Engine Parts/Long Block

Products & Range Coverage
A&S MACHINERY CO., LTD. delivers an extensive inventory of specialized long blocks within our engine parts catalog to support diverse heavy-duty equipment:
• Machine & Engine Series Compatibility: Engineered for a broad range of Komatsu heavy-duty engines, our assemblies ensure exact mounting dimensions and interface profiles for a 100% perfect match and factory-grade power delivery.
• Complete Long Block Assemblies Composition: 1. Precision Engine Blocks: Premium-grade cast iron blocks subjected to precision CNC boring and pressure testing to ensure zero tolerance error in main bearing housing concentricity; 2. Crankshaft & Bearing Sets: Alloy steel forged crankshafts verified through high-standard dynamic balancing, paired with high-wear-resistant triple-alloy bearing shells; 3. Piston, Ring & Liner Assemblies: Factory-matched pistons and reinforced wet cylinder liners engineered to ensure optimal operating clearances under cold and hot conditions; 4. Cylinder Head Assemblies: Fully integrated assemblies complete with valves, guides, springs, and rocker arm mechanisms, subjected to pre-shipment pressure and airtightness testing.
• OEM & Heavy-Duty Aftermarket: We offer certified original equipment manufacturer Komatsu long blocks alongside rigorous bench-tested aftermarket heavy-duty assemblies, delivering exceptional reliability and extended service lifespan at a cost-effective price point for global clients.

Supply Chain & Logistics
We maintain a robust operational infrastructure designed to support global heavy engine assembly procurement through direct supply channels, delivering reliable stock availability and rapid dispatch to build trust with international equipment owners and repair facilities.
• Massive Inventory and Engine Archival Verification: We maintain large-volume stock of hundreds of differing specifications of Komatsu mainstream heavy-duty excavator and bulldozer engine half-assemblies. Backed by barcode-enabled intelligent warehousing and Komatsu machinery databases, we guarantee precise matching and global direct dispatch upon order confirmation to minimize jobsite downtime caused by major engine overhaul waiting periods.
• Steel-Framed Crated Protection and Vacuum Sealing: We implement specialized industrial packaging standards for heavy precision mechanical assemblies weighing hundreds of kilograms or tons that are vulnerable to collision, tipping, moisture, and handling damage, utilizing fully sealed vapor corrosion inhibitor anti-rust vacuum plastic wrapping to prevent marine salt fog corrosion, high-strength floating shock-absorbing wooden bases, and specialized industrial steel-frame-reinforced fumigated solid wood export heavy-duty crates to ensure components do not suffer structural distortion, tipping impacts, or rust during transcontinental ocean or air transit.
• Consolidated Sourcing: We support overseas clients by consolidating long blocks alongside matching fuel injectors, turbochargers, starters, alternators, and cooling water pumps into precise bundled shipments, achieving a core half-assembly and peripheral accessory one-stop purchasing model that significantly reduces international freight costs for overseas machine maintenance facilities.

Engineering Solutions & Technical Support
Our technical framework focuses on resolving field-level operational challenges to eliminate equipment downtime, moving beyond simple parts distribution to deliver comprehensive engineering and service capabilities for major power assembly replacement assets.
• Application-Specific Durability Solutions: We address common field issues in extreme jobsite environments, such as open-pit quarries involving continuous high-intensity overload operations where original engines suffer multi-cylinder scoring and traditional scattered-parts overhauls fail due to distorted old engine blocks. We also provide professional engineering replacement solutions featuring factory-level high-precision pre-assembly equipped with enhanced anti-cavitation blocks and wear-resistant pistons, eliminating time-consuming field machining procedures.
• Troubleshooting and Maintenance Guidelines: We address common user concerns regarding peripheral accessory contamination and uncleaned fuel or cooling systems causing secondary damage to new assemblies during long block hoisting and replacement by providing professional diagnostic and replacement guidance. This includes emphasizing the mandatory execution of a thorough flush and clean protocol on original engine oil coolers, torque converters, and oil lines prior to installing new half-assemblies to prevent metal debris from old engine bearing failures from remaining in the new system, alongside executing a pre-lube procedure to inject oil into main galleries via manual or external pumps and hand-cranking to verify zero binding before initial ignition to prevent dry-friction bearing melting.
• Expert Technical Support and Safety Guidelines: We provide technical documentation covering Komatsu engine hoisting center-of-gravity guidelines, flywheel and torque converter alignment standards, and break-in period load control specifications, assisting overseas technical personnel in maintaining standardized installations.

Call to Action & User Experience
Optimize your machinery power restoration and heavy-duty operational reliability today by utilizing our interactive tools placed across strategic positions on our platform.
• Multi-Dimensional Intelligent Search and Specification Filtering: Benefit from advanced search functions supporting fast product filtering by Komatsu machine model (such as PC200-8, PC360-7, WA380, or D85), engine platforms (such as 6D102, SAA6D107, or SAA6D125), component categories (such as long blocks, short blocks, or engine cores), or original equipment manufacturer serial numbers to lock onto target products instantly.
• RFQ and Long Block Quotation: Access our fast-response interactive channels providing one-click submission of equipment nameplate photos and half-assembly replacement requirements to receive bundled quotations inclusive of heavy freight ocean transport estimates, fulfilling major breakdown emergency overhaul and power train upgrade procurement requirements for international mining operations, fleets, and repair facilities.
• Consultation and Support: Utilize our around-the-clock professional technical support channels staffed by senior Komatsu machinery engine assembly and overhaul experts to assist overseas clients in verifying compatibility for legacy non-standard interfaces and accessory transplantation issues, ensuring cross-border procurement runs error-free.