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Seal high cylinder pressure with a resilient multi-layer design
Cometic C4285-045 is a three-layer stainless-steel cylinder head gasket for supported Nissan KA24DE applications. Its 90 mm round bore and .045-inch compressed thickness must match the engine build, deck condition, and target compression setup before installation.
Key Features
- Cometic C4285-045 uses three embossed stainless-steel layers for strength, rebound, and corrosion resistance
- Viton-coated outer layers help seal demanding heat, load, and surface-finish conditions
- Uncoated stainless-steel center layer controls the specified compressed thickness
- Designed for aluminum cylinder heads on aluminum or cast-iron blocks
- Dry installation with no added sealant when surfaces meet Cometic requirements
- Manufactured to order by Cometic
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 1991-1998 | Nissan | 240SX | KA24DE engine; 90 mm gasket bore |
| 1998-2004 | Nissan | Frontier | KA24DE engine; 90 mm gasket bore |
| 2000-2004 | Nissan | Xterra | KA24DE engine; 90 mm gasket bore |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | C4285-045 |
| Engine | Nissan KA24DE |
| Material | Multi-layer steel |
| Layers | 3 |
| Compressed Thickness | .045 in / 1.14 mm |
| Bore Size | 90 mm |
| Bore Shape | Round |
| Orientation | None specified |
| Outer-Layer Coating | Viton |
| UPC | 191070037536 |
What's Included
- One Cometic C4285-045 MLS cylinder head gasket
- Cylinder-head bolts or studs, sealant, other engine gaskets, machining, and installation tools are not included
About Cometic Gasket
Cometic designs and manufactures performance sealing products in the United States. Its MLS head gaskets combine embossed stainless-steel layers with application-specific bore geometry, thickness, and coating choices for engines operating across street, competition, and high-output environments.
Related Parts
- KA24DE cylinder-head fasteners selected for the specific engine build
- Compatible intake, exhaust, valve-cover, and timing-cover gaskets
- Machining and surface-finish inspection services for the cylinder head and block
FAQ
What is the C4285-045?It is a three-layer Cometic MLS head gasket with a 90 mm bore and .045-inch compressed thickness for the listed Nissan KA24DE applications.
Which engine does this gasket fit?It is specified for the Nissan KA24DE engine in the vehicle applications shown in the Fitment table.
Is this the 91 mm bore version?No. This listing is specifically the 90 mm bore configuration.
How thick is the gasket after compression?The manufacturer specifies a compressed thickness of .045 inch, or approximately 1.14 mm.
Does it require additional sealant?No. Cometic recommends a dry installation when mating surfaces meet the required flatness and finish.
Are head studs or bolts included?No. Cylinder-head fasteners must be selected separately for the exact engine build.
Can it be installed on an unprepared deck surface?No. Both sealing surfaces must be clean, flat, and finished to the specification required for MLS gasket service.
Is professional engine assembly recommended?Yes. Bore selection, surface preparation, fastener choice, torque procedure, and compression calculations should be verified by a qualified engine builder.
Installation Instructions
- Confirm the engine is a supported KA24DE application and the package identifies Cometic C4285-045.
- Measure the cylinder bore, piston clearance, deck flatness, and surface finish before assembly.
- Clean and dry the block and cylinder-head surfaces; do not apply additional sealant.
- Position the gasket without forcing or modifying coolant, oil, or fastener openings.
- Install verified compatible fasteners and follow the fastener manufacturer's sequence, lubricant, torque, and re-torque requirements.
- After heat cycling, inspect the cooling system and engine for pressure loss, fluid contamination, or leaks.
California Proposition 65 Warning: Cancer and reproductive harm. See www.P65Warnings.ca.gov.
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