Intake Manifold Gasket – Fits MerCruiser 2.5L 153 CID 4-Cylinder (Replaces 27-35898T)
Intake Manifold Gasket – Fits MerCruiser 2.5L 153 CID 4-Cylinder (Replaces 27-35898T) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Intake Manifold Gasket – Fits MerCruiser 2.5L 153 CID 4-Cylinder (R...
Product Details
This Intake Manifold Gasket – Fits MerCruiser 2.5L 153 CID 4-Cylinder (Replaces 27-35898T) is designed for Mercury MerCruiser 110-120 HP, 4-cylinder 2.5L (153 CID) engines, specifically targeting pre-1990 models. It ensures a proper seal between the intake manifold and the cylinder head, which is critical for preventing vacuum leaks and maintaining engine performance.
It serves as a direct replacement for Mercury Marine 27-35898T, Sierra 18-0332, and GLM 31390, offering a reliable aftermarket alternative.
- Installs as a direct replacement for the original part.
- Designed for use in gasoline marine engines.
- This package includes a set of two gaskets.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 27-35898T |
| Sierra | 18-0332 |
| GLM | 31390 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, please verify your engine's model, CID, and year range against the compatible models listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 2.5L 153 CID | 110-120 | 4-Stroke | 1982–1995 | 27-35898T | Pre-1990 models |
Technical Specs
- Product Type
- Intake Manifold Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Fits Engine
- MerCruiser 2.5L 153 CID 4-Cylinder
- OEM Part Number
- 27-35898T
- Dimensions
- 15.5" L x 34.0" W x 0.2" H
What’s in the Box
- 2 x Intake Manifold Gasket (27-35898T)
Installation Notes
- Disconnect the vessel's battery and ensure the engine is cool.
- Drain the engine coolant to a level below the intake manifold.
- Carefully disconnect all fuel lines, electrical sensors, and linkages attached to the carburetor or throttle body and intake manifold.
- Remove the carburetor/throttle body assembly from the intake manifold.
- Unbolt the intake manifold from the cylinder head, following the manufacturer's recommended sequence.
- Carefully lift the manifold away from the engine.
- Thoroughly clean the gasket mating surfaces on both the cylinder head and the intake manifold. Ensure all old gasket material and sealant are removed.
- Position the new intake manifold gaskets correctly on the cylinder head. No sealant is typically required for this type of gasket, but check your service manual.
- Carefully place the intake manifold back onto the engine.
- Tighten the manifold bolts in the correct sequence and to the torque specifications outlined in your engine's service manual.
- Reinstall all previously removed components (carburetor, fuel lines, sensors, etc.).
- Refill the cooling system, reconnect the battery, and check for any fuel or coolant leaks before starting the engine.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific MerCruiser engine?
This gasket is for the 2.5L (153 CID) 4-cylinder engine, primarily for pre-1990 models, although some sources show compatibility up to 1995. The most reliable way to confirm fitment is by matching your old part's number to one of the cross-reference numbers: Mercury 27-35898T, Sierra 18-0332, or GLM 31390.
What are the signs of a failing intake manifold gasket?
Common symptoms include a rough or unstable idle, engine misfires, decreased power and acceleration, coolant leaks (which may appear near the top of the engine), or an engine that overheats. You may also hear a hissing sound from the engine bay, indicating a vacuum leak.
How often should this gasket be replaced?
Intake manifold gaskets do not have a fixed replacement interval. They are typically replaced only when they fail or during major engine work, such as a top-end rebuild. If you notice any signs of failure, it should be addressed immediately to prevent further engine damage.
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/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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