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Overview
The Graviner Mk6 Oil Mist Detector is a safety-critical piece of engine room equipment — required by SOLAS and classification society rules to be operational whenever a marine diesel engine is running. Its job is straightforward but vital: continuously monitor the crankcase atmosphere for oil mist concentrations that could indicate an imminent bearing failure or pre-ignition condition, and trigger an alarm or engine slowdown before a crankcase explosion occurs. When the main processor PCB of a Mk6 unit develops a fault — or worse, when the EEPROM soldered onto the main PCB becomes corrupted or fails — the entire detection system goes offline. And an engine cannot be safely operated without a functioning oil mist detector.
The Graviner Mk6 Main PCB and LCD Assembly (Part No. 43782-K178) is a complete replacement kit comprising both the main processor PCB and the LCD display panel for the Graviner Mk6 Oil Mist Detector. This is the kit specifically required when an older version of the main processor board has failed, or when the EEPROM chip soldered directly onto the main PCB has developed a fault — a condition that cannot be resolved by replacing the main PCB alone, because the faulty EEPROM must be removed along with the entire board. The LCD assembly is included because the display is directly tied to the main processor board and must be replaced as a matched pair to restore correct system function.
What makes this kit the correct procurement choice — rather than attempting to source the main PCB and LCD separately — is that the 43782-K178 assembly is the Graviner manufacturer’s own part number for this specific replacement scenario. It is not a workaround or an approximation; it is the intended solution for Mk6 systems with EEPROM-related failures or older-generation main processor board faults. For vessel operators, ship managers, and marine maintenance engineers who need to restore a Mk6 detector to service with confidence in component compatibility and system integrity, the OEM-referenced kit is the appropriate maintenance standard.
Key Features
Complete Replacement Kit — Main Processor PCB and LCD Display Together
The 43782-K178 kit supplies both the replacement main processor PCB and the matched LCD display panel as a single assembly. This matters because in the Mk6 system, the LCD display interface is integrated with the main processor board — replacing the PCB without the correct matched LCD can result in display communication errors or incomplete system restoration. By supplying both components as a factory-referenced kit, the 43782-K178 eliminates the compatibility uncertainty that comes from sourcing these two components separately from different suppliers or different production batches.
Specifically Engineered for EEPROM Failure and Older PCB Versions
The Mk6 main processor PCB carries a soldered EEPROM chip that stores system configuration, calibration data, and operational parameters. When this EEPROM fails — through age, power surge, or data corruption — the entire main processor board must be replaced, because the EEPROM cannot be desoldered and replaced independently under typical vessel maintenance conditions. The 43782-K178 kit is the Graviner-specified solution for this exact failure mode. It is also the correct replacement for older-generation Mk6 main processor PCBs that may no longer support current firmware or system interface requirements. For maintenance engineers diagnosing a persistent Mk6 fault that has not been resolved by other means, EEPROM failure is a known Mk6 failure mode — and this kit is the correct response.
OEM Part Number 43782-K178 — Verified Manufacturer Reference
The Graviner part number 43782-K178 is the manufacturer’s own identification for this main PCB and LCD assembly kit. Sourcing Mk6 replacement components without confirming the correct OEM part number introduces a real risk of receiving a physically similar but functionally incompatible assembly — particularly given the multiple hardware generations and sub-variants the Mk6 has gone through over its service life. The confirmed OEM part number provides the procurement certainty that safety-critical marine equipment maintenance requires.
Restores Full Mk6 Display and Processing Functionality
The main processor PCB is the operational brain of the Graviner Mk6 — handling sensor signal acquisition from the optical mist detection heads, alarm threshold comparison, alarm output management, and display data generation. The LCD panel displays real-time oil mist concentration readings and system status to the operator. A failed main PCB or corrupted EEPROM renders both functions inoperative simultaneously. Replacing the complete 43782-K178 assembly restores both the processing and display functions to original specification in a single maintenance operation.
Available New and Refurbished — Practical Options for Ageing Mk6 Fleets
The 43782-K178 assembly is available in both new and refurbished condition. New stock provides full original specification with no prior service history. Refurbished assemblies have been inspected and tested for functionality before supply — a realistic and cost-effective option for Mk6 systems that have been in service for 15–25 years, where new OEM kit availability may be limited or on extended lead time. For ship managers maintaining ageing Mk6 installations across a fleet, tested refurbished assemblies provide a responsible maintenance solution that keeps operational detectors in service without the cost and lead time of full unit replacement.
Technical Specifications
Kit Contents: Main Processor PCB + LCD Display Assembly
Compatible System: Graviner Mk6 Oil Mist Detector
Manufacturer: Graviner (Kidde / UTC Fire & Security)
Part Number: 43782-K178
Category: Oil Mist Detector Spare Part — PCB & Display Kit
Application: Replacement for failed main processor PCB or faulty soldered EEPROM; replacement for older-generation Mk6 main PCB versions
Condition: New & Refurbished
Use Case: Marine diesel engine crankcase oil mist detection system maintenance
Benefits
Resolves EEPROM failure — the most common unrecoverable Mk6 fault. EEPROM corruption or failure on the Mk6 main processor board is a known failure mode that cannot be addressed by reset, reconfiguration, or partial repair under normal vessel maintenance conditions. The 43782-K178 kit is the manufacturer’s specified solution — not a field workaround — and provides the complete, correct replacement assembly to resolve this fault definitively.
Single kit replaces both matched components in one operation. Sourcing the main PCB and LCD display separately introduces the risk of mismatched component versions and requires coordinating two separate parts orders. The 43782-K178 kit supplies both components as a matched, manufacturer-referenced assembly — simplifying procurement, reducing the risk of compatibility issues, and completing the repair in a single maintenance operation.
Returns the vessel’s crankcase explosion prevention system to compliance. Under SOLAS and class society rules, a non-operational oil mist detector is a deficiency that can restrict engine operations. Resolving a Mk6 main PCB or EEPROM fault with the correct OEM-referenced replacement kit is the fastest and most documentable route to restoring the detector to operational and compliance status.
Avoids full Mk6 unit replacement cost. A complete Graviner Mk6 detector unit replacement is a significantly more expensive and logistically complex maintenance action than replacing the main PCB and LCD assembly. For Mk6 systems where the detector head, enclosure, wiring, and cabling remain serviceable, the 43782-K178 kit restores functionality at component replacement cost — preserving the existing installation.
Refurbished availability supports realistic fleet maintenance economics. For older Mk6 installations where new OEM kit stock may be on extended lead time or premium pricing, tested refurbished assemblies provide a cost-effective alternative that keeps detectors operational without the budget impact of sourcing new OEM stock for ageing equipment.
Who It’s For
The Chief Engineer Dealing with a Persistent Mk6 Fault
The Mk6 on your main engine has been showing persistent fault conditions that haven’t responded to reset or routine maintenance. Your marine electronics engineer has diagnosed the issue as an EEPROM fault on the main processor PCB — a condition that means the entire board needs to come out. You need the correct replacement kit confirmed and sourced before your next port call, and you need to know that the replacement assembly you’re ordering is the right part for your specific Mk6 variant. The 43782-K178 is the kit designed for this situation, and confirming the OEM part number before ordering is the step that eliminates the risk of receiving the wrong assembly.
The Fleet Superintendent Planning Mk6 Maintenance Across Multiple Vessels
You manage planned maintenance across a fleet where several vessels are fitted with Graviner Mk6 oil mist detectors, and some of those units are now old enough that EEPROM-related faults or older-generation PCB failures are becoming a realistic maintenance consideration. You want to understand the correct spare parts solution for this failure mode, confirm the right kit part number, and establish a supply arrangement for new or refurbished 43782-K178 assemblies that supports your fleet maintenance programme without carrying excessive spare parts inventory on every vessel.
The Marine Safety Equipment Service Engineer
You provide Graviner Mk6 service and repair on vessels calling at your port. You encounter EEPROM failures and older-generation PCB faults regularly enough that you need a reliable source for the 43782-K178 kit in both new and refurbished condition — with confirmed OEM part numbers and tested functional status — to service your Mk6 repair contracts efficiently and minimise vessel downtime during port calls.
Possible Applications
- Bulk carriers and general cargo vessels — Main PCB and LCD kit replacement for Mk6 detectors on large-bore two-stroke main engines, addressing EEPROM faults that have developed over long service cycles
- Crude oil and product tankers — Mk6 detector restoration on tanker main propulsion and auxiliary engines where oil mist detection compliance is a continuous operational requirement
- Container ships and ro-ro vessels — Prompt kit sourcing to minimise engine downtime on liner service vessels where port turnaround schedules leave minimal time for extended engine room maintenance
- Offshore support vessels and AHTS vessels — Mk6 system maintenance for offshore-committed vessels where engine room safety system availability is a contract requirement and unplanned downtime has direct commercial consequences
- Passenger vessels and cruise ships — Oil mist detector maintenance on passenger vessel main and auxiliary engines, where class and flag state scrutiny of engine room safety systems is particularly rigorous
- Drydock and class renewal maintenance — Scheduled 43782-K178 kit replacement during five-yearly class renewals or mid-term maintenance periods for Mk6 systems approaching or beyond their original PCB service life expectations
- Fleet spare parts provisioning — Stocking 43782-K178 assemblies for ship management companies managing fleets with Graviner Mk6 installations, particularly where vessels are of an age where EEPROM faults are a realistic failure scenario
- Marine electronics service companies — Kit sourcing for Mk6 service and repair contracts across regional fleets, supporting rapid turnaround on EEPROM and older-generation PCB fault resolution
Trust and Certifications
Graviner — A Long-Established Name in Marine Oil Mist Detection
Graviner has been manufacturing oil mist detection equipment for the marine industry for over 50 years. The Mk6 is one of the most widely deployed oil mist detector platforms in the global commercial fleet — installed as OEM equipment by major shipyards worldwide across multiple vessel generations. The 43782-K178 main PCB and LCD assembly is the manufacturer’s own kit reference for EEPROM failure and older-generation PCB replacement in the Mk6 system, providing OEM-level compatibility assurance that is the correct standard for maintenance of a safety-critical detection system.
SOLAS Compliance Context — Why This Matters Beyond Routine Maintenance
Oil mist detectors on marine diesel engines are required under SOLAS Chapter II-1 and classification society rules (Lloyd’s Register, DNV, Bureau Veritas, ClassNK, American Bureau of Shipping, and others) to be maintained in operational condition whenever the engine is in service. A non-functional Mk6 detector resulting from a failed main processor PCB or corrupted EEPROM is a potential class deficiency. Sourcing the correct replacement kit with a confirmed OEM part number — and documenting the maintenance action with the correct part reference — supports both operational compliance and the vessel’s ISM Code safety management system maintenance records.
Refurbished Assemblies — Inspected and Tested Before Supply
Refurbished 43782-K178 assemblies are inspected and tested for functionality before supply. For a safety system component where operational reliability is directly linked to engine room safety and vessel compliance status, tested refurbished condition provides meaningful functional assurance over untested used components of unknown service history. For Mk6 systems approaching 20 years of service or more, refurbished OEM-referenced assemblies are often the most practical and responsible maintenance solution available.
Supplied by Alright Engineering Solutions
The Graviner Mk6 Main PCB and LCD Assembly (43782-K178) is supplied through Alright Engineering Solutions Pte. Ltd. — a Singapore-based specialist in marine safety system components, oil mist detector spare parts, and fixed and portable gas detection equipment. Alright Engineering Solutions supports vessel operators, ship managers, and marine service companies across the Singapore and regional market with spare parts sourcing, technical component identification, and procurement support.
Accessories and Variants
Graviner Mk6 Main PCB Only — Part No. 44782-K071-02
For Mk6 systems where the main processor PCB requires replacement but the EEPROM is not the failure cause — and the existing LCD display remains functional — the standalone main PCB (44782-K071-02) may be the appropriate replacement component. Alright Engineering Solutions can advise on the correct part selection based on the fault condition and the Mk6 system variant installed on your vessel.
Additional Graviner Mk6 Spare Components
Alright Engineering Solutions can assist with sourcing additional Graviner Mk6 system spare parts — detector heads, optical sensor assemblies, power supply boards, alarm output modules, and associated system components — to support comprehensive Mk6 maintenance programmes and vessel spare parts inventories. Contact our team with your specific Mk6 component requirements and part references for availability and quotation.
Graviner Mk4 and Mk5 Components
For vessels equipped with earlier Graviner oil mist detector generations, including the Mk4 and Mk5 platforms, Alright Engineering Solutions can advise on spare parts availability and sourcing options. Contact our team with the specific Graviner model and part number for your vessel’s installation.
Related Products from Alright Engineering Solutions
Graviner Mk6 Main PCB (44782-K071-02) — Standalone main PCB replacement for Mk6 systems without EEPROM-related faults
Salwico CS3000 Display LCD PCB (BTM-4 R2, S-4-007815) — Refurbished replacement display PCB for Salwico CS3000 fixed gas detection system
GX-8000 Sample Draw Multi Gas Monitor — Portable marine sample draw multi-gas monitor for vessel confined space entry
RX-8700 Portable Gas Detector — ATEX/IECEx/MED-certified portable multi-gas monitor for marine applications
Get in Touch
If you need to source the Graviner Mk6 Main PCB and LCD Assembly (43782-K178) — whether for an urgent EEPROM fault repair, an older-generation PCB replacement, scheduled drydock maintenance, or fleet spare parts provisioning — contact Alright Engineering Solutions to confirm availability in new or refurbished condition and request a formal quotation.
Our team can also assist with identifying the correct Mk6 kit for your specific fault condition, and sourcing additional Graviner Mk6 spare parts and related marine engine room safety equipment components for your vessel or fleet maintenance programme.
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