Carburetor Rebuild Kit – Fits Volvo Penta 3.0L 4-Cylinder Engines (Replaces 21533394)

$69.95 $111.00

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Carburetor Rebuild Kit – Fits Volvo Penta 3.0L 4-Cylinder Engines (Replaces 21533394) is backordered and will ship as soon as it is back in stock.

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Product Details

This comprehensive Carburetor Rebuild Kit is designed for Volvo Penta 3.0L 4-cylinder gasoline engines within the GL, GS, GSM, and GSP series. It provides the essential components to restore your Holley 2300 Marine 2-barrel carburetor to optimal performance and efficiency.

This kit serves as a direct aftermarket replacement for multiple OEM and aftermarket part numbers, including Volvo Penta 21533394 / 3854256, OMC 987485 / 0987485, Sierra 18-7246, and Mercury/MerCruiser 802523.

Designed for do-it-yourself installation using basic hand tools.
Specifically for Holley 2-barrel marine carburetor applications.
Restores engine performance, fuel efficiency, and reliability.

Part Number Matrix

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

Brand	Part Number
Volvo Penta	21533394
Volvo Penta	3854256
OMC	987485
OMC	0987485
Sierra	18-7246
Mercury/MerCruiser	802523

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Volvo Penta: Compatible with various 3.0L 4-cylinder 2-stroke gasoline engines from the GL, GS, GSM, and GSP series.

MerCruiser / OMC: Fits specified 3.0L 2-stroke engine models utilizing a Holley 2-barrel carburetor.

Brand	Model	Stroke	OEM Part No.
Volvo Penta	3.0GSP-A	2-Stroke	21533394
Volvo Penta	3.0GSP-B	2-Stroke	21533394
Volvo Penta	3.0GSP-C	2-Stroke	21533394
Volvo Penta	3.0GSM-A	2-Stroke	21533394
Volvo Penta	3.0GSM-B	2-Stroke	21533394
Volvo Penta	3.0GSM-C	2-Stroke	21533394
Volvo Penta	3.0GLP-A	2-Stroke	21533394
Volvo Penta	3.0GLM-A	2-Stroke	21533394
Volvo Penta	3.0GLM-C	2-Stroke	21533394
Volvo Penta	3.0GLP-C	2-Stroke	21533394
Volvo Penta	3.0GLP-D	2-Stroke	21533394
Volvo Penta	3.0GLP-E	2-Stroke	21533394
Volvo Penta	3.0GLP-J	2-Stroke	21533394
Volvo Penta	3.0GSPMDA	2-Stroke	21533394
Volvo Penta	3.0GLMMDA	2-Stroke	21533394
Volvo Penta	3.0GSMHUB	2-Stroke	21533394
Volvo Penta	3.0GSPHUB	2-Stroke	21533394
Volvo Penta	3.0GSMNCA	2-Stroke	21533394
Volvo Penta	3.0GSMNCS	2-Stroke	21533394
Volvo Penta	3.0GSPNCA	2-Stroke	21533394
Volvo Penta	3.0GSPNCS	2-Stroke	21533394
Volvo Penta	3.0GSMLKD	2-Stroke	21533394
Volvo Penta	3.0GSPLKD	2-Stroke	21533394
Volvo Penta	3.0GSMWTR	2-Stroke	21533394
Volvo Penta	3.0GSMWTS	2-Stroke	21533394
Volvo Penta	3.0GSPWTR	2-Stroke	21533394
Volvo Penta	3.0GSPWTS	2-Stroke	21533394
Volvo Penta	3.0GSPBYCCE	2-Stroke	21533394
Volvo Penta	3.0GSPEFS	2-Stroke	21533394
Volvo Penta	3.0GSMBYMCE	2-Stroke	21533394
MerCruiser	3.0L	2-Stroke	802523
OMC	3.0L	2-Stroke	987485

Technical Specs

Product Type: Carburetor Rebuild Kit
Installation: DIY with basic tools
Fuel Type: Gasoline
Fitting Type: Holley 2300 Marine Carburetor
Dimensions: 24.0 x 17.0 x 5.0
Other Technical Attributes: For Holley 2-barrel carburetor applications

Installation Notes

Disconnect the boat's battery and shut off the fuel supply valve.
Carefully label and disconnect all fuel lines, vacuum hoses, and linkages from the carburetor.
Remove the mounting bolts and lift the carburetor off the intake manifold.
Disassemble the carburetor on a clean workbench, organizing parts and taking photos for reference.
Thoroughly clean all non-replaceable metal parts with a quality carburetor cleaner spray.
Carefully remove old gaskets, seals, and o-rings, ensuring mating surfaces are clean.
Install the new components from the rebuild kit, referencing your photos or a service manual.
Reassemble the carburetor, ensuring all screws are properly torqued.
Install the rebuilt carburetor back onto the engine with a new base gasket.
Reconnect all linkages, hoses, and fuel lines.
Reconnect the battery, start the engine, and check for leaks. Adjust idle speed and mixture screws as necessary.

Troubleshooting & FAQ

How do I know if this kit is correct for my carburetor?

This kit is specifically for Holley 2300 model 2-barrel carburetors used on the Volvo Penta, OMC, and MerCruiser 3.0L engines listed in the compatibility table. The best way to confirm is to match your engine model and cross-reference the part number stamped on your carburetor or found in your service manual with our Part Number Matrix.

What are common signs that my carburetor needs a rebuild?

Symptoms of a failing carburetor include difficulty starting, rough or erratic idling, stalling at low speeds, poor acceleration, engine hesitation, excessive fuel consumption, fuel leaks, or black smoke from the exhaust.

Are any special tools required for this installation?

Most of the work can be completed with a standard set of hand tools, including screwdrivers, wrenches, and pliers. A can of carburetor cleaner and a clean, organized workspace are also highly recommended for a successful rebuild.

How often should a marine carburetor be rebuilt?

There is no fixed service interval. A rebuild is recommended whenever performance issues arise. The need depends on factors like fuel quality (especially with ethanol blends), hours of use, and whether the boat is stored for long periods.

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 vs 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.

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