Full-Flow Open Dry-Joint Exhaust Elbow Gasket for MerCruiser V6 & V8 — Replaces 27-864547A02, 27-864547A1
Full-Flow Open Dry-Joint Exhaust Elbow Gasket for MerCruiser V6 & V8 — Replaces 27-864547A02, 27-864547A1 is backordered and will ship as soon as it is back in stock.
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Full-Flow Open Dry-Joint Exhaust Elbow Gasket for MerCruiser V6 &am...
Full-Flow Open Dry-Joint Exhaust Elbow Gasket for MerCruiser V6 & V8 — Replaces 27-864547A02, 27-864547A1 is backordered and will ship as soon as it is back in stock.
Product Details
This full-flow open dry-joint exhaust elbow gasket is an aftermarket replacement for compatible MerCruiser V6 and V8 stern-drive and inboard applications using a dry-joint manifold and riser. It seals the mating surface between the exhaust manifold and elbow/riser.
The gasket replaces MerCruiser part numbers 27-864547A02 and 27-864547A1. Sierra catalog references identify the corresponding open dry-joint gasket as 18-0721. This is the open/full-flow version, not the restricted dry-joint gasket.
- Installation type: Dry joint
- Gasket style: Open/full flow
- Application: Exhaust manifold to elbow/riser
- Product type: Single exhaust elbow gasket
- Construction: Metal gasket construction
Part Number Matrix
Use these references to compare the gasket with the part being replaced. Part-number references do not replace checking the manifold, riser, mounting pattern, and engine serial range.
| Brand or source | Part number | Reference |
|---|---|---|
| MerCruiser | 27-864547A02 | Replacement reference |
| MerCruiser | 27-864547A1 | Replacement reference |
| Sierra | 18-0721 | Open/full-flow dry-joint gasket reference |
Engine & Model Compatibility
Catalog information associates this open dry-joint gasket with MerCruiser dry-joint manifold and riser applications in 4.3L, 5.0L, 5.7L, and 6.2L engines. The available reference identifies engine displacement and dry-joint configuration, but does not establish one universal fit for every model, year, or serial number. Confirm the exact engine application and compare the original gasket before ordering.
| Brand | Engine displacement | Stroke | Exhaust configuration | Reference | Fitment condition |
|---|---|---|---|---|---|
| MerCruiser | 4.3L V6 | 4-Stroke | Dry-joint manifold and riser | 27-864547A02 | Verify exact model, year, serial number, and gasket pattern |
| MerCruiser | 5.0L V8 | 4-Stroke | Dry-joint manifold and riser | 27-864547A02 | Verify exact model, year, serial number, and gasket pattern |
| MerCruiser | 5.7L V8 | 4-Stroke | Dry-joint manifold and riser | 27-864547A02 | Verify exact model, year, serial number, and gasket pattern |
| MerCruiser | 6.2L V8 | 4-Stroke | Dry-joint manifold and riser | 27-864547A02 | Verify exact model, year, serial number, and gasket pattern |
Technical Specifications
- Product type
- Exhaust elbow/riser gasket
- Quantity
- 1 gasket
- Installation
- Dry-joint exhaust system
- Gasket style
- Open/full flow
- Material
- Metal
- Application
- Exhaust manifold to elbow/riser
- Engine family
- MerCruiser V6 and V8 applications
- Listed displacements
- 4.3L, 5.0L, 5.7L, and 6.2L
- OEM replacement references
- 27-864547A02 and 27-864547A1
What’s in the Box
- 1 x Open/full-flow dry-joint exhaust elbow gasket
Installation Notes
- Disconnect the negative battery terminal and allow the engine to cool before beginning work.
- If required by the cooling-system configuration, drain coolant to a level below the exhaust elbow/riser.
- Remove the exhaust elbow/riser from the manifold according to the engine manufacturer’s service procedure.
- Remove the old gasket and clean both mating surfaces. Remove gasket residue, corrosion, oil, and debris without damaging the sealing surfaces.
- Confirm that the replacement is the open/full-flow gasket and position it correctly on the manifold.
- Reinstall the elbow/riser and tighten the fasteners in the manufacturer-specified sequence and to the specified torque.
- Reconnect any removed cooling hoses and refill the cooling system if it was drained.
- Reconnect the battery, start the engine, and inspect the joint for exhaust or water leakage after the engine reaches operating temperature.
Troubleshooting & FAQ
How do I know whether I need an open/full-flow or restricted dry-joint gasket?
This listing is for the open/full-flow dry-joint gasket. The restricted version is a different gasket. Confirm the gasket style specified for your exact manifold and riser assembly before installation; do not select by engine displacement alone.
Which engine displacements are listed for this gasket?
The available catalog reference lists 4.3L, 5.0L, 5.7L, and 6.2L MerCruiser engines using the dry-joint manifold and riser configuration. Exact model, year, serial number, and mounting pattern still require verification.
What are common signs of a failed exhaust elbow gasket?
Possible signs include water or exhaust leakage at the manifold-to-elbow joint, steam or exhaust odor in the engine compartment, unusual engine temperature, and corrosion or staining around the joint. Continued operation with a leak can cause serious engine damage.
When should the gasket be replaced?
Replace the gasket whenever the exhaust elbow/riser or manifold is removed, or whenever inspection shows leakage, damage, compression, or corrosion at the sealing joint.
Is this an OEM gasket?
This listing is for an aftermarket replacement gasket. MerCruiser and Sierra numbers are provided as application and replacement references only.
Safety & Important Information
- Verify the original gasket style, shape, bolt pattern, manifold, riser, engine model, year, and serial number before ordering.
- Do not substitute this open/full-flow gasket for a restricted gasket specified for your application.
- Use the engine manufacturer’s service instructions for fastener sequence, torque, coolant handling, and leak testing.
- Professional installation is recommended if the correct exhaust configuration or fitment cannot be confirmed.
About Sea Sierra
- Marine replacement parts selected for practical repair and maintenance applications.
- Clear part-number references to help compare replacement components.
- Support-focused product information for confirming application details before ordering.
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