ONAN 509-0289 VALVE STEM SEAL - ONAN Genuine OEM Part
ONAN
- Payment methods
-
- SKU:
- ONAN 509-0289
- MPN:
- 509-0289
- Condition:
- New
- Availability:
- Ships (leaves our warehouse) within next business day if in stock


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Description
- Certified as a Genuine ONAN OEM replacement part
- Designed to maintain tight sealing around valve stems, preventing oil leaks
- Helps preserve engine integrity by reducing emissions and wear
- Support the trusted legacy of Cummins innovation and reliability
ONAN 509-0289 VALVE STEM SEAL - Precision in Every Seal, Power in Every Pulse
The ONAN 509-0289 valve stem seal serves a critical role by securing the valve stems to prevent oil from entering the combustion chamber, thus ensuring consistent engine performance and longevity. Built for excellence, this part safeguards your generator’s functionality and efficiency under demanding conditions. Invest in this essential component to maintain trusted reliability and extend engine life—secure yours now and embody Cummins’ commitment to durable power solutions.
Performance and Reliance with Genuine ONAN Excellence
- Original certification guarantees fitment and peak performance
- Durability ensures long-term engine protection and reduced maintenance
- Precision engineering minimizes emissions for environmentally responsible operation
- Compatibility designed specifically for Cummins/Onan generator systems
- Supports fuel economy by enhancing engine sealing efficiency
Details
Category: Valve Seals
Product SKU: ONAN 509-0289
We are fully committed to guiding you through every step of your purchase, providing expert advice tailored to your generator needs. Reach out anytime via our help center for personalized support. Our goal is to see you succeed with the best repair and optimal performance through quality components sourced directly from Cummins and Onan.
Returns Information
You may return new, non-used, and unopened items within 30 days of delivery date under a 20% re-stocking fee in case you do not need it anymore or you have ordered a wrong item.
We cannot accept any returns on "Pumps, Motors, Electrical Items & Transmissions" whether the product is used or new, however in rare cases we may allow an exception under a 40% re-stocking fee.
If you need to return an item, please go to our chat located in the lower right corner, select the option “Returns” and follow the steps to submit your request. Please have on your hands pictures of the item, they will be requested. You will shortly receive an answer from our Customer Service Team providing authorization and return instructions. Likewise, if an exception cannot be authorized, you will receive an answer from us. No returns will be accepted in our warehouse without an RMA number (Return Merchandise Authorization).
All return shipping costs are on customer's responsibility and will not be refundable.
Returns are inspected once they arrive. If the inspection determines that the items are used, non-resellable condition, or damaged, the return will be denied and the customer will be contacted to ship the parts back at the customers' request and cost.
Cancellations
You may cancel your order, in whole or in part, only if the part is backordered and it isn't ready to ship. Once an order has been shipped, sent from the supplier to our warehouse, or in the dispatch line, we cannot cancel it. If your order is shipped, you will need to follow our return policy to return the items you no longer want.
If you need to cancel an order or item for any reason, you may submit a cancellation request directly through your account to the "more options" section or contact us by live chat. All the cancellation requests are evaluated before its approval. If you submit a cancellation request out of business hours, on a weekend or holiday, it will be processed on the next available business day.
Please allow for the cancellation to be confirmed, and check your account for updates on the status. The cancellation process usually takes 24-48 hours to be confirmed by email. We will process your cancellation request and issue a refund to your original payment method.
In the event that an item becomes no longer available (NLA), we will cancel it from your order and ship the remaining items to you. We will send you an email notification if we cancel any part of your order.
Some products may contain chemicals known to the State of California to cause cancer or reproductive harm. ⚠️ WARNING: www.P65Warnings.ca.gov