Head Gasket Seal for Volvo Penta AQ125B, AQ131A-D, AQ145B, AQ151A-C, 230A-B & 250A-B – Replaces 876302, 876022

Product Details

This head gasket seal is designed for specified Volvo Penta marine engines in the AQ125B, AQ131, AQ145, AQ151, 230, and 250 families. It is intended for cylinder-head service where the existing head gasket must be replaced. Confirm the complete engine model and the gasket dimensions or reference number before ordering.

The company catalog identifies this product with Volvo Penta reference numbers 876302 and 876022. Sierra catalog information also lists 18-2813 as a head gasket set that replaces 876302 for four-cylinder applications. Because the company record does not specify an individual package quantity or a complete assortment of additional gaskets, this listing does not promise extra seals, bolts, or a full decarbonizing kit.

• Head gasket seal for selected Volvo Penta marine engines
• For cylinder-head gasket replacement and related service work
• Company-listed references: 876302 and 876022
• Aftermarket catalog cross-reference: Sierra 18-2813 for 876302 applications

Part Number Matrix

Use these references to compare the product with your existing gasket and parts diagram. Part-number references do not replace confirmation of the exact engine model.

Engine & Model Compatibility

The company catalog lists the following Volvo Penta models. Keep the engine family, model suffix, and any serial or production details together when checking fitment.

Technical Specs

Application

Volvo Penta marine cylinder-head gasket replacement

Part Type

Head gasket seal

Company-Listed References

876302 and 876022

Aftermarket Catalog Cross-Reference

Sierra 18-2813 for 876302 four-cylinder applications

Material

Not specified in the company catalog

Package Quantity

Not specified in the company catalog

What's in the Box

• Head gasket seal
• Additional gaskets, seals, bolts, and installation hardware are not specified in the company product record and should not be assumed to be included.

Installation Notes

1. Disconnect the battery and allow the engine to cool completely before beginning work.
2. Drain the cooling system as required and remove components that obstruct access to the cylinder head.
3. Remove the cylinder-head fasteners in the sequence specified by the applicable Volvo Penta service manual.
4. Lift the cylinder head carefully and inspect the head and block mating surfaces for warping, damage, corrosion, or deep scoring.
5. Clean the mating surfaces without gouging the metal. Do not install the new gasket over residue or an uneven surface.
6. Check cylinder-head flatness and have the head inspected or resurfaced if required by the service manual.
7. Position the gasket in the correct orientation with all locating features properly aligned.
8. Reinstall the cylinder head and tighten the fasteners in the specified sequence, stages, and torque values.
9. Use sealant only where explicitly required by the Volvo Penta service documentation.
10. Refill the cooling system, reconnect the battery, start the engine, and check carefully for coolant or oil leaks.

Troubleshooting & FAQ

How do I know if the head gasket needs replacement?

Possible symptoms include unexplained coolant loss, overheating, combustion gases in the cooling system, coolant and oil contamination, white exhaust smoke, rough running, or low compression. These symptoms can have several causes, so diagnose the engine before ordering parts.

Is this a complete decarbonizing gasket kit?

The company record identifies the product as a head gasket seal and does not specify a complete assortment of decarbonizing gaskets. Do not assume that intake, exhaust, cooling-system, or other service gaskets are included.

Which reference numbers should I compare?

The company-listed references are 876302 and 876022. Sierra catalog information lists 18-2813 as replacing 876302 for four-cylinder applications. Verify the reference against your engine parts diagram before ordering.

Does the product fit every AQ131, AQ151, 230, or 250 engine?

The listed models are AQ131A, AQ131B, AQ131C, AQ131D, AQ151A, AQ151B, AQ151C, 230A, 230B, 250A, and 250B, along with AQ125B and AQ145B. Confirm the exact model suffix and any applicable serial or production condition.

Can I reuse the head bolts?

Follow the applicable Volvo Penta service manual. Inspect the fasteners and replace them if the manufacturer specifies replacement or if they are damaged, stretched, corroded, or otherwise outside specification.

Do I need sealant?

Use the installation method specified for your engine and gasket design. Do not apply sealant to the gasket unless the service documentation specifically requires it.

Is this an OEM Volvo Penta part?

This listing is for an aftermarket replacement product. The Volvo Penta numbers shown are reference numbers for identification and fitment comparison, not a claim that the replacement is manufactured by Volvo Penta.

What should I verify before ordering?

Compare your engine's complete model designation, the existing gasket, and the applicable parts diagram. Also confirm whether you need only the head gasket or a separate full gasket set for the planned service.

Safety & Important Info

• Allow the engine to cool completely and follow safe procedures for battery disconnection and coolant handling.
• Use the correct service-manual torque sequence and specifications; incorrect cylinder-head installation can cause engine damage.
• Verify the gasket orientation, engine model, and reference number before installation.
• Professional installation is recommended for cylinder-head service.

About Sea Sierra

• We provide marine replacement parts for repair and maintenance applications.
• Product references and fitment information are presented to help you compare parts with your engine documentation.
• For best results, confirm the exact engine model and parts-diagram reference before ordering.