Head Gasket Set Decarbonizing Kit – Fits Volvo Penta AQ115A AQ130A AQ130C MB20B (Replaces 876356, 875401)

Product Details

This Head Gasket Set Decarbonizing Kit is designed for Volvo Penta petrol marine engines, specifically the AQ115A, AQ130A, AQ130C, and MB20B models. Engineered to deliver a reliable seal during engine overhaul or decarbonizing service, this aftermarket kit ensures proper compression and cooling system integrity for your Volvo Penta powerplant.

This kit directly replaces Volvo Penta part numbers 876356 and 875401, as well as Crom Marine 121041.

• Essential gasket set for decarbonizing and head service procedures
• Compatible with Volvo Penta petrol marine engines
• Includes all necessary components for a complete head gasket replacement

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Application

Head gasket decarbonizing kit

Engine Type

Petrol marine engines

OEM Reference

876356, 875401

Material

OEM-spec composite gasket materials

What's in the Box

• 1 × Head Gasket Decarbonizing Kit

Installation Notes

1. Disconnect battery and allow engine to cool completely before beginning work.
2. Remove valve cover, intake manifold, and exhaust manifold as required for access to cylinder head bolts.
3. Loosen cylinder head bolts in the reverse order of the tightening sequence specified in your service manual.
4. Carefully lift cylinder head and inspect mating surfaces for warping or damage.
5. Thoroughly clean all gasket surfaces on both the head and block, removing all old gasket material and carbon deposits.
6. Position the new head gasket on the engine block, ensuring all dowel pins and alignment features are properly seated.
7. Place the cylinder head onto the block, aligning bolt holes and dowel pins.
8. Install cylinder head bolts hand-tight, then torque to specification in the proper sequence using a calibrated torque wrench.
9. Reinstall exhaust manifold, intake manifold, and valve cover with new gaskets where applicable.
10. Reconnect battery, refill coolant, and check for leaks before starting the engine.
11. Run engine to operating temperature and recheck torque on head bolts after initial heat cycle if specified by manufacturer.

Troubleshooting & FAQ

How do I know if my head gasket needs replacement?

Common signs include white smoke from exhaust, coolant loss with no visible leaks, engine overheating, milky oil or coolant contamination, and loss of compression. If you notice any of these symptoms, inspect the head gasket and replace as needed.

What's included in a decarbonizing kit versus a standard head gasket?

A decarbonizing kit typically includes the head gasket plus additional seals and gaskets needed during a full head removal and cleaning service. This comprehensive approach ensures all critical sealing surfaces are refreshed during engine maintenance.

Do I need to resurface the cylinder head when replacing the gasket?

Inspect the head for warping using a precision straight edge and feeler gauge. If warpage exceeds manufacturer specifications, the head must be resurfaced by a qualified machine shop before installing the new gasket.

Can I reuse cylinder head bolts?

Consult your engine service manual—many Volvo Penta engines use torque-to-yield bolts that must be replaced. Reusing stretched bolts can result in improper clamping force and gasket failure.

What torque sequence and specifications should I use?

Always follow the torque sequence and values specified in the Volvo Penta service manual for your specific engine model. Incorrect torque or sequence can cause gasket failure and engine damage.

How long does a head gasket replacement take?

For an experienced technician, a head gasket replacement on these Volvo Penta engines typically takes 4–8 hours depending on accessibility and whether additional decarbonizing or machine work is required.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.