Reed Box Gasket – Fits Johnson/Evinrude 55-60 HP (Replaces 335633)

$13.45 $21.00

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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 aftermarket Reed Box Gasket is engineered for Johnson/Evinrude 55-60 HP, 2-stroke outboard engines manufactured between 1980–1997. It serves as a crucial component in the intake system, ensuring a proper seal between the manifold and the crankcase.

It directly replaces Johnson/Evinrude OEM part 335633 and interchanges with Sierra 18-0963 and Mallory 9-60440.

Installation Type: Direct Replacement
Function: Creates a seal for the intake manifold
Package Includes: 1x Gasket

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	335633 / 0335633
Johnson/Evinrude (Superseded)	777434
Sierra	18-0963 / 18-0963-9
Mallory	9-60440
GLM	35800

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket fits a range of Johnson and Evinrude outboards. While many specific models are covered by the HP and year range, always verify your OEM part number for an exact match.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson/Evinrude	Various	55	2-Stroke	1980–1997	335633
Johnson/Evinrude	Various	60	2-Stroke	1980–1985	335633
Johnson/Evinrude	E55RSLG	55	2-Stroke	1995	335633	Intake Manifold & Air Silencer component

Technical Specs

Product Type: Reed Box Gasket / Manifold to Crankcase Gasket
Installation: Direct Replacement
Fuel Type: Gasoline
Housing Material: Gasket Material
Product Dimensions: 11.25" H x 6.0" W x 1.13" L

What’s in the Box

1 x Gasket (Replaces 335633/0335633)

Installation Notes

Disconnect the battery and relieve fuel system pressure. Ensure the engine is cool.
Remove the air silencer and intake manifold cover to access the reed box assembly.
Carefully remove the old gasket, ensuring all residual material is scraped from the mating surfaces without gouging the metal.
Clean both the crankcase and manifold surfaces thoroughly with a suitable solvent.
Position the new gasket correctly, aligning it with all bolt holes and intake ports.
Reinstall the intake manifold and tighten bolts to the manufacturer's specified torque sequence and values.

Troubleshooting & FAQ

How do I know if my reed box gasket is failing?

Symptoms of a bad gasket include a rough idle, difficulty starting, poor acceleration, and backfiring through the carburetor. A visible fuel leak or staining around the intake manifold seam is also a clear indicator.

Can I reuse my old gasket?

No. Gaskets are single-use components designed to crush and create a seal. Once compressed and heat-cycled, they will not seal properly a second time and must be replaced.

Is any sealant required with this gasket?

Generally, this type of gasket is designed for dry installation. However, always consult your engine's service manual. Applying a very thin layer of a non-hardening, fuel-resistant sealant can sometimes help, but avoid silicone-based products that can clog intake passages.

Will this fit my 70 HP model from the same era?

No, this gasket is specifically for the 55 HP and 60 HP models listed. While the engines may look similar, the intake components often differ. Always verify the OEM part number (335633) for your specific engine model before ordering.

What is an OEM part vs. an aftermarket part?

This is an aftermarket replacement part, not sourced from the original equipment manufacturer (OEM). It is engineered to meet or exceed OEM specifications for fit, form, and function, offering a high-quality alternative. Our parts are made in an ISO 9002 certified facility and are batch-inspected for quality assurance.

How fast is shipping and what does it cost?

We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free to most locations. Expedited shipping options and final costs are displayed at checkout where available.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order number. Returns are accepted within our standard return window for unused items in original condition. See our full policy page or contact us for instructions.

Safety & Important Info

Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not order.
This is an aftermarket replacement component, not an OEM part.
Professional installation is strongly recommended for safety and to ensure optimal engine performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.

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