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The cylinder head gasket is a multi-layered sealing component positioned between the engine block and cylinder head. As one of the most stressed gaskets in an engine, it plays a vital role in maintaining compression, sealing combustion chambers, and preventing fluid leaks.
Composite Construction:
Steel core for strength and dimensional stability
Elastomer coatings for fluid sealing (coolant/oil passages)
Combustion rings (typically steel or copper) around cylinders
Types:
*MLS (Multi-Layer Steel)*: Most common in modern engines
*Graphite/Composite*: Older engine applications
Copper: High-performance/turbocharged engines
Combustion Seal: Contains 2,000+ psi combustion pressures
Fluid Separation: Prevents oil/coolant mixing while allowing proper circulation
Thermal Management: Accommodates different expansion rates of iron block/aluminum head
Surface Compensation: Bridges microscopic imperfections between mating surfaces
Withstands temperatures from -40°C to 200°C+
Must resist degradation from combustion byproducts
Subject to "fire ring" erosion in high-performance applications
Critical torque sequence during installation
Common failure indicators:
External coolant/oil leaks
White exhaust smoke (coolant burning)
Oil contamination ("milkshake" in crankcase)
Compression loss between cylinders
Proper surface preparation (machining/deburring)
Critical torque sequence and angle tightening
Replacement typically during major engine service
*Laser-Welded Layers* for improved durability
Variable Thickness Designs accommodating block/head distortions
*Sensor-Embedded Gaskets* for condition monitoring (emerging tech)
Modern cylinder head gaskets represent precision engineering that balances sealing performance with material science. Their reliability directly impacts engine efficiency, emissions, and longevity in increasingly demanding operating conditions.
| TOYOTA Series | |||
| Type | Diameter | Original NO. | Sample |
| 1B | Φ100mm | 11115-56060 |  |
| 2B | Φ102mm | 11115-56011 |  |
| 3B | Φ103mm | 11115-58010/13/40 |  |
| 14B | Φ103mm | 11115-58070(metal) |  |
| 15BF-T | Φ109.5mm | 11115-58140(metal) |  |
| 1VZFE | Φ80mm | 11115/6-62050 |  |
| 1VZFE | Φ80mm | 11115/6-62050 |  |
| 1G-GEU | Φ77mm | 11115-70010/20/30 |  |
| 1RZ | Φ89mm | 11115-75010 |  |
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