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


Description
- Genuine ONAN OEM replacement part ensuring perfect fit and original factory standards.
- Seals the valve stem to prevent oil leakage, maintaining optimal engine lubrication.
- Helps safeguard engine longevity by reducing contamination and wear on critical components.
- Engineered to preserve your generator's efficiency and reliability through precision sealing.
ONAN 509-0289 VALVE STEM SEAL - Trust the heart of your engine with ONAN’s precision craftsmanship
The ONAN 509-0289 valve stem seal plays a vital role in maintaining engine integrity by preventing oil from leaking into the combustion chamber. This precise component supports your generator’s smooth operation and extends engine life under demanding conditions. Secure this essential part now and protect your Cummins/Onan power system—because enduring reliability is built on genuine parts.
Experience the difference of authentic engineering crafted for your peace of mind
- Certified genuine ONAN component, designed specifically for compatibility with original equipment.
- Optimizes oil control around valves, enhancing combustion efficiency and reducing emissions.
- Manufactured to high tolerances that support long-term durability and engine health.
- Directly contributes to fuel economy by preserving optimal sealing under extreme operating temperatures.
- Reliability you can count on in both routine and critical power applications, including residential and commercial generators.
Details
Category: Valve Seals
Product SKU: ONAN 509-0289
Our support team is dedicated to guiding you through every step of your purchase, offering expert advice to ensure the right fit for your equipment. Feel confident knowing your engine is backed by authentic parts and focused care. We genuinely wish you success with your repair and look forward to helping you maintain dependable power for years to come.
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