Exhaust Elbow Gasket – MerCruiser 4-Cylinder Aluminum Manifolds, Replaces Mercury Marine 27-97542
Exhaust Elbow Gasket – MerCruiser 4-Cylinder Aluminum Manifolds, Replaces Mercury Marine 27-97542 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Exhaust Elbow Gasket – MerCruiser 4-Cylinder Aluminum Manifolds, Re...
Exhaust Elbow Gasket – MerCruiser 4-Cylinder Aluminum Manifolds, Replaces Mercury Marine 27-97542 is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality Exhaust Elbow Gasket is designed to seal the joint between the exhaust elbow or reservoir and the exhaust manifold on specific MerCruiser 4-cylinder engines. It is intended for MerCruiser 165, 170, 190, 3.7L, 470, and 488 applications manufactured between 1983 and 1989 when equipped with compatible aluminum exhaust manifolds.
This aftermarket replacement corresponds to Mercury Marine OEM part number 27-856705 and replaces the earlier Mercury Marine reference 27-97542. Sierra aftermarket reference 18-0113-1 is also listed for these OEM applications.
- Installation location: Between the exhaust elbow or reservoir and the exhaust manifold.
- Construction: Steel gasket construction for the exhaust-manifold connection.
- Engine application: Specific MerCruiser 4-cylinder engines with compatible aluminum exhaust manifolds.
- Product format: Individual replacement gasket.
Part Number Matrix
Use the references below to compare the documented OEM and aftermarket numbers before ordering.
| Brand | Part Number | Relationship | Notes |
|---|---|---|---|
| Mercury Marine | 27-856705 | OEM reference | Primary OEM number for this gasket application |
| Mercury Marine | 27-97542 | Replaced reference | Earlier OEM number replaced by 27-856705 |
| Sierra | 18-0113-1 | Aftermarket reference | Aftermarket exhaust elbow gasket reference |
Engine & Model Compatibility
Confirm the engine model, year, and serial number range before ordering. The model and serial conditions should be considered together because similar MerCruiser model names can cover different configurations.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Serial Range |
|---|---|---|---|---|---|---|
| MerCruiser | 165 (4-Cylinder) 224/L4 | 165 | 4-Stroke | 1987 | 27-856705 | 0B434941–0B774251 |
| MerCruiser | 170 224/L4 | 170 | 4-Stroke | 1985–1986 | 27-856705 | 6916779–0B434940 |
| MerCruiser | 190 224/L4 | 190 | 4-Stroke | 1985–1986 | 27-856705 | 6916779–0B436390 |
| MerCruiser | 3.7L 224/L4 | 180–185 | 4-Stroke | 1988–1989 | 27-856705 | 0B774252 and up |
| MerCruiser | 470 224/L4 | 170 | 4-Stroke | 1983–1984 | 27-856705 | 6218037–6916778 |
| MerCruiser | 488 224/L4 | 185 | 4-Stroke | 1983–1984 | 27-856705 | 6170297–6916778 |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Material
- Steel
- Application
- Exhaust elbow to exhaust manifold connection
- Listed Dimensions
- 6.0 × 7.5 × 0.13 inches (152 × 191 × 3.3 mm)
- Listed Weight
- 0.05 lb (0.023 kg)
- OEM Part Number
- 27-856705
- Aftermarket Reference
- Sierra 18-0113-1
What’s in the Box
- 1 x Exhaust Elbow Gasket
Installation Notes
- Ensure the engine is switched off and completely cool. Disconnect the battery and drain the cooling system as directed by the engine service manual.
- Remove the exhaust elbow carefully and discard the old gasket.
- Clean both mating surfaces on the manifold and elbow. Remove old gasket material, scale, corrosion, oil, and debris.
- Position the replacement gasket correctly on the manifold surface, ensuring that all openings align with the mating components.
- Reinstall the exhaust elbow and tighten the fasteners in a crossing pattern to the manufacturer’s specified torque.
- Reconnect the cooling hoses, refill the cooling system, and inspect for leaks after starting the engine.
Troubleshooting & FAQ
How can I confirm this gasket fits my MerCruiser engine?
Compare the complete engine model, year, and serial number with the compatibility table. The serial number is especially important when the same model family was produced across multiple years or configurations.
What are common signs of a failing exhaust elbow gasket?
Possible symptoms include water or coolant leakage around the manifold-to-elbow joint, exhaust leakage, overheating, or unusual steam from the engine compartment, particularly under load.
Do I need sealant with this gasket?
Do not apply sealant unless the engine manufacturer’s service instructions specifically require it. A clean, flat mating surface and correct fastener torque are essential for a proper seal.
When should the gasket be replaced?
Replace the gasket whenever the exhaust elbow is removed for service. Replace it immediately if leakage, exhaust staining, or other sealing problems are found.
What does this part replace?
This gasket is listed for Mercury Marine OEM part number 27-856705 and replaces the earlier reference 27-97542. Sierra 18-0113-1 is the corresponding aftermarket reference.
Is this an OEM component?
No. This listing is for an aftermarket replacement gasket. Mercury Marine and MerCruiser names and part numbers are used only to identify the applicable engine and reference numbers.
How should I verify the part before installation?
Compare the old gasket’s shape and openings with the replacement, then confirm the complete engine model and serial number. Do not install the gasket if the mating profile or openings differ.
Safety & Important Information
- Verify the engine model, year, serial range, and gasket profile before purchase and installation.
- This is an aftermarket replacement part, not a Mercury Marine OEM component. Brand names and part numbers are provided for identification and compatibility reference.
- Allow the engine and exhaust components to cool fully before beginning work.
- Professional installation is recommended. Incorrect gasket placement or fastener torque can cause exhaust, water, or coolant leaks and may lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable fit and service in real-world applications.
- Global Fulfillment — We provide delivery options to customers in many regions.
- Marine Replacement Value — Our replacement parts are selected to provide practical repair solutions for marine maintenance.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
