Sierra 47-237800 Oil Filter – Westerbeke Marine Diesel Engine
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sierra 47-237800 Oil Filter – Westerbeke Marine Diesel Engine
A direct-fit replacement oil filter for compatible Westerbeke marine diesel engines, built to Sierra’s marine-grade specifications. Westerbeke diesels are workhorses found on sailboats, trawlers, and liveaboard vessels — and keeping the oil filtration system in top condition is one of the most important steps in protecting engine longevity. This filter is engineered to maintain proper oil flow and filtration efficiency through the full service interval, trapping wear-causing contaminants before they reach critical engine components.
Sierra’s marine oil filters meet or exceed OEM specifications for filtration media quality, bypass valve performance, and thread fit. Always verify fitment against your specific Westerbeke engine model and service manual before ordering.
Key Features
- Direct-fit replacement for compatible Westerbeke marine diesel engines
- Meets or exceeds OEM filtration specifications
- Quality filtration media for effective contaminant removal
- Correct bypass valve rating for marine diesel service intervals
Best Use Case
The practical choice for sailors, trawler owners, and liveaboards performing routine oil changes on their Westerbeke diesel auxiliary engine or generator. Particularly useful for boaters who service their own engines and want a reliable, marine-rated aftermarket filter at a lower cost than the OEM part. Cross-reference your Westerbeke engine model number against Sierra’s application guide before installation to confirm fitment.
Parts Desk Insights
If your vessel runs a Westerbeke engine, you may also need impeller service kits — see the Sierra 47-233307 Impeller Kit for Westerbeke or the Sierra 47-233306 Impeller Kit for Westerbeke, as well as the Westerbeke Impeller Kit 48500 – Raw Water Pump Service Kit. For Onan generator oil filter needs, see the Sierra 47-237804 Oil Filter – Onan Marine Generator. For a universal full-flow marine oil filter option, see the Full-Flow Oil Filter – 20-Micron – Seachoice 50-21021.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.