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INSERT Marine Diesel Engine Spare Parts is a critical core wear-resistant component for marine diesel engines. Made of high-quality heat-resistant and corrosion-resistant materials, it protects the valve seat bore and maintains stable valve sealing during engine operation. It features precise dimensional accuracy, stable structural performance and excellent fatigue resistance, suitable for routine servicing, shipyard overhaul and fault repair under marine harsh working conditions.
A well-matched insert stabilizes engine combustion performance, prevents seal leakage and power reduction, reduces component failure risks and equipment downtime, and ensures efficient and reliable operation of marine diesel engine units.
Please provide equipment model, specifications and part number before ordering to confirm compatibility.
INSERT 23/30 | Marine Auxiliary Engine Replacement Spare Parts
The INSERT 23/30 is a core precision component specially designed for MAN 23/30 series marine auxiliary diesel engines. Installed inside the cylinder head assembly, this insert serves as a critical pressure-bearing and heat-resistant part of the combustion chamber. It withstands high combustion pressure, rapid temperature fluctuation and thermal shock during continuous engine operation, maintaining stable sealing of the combustion zone and protecting surrounding cylinder head base metal from high-temperature ablation and mechanical erosion. Damaged insert will lead to poor combustion, gas leakage, cylinder head cracking risk and power loss. Replacing with standard INSERT 23/30 restores original combustion chamber geometry and ensures reliable continuous running of marine auxiliary generator engines.
Working under harsh marine operating conditions including long-time full-load continuous operation, frequent thermal cycling, high combustion pressure and ship salt-fog corrosion, the insert will gradually produce surface ablation, thermal fatigue cracking and sealing surface wear after long service hours. Failed insert causes blow-by gas leakage, increased fuel consumption and accelerated damage to valve seat, valve and cylinder head. Regular inspection and replacement of insert are essential maintenance items for MAN 23/30 auxiliary engine overhaul and dry-dock repair projects.
This INSERT 23/30 adopts optimized alloy casting structure with excellent thermal conductivity and high-temperature mechanical strength, effectively resisting thermal fatigue cracking under alternating hot-cold cycles. The sealing mating surface is precision machined to achieve tight contact and reliable gas sealing, preventing high-pressure combustion gas leakage. It maintains stable combustion chamber shape without deformation under variable load working conditions.
With outstanding high-temperature corrosion resistance and thermal stability, the insert adapts to frequent start-stop and long-term heavy-load operation of marine generator sets. It effectively reduces combustion gas leakage, abnormal thermal stress and component failure rate, stabilizes engine combustion efficiency, lowers daily maintenance costs and greatly improves the long-cycle operational safety and reliability of MAN 23/30 marine auxiliary diesel engines.
The INSERT 23/30 is manufactured from high-grade heat-resistant alloy, specially customized for the high-temperature and high-pressure working environment of MAN 23/30 four-stroke marine auxiliary engines. Precision casting process eliminates internal porosity and structural defects. Multiple stress relief treatments remove residual casting stress to ensure long-term dimensional stability without deformation. Key sealing surfaces adopt fine machining and surface finishing process to improve high-temperature erosion resistance. The whole manufacturing process strictly complies with MAN OEM technical requirements and universal marine diesel industry standards.
Quantified Marine-Grade Performance Parameters
Parameter | Specification | Test & Implementation Standard |
Core Material | Heat-resistant alloy | Raw material spectrum inspection |
Surface Treatment | Precision machining & surface finishing | Surface finish & flatness inspection |
Dimensional Tolerance | OEM-level precision matching tolerance | CMM full dimensional inspection |
Mechanical Performance | Thermal shock resistant, anti-fatigue, erosion proof | Thermal cycle fatigue test |
Working Temperature Resistance | Adapt to combustion chamber high-temperature environment | High-temperature structural stability test |
Service Feature | Gas-tight sealing, anti-ablation, stable heat transfer | Marine long-cycle operation simulation test |
Compliance Standard | Universal marine industrial manufacturing specifications | MAN OEM & marine diesel industry norms |
All INSERT 23/30 are manufactured strictly in accordance with MAN OEM engineering drawings and marine combustion chamber component standards. Every workpiece undergoes raw material verification, alloy casting, heat treatment calibration, precision machining and surface finishing. Key sealing surfaces and overall geometric tolerance are fully controlled to ensure perfect coordination with cylinder head, valve seat and valve assembly.
Each finished insert passes strict pre-delivery full inspection, including dimensional accuracy detection, hardness testing, surface defect screening and sealing matching test. All technical parameters fully match original equipment standards, supporting direct drop-in replacement without secondary processing, effectively improving auxiliary engine overhaul quality and post-maintenance operational stability.
MAIN ENGINE | MAN B&W | S26MC,L/S35MC,L/S42MC,L/S50MC,L/S60MC,L/S70MC,L/S80MC,L/S90MC,S46MC-C,S50MC-C,S60MC-C,S70MC-C,S80MC-C,S90MC-C,K90MC-C,K98MC-C,K/L45GF(CA),55GF(CA),67GF(CA),80GF(CA),90GF(CA) |
WARTSILA | 6L20,9L20,8L32,R22,R32,L20,L32 | |
PIELSTICK | PC2-2,PC2-5,PC2-5L,PC2-5V,PC2-6,PA4,PA5,PA6 | |
HANSHIN | EL30-44,ELS-35,44,LH-28G,LU24-54,LUN28AR(G),LUS24-58,LF46-58 | |
NIIGATA | 16HS,16X,18CX,19HX,20AX,25BX,25CX,26AFTE,26KGHS,28AFTE,28BX,28KGHS,31EZ,31X,32CLX,34AFTE | |
SULZER | RTA38,RTA48,RTA52,RTA58,RTA62,RTA68,RTA72,RTA76,RTA84,RL(A/B)56,RL(A/B)66,RL(A/B)76, RL(A/B)90,RND68,RND76 | |
AKASAKA | A31,A34,A38,A41,A45,AH25,AH27,AH28,AH30,AH38,AH40,K28,K31,DM28FD,DM38FD,DM40FD,DM51SS | |
MITSUBISHI | UEC33LSE,UEC37LA,UEC45LA,UEC50LS,UEC52LA,UEC52LS,UEC60LS,UET45/75C,UET45/80D, UET52/90D,UET52/105H | |
AUX.ENGINE | MITSUBISHI | S6A,S6B,S6R,S6N,S16N,S16R,S12R,SA2 |
MAN B&W | 16/24,20/27,21/31,23/30,25/33,28/32,32/40,48/60,58/64 | |
YANMAR | HAL,KL,KDL,KFL,RAL,MAL,S165,S185,M200,M220,T220,T240,T260,Z280,N165,N18,N21,N165,N260,N280, N330,NY16,EY18,EY22,EY26,4CHL,6CHL | |
DAIHATSU | DK20,DK26,DK28,DK32,DL16,DL19,DL20,DL22,DL24,DL26,DL28,DL32,DS18,DS19,DS22,DS26,DS28,DS32, DS40,PK14,PK16,PL24,PL26,PS18,PS20,PS22,PS26,PS30 |
We supply full-series matching spare parts for MAN 23/30 auxiliary engine overhaul, including valve seat, valve spindle, valve spring, valve retainer, cylinder head gasket, injector sleeve and complete cylinder head overhaul kits, providing one-stop procurement solutions for shipyards, shipping companies and marine engine maintenance suppliers.
Each batch of INSERT 23/30 undergoes full-process professional inspection and performance screening, including raw material spectrum analysis, metallographic inspection, dimensional calibration, hardness testing, surface defect detection and thermal shock test. All inspection records are archived completely for customer review and dry-dock audit.
Manufactured in strict compliance with universal marine diesel industry norms and MAN OEM technical specifications, this insert meets the requirements of daily vessel navigation and engine overhaul projects, serving as reliable replacement spare parts for marine auxiliary engines.
The insert is a key combustion chamber component of MAN 23/30 auxiliary engine cylinder head system. Long-term high-temperature impact, thermal fatigue and gas erosion will cause surface ablation, microcracks and sealing surface damage. Replace the insert during major overhaul if gas leakage, surface cracking or obvious ablation is detected. Installing new standard INSERT 23/30 restores precise combustion chamber geometry, optimizes combustion efficiency and protects cylinder head and valve components from secondary damage.
Regular inspection of insert surface condition and sealing performance is an essential routine maintenance item for MAN 23/30 marine auxiliary engines. For vessels with long-term continuous power operation, combustion chamber parts are prone to thermal fatigue wear. Timely inspection and replacement can effectively avoid gas leakage, power attenuation and excessive fuel consumption, ensuring stable and safe operation of shipboard power equipment.
Which engine does this insert fit?
This insert is specially customized for MAN 23/30 series marine auxiliary diesel engines, also compatible with multiple mainstream marine main and auxiliary engine models listed above. Please provide complete engine model or original part number for accurate matching confirmation.
What is the delivery time?
Standard INSERT 23/30 are in stock with 7–10 working days fast delivery. Non-standard customized specifications support 7–15 working days production cycle.
Can you provide customized processing services?
Yes, we support OEM customization and non-standard processing according to customer drawings and samples. All customized products undergo full-dimensional inspection and mechanical performance testing before shipment.
What is your warranty policy?
12-month warranty for material and manufacturing defects. We provide professional after-sales technical support including installation guidance and assembly parameter verification.
What is the MOQ and export packaging?
MOQ is 1 unit for in-stock products, with favorable bulk discount for fleet batch orders. Standard export packaging adopts anti-rust oil treatment, moisture-proof wrapping and solid plywood crating, adapting to long-distance ocean transportation and overseas storage.
