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Lower Engine Gasket Set Complete Bottom End Overhaul Seal Kit
Product Overview
Our Cum mins NT855 STC Lower Engine Gasket Set is a heavy-duty bottom-end sealing solution professionally optimized for Cum mins NT855 STC, NTA855 STC and Big Cam STC 14L diesel engines. This all-inclusive bottom end overhaul kit covers all full-range sealing gaskets, high-pressure oil seals, O-rings and buffer cushions required for crankcase service, oil pan replacement, crankshaft seal renewal and complete lower engine in-frame repair. Exclusively designed for STC step timing control engine structural characteristics, it thoroughly solves stubborn bottom-end faults that frequently occur on NT855 STC heavy-duty engines, including crankshaft front/rear oil leakage, oil pan seepage, gear chamber oil spilling and lower cooling system coolant seepage. Adopting upgraded oil-corrosion resistant, pressure-resistant and anti-fatigue composite materials, this NT855 STC lower gasket set features outstanding structural stability and compression recovery, perfectly adapting to long-term heavy-load, high-vibration and high-temperature working environments, effectively eliminating recurring bottom-end sealing failures and maintaining stable internal lubrication pressure.
Compatible Engine & Equipment Applications
This NT855 STC bottom end gasket set adheres to strict OEM dimensional tolerance standards, achieving 100% precise direct fit for all Cum mins NT855 STC, NTA855 STC and Big Cam STC series diesel engines. It is a dedicated STC-version repair kit and not interchangeable with ordinary non-STC NT855 or Big Cam I/II/III/IV engines, widely serving global heavy-duty industrial and commercial equipment:
Heavy-Duty Construction Machinery: Large loaders, motor graders, mining bulldozers, off-road dump trucks and engineering construction equipment powered by NT855 STC engines
Class 8 Heavy-Duty Trucks: Long-haul semi-trucks and heavy cargo transport vehicles equipped with STC timing control powertrain
Industrial Power Generation Units: Stationary diesel generator sets, emergency power supply equipment and continuous-operation industrial power systems
Marine & Special Heavy Machinery: Commercial marine auxiliary diesel engines and large agricultural heavy machinery with NT855 STC powertrain
Official OEM Part Numbers
Item
OEM Part Number
Complete STC Lower Gasket Set
4915303 / 3801331
Alternative STC Bottom Overhaul Kit
3803983 / 4024880
Crankshaft Oil Seal & Lower Seal Kit
3020186 / 3802242
Kit Components List
This Cum mins NT855 STC lower gasket kit contains 100% complete STC-specialized bottom-end sealing accessories for full lower engine overhaul. All parts are customized for STC engine bottom-end structure, no missing components or extra accessories required for standard professional repair:
Heavy-duty reinforced oil pan gasket with excellent vibration resistance and compression recovery
High-pressure resistant crankshaft front & rear oil seals, anti-wear and anti-leakage for long-term operation
Gear chamber cover gasket and timing system bottom-end sealing components exclusive for STC engines
Lower engine cooling system gaskets and water passage sealing rings
Lifter housing bottom gaskets and lower manifold auxiliary sealing cushions
Full set of anti-aging rubber O-rings, sealing washers and buffer gaskets
All matched bottom-end paper gaskets and precision sealing accessories for STC version
Key Features & Advantages
Exclusive STC Version Precise Fit: This lower gasket set is professionally customized for the unique bottom-end structure of Cum mins NT855 STC step timing control engines. All sizes and installation positions strictly match STC engine parameters, supporting direct bolt-on installation without cutting or modification, completely solving the problem of ordinary non-STC gaskets failing to assemble or leak after installation.
Superior High Oil Pressure & Anti-Leakage Performance: Optimized for NT855 high-torque heavy-duty engines, all sealing parts adopt upgraded thickened oil-resistant composite materials. It stably withstands long-term high lubricating oil pressure and strong engine vibration, fundamentally eliminating common stubborn faults such as crankshaft seal oil leakage and oil pan seepage that plague old gaskets.
Excellent Anti-Aging & Deformation Resistance: All bottom-end gaskets and oil seals feature outstanding high-temperature resistance, oil corrosion resistance and fatigue resistance. They avoid permanent deformation, hardening and seal failure caused by long-hour heavy-load operation, maintaining lasting bottom-end sealing tightness and greatly extending service life.
One-Time Complete Bottom-End Fault Repair: This all-inclusive STC lower gasket kit fully covers all lower engine sealing points. It thoroughly repairs typical STC engine bottom-end problems including lubrication system oil leakage, gear chamber oil spilling, lower coolant seepage and unstable crankcase pressure, realizing one-time thorough overhaul effect.
High Cost-Effectiveness & Downtime Reduction: Effectively avoids recurring bottom-end leakage failures and repeated disassembly maintenance. It reduces engine oil consumption, maintenance costs and equipment downtime loss, perfectly restoring the lubrication system tightness and operational stability of NT855 STC heavy-duty equipment.
Important Compatibility Notes
This Cum mins NT855 STC lower engine gasket set is exclusively designed for NT855 STC, NTA855 STC and Big Cam STC series diesel engines. Due to the unique structural design of STC timing mechanism and bottom-end assembly, it is not interchangeable with ordinary non-STC NT855, Big Cam I/II/III/IV and other Cum mins engine models. Please confirm your engine is STC version before ordering to avoid installation mismatch and mechanical failure.
Frequently Asked Questions (FAQ)
Q1: What engines does this NT855 STC lower gasket set fit?
A: This bottom end gasket set is dedicated to Cum mins NT855 STC, NTA855 STC and Big Cam STC 14L diesel engines. It cannot be used for non-STC NT855, Big Cam series or other Cum mins engine models due to different bottom-end structural parameters.
Q2: What core problems can this STC lower gasket kit solve?
A: It permanently fixes common STC engine bottom-end failures, including crankshaft front/rear oil leakage, oil pan seepage, gear chamber oil spilling, lower engine coolant seepage and crankcase pressure instability caused by aging or deformed original gaskets.
Q3: Does this kit include all parts for full STC bottom-end overhaul?
A: Yes. This is a complete STC-version lower overhaul gasket set, including oil pan gasket, crankshaft oil seals, gear cover gaskets, cooling system seals and all auxiliary rubber & paper sealing parts. No extra parts are needed for standard lower engine repair.
A: STC engines have exclusive bottom-end assembly and positioning structures. Ordinary non-STC gaskets have mismatched sizes and lack dedicated sealing parts, which are prone to poor fitting, gaps and repeated leakage. Only STC dedicated gaskets ensure perfect assembly and long-term stable sealing.
Q5: What material advantages does this upgraded lower gasket set have?
A: Adopting upgraded oil-resistant, high-temperature resistant and anti-fatigue composite materials, this gasket set features strong compression recovery and vibration resistance. It resists oil corrosion and aging under long-term heavy-load operation, effectively avoiding deformation and leakage failure with longer service life than ordinary gaskets.
Q6: Is direct installation available for this gasket kit?
A: Absolutely. All components are manufactured strictly according to OEM original factory standards with precise tolerance. It supports direct bolt-on installation without cutting, grinding or modification, ensuring zero assembly gap and perfect tight fit for stock STC engines.
Warranty & Service
Cum mins NT855 STC lower gasket sets. Every kit undergoes strict multi-process factory inspection on material toughness, pressure resistance, anti-aging performance and dimensional accuracy, providing reliable and long-lasting bottom-end sealing protection for heavy-duty construction machinery, commercial trucks and industrial power generation units.
Company Details
Bronze Gleitlager
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and
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from Quality China Factory
Ecer Certification：
Verified Supplier
Guangzhou Tianhe District Qianjin Yiling Machinery Parts Business Department, established in 2013, is a professional supplier focusing on high-performance engine repair kits and cylinder gaskets for construction machinery excavators, boasting solid capabilities in both standard product supply and cu... Guangzhou Tianhe District Qianjin Yiling Machinery Parts Business Department, established in 2013, is a professional supplier focusing on high-performance engine repair kits and cylinder gaskets for construction machinery excavators, boasting solid capabilities in both standard product supply and cu...
