Description
SIERRA Marine O-Ring, 1.875 x 0.135 in, 5-Pack – 18-7173-9 is a replacement sealing O-ring for MCM/MIE GM V6 and V8 thermostat housings with flat cover plates. Its published dimensions are 1.875 in inside diameter by 0.135 in cross-section, making size verification straightforward before installation.
Use the OEM interchange and measured seal dimensions together to confirm fitment. Clean the groove and mating surfaces before assembly, and lubricate only with a fluid compatible with the system and seal material.
Key Features
- 1.875 in inside diameter
- 0.135 in cross-section width
- 5-pack configuration
- For MCM/MIE GM V6 and V8 thermostat housings with flat cover plates
- OEM interchange provided below for fitment verification
Specifications
- Sierra part number: 18-7173-9
- Product type: Marine O-ring
- Inside diameter: 1.875 in (47.6 mm)
- Cross-section width: 0.135 in (3.4 mm)
- Package quantity: 5
Interchange
- Johnson/Evinrude: 310327
- Mercury Marine: 25-30224, 8M0204651
- OMC: 310327, 910582
- Mallory: 9-76501
- Recmar Marine: REC25-30224
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