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SeaSierra

Gasket, Cylinder Block to Exhaust – Fits Mercury/Mariner 30-60 HP Outboards (Replaces 8M0000822, 828553, 812865, 822420)

$13.49
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Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This is a direct replacement Gasket, Cylinder Block to Exhaust designed for a wide range of Mercury and Mariner 30-60 HP, 2-stroke outboard engines manufactured between 1991 and 2014, including standard, EL, EO, M, and ML series.

It serves as a direct interchange for multiple part numbers, including Mercury 8M0000822, 828553, 822420, and 812865.

  • Designed for direct, hassle-free installation.
  • Made from materials suitable for marine gasoline engine environments.
  • Ensures a proper seal between the cylinder block and the exhaust plate.

Part Number Matrix

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

Brand Part Number
Mercury 8M0000822
Mercury 828553
Mercury 822420
Mercury 812865
GLM 37861
EMP 27-27610

Engine & Model Compatibility

Confirm your engine model and year in the table below.

This gasket fits various 2-stroke outboards from Mariner, including EHO, ELH, ELO, M, ML, and other series from 30 to 60 HP.

This gasket fits various 2-stroke outboards from Mercury, including EHO, ELH, ELO, M, ML, and other series from 30 to 60 HP.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mariner 30 EHO 30 2-Stroke 1995–2000 8M0000822
Mariner 30 ELH 30 2-Stroke 2003 8M0000822
Mariner 30 ELHO 30 2-Stroke 1995–2000 8M0000822
Mariner 30 ELO 30 2-Stroke 1994–2006 8M0000822
Mariner 30 ELPTO 30 2-Stroke 1995–2006 8M0000822
Mariner 30 EMH 30 2-Stroke 2004 8M0000822
Mariner 30 EO 30 2-Stroke 1994–2003 8M0000822
Mariner 30 M 30 2-Stroke 1998–2004 8M0000822
Mariner 30 MH/ALT 30 2-Stroke 1994–1998 8M0000822
Mariner 30 ML 30 2-Stroke 1998–2004 8M0000822
Mariner 30 ML/ALT 30 2-Stroke 1998 8M0000822
Mariner 30 MLH/ALT 30 2-Stroke 1994–1998 8M0000822
Mariner 30 MLRC/ALT 30 2-Stroke 1994–1995 8M0000822
Mariner 30 MRC/ALT 30 2-Stroke 1994–1996 8M0000822
Mariner 40 ELHPTO 40 2-Stroke 1996–2003 8M0000822
Mariner 40 ELO 40 2-Stroke 1994–2006 8M0000822
Mariner 40 ELPT 4 40 2-Stroke 1997 8M0000822
Mariner 40 ELPTO 40 2-Stroke 1995–2006 8M0000822
Mariner 40 EO 40 2-Stroke 1994–2006 8M0000822
Mariner 40 JET 30 40 2-Stroke 1996–2000 8M0000822
Mariner 40 M 40 2-Stroke 1998–2006 8M0000822
Mariner 40 MH/ALT 40 2-Stroke 1994–1998 8M0000822
Mariner 40 ML 40 2-Stroke 1998–2006 8M0000822
Mariner 40 ML/ALT 40 2-Stroke 1998 8M0000822
Mariner 40 MLH/ALT 40 2-Stroke 1994–1998 8M0000822
Mariner 40 MLHGA 40 2-Stroke 2006 8M0000822
Mariner 40 MLL 40 2-Stroke 1998–2006 8M0000822
Mariner 40 MLLH 40 2-Stroke 1996–2006 8M0000822
Mariner 40 MLLH/ALT 40 2-Stroke 1994–1998 8M0000822
Mariner 40 MLRC 40 2-Stroke 1998–2001 8M0000822
Mariner 40 MLRC/ALT 40 2-Stroke 1994–1998 8M0000822
Mariner 40 MRC 40 2-Stroke 2000–2001 8M0000822
Mariner 40 MRC/ALT 40 2-Stroke 1994–2000 8M0000822
Mariner 40 MSL 40 2-Stroke 2001–2006 8M0000822
Mariner 50 ELHPTO 50 2-Stroke 1991–2004 8M0000822
Mariner 50 ELO 50 2-Stroke 1991–2006 8M0000822
Mariner 50 ELPTO 50 2-Stroke 1991–2006 8M0000822
Mariner 50 EO 50 2-Stroke 1991–2003 8M0000822
Mariner 55 M 55 2-Stroke 1998–2006 8M0000822
Mariner 55 MH 55 2-Stroke 1991–1998 8M0000822
Mariner 55 ML 55 2-Stroke 1998–2006 8M0000822
Mariner 55 ML/BF 55 2-Stroke 2000–2006 8M0000822
Mariner 55 MLH 55 2-Stroke 1991–1998 8M0000822
Mariner 55 MLH/ALT 55 2-Stroke 1995 8M0000822
Mariner 55 MLHGA 55 2-Stroke 2006 8M0000822
Mariner 55 MLL 55 2-Stroke 1998–2006 8M0000822
Mariner 55 MLLH 55 2-Stroke 1994–1998 8M0000822
Mariner 55 MLLH/ALT 55 2-Stroke 1994–1995 8M0000822
Mariner 55 MLLHGA 55 2-Stroke 2006 8M0000822
Mariner 55 MXLH 55 2-Stroke 1991 8M0000822
Mariner 60 ELHPTO 60 2-Stroke 1991–2004 8M0000822
Mariner 60 ELO 60 2-Stroke 1991–2001 8M0000822
Mariner 60 ELO JET 45 60 2-Stroke 1993 8M0000822
Mariner 60 ELO/BF 60 2-Stroke 1998–2006 8M0000822
Mariner 60 ELPTO 60 2-Stroke 1991–2006 8M0000822
Mariner 60 ELPTO BGFT 60 2-Stroke 1998 8M0000822
Mariner 60 ELPTO/BF 60 2-Stroke 1995–2006 8M0000822
Mariner 60 EO 60 2-Stroke 1991–2006 8M0000822
Mariner 60 EO JET 45 60 2-Stroke 1998–2004 8M0000822
Mariner 60 JET 40 EO 60 2-Stroke 2001–2004 8M0000822
Mariner 60 JET 45 60 2-Stroke 1995–1997 8M0000822
Mariner 60 JET 45 EO 60 2-Stroke 1993–2000 8M0000822
Mariner 60 ML/BF 60 2-Stroke 1998–2004 8M0000822
Mariner 60 MLH 60 2-Stroke 1996 8M0000822
Mariner 60 MLH/BF 60 2-Stroke 1995–1998 8M0000822
Mariner 60 MLHGA 60 2-Stroke 2006 8M0000822
Mariner 60 MLL/BF 60 2-Stroke 2000–2005 8M0000822
Mariner 60 MLLH 60 2-Stroke 1996 8M0000822
Mariner 60 MLLH/BF 60 2-Stroke 1995–1998 8M0000822
Mariner 60 MLLHGA 60 2-Stroke 2006 8M0000822
Mercury 30 EHO 30 2-Stroke 1995–2003 8M0000822
Mercury 30 ELHO 30 2-Stroke 1995–2003 8M0000822
Mercury 30 ELO 30 2-Stroke 1994–2006 8M0000822
Mercury 30 ELPTO 30 2-Stroke 1995–2006 8M0000822
Mercury 30 EO 30 2-Stroke 1994–2003 8M0000822
Mercury 30 M 30 2-Stroke 1998–2004 8M0000822
Mercury 30 MH/ALT 30 2-Stroke 1994–1998 8M0000822
Mercury 30 ML 30 2-Stroke 1998–2004 8M0000822
Mercury 30 MLH 30 2-Stroke 1994–1997 8M0000822
Mercury 30 MLH/ALT 30 2-Stroke 1994–1998 8M0000822
Mercury 30 MLRC/ALT 30 2-Stroke 1994–1995 8M0000822
Mercury 30 MRC/ALT 30 2-Stroke 1994–1995 8M0000822
Mercury 40 EL 40 2-Stroke 2000–2003 8M0000822
Mercury 40 ELHPTO 40 2-Stroke 1996–2004 8M0000822
Mercury 40 ELO 40 2-Stroke 1994–2014 8M0000822
Mercury 40 ELPTO 40 2-Stroke 1995–2014 8M0000822
Mercury 40 EO 40 2-Stroke 1994–2006 8M0000822
Mercury 40 JET 30 40 2-Stroke 1996–2000 8M0000822
Mercury 40 M 40 2-Stroke 1998–2006 8M0000822
Mercury 40 MH 40 2-Stroke 1995–1998 8M0000822
Mercury 40 MH/ALT 40 2-Stroke 1994–1998 8M0000822
Mercury 40 ML 40 2-Stroke 1998–2006 8M0000822
Mercury 40 MLH 40 2-Stroke 1995–2006 8M0000822
Mercury 40 MLH/ALT 40 2-Stroke 1994–1998 8M0000822
Mercury 40 MLHGA 40 2-Stroke 2006 8M0000822
Mercury 40 MLL 40 2-Stroke 1998–2004 8M0000822
Mercury 40 MLLH/ALT 40 2-Stroke 1994–1998 8M0000822
Mercury 40 MLRC 40 2-Stroke 1998–2001 8M0000822
Mercury 40 MLRC/ALT 40 2-Stroke 1994–1998 8M0000822
Mercury 40 MRC 40 2-Stroke 1998–2001 8M0000822
Mercury 40 MRC/ALT 40 2-Stroke 1994–1998 8M0000822
Mercury 40EFI ELPTO 4 40 4-Stroke 2004 8M0000822
Mercury 50 ELHO 50 2-Stroke 1991 8M0000822
Mercury 50 ELHPTO 50 2-Stroke 1991–2005 8M0000822
Mercury 50 ELO 50 2-Stroke 1991–2006 8M0000822
Mercury 50 ELPTO 50 2-Stroke 1991–2006 8M0000822
Mercury 50 EO 50 2-Stroke 1991–2005 8M0000822
Mercury 55 M 55 2-Stroke 1998–2006 8M0000822
Mercury 55 MH 55 2-Stroke 1994–1998 8M0000822
Mercury 55 MH/ALT 55 2-Stroke 1994–1995 8M0000822
Mercury 55 ML 55 2-Stroke 1998–2006 8M0000822
Mercury 55 MLH 55 2-Stroke 1991–1998 8M0000822
Mercury 55 MLH/ALT 55 2-Stroke 1994–1995 8M0000822
Mercury 55 MLHGA 55 2-Stroke 2006 8M0000822
Mercury 55 MLL 55 2-Stroke 1998–2006 8M0000822
Mercury 55 MLLH 55 2-Stroke 1994–1998 8M0000822
Mercury 55 MLLH/ALT 55 2-Stroke 1994–1995 8M0000822
Mercury 55 MLLHGA 55 2-Stroke 2006 8M0000822
Mercury 60 ELHPTO 60 2-Stroke 1991–2003 8M0000822
Mercury 60 ELO 60 2-Stroke 1991–2001 8M0000822
Mercury 60 ELO/BF 60 2-Stroke 1995–2006 8M0000822
Mercury 60 ELPTO 60 2-Stroke 1991–2006 8M0000822
Mercury 60 ELPTO/BF 60 2-Stroke 1995–2006 8M0000822
Mercury 60 EO 60 2-Stroke 1991–2006 8M0000822
Mercury 60 JET 40 EO 60 2-Stroke 2001–2005 8M0000822
Mercury 60 JET 45 60 2-Stroke 1996 8M0000822
Mercury 60 JET 45 EO 60 2-Stroke 1993–2000 8M0000822
Mercury 60 ML/BF 60 2-Stroke 2000–2004 8M0000822
Mercury 60 MLH 60 2-Stroke 1996 8M0000822
Mercury 60 MLH/BF 60 2-Stroke 1995–1998 8M0000822
Mercury 60 MLHGA 60 2-Stroke 2006 8M0000822
Mercury 60 MLL/BF 60 2-Stroke 2000–2005 8M0000822
Mercury 60 MLLH 60 2-Stroke 1996 8M0000822
Mercury 60 MLLH/BF 60 2-Stroke 1995–1998 8M0000822
Mercury 60 MLLHGA 60 2-Stroke 2006 8M0000822

Technical Specs

Product Type
Gasket, Cylinder Block to Exhaust
Installation
Direct replacement
Fuel Type
Gasoline
Housing Material
Acrylic
Housing Color
Black
Dimensions
310 mm × 210 mm × 4 mm
Weight
0.027 kg (0.06 lb)
Other Technical Attributes
Cylinder block to exhaust plate/extension plate gasket

What’s in the Box

  • 1 x Gasket, Cylinder Block to Exhaust Ext. Plate (Replaces 8M0000822)

Installation Notes

  1. Disconnect the battery and ensure the engine is cool before starting work.
  2. Drain any necessary fluids from the engine system according to the manufacturer's service manual.
  3. Carefully remove any components obstructing access to the exhaust plate to reach the old gasket.
  4. Remove the old gasket, being careful not to scratch or damage the mating surfaces of the engine block or exhaust plate.
  5. Thoroughly clean both mating surfaces, ensuring they are free of all old gasket material, sealant, and debris.
  6. Position the new gasket correctly, aligning it with any dowel pins or guide marks.
  7. Reinstall the exhaust plate and related components. Tighten all bolts in the sequence and to the torque values specified by the manufacturer.
  8. Refill any fluids that were drained and reconnect the battery.
  9. Once reassembled, start the engine and carefully inspect for any exhaust or fluid leaks around the new gasket.

Troubleshooting & FAQ

How do I confirm this gasket fits my specific engine model?

The most reliable method is to check the "Engine & Model Compatibility" table on this page. Compare your engine's brand, model, horsepower, and year against the listed models. You can also use the Part Number Matrix to see if our part cross-references with your existing part number.

What are the common signs of a failed cylinder block to exhaust gasket?

Symptoms of a bad gasket include an audible ticking or hissing exhaust leak, a noticeable loss of engine power, visible soot or water stains around the exhaust plate, and in severe cases, water intrusion into the cylinders, which can cause poor running or stalling.

Should sealant be used with this gasket?

Generally, modern gaskets like this one are designed to be installed dry without any additional sealant. Applying sealant can sometimes interfere with a proper seal. Always follow the specific instructions in your engine's service manual.

How is an aftermarket part different from an OEM part?

This listing is an aftermarket replacement, not an OEM part. It is engineered to meet or exceed original equipment manufacturer (OEM) specifications using comparable materials. Our parts are produced in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency, offering a reliable and cost-effective alternative.

What are the shipping options and costs?

We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be displayed at checkout.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original packaging. For full details or to start a return, please see our policy page or contact us for instructions.

Safety & Important Info

  • Verify images and 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.

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