4L8120 Gasket for Caterpillar Equipment

4L8120 is a flat gasket used in Caterpillar engine, generator, ship equipment, and exhaust gas cleaning system applications. This is a new aftermarket gasket manufactured by CTP (Costex Tractor Parts).

The gasket is identified by the SKU 4L8120 and is listed for use with the Caterpillar D379, D398, and D399 engine families, including designated industrial, marine, and engine-generator configurations.

Fitment

• Engine and generator kit: D379B, D398B, D399.
• Industrial engines: D379, D379B, D398, D398B, D399, G379, G379A, G398, G399.
• Ship equipment: D379A, D379B, D398A, D398B, D399.
• Exhaust gas cleaning system modernization: SCR.

Fitment is specified for the model and application groups listed above. The available product data does not identify a particular installation position or the individual component assembly in which the gasket is installed.

Cross-reference numbers

• 4L8120 — product SKU.
• 4L-8120 — hyphenated part-number format.

The number formats 4L8120 and 4L-8120 refer to the same gasket identification. No additional supplier or equipment-manufacturer cross-reference numbers are provided in the available data.

Specifications

The listed hole dimensions indicate three holes with a 0.53-inch size and one hole with a 3.62-inch size. Verify the gasket dimensions and hole arrangement against the removed part and the equipment application before installation.