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Crank Pin Bearing is a key marine engine spare part installed between the connecting rod and the crankshaft crank pin. It supports the connecting rod, reduces friction, and helps maintain stable engine performance. It works with lubricating oil to create a protective film between moving surfaces, minimizing direct metal contact and wear during operation.
With reliable precision and durable performance, this bearing is suitable for marine engine maintenance and replacement applications. It helps improve connecting rod movement stability, protect the crank pin surface, and support long-term engine operation under demanding working conditions.
HY MARINE crank pin bearing is a core load-bearing precision sliding bearing designed for marine diesel engine crankshaft connecting rod systems. Manufactured from high-strength bimetallic alloy steel and adopting advanced thin-wall precision casting technology, the bearing undergoes vacuum annealing, surface alloy carburizing and anti-fatigue strengthening treatment. It is specially adapted to extreme marine operating conditions including long-term high-load rotation, alternating impact load, engine high-frequency vibration and harsh salt spray humid environment. This crank pin bearing features ultra-high load capacity, low friction coefficient, excellent anti-seizure performance and outstanding fatigue resistance. It effectively solves common engine faults such as bearing ablation, bush burning, crankshaft wear, abnormal knocking and power attenuation caused by long-term operation. Serving as a standard OEM replacement part for ship engine overhaul and routine maintenance, it stabilizes crankshaft system operation, extends engine service life and greatly reduces vessel downtime and daily maintenance costs.
All data below is obtained from standardized factory testing under simulated marine high-load, high-speed and variable-impact operating conditions.
Parameter | Details |
Base material | Marine-grade bimetallic alloy steel (steel back + aluminum-tin alloy layer) |
Forming process | Integral thin-wall precision casting, synchronous finish machining |
Core component treatment | Vacuum annealing, surface carburizing hardening, anti-fatigue treatment |
Impact load resistance improvement | 56% higher than standard marine crank pin bearings |
Wear & fatigue resistance improvement | 53% higher than ordinary engine bearings |
Continuous operation life | 12,000+ hours under marine variable load conditions |
Matching dimensional tolerance | Within 0.008mm |
Batch qualification rate | 99.7% |
Field operation failure rate | Below 0.3% |
Certification | CCS Type Approval Certificate |
Custom production cycle | 7-15 working days |
All marine crank pin bearings adopt 5-axis CNC ultra-precision finishing and micro-gap calibration technology. The wall thickness uniformity, inner diameter roundness and surface flatness fully comply with OEM original engine assembly standards. The bimetallic composite structure ensures perfect fit with crank pin shafts and connecting rods, maintaining stable lubrication film thickness under high-speed rotation and alternating impact loads. High-precision machining eliminates friction deviation and dry friction risks, effectively reducing engine mechanical loss, abnormal vibration and noise. It avoids core failures such as bearing bush ablation, shaft biting and crankshaft scuffing during long-distance ocean voyages, ensuring long-term stable and efficient operation of the engine crankshaft linkage system.
Every batch of crank pin bearings completes strict full-process pre-delivery testing, including raw material alloy composition detection, high-load impact fatigue test, high-temperature lubrication durability test, surface hardness detection and full-size dimensional calibration. Complete official factory test reports, dimensional inspection datasheets and performance test records are provided with each order. Ship maintenance teams can conduct direct installation and commissioning without secondary performance testing, saving inspection labor costs and shortening engine overhaul and commissioning cycles.
All marine crank pin bearings are equipped with valid CCS Type Approval Certificate, fully complying with international marine industry technical specifications and ship inspection standards. Both in-stock standard models and customized products adopt unified marine-grade quality control standards, fully meeting global vessel annual inspection, class audit and port clearance requirements.
This crank pin bearing is widely applicable to mainstream marine main and auxiliary diesel engines, including WARTSILA, MAN B&W, YANMAR, DAIHATSU, NIIGATA, SULZER and HANSHIN series models. It is suitable for new ship construction OEM supporting assembly and old ship engine overhaul, crankshaft system maintenance and wearing part replacement. Adaptable to coastal, offshore and ocean-going harsh working conditions, it covers container ships, oil tankers, bulk carriers, harbor tugs and offshore platform supply vessels. It effectively solves crankshaft system failures caused by bearing aging and wear, reduces vessel standby downtime, and guarantees stable power output of marine diesel engines.
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 |
Our marine crank pin bearings adopt high-quality marine-grade bimetallic composite material, with high-strength alloy steel back for structural support and high-performance aluminum-tin alloy friction layer. Through vacuum annealing and surface hardening treatment, the product features ultra-high load resistance, wear resistance and anti-fatigue performance, perfectly adapting to long-term high-impact and high-vibration operation of marine engine crankshaft systems.
Our crank pin bearings support full-series matching of mainstream marine main and auxiliary engines, including Wartsila, MAN B&W, Yanmar, Daihatsu, Niigata and other common ship engine models. All dimensions and assembly parameters comply with OEM original standards, enabling direct replacement and installation without modification.
All our marine crank pin bearings are equipped with valid CCS Type Approval Certificate, in full compliance with international marine industry specifications and ship inspection rules. The products can smoothly pass vessel annual inspection, port inspection and ship class audit without any compliance risks.
Standard in-stock crank pin bearings can be shipped within 7–10 working days after payment confirmation. For non-standard size and customized processed products, the production cycle is 7–15 working days, with stable quality and controllable delivery progress.
Yes. Every batch of crank pin bearings is delivered with complete factory official documents, including raw material alloy inspection reports, dimensional full-inspection records, high-load fatigue test data and high-temperature durability test reports. Customers can install and commission directly without secondary performance testing to save maintenance time and costs.
Under standard marine variable load and alternating impact working conditions, the continuous stable service life of the bearing reaches 12,000+ hours. The batch qualification rate is as high as 99.7%, and the field operation failure rate is controlled below 0.3%. It effectively avoids common faults such as bearing ablation, shaft biting, engine knocking and power drop, reducing long-term ship operation and maintenance costs.
