Sierra 18-0203-9 Bell Housing Washer, Replaces Mercruiser 12-29395, Fits Sterndrives 1963-1998, Pack of 5
Sierra 18-0203-9 Bell Housing Washer, Replaces Mercruiser 12-29395, Fits Sterndrives 1963-1998, Pack of 5
The Sierra 18-0203-9 Bell Housing Washer is a brass conical spring washer designed for use at the bell housing joint on Mercruiser sterndrive units. It is sold in a package of 5, matching the quantity typically needed for a bell housing service or rebuild job. The conical spring design allows the washer to provide consistent seating pressure at the fastener location, helping maintain a secure, properly torqued connection during reassembly.
Built from brass, the washer resists corrosion in the marine environment better than uncoated steel alternatives, which matters given its location near the drive unit and exposure to bilge moisture and saltwater spray. Each washer measures 0.39 x 0.39 x 0.39 inches. The Sierra 18-0203-9 is intended as a direct equivalent for the original equipment washer it replaces, so it installs using the same fasteners and orientation as the factory part with no modification required.
This washer fits all Mercruiser sterndrives from 1963 to 1998, making it a common replacement part for owners doing bell housing maintenance, gasket replacement, or a full drive service on older Mercruiser-powered boats. Because it is sold in a 5-pack, it is priced and packaged for a complete job rather than a single washer replacement.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-0203-9
- Product Type: Bell Housing Washer
- Material: Brass
- Washer Type: Conical Spring
- Finish: Brass
- Item Dimensions: 0.39 x 0.39 x 0.39 inches
- Pack Quantity: 5
- Weight: 0.05 pounds
- UPC: 808282166816
Fitment
- All Mercruiser sterndrives, 1963-1998
Replaces (OEM)
- 12-29395
- 12-8M0042641
Frequently Asked Questions
What does the Sierra 18-0203-9 washer fit? The Sierra 18-0203-9 Bell Housing Washer fits all Mercruiser sterndrives from 1963 to 1998.
How many washers come in a pack? The 18-0203-9 is sold in a package of 5 brass bell housing washers.
What OEM part numbers does this washer replace? Sierra 18-0203-9 replaces OEM numbers 12-29395 and 12-8M0042641.
What material is the bell housing washer made from? It is made from brass, which resists corrosion better than uncoated steel in a marine bilge environment.
What size is the Sierra 18-0203-9 washer? Each washer in the 18-0203-9 pack measures 0.39 x 0.39 x 0.39 inches.
What type of washer is this? The 18-0203-9 is a conical spring washer, which provides consistent seating pressure at the bell housing fastener.
Is the Sierra 18-0203-9 an aftermarket or genuine Mercruiser part? It is a Sierra aftermarket washer manufactured to be a direct equivalent to the original Mercruiser bell housing washer it replaces.
How much does the 18-0203-9 washer pack weigh? The full package of 5 Sierra 18-0203-9 washers weighs 0.05 pounds.
Do I need a full pack of 5 for a bell housing job? The 18-0203-9 is packaged in quantities of 5 to match a typical bell housing service, though exact usage depends on the specific job.
Will this washer work on a Mercruiser from the 2000s? The Sierra 18-0203-9 is specified for Mercruiser sterndrives from 1963 to 1998; fitment outside that range is not confirmed for this part.