Exhaust Plate Gasket – Fits Mercury Marine 3.0L OptiMax 200-250HP (Replaces 27-813932-2, 27-813933-5)

$69.99 $111.00

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Exhaust Plate Gasket – Fits Mercury Marine 3.0L OptiMax 200-250HP (Replaces 27-813932-2, 27-813933-5) is backordered and will ship as soon as it is back in stock.

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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).

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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 high-quality Exhaust Plate Gasket provides a reliable seal for the exhaust plate assembly on a range of Mercury Marine engines. It is specifically designed for 3.0L V6 OptiMax, DFI, Carb, and EFI models from 1999–2015 (200-250HP), as well as Mercury Sport Jet V6 DFI 250HP applications. Please verify your engine serial number for precise fitment, especially for models around the 1999 cutoff.

This component serves as a direct aftermarket replacement, offering an interchange for Mercury OEM part numbers 27-813932-2, 27-813933006, 27-813933-5, and 27-884428001.

Installation: Installs as a direct replacement for the original OEM gasket.
Function: Creates a crucial seal for the exhaust plate assembly to prevent water and exhaust leaks.
Material: Constructed from durable composite materials to withstand marine environments.

Part Number Matrix

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

Brand	Part Number	Notes
Mercury	27-813932-2	Primary OEM reference
Mercury	27-813933-5	Interchangeable
Mercury	27-813933006	Interchangeable
Mercury	27-884428001	Interchangeable

Engine & Model Compatibility

Confirm your engine model and year in the table below. It is always best to verify compatibility against your engine's serial number.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	OptiMax 3.0L	200	2-Stroke	1999–2015	27-813932-2	S/N OT599000-UP
Mercury	OptiMax 3.0L	225	2-Stroke	1999–2015	27-813932-2	S/N OT599000-UP
Mercury	OptiMax 3.0L	250	2-Stroke	1999–2015	27-813932-2	S/N OT599000-UP
Mercury	EFI 3.0L V6	225	2-Stroke	1999–2015	27-813932-2
Mercury	Carb 3.0L V6	225	2-Stroke	1999–2015	27-813932-2
Mercury	Sport Jet V6 DFI	250	2-Stroke	1999–2015	27-813932-2

Technical Specs

Product Type: Exhaust Plate Gasket
Installation: Direct replacement
Fuel Type: Compatible with gasoline engines
Housing Material: Composite
Dimensions: 36.5 cm x 23.0 cm x 0.3 cm
Weight: Approximately 0.9 kg (2 lbs)
Other Technical Attributes: Base gasket for exhaust plate assembly

What’s in the Box

1 x Exhaust Plate Gasket (Replaces 27-813932-2, 27-813933-5, 27-813933006, 27-884428001)

Installation Notes

Disconnect the battery and ensure the engine is cool.
Drain the engine cooling system to prevent spills.
Carefully remove the exhaust plate cover and any connected components.
Remove the old gasket and thoroughly clean both mating surfaces of any residue or corrosion.
Position the new gasket correctly, ensuring all bolt holes align.
Reinstall the exhaust plate cover, tightening bolts in the sequence and to the torque specifications recommended by the manufacturer.
Refill the cooling system, reconnect the battery, and start the engine. Check carefully for any water or exhaust leaks around the sealed area.

Troubleshooting & FAQ

How do I know if this gasket fits my engine?

First, check your engine details (Model, HP, Year) against the compatibility table provided. For absolute certainty, verify your engine's serial number falls within the specified range (e.g., S/N OT599000-UP). If you are unsure, do not purchase and contact a professional.

What are the signs of a failed exhaust plate gasket?

Common symptoms include water leaking into the cylinders, causing starting issues or hydrolock. Other signs are engine overheating, a noticeable drop in performance, or visible water and/or exhaust leaks from the exhaust plate area when the engine is running.

Is this gasket reusable?

No. Gaskets of this type are designed for one-time use. They crush to create a tight seal and should be replaced any time the components they seal are separated.

What is the difference between this part and the OEM version?

Functionally, there is no difference. Our aftermarket gasket is engineered from high-quality composite materials designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, seal, and durability in the marine environment.

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 and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement part, 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 quality control.

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