Exhaust Manifold Bolt Kit – Fits Volvo Penta OMC 8.1L (Replaces 3863191, 22145)
Exhaust Manifold Bolt Kit – Fits Volvo Penta OMC 8.1L (Replaces 3863191, 22145) 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
Product Details
This aftermarket Exhaust Manifold Bolt Kit is designed for specific gasoline marine engines, including Volvo Penta 8.1L models from 2005 to the present and older OMC V8 7.4L, 8.1L, and 8.2L engines manufactured between 1987 and 1999. It provides the necessary hardware to securely connect the exhaust manifold to the exhaust riser.
This kit serves as a direct replacement for Volvo Penta part number 3863191, GLM 22145, and Orbitrade 22145.
- Engineered for direct bolt-on installation.
- Features corrosion-resistant stainless steel hardware for marine environments.
- Contains all required studs, screws, and nuts for a single exhaust manifold. Two kits are needed for a dual manifold setup.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3863191 |
| GLM | 22145 |
| Orbitrade | 22145 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit fits modern Volvo Penta 8.1L gasoline engines (2005–Present).
It is also compatible with older OMC and Volvo Penta V8 big block engines (1987–1999).
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 8.1Gi-400 | 400 | 4-Stroke | 2005–Present | 3863191 | Single exhaust manifold |
| Volvo Penta | 8.1GXi-420 | 420 | 4-Stroke | 2005–Present | 3863191 | Single exhaust manifold |
| Volvo Penta | 8.1GiCE-J | 400 | 4-Stroke | 2005–Present | 3863191 | Single exhaust manifold |
| Volvo Penta | 8.1OSi | 420 | 4-Stroke | 2005–Present | 3863191 | Single exhaust manifold |
| OMC | 7.4L/454 CID | 330-340 | 4-Stroke | 1987–1999 | 22145 | Used with V8 GM big block engines |
| OMC | 8.2L/502 CID | 385-415 | 4-Stroke | 1987–1999 | 22145 | Used with V8 GM big block engines |
Technical Specs
- Product Type
- Exhaust Manifold Bolt Kit
- Installation
- Direct bolt-on
- Fuel Type
- Gasoline
- Connection
- Exhaust manifold to exhaust riser
- Housing Material
- Stainless steel
- Housing Color
- Silver
- Dimensions
- 16.0" L x 7.0" W x 3.0" H
- Fitting Type
- Flange studs, screws, and nuts
- Thread Size
- Metric (exact specifications in package contents)
- Operating Temperature
- Designed for high-temperature exhaust applications
- Warranty
- 1 year standard, 2 years when installed by authorized dealer
- Other Technical Attributes
- Corrosion-resistant hardware for marine applications
What’s in the Box
- 4 x Flange Screw (995463)
- 4 x Flange Nuts (990940)
- 4 x Studs (982974)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery before beginning work.
- Carefully remove the old exhaust manifold hardware, taking note of any specific placements. Be prepared to use penetrating oil on rusted bolts.
- Thoroughly clean the mating surfaces of the exhaust manifold and riser. Ensure they are free of old gasket material, rust, and debris.
- Place the new gasket (not included) onto the manifold, aligning it with the bolt holes.
- Loosely install the new studs, screws, and nuts from this kit. Do not tighten them fully.
- Tighten the hardware in a star or crisscross pattern to the manufacturer's recommended torque specifications to ensure an even seal.
- This kit is for a single manifold. If your engine has dual exhaust manifolds, you will need to purchase a second kit.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine model?
First, check your engine model and year against the compatibility table on this page. Second, cross-reference your existing part numbers with those listed in the Part Number Matrix. If you are unsure, consult your service manual or a qualified marine mechanic.
Is this kit for one or two exhaust manifolds?
This kit contains all the necessary hardware for a single exhaust manifold. If your engine has two manifolds (a dual manifold configuration), you will need to purchase two of these kits.
What are the signs that my old manifold bolts are failing?
Common signs include visible rust or corrosion on the bolts, water leaks around the manifold-riser joint, or an audible exhaust leak (a ticking or hissing sound) from the engine compartment, especially when the engine is cold.
Why is a specific tightening sequence important for these bolts?
Following the manufacturer's recommended torque specifications and tightening sequence (usually a crisscross pattern) ensures the manifold is seated evenly. This prevents warping the manifold flange and ensures a proper seal, avoiding exhaust and water leaks.
Why are stainless steel bolts used in this kit?
Stainless steel offers superior corrosion resistance compared to standard steel, which is critical in a marine environment where components are exposed to moisture and salt. This extends the life of the hardware and makes future servicing easier.
How often should I inspect my exhaust manifold hardware?
It's good practice to visually inspect exhaust hardware annually for signs of corrosion, rust, or leaks. In saltwater environments, more frequent checks are recommended. Replace any hardware that appears compromised to prevent catastrophic failure.
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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