Gasket Under Oil Seal – Fits Suzuki DT40 Outboard Engines (Replaces 11433-94412, 11433-94411)
Gasket Under Oil Seal – Fits Suzuki DT40 Outboard Engines (Replaces 11433-94412, 11433-94411) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Gasket Under Oil Seal – Fits Suzuki DT40 Outboard Engines (Replaces...
Product Details
This aftermarket Gasket Under Oil Seal – Fits Suzuki DT40 Outboard Engines provides a reliable seal between the powerhead and engine base plate. It is designed for Suzuki 2-Stroke 35–40 HP models, including the DT40 and DT35TCLK series manufactured between 1986 and 2000.
It serves as a direct replacement for Suzuki OEM part numbers 11433-94411, 11433-94412, 11433-94412-000, 11433-92L00, and 11433-94410.
- Installs between the powerhead/engine block and engine base plate.
- Made from a durable, high-quality aftermarket paper/composite material.
- Engineered to seal the powerhead assembly in a marine environment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Suzuki | 11433-94411 | Interchangeable part number |
| Suzuki | 11433-94412 | Interchangeable part number |
| Suzuki | 11433-94412-000 | Superseded or alternative number |
| Suzuki | 11433-92L00 | Superseded or alternative number |
| Suzuki | 11433-94410 | Superseded or alternative number |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed specifically for the listed Suzuki 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DT40C | 40 | 2-Stroke | 1986–2000 | 11433-94412/11433-94411 | Under oil seal gasket |
| Suzuki | DT40W | 40 | 2-Stroke | 1986–2000 | 11433-94412/11433-94411 | Under oil seal gasket |
| Suzuki | DT40G | 40 | 2-Stroke | 1986–2000 | 11433-94412/11433-94411 | Under oil seal gasket |
| Suzuki | DT40X | 40 | 2-Stroke | 1986–2000 | 11433-94412/11433-94411 | Under oil seal gasket |
| Suzuki | DT35TCLK | 35 | 2-Stroke | 1986–2000 | 11433-94412/11433-94411 | Under oil seal gasket |
Technical Specs
- Product Type
- Under Oil Seal Gasket
- Installation
- Between powerhead/engine block and engine base plate
- Fuel Type
- Gasoline
- Engine Type
- 2-Stroke Outboard
- Engine Position
- Outboard
- Material
- Aftermarket replacement material (paper/composite)
- Dimensions
- 22.3 cm L x 22.0 cm W x 0.3 cm H
- Condition
- New
- Warranty
- Varies by manufacturer (typically 90 days to 1 year)
- Other Technical Attributes
- Part of the powerhead sealing system
What’s in the Box
- 1 x Gasket Under Oil Seal (Replaces 11433-94412/11433-94411)
Installation Notes
- Disconnect the battery and all fuel lines for safety.
- Carefully remove the powerhead from the engine's base plate, following the manufacturer's service manual.
- Remove the old gasket completely. Thoroughly clean and degrease both mating surfaces to ensure they are free of old material and debris.
- Place the new gasket into position, ensuring it aligns perfectly with all bolt holes and passages.
- Reinstall the powerhead. Tighten all bolts in the correct sequence and to the manufacturer-specified torque values to ensure an even seal.
- Reconnect the fuel lines and battery. Before operating on the water, check for any fuel or exhaust leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my Suzuki DT40?
This part is specifically for Suzuki DT40 and DT35 models made from 1986–2000. Verify your model and year using the compatibility table. The most reliable method is to match your old part's number to one of the cross-referenced numbers: 11433-94412, 11433-94411, 11433-92L00, or 11433-94410.
What are the signs of a failing under oil seal gasket?
Common symptoms include oil or fuel leaks visible between the powerhead and the lower unit, a drop in engine performance, unusual exhaust smoke, or water contamination in the oil. A visual inspection for cracks or degradation of the existing gasket is also a clear indicator.
Are part numbers 11433-94412 and 11433-94411 interchangeable?
Yes, all available data indicates that these part numbers are interchangeable. One likely superseded the other over time, but both refer to the same gasket for the specified engine models. This listing replaces both.
How often should this gasket be replaced?
This gasket does not have a fixed replacement interval. It should be replaced anytime the powerhead is removed for service, if it shows signs of leaking, or if it has become brittle and compressed due to age and heat cycles.
What is the difference between this and an original Suzuki gasket?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It is made from comparable high-quality composite materials to ensure a durable seal in marine conditions but is available at a more competitive price point.
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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