Sierra 18-1238 Intake Gasket Set, Replaces OMC/Volvo Penta 912979, Mercury Marine 27-824326

The Sierra 18-1238 Intake Gasket Set is a replacement gasket set designed to seal the intake manifold on compatible marine engines, restoring a tight seal where the original gasket has hardened, cracked, or begun to leak. Installed between the intake manifold and the engine block, the gasket set prevents air, fuel, and vacuum leaks that can cause rough idling, power loss, or coolant intrusion if the seal fails. The set is built to meet or exceed the specifications of the original equipment part it replaces, giving installers confidence that fit and sealing performance will match factory expectations. It ships as a single, complete unit (1 count) ready to install during an intake manifold service or full engine rebuild. This gasket set is cross-referenced to several OEM part numbers used across GLM, Evinrude/Johnson, OMC, Mercury Marine, and Volvo Penta engines, making it a straightforward replacement for boat owners and marine mechanics who need to match an existing part number to the correct Sierra equivalent. Because it is sold as a defined set rather than a single gasket, it is intended to cover the full intake sealing job in one purchase rather than requiring multiple individual gaskets to be sourced separately.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1238
• Product Type: Intake Gasket Set
• Color: White
• Unit Count: 1
• Weight: 0.35 pounds
• UPC: 808282239930
• OEM Cross-Reference: GLM 30351, Evinrude/Johnson 912979, OMC 3850379, Mercury Marine 27-824326, Volvo Penta 912979, Volvo Penta 3850379

Fitment

Compatible with engines that originally used GLM, Evinrude/Johnson, OMC, Mercury Marine, or Volvo Penta intake gaskets carrying the OEM numbers listed above. Confirm your existing part number against the Replaces list below before ordering.

Replaces (OEM)

• GLM 30351
• Evinrude/Johnson 912979
• OMC 3850379
• Mercury Marine 27-824326
• Volvo Penta 912979
• Volvo Penta 3850379

Frequently Asked Questions

What does the Sierra 18-1238 Intake Gasket Set include? The Sierra 18-1238 Intake Gasket Set ships as a single complete set (1 count) containing the gaskets needed to reseal the intake manifold in one job, rather than requiring separate individual gasket purchases.

Which OEM part numbers does part 18-1238 replace? Part 18-1238 cross-references to GLM 30351, Evinrude/Johnson 912979, OMC 3850379, Mercury Marine 27-824326, Volvo Penta 912979, and Volvo Penta 3850379.

Is the Sierra 18-1238 gasket set equivalent to the original Mercury Marine 27-824326 part? Yes, Sierra 18-1238 is built to meet or exceed the specifications of the original equipment part it replaces, including Mercury Marine 27-824326.

How much does the 18-1238 Intake Gasket Set weigh? The Sierra 18-1238 Intake Gasket Set weighs 0.35 pounds.

What color is the Sierra 18-1238 gasket set? This gasket set is white.

Can this gasket set be used on engines that originally used an OMC 3850379 gasket? Yes, OMC 3850379 is one of the OEM numbers that the Sierra 18-1238 Intake Gasket Set cross-references and replaces.

Does the same part number work for Volvo Penta engines? Yes, Sierra 18-1238 cross-references to Volvo Penta 912979 and Volvo Penta 3850379, so it is a suitable replacement for engines that used those Volvo Penta gasket numbers.

Is this a genuine Sierra part or an aftermarket copy? The 18-1238 Intake Gasket Set is a genuine Sierra part, manufactured by Sierra and identified under Sierra part number 18-1238.

How many gaskets come in the 18-1238 set? The Sierra 18-1238 is sold as one complete intake gasket set (unit count of 1) rather than as individual gaskets.

What is the UPC for the Sierra 18-1238 Intake Gasket Set? The UPC for this product is 808282239930.

Will this gasket set fit an Evinrude/Johnson engine that used gasket number 912979? Yes, Evinrude/Johnson 912979 is listed as one of the OEM numbers replaced by Sierra 18-1238.

What is the difference between the GLM 30351 gasket and the Sierra 18-1238? GLM 30351 and Sierra 18-1238 are cross-referenced as equivalent parts, meaning Sierra 18-1238 is designed as a direct replacement for the GLM 30351 intake gasket.