Gasket, Cylinder Head Cover – Fits Suzuki Outboard DF40, DF50 (Replaces Suzuki 11189-87J00; OMC 5031297)
Gasket, Cylinder Head Cover – Fits Suzuki Outboard DF40, DF50 (Replaces Suzuki 11189-87J00; OMC 5031297) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gasket, Cylinder Head Cover – Fits Suzuki Outboard DF40, DF50 (Repl...
Product Details
This replacement Gasket, Cylinder Head Cover ensures a precise, leak-free seal for the valve cover on Suzuki DF40 and DF50 4-Stroke outboard engines from 1999–2010, as well as select OMC 40HP and 50HP models.
It serves as a direct interchange for Suzuki part number 11189-87J00 and OMC 5031297, providing a reliable fit and restoring engine integrity.
- Engineered to meet or exceed OEM quality standards.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 11189-87J00 |
| OMC | 5031297 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Suzuki models, this part is documented to fit DF40 and DF50 engines manufactured between 1999 and 2010.
For OMC models, this part fits certain 40HP and 50HP engines where it replaces the original part number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF40 | 40 | 4-Stroke | 1999–2010 | 11189-87J00 | |
| Suzuki | DF50 | 50 | 4-Stroke | 1999–2010 | 11189-87J00 | |
| OMC | 40HP | 40 | 5031297 | Replaced by 11189-87J00 | ||
| OMC | 50HP | 50 | 5031297 | Replaced by 11189-87J00 |
Technical Specs
- Product Type
- Gasket, Cylinder Head Cover
- Weight
- 0.04 kg (0.09 lb)
- Dimensions
- 16.0" L x 10.0" W x 4.0" H
- Other Technical Attributes
- OEM Quality
What’s in the Box
- 1x Gasket, Cylinder Head Cover
Installation Notes
- Disconnect the negative battery terminal to prevent accidental shorts.
- Thoroughly clean the area around the cylinder head cover to prevent debris from falling into the engine.
- Remove any components obstructing access to the cover, such as ignition coils or wiring harnesses.
- Carefully loosen and remove the cylinder head cover bolts in the sequence specified by the manufacturer's service manual to prevent warping the cover.
- Gently pry off the cover. Remove the old gasket and meticulously clean any remaining residue from both the cover and the cylinder head mating surfaces using a plastic scraper and appropriate solvent.
- Position the new gasket correctly in the groove of the cylinder head cover.
- Reinstall the cover and hand-tighten the bolts. Torque the bolts to the manufacturer's specifications in the correct sequence using a torque wrench.
- Reattach all previously removed components.
- Reconnect the battery, start the engine, and carefully inspect for any oil leaks around the gasket seal.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
This part is a direct replacement for Suzuki DF40 & DF50 (4-Stroke, 1999–2010) and OMC 40HP & 50HP models that use part number 5031297. Always cross-reference your engine's model, year, and original part number with our compatibility table and part matrix.
What are the signs of a failing cylinder head cover gasket?
Common symptoms include visible oil leaks around the top of the engine, a smell of burning oil, dirt and grime buildup on the cover, and a low engine oil level. A leaking gasket can lead to performance issues if not addressed.
Do I need to use sealant with this gasket?
This gasket is typically designed to be installed dry. However, it's critical to consult your engine's service manual. Some manufacturers recommend applying a small amount of RTV silicone sealant at sharp corners or joints, such as where the timing cover meets the head.
How often should this gasket be replaced?
Cylinder head cover gaskets do not have a fixed replacement interval. They should be replaced whenever the valve cover is removed for service (like a valve adjustment) or as soon as any signs of leaking or degradation are detected.
Can I reuse my old cylinder head cover bolts?
While some bolts can be reused, many modern engines use torque-to-yield (stretch) bolts that are designed for single use. Always check your service manual. If reuse is permitted, ensure bolts are clean and threads are undamaged. If in doubt, replacing them is the safest option.
What is the difference between this and an OEM gasket?
This is an aftermarket part, not sourced from the original equipment manufacturer. It has been engineered to meet or exceed OEM specifications for fit, material, and performance and is produced in an ISO 9002 certified facility to ensure consistent quality.
What are your shipping speed and costs?
We ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be presented at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted for unused items in their original packaging within our standard return window. Refer to our policy page or contact us for specific 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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