909786 Exhaust Manifold Elbow Riser Gasket for Volvo Penta OMC 4.3L 5.0L 5.7L 8.1L | JLM Marine

Exhaust Manifold Elbow Riser Gasket – Fits Volvo Penta OMC 4.3L 5.0L 5.7L 8.1L

This Exhaust Manifold Elbow Riser Gasket is engineered for various Volvo Penta and OMC Cobra marine engines, including 4.3L, 5.0L, 5.7L, and 8.1L models. It provides a reliable seal between the exhaust manifold and riser elbow, preventing exhaust leaks and ensuring optimal engine performance in demanding marine environments.

Direct Replacement for: Volvo Penta #3850496, #3863191 | OMC Cobra #913783, #909786, #3850496, #351325 | Sierra #18-0943. This aftermarket gasket delivers OEM-equivalent fit and durability at competitive value.

• Essential seal for exhaust manifold and riser assemblies
• Fits GL, Gi, Gxi, 200, 225, 270, 300, and 320 series models
• High-temperature resistant construction for long service life

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 × Exhaust Manifold Elbow Riser Gasket

Installation Guide

1. Ensure the engine is completely cool and disconnect the battery before beginning work.
2. Remove the exhaust riser elbow from the manifold by loosening the mounting bolts or clamps.
3. Clean both the manifold and elbow mating surfaces thoroughly, removing all remnants of the old gasket and carbon buildup.
4. Inspect the surfaces for warping, cracks, or corrosion; address any damage before proceeding.
5. Position the new gasket onto the exhaust manifold, aligning all bolt holes precisely.
6. Carefully place the riser elbow onto the gasket, ensuring proper alignment with the manifold.
7. Insert and hand-tighten all mounting bolts to hold the assembly in place.
8. Torque the bolts to manufacturer specifications in a cross-pattern sequence to ensure even compression.
9. Reconnect any water hoses, brackets, or components that were removed during disassembly.
10. Reconnect the battery and start the engine, allowing it to reach operating temperature.
11. Inspect the gasket area for any signs of exhaust or coolant leaks while the engine runs.
12. If leaks are detected, shut down the engine and re-torque the bolts after the engine cools.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my Volvo Penta or OMC engine?
A: Cross-reference your engine's displacement (4.3L, 5.0L, 5.7L, or 8.1L) and model series (GL, Gi, Gxi, 200, 225, 270, 300, 320) with the compatibility table above. You can also verify by matching the OEM part numbers (3850496, 3863191, 909786, etc.) from your engine's parts diagram.

Q: How often should I replace the exhaust manifold riser gasket?
A: Replace this gasket whenever you remove the riser elbow for service or repairs, or immediately if you notice exhaust leaks, coolant seepage, or corrosion around the joint. Many marine mechanics recommend inspection every 2–3 years or 200–300 hours of operation.

Q: What are the signs that my exhaust riser gasket is failing?
A: Common symptoms include visible exhaust smoke or soot around the manifold-to-riser joint, coolant dripping from the connection, a hissing sound during engine operation, or an overheating condition due to coolant loss.

Q: Can I reuse the old gasket if it looks intact?
A: No, exhaust gaskets are designed for one-time use and compress permanently under heat and pressure. Reusing an old gasket will likely result in leaks and potential engine damage.

Q: Do I need any sealant when installing this gasket?
A: Typically, no sealant is required; the gasket is designed to seal properly when torqued to specification. Consult your engine's service manual for any manufacturer-specific recommendations.

Q: Is this an OEM or aftermarket gasket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.