Network company of Kyoei Engine Service Co., Ltd., Japan
Engine maintenance, overhaul, diagnostic analysis and spare parts supply for marine and industrial machinery. Delivered on board in your engine room or at our workshop in the Port of Tanjung Priok, Jakarta.
01 · About us
PT Untaian Mutiara Jaya (UMJ) is a marine engineering company established in 2020, specialising in engine maintenance, overhaul, diagnostic analysis, technical services and spare parts supply for the maritime industry.
Together with Kiran Marine Parts, UMJ is a network company of Kyoei Engine Service Co., Ltd., Japan. Our local team is backed by the technical experience and network of our Japanese principal.
Our workshop is located in the Port of Tanjung Priok, Jakarta, so when your vessel is alongside, we are close by. With a dedicated workshop facility and a skilled, experienced technical team, we keep our clients' fleets in top condition and operating reliably.
Genuine and OEM spare parts for main engines, auxiliary engines and shipboard equipment.
Troubleshooting, repair, overhaul and diagnostics, on board or at our workshop.
Technical support and network backing from Kyoei Engine Service Co., Ltd., Japan.
02 · Vision & mission
To be a trusted marine engineering partner through reliable maintenance solutions, technical expertise and innovative diagnostic services that improve vessel operational reliability.
Mission
Deliver reliable maintenance and overhaul services with consistent quality.
Provide accurate technical recommendations based on inspection and diagnostic data.
Supply quality marine spare parts that support efficient vessel operations.
Continuously develop the competence and technical capability of our engineers.
Build long-term partnerships through professionalism, integrity and responsive customer support.
03 · Our services
Spare parts, skilled engineers and a workshop within a single network. One point of contact, one point of responsibility.
Decades of combined experience across shipboard machinery systems, both on board in the engine room and at our workshop.
Genuine and OEM spare parts for a wide range of makers. Don't see your engine listed? Our network can source it for you.
04 · Condition monitoring & diagnostic analysis
We measure combustion pressure in every cylinder while the engine is running using a portable combustion pressure analyzer, and combine it with the vessel's operating data to build a complete picture of engine condition. No dismantling, no interruption to operations, and every result is analysed by UMJ engineers with clear recommendations.
Serviceable components are replaced prematurely, wasting spare parts budget and downtime.
Minor wear develops into major damage, leading to off-hire and multiplied repair costs.
When did you last know, with certainty, the combustion condition of every cylinder?
Symptoms such as black smoke, rising fuel consumption and uneven exhaust gas temperatures are often noticed too late.
Advanced diagnostics for higher reliability
Engine monitoring & performance measurement
What you get
Not just "the engine runs fine", but how well each individual cylinder is performing.
Condition-based overhaul planning instead of running hours alone.
Every maintenance expense is backed by inspection findings and recommendations.
Advanced diagnostics
Cylinder pressure shows the symptom. Ultrasound (acoustic emission), read together with pressure, helps identify the root cause. Available as an advanced service on request.
Tells you what is happening. Cylinder pressure curves, Pmax, Pcomp and load balance.
Tells you why it is happening. Acoustic emission analysed alongside pressure for a combined diagnosis.
Sample result · load balance
Load deviation of each cylinder from the engine average (%). Limit ±5%; three cylinders out of range. Taken from an actual measurement, with vessel details withheld.
Service packages
Basic reads combustion condition cylinder by cylinder. Comprehensive extends the analysis to fuel and lube oil efficiency, engine layout and propeller performance.
| SCOPE | BasicCombustion condition | ComprehensiveFull analysis |
|---|---|---|
| Pmax, Pcomp and MIP per cylinder | ✓ | ✓ |
| Indicated power and cylinder load balance | ✓ | ✓ |
| Cylinder pressure curves, p-alpha and bar graphs | ✓ | ✓ |
| Parameter evaluation against maker's reference | — | ✓ |
| Measured SFOC and SLOC against reference | — | ✓ |
| Engine layout: operating point vs propeller curve | — | ✓ |
| Hull/propeller efficiency and CII check | — | ✓ |
| Potential savings (USD/day), CO₂ and SOx emissions | — | ✓ |
Pmax, Pcomp, MIP and indicated power are measured directly by the UMJ team. Additional data such as draught, weather and propeller data deepen the hull/propeller efficiency analysis.
How it works
You receive: a technical report, per-cylinder charts and a prioritised action list.
Engine performance in practice
Next step
See the results first, then decide whether you need the Comprehensive package or periodic monitoring, for example every six months.
Special rate for your first inspection. Contract rates are available for periodic monitoring.
Request a quotation05 · Project gallery
These are not stock photos. Engine models are listed so you can match them against the engines in your own fleet.
06 · Facility
A maintenance and overhaul facility next to the port, cutting mobilisation time for our team and components to and from your vessel.
On board or in the workshop. Every job can be carried out directly on your vessel or at our workshop, and we work around your vessel's schedule. Location: INKOPAU Warehousing Complex, Tanjung Priok, North Jakarta.
07 · Contact
For ongoing requirements, upcoming docking and overhaul plans, or a quotation for an Engine Performance Check, get in touch with our team.
