Rear Crankshaft Sealing Flange Gasket – Fits Volvo B21/B23/B230 Engines (Replaces 1378492)
Rear Crankshaft Sealing Flange Gasket – Fits Volvo B21/B23/B230 Engines (Replaces 1378492) is backordered and will ship as soon as it is back in stock.
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Rear Crankshaft Sealing Flange Gasket – Fits Volvo B21/B23/B230 Eng...
Product Details
This is an aftermarket Rear Crankshaft Sealing Flange Gasket designed for a range of Volvo automotive and marine engines from 1984 to 1993, including the B21, B23, and B230 series (2.1L–2.3L). It provides a reliable seal for the rear main bearing area.
It serves as a direct replacement for Volvo OEM part numbers 1378492 and the superseded 463829.
- Installs at the rear crankshaft position.
- Engineered for applications with a 55 mm main bearing diameter.
- Includes one gasket as pictured.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo | 1378492 | Also replaces 463829 |
| Volvo | 463829 | Superseded by 1378492 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo automotive applications including models 240, 740, 760, 780, 940, 244, and 245.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo | 240 | 2.3L | 4-Stroke | 1990–1993 | 1378492 | Base, DL, GL, SE trims |
| Volvo | 740 | 2.3L | 4-Stroke | 1985–1992 | 1378492 | Base, GL, GLE, T trims |
| Volvo | 760 | 2.3L | 4-Stroke | 1984–1990 | 1378492 | Base, GLE trims |
| Volvo | 780 | 2.3L | 4-Stroke | 1989–1991 | 1378492 | Base trim |
| Volvo | 940 | 2.3L | 4-Stroke | 1991 | 1378492 | GLE trim |
| Volvo | 244 | 2.3L | 4-Stroke | 1987–1989 | 1378492 | DL, GL trims |
| Volvo | 245 | 2.3L | 4-Stroke | 1985–1989 | 1378492 | Base, DL, GL trims |
For Volvo Penta marine applications.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | AQ131A | 4-Stroke | 1378492/463829 | Engine component |
Technical Specs
- Product Type
- Crankshaft Sealing Flange Gasket
- Installation
- Rear
- Dimensions
- 15.5" L x 15.5" W x 0.1" H
- Other Technical Attributes
- For engines with main bearing diameter 55 mm
What’s in the Box
- 1 x Gasket (Replaces 1378492/463829)
Installation Notes
- Ensure the engine is off, cool, and disconnected from power. Disconnect the battery.
- Access the rear of the engine. This may require removing the transmission and flywheel/flexplate.
- Carefully remove the old crankshaft sealing flange and gasket. Note the orientation of the components.
- Thoroughly clean all mating surfaces, removing any old gasket material, sealant, oil, or debris.
- Position the new gasket onto the engine block, ensuring it aligns with the bolt holes.
- Install the sealing flange over the new gasket.
- Apply the correct sealant if specified by the service manual for your engine model.
- Tighten the flange bolts to the manufacturer's specified torque sequence and values.
- Reinstall the flywheel/flexplate, transmission, and any other removed components.
- Reconnect the battery, check fluid levels, and start the engine to check for leaks.
Troubleshooting & FAQ
How do I know if this gasket fits my Volvo engine?
This gasket is specifically for Volvo B21, B23, and B230 series engines, including automotive models from 1984–1993 and the Volvo Penta AQ131A marine engine. Always cross-reference the OEM part number (1378492 or 463829) and confirm your engine has a 55 mm main bearing diameter. When in doubt, compare the gasket shape to your original part before installation.
What are the signs of a failed rear crankshaft gasket?
The most common symptom is an oil leak from the area where the engine meets the transmission. You may notice oil drips on the ground under the bell housing, a drop in engine oil level, or a burning oil smell if it drips onto hot exhaust components.
Is any special sealant required with this gasket?
While the gasket itself is designed to seal, some service manuals may specify adding a thin bead of RTV silicone sealant at specific points, such as where the sealing flange meets the engine block or oil pan. Always consult your engine's official service manual for specific sealant recommendations and application procedures.
Can I replace this gasket without removing the engine?
Yes, in most vehicle applications, this gasket can be replaced by removing the transmission and flywheel/flexplate to gain access to the rear of the engine. However, it is a labor-intensive job that requires proper tools and mechanical knowledge.
What is the difference between part number 1378492 and 463829?
Part number 463829 is an older, superseded number. Volvo updated the part to 1378492. They are functionally identical and fully interchangeable for the applications listed.
How often should this gasket be replaced?
This is not a regular maintenance item. It should only be replaced if it fails and begins to leak. It is often replaced proactively as part of a major engine overhaul or when the transmission is removed for clutch service or other repairs, due to the difficulty of access.
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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