Reed Block Gasket – Fits Mercury/Mariner 135-200 HP Outboards (Replaces 27-935361)

$9.92 $15.00

Shipping calculated at checkout.

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 aftermarket Reed Block Gasket creates a precision seal for the reed block to housing interface on a range of Mercury/Mariner 135-200 HP V6 outboards manufactured between 1976 and 1990. It is designed for standard, Magnum, Marathon, and XR performance models.

It serves as a direct replacement for Mercury part numbers 27-935361, 27-93536, and 27-67738, as well as WSM part number 516-26.

Engineered for direct-fit installation.
Made from high-quality composite gasket material to ensure a durable seal.
Includes one gasket per package.

Part Number Matrix

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

Brand	Part Number
Mercury	27-935361
Mercury	27-93536
Mercury	27-67738
WSM	516-26

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This part is compatible with various Mercury and Mariner V6 models. Please verify your engine's serial number falls within the specified ranges for an exact match.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	V-135	135	2-Stroke	1989–1990	27-935361	0C100861 through 0C239552
Mercury	V-150	150	2-Stroke	1978–1990	27-935361	Multiple serial ranges
Mercury	V-150 Magnum	150	2-Stroke	1978–1990	27-935361	5600162 through 0A904645
Mercury	V-150 Marathon	150	2-Stroke	1978–1990	27-935361	5600162 through 0A904645
Mercury	V-150 Work	150	2-Stroke	1978–1990	27-935361	4868998 through 0A904645
Mercury	V-1500	150	2-Stroke	1978–1990	27-935361	Multiple serial ranges
Mercury	V-150-XR-2	150	2-Stroke	1986–1990	27-935361	4868998 through 0A904645
Mercury	V-175	175	2-Stroke	1976–1988	27-935361	Multiple serial ranges
Mercury	V-200	200	2-Stroke	1978–1988	27-935361	5239232 through 0C100860
Mercury	XR-4	150	2-Stroke	1988–1990	27-935361	0C100861 through 0C239552
Mercury	MAGNUM II	150	2-Stroke	1988–1990	27-935361	0C100861 through 0C239552
Mercury	XR-2	150	2-Stroke	1986–1990	27-935361	0B290314 through 0C276429

Technical Specs

Product Type: Reed Block Gasket
Installation: Direct replacement
Material: Composite (gasket material)
Dimensions: Height: 7.0 in; Width: 22.0 in; Length: 1.25 in
Weight: 0.043 kg (0.09 lb)
Application: Reed block to housing interface
Quantity Per Package: 1

What’s in the Box

1 x Gasket (Replaces 27-935361, 27-93536, 27-67738)

Installation Notes

Disconnect the battery and ensure the engine is off and cool.
Gain access to the engine's reed block assembly. This may require removing the carburetor or airbox.
Carefully remove the bolts securing the reed block housing.
Pry the old gasket away from the mounting surfaces. Use a plastic scraper to avoid gouging the metal.
Thoroughly clean both mating surfaces to remove all old gasket material and residue.
Position the new gasket, verifying correct orientation.
Reinstall the reed block housing and tighten the bolts to the manufacturer's specified torque.
Reassemble any other components that were removed.
After reassembly, check for any fuel or air leaks around the gasket area before resuming normal operation.

Troubleshooting & FAQ

How do I verify this gasket fits my specific Mariner or Mercury motor?

The most reliable method is to check your engine's model, year, and serial number against the compatibility table above. The serial number ranges are particularly important for ensuring an exact match.

What are the symptoms of a failed reed block gasket?

Common signs include difficulty starting, a rough or unstable idle, reduced engine power, hesitation during acceleration, and backfiring. You might also notice fuel or oil residue near the reed block housing.

Can I reuse my old gasket if it looks okay?

No. Gaskets are designed for single use. They compress to create a seal and will not provide a reliable seal if reused, likely leading to air or fuel leaks.

Is any sealant required with this gasket?

Generally, new gaskets are designed to be installed dry without any additional sealant. Applying sealant can sometimes interfere with a proper seal. Always follow your engine's service manual for specific recommendations.

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.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.