Gasket – OMC 400-800 Series (Replaces 0909604, 909604)
Gasket – OMC 400-800 Series (Replaces 0909604, 909604) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gasket – OMC 400-800 Series (Replaces 0909604, 909604)
Product Details
This Gasket – OMC 400-800 Series (Replaces 0909604, 909604) is designed for OMC 400-800 series stern drive applications from 1978–1985, serving as a shift housing cover gasket for the lower gear housing.
It acts as a direct replacement for OEM part numbers 0909604 and 909604 and provides an interchange for aftermarket parts including GLM34690 and SEI Marine 95-105-58.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| OMC | 0909604 / 909604 | Original Equipment Manufacturer |
| Evinrude/Johnson | 0909604 / 909604 | Original Equipment Manufacturer |
| GLM | 34690 | Aftermarket Equivalent |
| SEI Marine | 95-105-58 | Aftermarket Equivalent |
| Barr Marine | OMC47-909604 | Aftermarket Equivalent |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is specified for OMC Stringer Mount Sterndrives within the 400-800 series.
Also compatible with certain Evinrude/Johnson models as a shift housing cover gasket.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| OMC | 400-800 Series Sterndrive | 1978–1985 | 0909604/909604 | For lower gear housing - Stringer mount |
| Evinrude/Johnson | 0909604/909604 | Shift Housing Cover Gasket |
Technical Specs
- Product Type
- Gasket, Shift Housing Cover
- Weight
- 0.14 kg (0.31 lbs)
- Product Width
- 9.0 in
- Product Height
- 2.5 in
- Product Length
- 0.1 in
- Manufacturer Part Number (MPN)
- 909604
- UPC
- 745419146191, 012345679473
What’s in the Box
- 1 x Gasket, Shift Housing Cover (0909604/909604)
Installation Notes
- Disconnect the battery and ensure the engine is off and cool.
- Drain the gearcase lubricant to prevent spills.
- Carefully remove the lower gear housing or shift housing cover, noting the position of all bolts and components.
- Remove the old gasket and thoroughly clean both mating surfaces. Ensure they are free of old gasket material, sealant, and debris.
- Position the new gasket correctly on the cleaned surface. Always check your service manual to see if a sealant is recommended.
- Reassemble the components in the reverse order of removal.
- Torque all fasteners to the manufacturer's specified values using a torque wrench.
- Refill the gearcase with the correct type and amount of lubricant.
- After reassembly, check for any leaks before operating the vessel.
Troubleshooting & FAQ
How do I confirm this gasket fits my OMC engine?
This gasket is for OMC 400-800 series sterndrives manufactured between 1978 and 1985. The most reliable way to confirm fitment is to match the OEM part number (0909604 or 909604) with the part number listed in your engine's service manual.
What are the symptoms of a failed shift housing cover gasket?
Common signs include milky, water-contaminated gear lube (indicating water intrusion), visible oil leaks from the housing area, or shifting problems caused by internal corrosion from water entry.
Should I use sealant with this gasket?
Consult your specific service manual. Some applications require the gasket to be installed dry, while others recommend a light, even coat of a marine-grade gasket sealant. Using the wrong method can cause leaks or damage.
How is this aftermarket part different from the OEM version?
Functionally, there is no difference. This is an aftermarket part manufactured to meet or exceed original equipment specifications for material, fit, and performance, offering a comparable seal at a more accessible price point.
When should this gasket be replaced?
This gasket should be replaced every time the component it seals (the shift housing cover) is removed for service or inspection. It is not considered a scheduled maintenance item with a fixed replacement interval.
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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