Cart (
Overview
Precision in a crankcase oil mist detection system is not just about the electronics — it starts with the mechanical integrity of every component that positions and holds the detector’s optical and sensing elements in correct alignment. The locating spigot in the Graviner Mark 5 Oil Mist Detector is one of those foundational mechanical components. It functions as a precision locating feature that ensures the correct positional relationship between mating parts within the detector assembly. When the spigot is worn, damaged, or missing, the components it locates can shift out of position — introducing misalignment that undermines measurement accuracy and, in severe cases, causes intermittent detection faults that are difficult to diagnose without component-level inspection.
The Locating Spigot for Graviner Mark 5 Oil Mist Detector (Part No. 23617-403) is a refurbished replacement locating spigot for the Graviner MK-5 detector unit. This small but positionally critical component restores correct mechanical alignment within the detector assembly — returning the MK-5 to its original dimensional specification and ensuring that the optical and sensing elements it supports are held in their designed operating position.
What makes this the correct procurement decision is the same reason it matters for any precision-located mechanical component: part number specificity. The 23617-403 designation is the OEM-referenced part number for this locating spigot within the Graviner Mark 5 product family. For ship engineers and procurement teams who need a confirmed-fit replacement — not a dimensionally approximate substitute — the OEM part number provides the identification certainty that assembly-critical mechanical components require.
Key Features
OEM Part Number 23617-403 — Confirmed Dimensional Fit for Graviner MK-5
The 23617-403 part number is the manufacturer’s own reference for this locating spigot within the Mark 5 detector platform. A locating spigot performs its function through precise dimensional compliance — the spigot diameter, height, and seating geometry must match the mating bore and face it locates against exactly. A substitute component sourced without confirmed part number verification introduces the risk of a dimensional mismatch that defeats the spigot’s locating function entirely. The OEM part number eliminates that risk and provides the documentary confirmation needed for spare parts records.
Mechanical Alignment and Positional Accuracy
The locating spigot’s primary function is to establish and maintain the correct positional relationship between two mating components within the MK-5 detector assembly. In an optical detection system where measurement accuracy depends on the photocell and light source being held within a tightly controlled spatial relationship, the mechanical components that govern that relationship — including locating features like spigots — are directly connected to the detector’s measurement performance. Replacing a worn or missing spigot restores the assembly’s designed positional accuracy and the detection reliability that depends on it.
Refurbished Condition — Inspected for Dimensional Integrity
The locating spigot is supplied in refurbished condition, inspected for dimensional integrity and physical condition before supply. For a precision-located mechanical component, dimensional inspection before supply is the relevant quality check — confirming that the spigot’s critical dimensions are within the tolerances required for correct fit and function in the MK-5 assembly. Refurbished OEM-referenced availability also provides the practical procurement solution for MK-5 systems where new OEM mechanical spare components are discontinued or available only as part of a complete sub-assembly.
Durable Material Construction for Detector Operating Environment
As visible in the component image, the locating spigot is a machined washer-form component with a precision-ground central bore — a design that reflects its role as a positional locating element within a mechanical assembly. The material and surface finish are specified to maintain dimensional stability under the temperature variation, vibration, and oil mist atmosphere exposure conditions of the MK-5 detector’s installed environment on a running marine diesel engine. A component that maintains its dimensional specification across the service interval is what makes reliable long-term alignment possible.
Enables Component-Level MK-5 Detector Overhaul
The availability of individual OEM-referenced mechanical components — including locating spigots — enables service engineers and ship repair facilities to carry out thorough component-level MK-5 overhauls rather than defaulting to complete unit replacement. During a systematic MK-5 overhaul, mechanical wear components including locating features, seals, and housings are routinely replaced to restore the detector to its original mechanical specification. Individual component availability at reasonable cost is what makes that overhaul approach economically viable for fleet operators managing MK-5 maintenance across multiple vessels.
Technical Specifications
Component: Locating Spigot
Part Number: 23617-403
Compatible System: Graviner Mark 5 (MK-5) Oil Mist Detector
Manufacturer: Graviner (Kidde / Carrier Global)
Model: MK-5
Description: MK-5 Oil Mist Detector Locating Spigot
Form: Precision washer-form component with central bore
Function: Positional location of mating components within MK-5 detector assembly
Condition: Refurbished
Benefits
Restores correct mechanical alignment within the MK-5 detector assembly. A worn or missing locating spigot allows mating components to shift out of their designed positional relationship — introducing misalignment that can manifest as erratic readings, reduced detection sensitivity, or intermittent faults. Replacing the spigot with the OEM-referenced 23617-403 component restores the assembly to its designed dimensional specification and the measurement reliability that depends on it.
Resolves difficult-to-diagnose misalignment faults at low component cost. Intermittent MK-5 faults caused by mechanical misalignment are among the more time-consuming to diagnose, because the fault condition may not be immediately obvious at the electronic or optical level. When a component-level inspection identifies a worn or missing locating spigot as the root cause, replacement with the correct OEM part resolves the fault at minimal component cost — compared to the time and cost of chasing an electrical or optical fault that is actually mechanical in origin.
Supports systematic MK-5 overhaul without complete unit replacement cost. For fleet operators and technical superintendents managing MK-5 detector maintenance across multiple vessels, the ability to replace individual mechanical wear components — including locating spigots — during planned overhaul programmes extends detector service life at a fraction of the cost of complete unit replacement. A detector that is mechanically overhauled to specification alongside its optical and electronic components delivers renewed service life without the procurement lead time or cost of a new detector unit.
Maintains detector compliance with class society crankcase protection requirements. Classification societies require crankcase oil mist detectors to be maintained in fully operational condition to the manufacturer’s specification. A detector with worn mechanical components that degrade its measurement accuracy or reliability does not meet that standard. OEM-referenced mechanical component replacement during overhaul maintains the detector’s compliance standing and supports the vessel’s safety management system maintenance records.
OEM part number provides procurement certainty for safety-critical spare components. For a precision-located mechanical component like the 23617-403 spigot, dimensional correctness is the only acceptance criterion that matters. The OEM part number provides the procurement certainty — and the spare parts documentation traceability — that assembly-critical components in a crankcase safety detection system require.
Who It’s For
The Ship’s Chief Engineer or Electrical Officer Carrying Out MK-5 Maintenance
During a planned maintenance inspection or in response to a detector fault, you’ve stripped down an MK-5 detector unit and identified a worn or damaged locating spigot that needs replacement before the detector is reassembled and returned to service. You need the correct OEM-referenced part — 23617-403 — confirmed and sourced quickly enough to complete the maintenance within your vessel’s port call or scheduled maintenance window. You need a supplier who can confirm the part, provide it in inspected refurbished condition, and support the documentation your maintenance log requires.
The Technical Superintendent Planning a Fleet MK-5 Overhaul Programme
You’re planning a systematic MK-5 detector overhaul across a managed fleet during the next drydock cycle — replacing internal mechanical wear components across detector units that are now 15 to 20 years into service. Your overhaul BOM includes locating spigots as a routine replacement item alongside photocell housings, toroids, and sealing components. You need a specialist supplier who maintains stock of individual OEM-referenced MK-5 mechanical components and can supply the quantities required for a fleet overhaul programme at commercially reasonable pricing with appropriate lead times.
The Marine Equipment Service Engineer Carrying Out MK-5 Overhauls Under Contract
You service and overhaul Graviner Mark 5 detectors for vessel operators as part of an annual maintenance or drydock service contract. Locating spigot replacement is a routine element of a thorough MK-5 mechanical overhaul, and you need a reliable source of OEM-referenced 23617-403 components in refurbished condition to maintain your service stock. You need a supplier who understands the MK-5 component range, can confirm part compatibility across detector variants, and provides the component documentation your service records require.
Possible Applications
- Bulk carriers and general cargo vessels — Locating spigot replacement during planned MK-5 detector maintenance on vessels with medium-speed diesel main engines where component-level overhaul is the preferred maintenance approach
- Tankers and chemical carriers — MK-5 mechanical overhaul component sourcing to maintain crankcase detection system reliability on vessels with heightened engine room safety management requirements
- Container ships and ro-ro vessels — Fault investigation and component repair on MK-5 detectors producing intermittent readings or faults attributable to mechanical misalignment within the detector assembly
- Offshore support vessels and platform supply vessels — Emergency and planned spare component sourcing for MK-5 detectors on offshore vessels where OEM supply lead times are not compatible with the vessel’s operational schedule
- Drydock and ship repair facilities — Mechanical overhaul of MK-5 detector units during class renewal surveys and scheduled drydocking as part of engine room safety system maintenance programmes
- Fleet spare parts stock provisioning — Advance stock procurement of MK-5 mechanical spare components for ship management companies maintaining spare parts inventories across managed fleets
- Marine safety equipment service contractors — Component sourcing to support MK-5 detector overhaul, recertification, and maintenance contracts in Singapore and across the regional market
Trust and Certifications
Graviner Mark 5 — The Global Standard for Marine Crankcase Oil Mist Detection
The Graviner Mark 5 is the most widely deployed crankcase oil mist detection system in the marine industry, with a multi-decade service history and installations across tens of thousands of vessels worldwide. Originally developed by Graviner Ltd. and now part of the Kidde / Carrier Global portfolio, the MK-5 holds type approvals from all major classification societies — Lloyd’s Register, DNV, Bureau Veritas, American Bureau of Shipping, ClassNK, and others — and is recognised as the industry reference platform for marine diesel engine crankcase protection. Maintaining the MK-5 to its original mechanical specification using OEM-referenced components preserves the detector’s type-approved performance and the vessel’s compliance with its class society’s crankcase detection requirements.
Refurbished and Inspected — Dimensional Condition Assessed Before Supply
The locating spigot is supplied in refurbished condition, inspected for dimensional integrity and physical condition before supply. For a precision-located mechanical component, dimensional condition is the critical quality parameter — and inspection before supply provides the assurance appropriate for a component within a crankcase safety detection system. The refurbished condition designation also reflects the practical supply chain reality for mature MK-5 variants, where individual mechanical spare components are frequently unavailable as new OEM stock through standard distribution channels.
Supplied by Alright Engineering Solutions
The Graviner Mark 5 Locating Spigot (Part No. 23617-403) is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based specialist supplier of marine safety and gas detection equipment and spare components. Alright Engineering Solutions supports vessel operators, ship management companies, and marine service contractors with component sourcing, procurement assistance, and spare parts availability enquiries for marine safety systems across Singapore and the wider regional market.
Accessories and Variants
Additional Graviner Mark 5 Mechanical and Internal Spare Components
Alright Engineering Solutions can assist with sourcing a full range of Graviner Mark 5 internal and mechanical spare components — photocell housings, toroids, photocell assemblies, detector heads, sealing components, and associated MK-5 system parts — for component-level overhaul programmes and fleet spare parts provisioning. Contact our team with your complete MK-5 component list and part references for availability confirmation and quotation.
Related MK-5 Spare Components Available from Alright Engineering Solutions
Graviner Mark 5 Photocell Housing (Part No. 45626-122) — Refurbished replacement optical assembly enclosure for MK-5 detector units
Graviner Mark 5 Toroid (Part No. 44211-115) — Refurbished replacement inductive signal processing component for MK-5 detection circuit
Graviner Mark 5 Photocell Assembly — Complete optical sensing assembly replacement for MK-5 detectors
Graviner Mark 5 Detector Head — Replacement detector head units for MK-5 crankcase oil mist detection systems
RX-8700 Portable Gas Detector — ATEX/IECEx/MED-certified portable multi-gas monitor for marine confined space and engine room applications
Get in Touch
If you need to source the Graviner Mark 5 Locating Spigot (Part No. 23617-403) for a detector repair, planned overhaul, or fleet spare parts programme — contact Alright Engineering Solutions to confirm availability and request a formal quotation.
Our team can assist with sourcing a complete list of Graviner Mark 5 mechanical and internal spare components for systematic detector overhaul programmes across single vessels or managed fleets.
📍 3791 Jalan Bukit Merah #06-01, E-Centre @ Redhill, Singapore 159471
