807166A1 4-Inch Exhaust Water Shutter for MerCruiser V6 & V8 (1998-Up)
807166A1 4-Inch Exhaust Water Shutter for MerCruiser V6 & V8 (1998-Up) is backordered and will ship as soon as it is back in stock.
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807166A1 4-Inch Exhaust Water Shutter for MerCruiser V6 & V8 (1...
807166A1 4-Inch Exhaust Water Shutter for MerCruiser V6 & V8 (1998-Up) is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
4-Inch Exhaust Water Shutter for MerCruiser V6 & V8 (1998-Up)
This aftermarket exhaust water shutter (flapper valve) is referenced to Mercury 807166A1 and is listed as a 4-inch version for MerCruiser Stern / Out Drive V6 and V8 exhaust applications from 1998 onward. It is not suitable for V6 engines that originally came with one-piece manifolds, and it is distinct from the separate 3-inch 99370A2 / GLM 89160 version.
Configuration & Specifications
| Component Type | Exhaust water shutter / flapper valve |
|---|---|
| Listed Size | 4-inch water shutter (for the 807166A1 / GLM 89175 reference; separate from the 3-inch 99370A2 / GLM 89160 version) |
| Manifold Exclusion | Will not work on V6 engines that came with one-piece manifolds |
Engine Applications
For replacing the exhaust water shutter in compatible MerCruiser V6 and V8 stern / out drive exhaust systems from 1998 onward. Match the required part number (including the suffix) and verify your manifold style and shutter diameter rather than selecting by appearance alone.
- MerCruiser Stern / Out Drive V6 engines — Years: 1998-Up. Configuration: 4-inch exhaust water shutter application; excludes V6 engines originally supplied with one-piece manifolds. Fits when specified
- MerCruiser Stern / Out Drive V8 engines — Years: 1998-Up. Configuration: 4-inch exhaust water shutter application. Fits when specified
Not Suitable For
- MerCruiser V6 engines with one-piece manifolds — Will not work on V6 engines that originally came with one-piece manifolds. Not suitable
- 3-inch water shutter applications (99370A2 / GLM 89160) — Those numbers refer to a separate 3-inch version and are not interchangeable with the 4-inch 807166A1 / GLM 89175 configuration. Not suitable
Reference Numbers
These public part numbers are provided for identification and cross-reference only; they do not indicate manufacturer identity or guarantee interchangeability across different suffix or size configurations.
| Primary OEM & 4-Inch References | Mercury / Mercury Mariner: 807166A1 Quicksilver: 807166a 1 |
|---|---|
| Aftermarket References (4-Inch) | GLM: 89175 OBR Red Rhino: MR-507 EMP: 32-08306 |
| Additional Listed OEM Suffix References | Mercury Mariner: 807166A2 Mercruiser Stern / Out Drive: 807166A2 Quicksilver: 807166A2 |
| Different Configuration Comparison (3-Inch Version — Not This Part) | 99370A2 GLM: 89160 |
Supplied Parts
- Exhaust Water Shutter
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Shut off the engine, allow all exhaust components to cool completely, and disconnect the battery to prevent accidental starting during service.
- Inspect the exhaust passage when removing the old water shutter and clear away any loose flapper fragments or hardware that may have dropped into the exhaust path.
- Verify that the replacement shutter matches the required 4-inch configuration and moves freely on its pivot points without binding against the exhaust housing.
- After reassembly, monitor the exhaust system during initial operation; shut the engine down and inspect immediately if abnormal exhaust noise or leakage occurs.
The Serdamarine Approach
Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.
Questions Before Replacement
How does 807166A1 (GLM 89175) differ from 99370A2 (GLM 89160)?
The 807166A1 / GLM 89175 reference is listed as a 4-inch water shutter, while 99370A2 / GLM 89160 is a separate 3-inch version. Because the shutter styles look similar in photos, selection must be based on the complete part number (including the suffix) and the required size.
Will this water shutter fit a 1998-Up MerCruiser V6 with one-piece exhaust manifolds?
No. Although this shutter is listed for 1998-Up MerCruiser V6 and V8 applications, V6 engines that originally came with one-piece manifolds are excluded.
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