Exhaust Manifold Gasket for MerCruiser GM 229/262 CID V6 Engines, 175–205 HP — Replaces 27-99757
Exhaust Manifold Gasket for MerCruiser GM 229/262 CID V6 Engines, 175–205 HP — Replaces 27-99757 is backordered and will ship as soon as it is back in stock.
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Exhaust Manifold Gasket for MerCruiser GM 229/262 CID V6 Engines, 1...
Exhaust Manifold Gasket for MerCruiser GM 229/262 CID V6 Engines, 175–205 HP — Replaces 27-99757 is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality exhaust manifold gasket is designed to seal the connection between the exhaust manifold and cylinder head on selected MerCruiser V6 engines using the GM 229/262 CID engine block. It is listed for 175–205 HP applications and is intended for dependable service in marine environments.
This aftermarket replacement is listed as an interchange for MerCruiser 27-99757 and 8M0215011, Sierra 18-2909-9, GLM 32170, Mallory Marine 9-61421 and 9-61425, Red Rhino MR-506, Barr Marine MC47-27-99757, Volvo Penta 3853412, and OMC 3853412, 910157, and 915025.
- Installation location: Between the exhaust manifold and cylinder head.
- Product type: Exhaust manifold gasket.
- Material: Marine-grade composite gasket material.
- Application: Selected GM 229/262 CID V6 marine engines and sterndrives.
- Quantity: One gasket.
Part Number Matrix
Use the following references to compare the gasket with the part removed from your engine. Part-number references do not replace verification of the exact engine model, year, configuration, and serial range.
| Brand | Part Number | Superseding Reference |
|---|---|---|
| MerCruiser | 27-99757 | 8M0215011 |
| Sierra | 18-2909-9 | |
| GLM | 32170 | |
| Mallory Marine | 9-61421 / 9-61425 | |
| Red Rhino | MR-506 | |
| Barr Marine | MC47-27-99757 | |
| Volvo Penta | 3853412 | |
| OMC | 3853412, 910157, 915025 |
Engine and Model Compatibility
The applications below are the listed compatibility references for this gasket. Confirm the engine model, exhaust configuration, year, and serial number before ordering. The same engine family may use different exhaust components depending on configuration and production range.
| Brand | Model | Rated Output | Engine Type | Years | Reference Part No. | Serial or Application Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 175 (2 BBL.) GM 262 V-6 | 175 HP | Gasoline V-6 | 1987 | 27-99757 | Serial range: 0B527955–0B773242 |
| MerCruiser | 185 (2 BBL.) GM 262 V-6 | 185 HP | Gasoline V-6 | 1985–1987 | 27-99757 | Serial range: 0A331455–0B527954 |
| MerCruiser | 185 (4 BBL.) GM 229 V-6 | 185 HP | Gasoline V-6 | 1983–1984 | 27-99757 | Serial range: 6330183–6919655 |
| MerCruiser | 205 (4 BBL.) GM 262 V-6 | 205 HP | Gasoline V-6 | 1985–1987 | 27-99757 | Serial ranges: 0A331455–0B527954 and 0B527955–0B775129 |
| MerCruiser | 262 MAG (TBI) GEN+ | 262 CID | Gasoline V-6 | 1996–1997 | 27-99757 | Serial range: 0F803800–0K999999 |
| MerCruiser | 4.3L (2 BBL.) GM 262 V-6 | 4.3L | Gasoline V-6 | 1988–1992 | 27-99757 | Serial range: 0B773243–0D714106 |
| MerCruiser | 4.3L GEN+ (2 BBL.) GM 262 V-6 | 4.3L | Gasoline V-6 | 1998 | 27-99757 | Serial range: 0L010044–0M614999 |
| MerCruiser | 4.3L GEN II (2 BBL.) GM 262 V-6 | 4.3L | Gasoline V-6 | 1992–1996 | 27-99757 | Serial range: 0D714107–0F802999 |
| MerCruiser | 4.3L Carbureted Alpha/Bravo | 4.3L | Gasoline V-6 | Selected applications through 2004 | 27-99757 | Multiple serial ranges; verify the exact engine and exhaust assembly |
| MerCruiser | 4.3L EFI/MPI models | 4.3L | Gasoline V-6 | 1998–2004 | 27-99757 | Multiple configurations and serial ranges |
| MerCruiser | 4.3LH / 4.3LX / 4.3LXH variants | 4.3L | Gasoline V-6 | 1988–1999 | 27-99757 | Multiple configurations and serial ranges |
| Volvo Penta | Selected sterndrives with GM 229/262 CID V-6 engines | GM V-6 | Gasoline V-6 | 1983 and later applications | 3853412 | Verify the sterndrive and exhaust configuration |
| OMC Stern Drive | Selected sterndrives with GM 229/262 CID V-6 engines | GM V-6 | Gasoline V-6 | 1983 and later applications | 3853412, 910157, 915025 | Verify the sterndrive and exhaust configuration |
Technical Specifications
- Product type
- Exhaust manifold gasket
- Installation position
- Between the exhaust manifold and cylinder head
- Material
- Marine-grade composite gasket material
- Application
- Selected MerCruiser, Volvo Penta, and OMC GM 229/262 CID V6 marine applications
- Replacement status
- Aftermarket replacement for the listed reference numbers
- Quantity
- 1 gasket
What's in the Box
- 1 x Exhaust manifold gasket
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Drain the engine block and exhaust manifold as required for the service procedure.
- Label and disconnect any wires, sensors, or hoses attached to the manifold.
- Remove the bolts securing the exhaust manifold to the cylinder head.
- Remove the old manifold and gasket carefully, avoiding damage to the mating surfaces.
- Clean the cylinder-head and manifold mating surfaces thoroughly. Remove old gasket material, corrosion, oil, and debris.
- Position the new gasket in the correct orientation using the alignment features on the cylinder head and manifold.
- Reinstall the exhaust manifold and hand-tighten the bolts.
- Torque the manifold bolts in the manufacturer's specified sequence and to the manufacturer's specified values.
- Reconnect all hoses, sensors, and wiring.
- Refill the cooling system as required, reconnect the battery, start the engine, and check for exhaust or water leaks.
Troubleshooting and FAQ
How do I know if this gasket fits my V6 engine?
Compare your engine's model, year, configuration, serial number, and existing gasket or reference number with the compatibility information above. This listing is intended for selected MerCruiser, Volvo Penta, and OMC marine applications using the GM 229/262 CID V6 engine family. When the model or serial range is uncertain, confirm the application before ordering.
What are the signs of a failing exhaust manifold gasket?
Possible symptoms include water or exhaust leakage at the manifold-to-cylinder-head joint, a ticking or hissing sound, unusual exhaust odor, elevated engine temperature, or water entering a cylinder. Stop operation and investigate promptly if water intrusion or an exhaust leak is suspected.
Is this gasket for wet-joint or dry-joint exhaust?
Compatibility depends on the exact manifold and engine configuration. The listed references cover selected applications described as wet-joint and dry-joint systems, but the gasket shape and part number should be compared with the existing component before installation.
How often should this gasket be replaced?
There is no universal replacement interval. Replace the gasket whenever the exhaust manifold is removed for service and whenever leakage, corrosion, or gasket damage is found.
Is this an OEM part?
No. This listing is for an aftermarket replacement gasket. The OEM and aftermarket numbers shown above are reference numbers for application and interchange identification.
What warranty and return coverage applies?
Warranty and return terms depend on the seller's current policy. Review the applicable policy before purchase and retain your order information if support is needed.
Safety and Important Information
- Verify the part number, gasket shape, engine model, year, configuration, and serial range before ordering.
- Do not operate the engine if an exhaust or cooling-water leak is present.
- Follow the engine manufacturer's service manual for bolt sequence, torque values, sealant requirements, and cooling-system procedures.
- Professional installation is recommended when the engine model or exhaust configuration is uncertain.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world marine conditions.
- Manufacturer-Direct Value — Practical aftermarket alternatives for common marine service applications.
- Marine-Focused Support — Use the engine model, serial number, and existing part number when confirming application details.
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