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Guide bush is a critical core positioning and wear-resistant guiding component for marine engines and pumps. Made of high-quality wear-resistant and corrosion-resistant materials, it ensures precise axial movement of matching shafts and plungers, reducing friction and preventing eccentric abrasion. 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 guide bush stabilizes equipment operation, reduces shaft wear and seizure risk, cuts component failure risks and equipment downtime, and ensures efficient and reliable operation of marine engine and pump units.
Please provide equipment model, specifications and part number before ordering to confirm compatibility.
28AFTE Engine Guide Bush | Marine Ship Spare Parts
The 28AFTE Engine Guide Bush is a high-precision core guiding component specially designed for NIIGATA 28AFTE series marine diesel engines. Installed in the engine valve train and reciprocating motion assembly, this guide bush provides accurate linear guidance for moving parts, effectively controlling radial runout and lateral displacement during high-frequency reciprocating operation. It maintains precise assembly clearance and motion stability, reduces friction wear, and ensures synchronous and stable operation of valve spindle and matching moving components. Worn, deformed or clearance-overrun guide bush will cause valve jitter, abnormal noise, uneven wear and even valve train stuck failure. Replacing with standard 28AFTE Engine Guide Bush restores original guidance accuracy and guarantees long-term stable operation of marine ship diesel engines.
Working under harsh marine operating conditions including long-time full-load continuous navigation, high-frequency cyclic reciprocating motion, cabin high temperature and salt-fog corrosion, the guide bush will gradually produce inner bore wear, surface scratch, clearance enlargement and precision attenuation after thousands of operating hours. Failed guide bush leads to reduced engine ventilation efficiency, increased mechanical loss and accelerated damage to valve spindle, tappet and related accessories. Regular inspection and replacement of engine guide bush are essential routine maintenance and dry-dock overhaul items for NIIGATA 28AFTE marine engines.
This dedicated 28AFTE guide bush adopts optimized high-density alloy structure with uniform internal texture and excellent mechanical stability. The inner hole is processed by ultra-precision honing technology to form a smooth friction surface, achieving ultra-low friction coefficient and outstanding wear resistance. It can maintain consistent guiding precision and stable clearance matching under long-term high-frequency reciprocating load, effectively avoiding motion jitter and component offset.
With excellent high-temperature dimensional stability and marine corrosion resistance, the guide bush adapts to complex and variable ship operating conditions including frequent start-stop, variable load operation and humid salt-fog environment. It effectively reduces mechanical failure rate of engine motion assembly, lowers daily maintenance and replacement costs, and greatly improves the operational safety, stability and service cycle of NIIGATA 28AFTE marine diesel engines.
The 28AFTE Engine Guide Bush is manufactured from premium high-wear-resistant alloy material, specially customized for the high-frequency friction and high-temperature working environment of NIIGATA 28AFTE marine engines. Integral forming process eliminates internal porosity and structural defects. Multiple stress relief treatments remove residual machining stress to ensure no deformation during long-term service. Key inner guiding bore adopts precision fine boring and ultra-fine honing treatment to strictly control surface roughness and matching tolerance. The whole production process fully complies with NIIGATA OEM technical standards and universal marine diesel industry manufacturing specifications.
Quantified Marine-Grade Performance Parameters
Parameter | Specification | Test & Implementation Standard |
Core Material | High wear-resistant alloy | Raw material spectrum component inspection |
Surface Treatment | Precision honing & finishing | Surface roughness & smoothness inspection |
Dimensional Tolerance | OEM-level precision matching tolerance | CMM full-dimensional precision detection |
Mechanical Performance | Low friction, anti-wear, high rigidity | Friction wear & rigidity test |
Working Stability | High-temperature resistant, deformation-proof | High-temperature dimensional stability test |
Service Feature | Precision guidance, long service life | Marine long-cycle friction simulation test |
Compliance Standard | Universal marine industrial manufacturing specifications | NIIGATA OEM & marine diesel industry norms |
All 28AFTE Engine Guide Bushes are manufactured strictly in accordance with NIIGATA OEM engineering drawings and marine engine precision fitting component standards. Every finished bush undergoes raw material verification, precision machining, heat treatment calibration and inner hole honing finishing. Key matching dimensions, roundness and surface flatness are fully controlled to ensure perfect clearance coordination with valve spindle and moving parts.
Each guide bush passes strict pre-delivery full inspection, including full dimensional calibration, surface defect screening, roughness testing and assembly matching test. All technical parameters completely match original equipment standards, supporting direct drop-in replacement without secondary processing, effectively improving engine overhaul accuracy 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 NIIGATA 28AFTE engine overhaul, including valve spindle, valve guide, valve seat, valve spring, tappet, push rod and complete valve train overhaul kits, providing one-stop procurement solutions for shipyards, shipping companies and marine engine maintenance suppliers.
Each batch of 28AFTE Engine Guide Bushes undergoes full-process professional inspection and performance screening, including raw material spectrum analysis, metallographic structure detection, full dimensional calibration, hardness testing and surface defect inspection. All inspection data and test records are completely archived for customer review and ship dry-dock overhaul audit.
Manufactured in strict compliance with universal marine diesel industry norms and NIIGATA OEM technical specifications, this guide bush fully meets the operational demands of daily ship navigation and engine overhaul projects, serving as high-quality matching replacement parts for marine ship diesel engines.
The guide bush is a core precision guiding component of NIIGATA 28AFTE engine valve train system. Long-term high-frequency reciprocating friction, high-temperature aging and marine salt-fog corrosion will cause inner bore wear, precision loss and excessive matching clearance. Replace the guide bush during major overhaul if surface scratch, loose matching or obvious precision attenuation is detected. Installing new standard 28AFTE Engine Guide Bush restores accurate motion guiding clearance, optimizes valve train operation stability and protects valve and linkage components from secondary wear damage.
Regular inspection of guide bush inner bore wear and matching clearance is an essential dry-dock maintenance work for NIIGATA 28AFTE marine engines. Long-term continuous operation will accumulate friction fatigue and precision loss for guiding parts. Timely inspection and replacement can effectively avoid valve jitter, abnormal engine vibration and power attenuation, eliminating hidden operational risks and ensuring stable and safe operation of ship main power equipment.
Which engine does this guide bush fit?
This engine guide bush is specially customized for NIIGATA 28AFTE series marine ship 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 28AFTE Engine Guide Bushes 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 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.
