Exhaust Elbow Gasket – Fits MerCruiser 4-Cylinder Engines (Replaces 27-856705)
Exhaust Elbow Gasket – Fits MerCruiser 4-Cylinder Engines (Replaces 27-856705) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Elbow Gasket – Fits MerCruiser 4-Cylinder Engines (Replaces...
Product Details
This high-quality Exhaust Elbow Gasket creates a durable seal between the exhaust elbow/reservoir and the manifold on specific MerCruiser 4-cylinder engines. It is designed for MerCruiser 165, 170, 190, 3.7L, 470, and 488 models manufactured between 1983 and 1989 that are equipped with aluminum exhaust manifolds.
This part is a direct interchange for Mercury 27-856705, Mercury 27-97542, Sierra 18-0113-1, and Quicksilver 27-856705.
- Installation Location: Between the exhaust elbow/reservoir and the exhaust manifold.
- Material Construction: Durable metal and fiber composite designed for marine environments.
- Engine Application: Specifically for MerCruiser 4-Cylinder engines with aluminum exhaust manifolds.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury | 27-856705 | 27-97542 | Current OEM Part |
| Quicksilver | 27-856705 | 27-97542 | OEM Alternative |
| Mercury | 27-97542 | 27-856705 | Superseded Part |
| Sierra | 18-0113-1 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model and serial number range in the table below to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 165 (4-Cyl.) 224/L4 | 165 | 4-Stroke | 1987 | 27-856705 | Serial Range: 0B434941–0B774251 |
| MerCruiser | 170 224/L4 | 170 | 4-Stroke | 1985–1986 | 27-856705 | Serial Range: 6916779–0B434940 |
| MerCruiser | 190 224/L4 | 190 | 4-Stroke | 1985–1986 | 27-856705 | Serial Range: 6916779–0B436390 |
| MerCruiser | 3.7L 224/L4 | 180-185 | 4-Stroke | 1988–1989 | 27-856705 | Serial Range: 0B774252 & Up |
| MerCruiser | 470 224/L4 | 170 | 4-Stroke | 1983–1984 | 27-856705 | Serial Range: 6218037–6916778 |
| MerCruiser | 488 224/L4 | 185 | 4-Stroke | 1983–1984 | 27-856705 | Serial Range: 6170297–6916778 |
Technical Specs
- Product Type
- Exhaust Elbow Gasket
- Material
- Metal/Fiber Composite
- Dimensions
- 6.0 × 7.5 × 0.13 inches (152 × 191 × 3.3 mm)
- Weight
- 0.05 lb (0.023 kg)
- OEM Part Number
- 27-856705
What’s in the Box
- 1 x Exhaust Elbow Gasket (Replaces 27-856705)
Installation Notes
- Ensure the engine is off and cool. Disconnect the battery and drain the cooling system as per your engine's service manual.
- Carefully remove the exhaust elbow and discard the old gasket.
- Thoroughly clean both mating surfaces on the manifold and the elbow. Remove all traces of old gasket material, scale, and corrosion.
- Position the new gasket correctly onto the manifold surface.
- Reinstall the exhaust elbow and tighten the bolts in a crossing pattern to the manufacturer's recommended torque specification to ensure an even seal.
- Reconnect the engine cooling hoses, refill the cooling system, and check for any leaks after starting the engine.
Troubleshooting & FAQ
How can I confirm this gasket fits my specific MerCruiser engine?
The most reliable method is to check your engine's serial number against the ranges listed in the Engine & Model Compatibility table. While model and year are good indicators, the serial number provides definitive proof of fitment.
What are the common signs of a failing exhaust elbow gasket?
Symptoms of a bad gasket include visible water or coolant leaks around the joint between the exhaust manifold and elbow, engine overheating, or excessive steam coming from the engine compartment, especially under load.
Do I need to use sealant with this gasket?
Generally, no sealant is required. This gasket is designed to create a seal on its own when installed on clean, flat surfaces and torqued to the correct specifications. However, always consult your engine's official service manual for factory recommendations.
How often should this gasket be replaced?
It is best practice to replace the exhaust elbow gasket any time the exhaust elbow is removed for service. It should also be replaced immediately if any signs of leakage or failure are detected.
Why does this part supersede 27-97542?
Manufacturers often update parts for improved materials, durability, or sealing performance. Part number 27-856705 is the modern, approved replacement for the older 27-97542, ensuring compatibility and reliability.
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 and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for identification purposes only.
- Professional installation is highly recommended for safety and optimal performance. Improper installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days, getting you back on the water sooner.
- Manufacturer-Direct Value — We offer fair pricing without compromising on materials or quality control by working directly with our manufacturing partners.
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