Caterpillar C15 Cylinder Liner 

Core OEM Part Numbers: 1599778, 197-9322, 197-9330, 469-5315, 586-3377 | Liner Type: Wet-type, replaceable cylinder liner (with optional crevice seal design for ACERT™ models) | Engine Compatibility: Cat C15 & C15 ACERT inline 6-cylinder heavy-duty diesel engines | Primary Applications: On-highway trucks, construction equipment, mining machinery, marine propulsion, and prime/standby generator sets

Product Overview

The Cat C15 cylinder liner is the critical wear surface and combustion chamber boundary engineered for the extreme thermal, mechanical, and chemical loads of C15 diesel engines. As a wet-type design, it uses engine coolant for direct temperature regulation, ensuring consistent piston ring sealing and minimal bore distortion. The OEM liners feature precision honing, heat-treated alloy cast iron construction, and optimized sealing systems—including advanced crevice seals for ACERT engines—to eliminate coolant/fuel/oil cross-contamination, reduce liner movement, and extend service life in high-load operations. It is fully compatible with Cat genuine pistons, rings, and gaskets, and validated through millions of hours of field testing across global extreme environments.

Core Design & Engineering Features

Material & Heat Treatment

• Base Material: Premium high-nickel-chromium alloyed gray iron (Grade GJL-250 modified) with a pearlitic matrix for superior strength, wear resistance, and thermal conductivity
• Surface Enhancement: Induction-hardened bore surface (hardness 500–550 HB) and micro-grooved cross-hatch honing pattern (30–40° angle) for rapid piston ring seating, optimized oil retention, and reduced friction
• Flange Design: Roll-polished flange radius for increased fatigue resistance and prevention of cracking under cyclic loading
• Crevice Seal Option (ACERT): Extra-wide rectangular crevice seal in addition to dual O-rings (for part 1599778) to minimize liner shift, eliminate combustion gas blow-by into the coolant jacket, and prevent piston scuffing in high-BMEP applications

Sealing & Cooling System

• Dual O-Ring Seals: High-temperature, nitrile rubber (NBR) or fluorocarbon (FKM) O-rings (top & bottom) with interference fit to stop coolant leakage; compatible with extended-life coolants (ELC)
• Wet Liner Configuration: Full circumferential coolant contact for uniform heat dissipation, reducing peak combustion temperatures by up to 20°C compared to dry liners
• Precision Clearances: Tightly controlled bore diameter (137.000–137.224 mm range for standard/0.025/0.050 oversized) and flange height tolerance (±0.02 mm) to ensure consistent liner protrusion (critical for head gasket sealing)

Dimensional Consistency & Durability

• ISO 9001/TS 16949 Certified Manufacturing: 100% dimensional inspection (coordinate measuring machine, air gauge) and pressure testing (20 bar coolant pressure, 30 bar combustion pressure) before shipment
• Resistance to Corrosion: Nitrided external surface to prevent electrolytic corrosion in the coolant jacket; compatible with Cat ELC and standard ethylene glycol coolants
• Vibration & Fatigue Testing: Validated to 50g peak acceleration (per ISO 16750-3) and 10,000+ hour endurance runs in desert, arctic, and marine salt-spray conditions

Technical Specifications

Parameter	Standard Value	Notes
OEM Part Numbers	1599778 (ACERT crevice seal), 197-9322, 197-9330, 469-5315, 586-3377	Standard, oversize, and reman variants available
Bore Diameter (Standard)	137.000 mm (5.394 in)	Oversizes: 137.025, 137.050, 137.100, 137.224 mm
Liner Type	Wet, replaceable cylinder liner	C15 engine standard
Material	Alloyed gray iron with induction-hardened bore	Hardness 500–550 HB
Honing Cross-Hatch	30–40° angle, Ra 0.4–0.6 μm	Optimized for ring seating
Sealing System	Dual O-rings (standard); Crevice seal+O-rings (ACERT 1599778)	FKM/NBR seals for temperature/fuel resistance
Liner Protrusion (Recommended)	0.076–0.102 mm (0.003–0.004 in)	Critical for head gasket integrity
Operating Temperature Range	-40°C to 125°C (-40°F to 257°F)	For coolant and cylinder wall
Net Weight (per liner)	7.8 kg (17.2 lb)	Including seals

Performance & Service Life Benefits

• Piston Ring Seating: Micro-honed surface allows rings to seat within 50 hours of operation, reducing oil consumption by 15–20% vs. non-OEM liners
• Thermal Stability: Uniform wall thickness (7.5 mm nominal) and wet cooling prevent hot spots, lowering exhaust emissions and extending piston/ring life
• Wear Resistance: Induction-hardened surface withstands abrasive particles from low-quality fuel, delivering up to 2x longer service life than aftermarket liners
• No Cross-Contamination: Advanced sealing systems eliminate coolant mixing with engine oil, preventing bearing damage and oil degradation

Application Compatibility

Primary Equipment

1. On-Highway: Class 8 heavy trucks (Peterbilt, Kenworth, Freightliner) with C15 ACERT
2. Construction: Excavators (345C/D, 349D), wheel loaders (980H), motor graders (140M), and scrapers
3. Mining: Underground haulers, surface loaders, and stationary compressors/pumps
4. Marine: Tugboats, workboats, and auxiliary generator sets
5. Power Generation: 300–500 KVA prime/standby gensets

Engine Serial Prefix Compatibility

Valid for C15 serial prefixes: MBN, MBP, MCR, MEP, MSX, NXS, RKS, TBN, W0L (confirm exact part number via Cat Parts Catalog with your engine’s full serial number)

Quality & Testing

• Cat OEM Production: Manufactured in ISO 9001 facilities with full traceability of raw materials and heat treatment processes
• 100% Factory Testing: Each liner undergoes pressure leak testing, dimensional inspection, and surface hardness verification
• Cat Reman Options: Remanufactured liners meet original performance specs, come with a 12-month warranty, and support sustainability goals
• Warranty: Standard 12-month/2000-hour warranty for new OEM liners; extended coverage available through Cat dealers

Installation & Maintenance Guidelines

1. Pre-Installation:
   • Verify liner part number and size match engine serial number and piston/ring set
   • Clean the cylinder block bore thoroughly; inspect for corrosion, nicks, or wear
   • Check liner protrusion gauge and replace O-rings with genuine Cat parts (never reuse old seals)
2. Installation:
   • Lubricate O-rings with clean engine oil or coolant before fitting
   • Press liner into block using a dedicated tool to avoid flange damage
   • Measure liner protrusion (target 0.076–0.102 mm) and adjust if necessary; uneven protrusion will cause head gasket failure
   • Torque cylinder head bolts to Cat’s specified sequence and value (step-torque process)
3. Maintenance:
   • Use only Cat-approved extended-life coolant (ELC) with proper additive package to prevent liner pitting
   • Replace coolant filters per schedule; test coolant for pH and nitrite levels regularly
   • Inspect liners during engine overhaul for scoring, honing wear, or O-ring groove damage

Why Choose Cat Genuine C15 Liners?

• Perfect Fit & Compatibility: Engineered specifically for C15 engines—no modifications needed
• Durability: Induction-hardened surface and alloyed cast iron construction resist wear and thermal fatigue
• Performance: Optimized cross-hatch honing ensures fast ring seating and minimal oil consumption
• Global Support: Backed by the Cat dealer network for technical support, replacement parts, and warranty service
• Lower Total Cost of Ownership: Reduced downtime, fewer repairs, and longer service intervals compared to non-OEM alternatives