships

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Common Problems & Troubleshooting

Typical service issues include:

• Dirty optical chamber
• Blocked sampling pipes
• Rotary valve malfunction
• Air pump failure
• False oil mist alarms
• Alarm relay failure
• PCB defects
• Power supply problems
• Indicator failure
• Sensor contamination
• Internal communication faults
• Calibration drift

Routine inspection and calibration help maintain accurate oil mist detection performance.

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Maintenance Tips

• Clean the optical chamber at scheduled intervals.
• Inspect sampling lines for blockage or leakage.
• Verify rotary valve operation.
• Test Slight Alarm and Final Alarm functions.
• Replace filters when necessary.
• Perform periodic calibration.
• Confirm correct sampling sequence from every crankcase.
• Check electrical terminals and connectors.

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Why Ships Still Use the MD-14M

Although newer digital oil mist detectors are available, the Daihatsu MD-14M remains popular because of its:

• Proven reliability
• Stable optical measurement
• Rugged construction
• Simple maintenance
• Long operating life
• Availability of spare parts
• Excellent compatibility with older Daihatsu engines

Many vessels continue operating this system successfully after decades of service with proper maintenance.

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Frequently Asked Questions (FAQ)

Can the Daihatsu MD-14M be repaired?

Yes. Most electronic boards, optical units, sampling valves, pumps, and alarm circuits can be repaired and tested.

Do you supply spare parts?

Yes. SM MARINE SERVICE™ supplies complete MD-14M systems and spare parts including PCB boards, optical chambers, sampling valves, pumps, filters, indicators, relay boards, and accessories.

Can you calibrate this system?

Yes. We provide calibration, functional testing, repair, overhaul, and technical support.

Do you supply reconditioned units?

Yes. New, Used, and Professionally Reconditioned MD-14M systems are available depending on customer requirements and budget.

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Short Product Description

The Daihatsu MD-14M Oil Mist Detector is a reliable marine crankcase monitoring system designed to detect abnormal oil mist concentration before dangerous crankcase explosions occur. It remains one of the most dependable protection systems used on Daihatsu marine diesel engines worldwide.

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User Manual & Technical Resources

Available technical documentation includes:

• Daihatsu MD-14M Operation Manual
• Service Manual
• Maintenance Manual
• Installation Manual
• Wiring Diagram
• Calibration Procedure
• Spare Parts Catalogue
• Troubleshooting Guide
• Technical Specifications
• Sampling System Diagram

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SM MARINE SERVICE™

SM MARINE SERVICE™ supplies Daihatsu MD-14M Oil Mist Detectors, complete systems, spare parts, PCB boards, rotary sampling valves, optical measuring units, alarm modules, repair services, calibration, testing, and worldwide technical support.

Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse & Support Center
Shanghai, China

Products Available

• New Equipment
• Used Equipment
• Professionally Reconditioned Equipment

Services

• Worldwide Supply
• Spare Parts
• Repair
• Calibration
• Functional Testing
• Technical Support
• Global Shipping

Website: www.smmarineservice.com

Email: info@smmarineservice.com

WhatsApp: +8801818929292

Marketing Contact: Nazmul Hasan Bhuiyan

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