6PCS Injector Sleeve Tube w/Seal 3686961 3685966 Fits for Cummins ISX15 QSX15 X15 CM2350 Diesel Engine ISX single Cam
6PCS Injector Sleeve Tube w/Seal 3686961 3685966 Fits for Cummins ISX15 QSX15 X15 CM2350 Diesel Engine ISX single Cam is backordered and will ship as soon as it is back in stock.
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Powering 10,000+ Commercial Fleets
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One Year Warranty
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Easy 60-day Return
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Expert support & Fitment Guarantee
Description
Description
Injector Sleeve Tube with Seal 3686961 3685966 (Set of 6) – Replacement for Cummins ISX & ISX15 Diesel Engine
Aftermarket injector sleeve tube set with seals engineered for leak-free injector seating and reliable fuel system integrity in Cummins ISX and ISX15 diesel engine applications. Precision-manufactured components ensure drop-in compatibility with correct fitment.
Technical Specifications
- Part Numbers: 3686961, 3685966
- Quantity: 6 pieces per set (sleeves with seals)
- Condition: New, aftermarket replacement
- Function: Injector bore sealing, coolant passage isolation, and injector tip protection in the cylinder head
Equipment Compatibility
Fits Cummins Diesel Engine Models:
- ISX (Single Cam)
- ISX15
- QSX15
- X15 CM2350
Why Choose This Injector Sleeve Tube Set
The injector sleeve tube is a critical sealing component in your Cummins ISX engine’s cylinder head, isolating the injector from coolant passages and ensuring a leak-free, high-pressure fuel environment for precise injection. This replacement set delivers:
- Leak-free injector seating – Engineered to maintain correct bore dimensions and seal integrity for your Cummins ISX / ISX15 / QSX15 engine
- Exact-fit installation – Direct replacement with correct sleeve diameter, length, and seal specification
- Durable construction – Built to withstand high cylinder head temperatures, combustion pressure, and coolant exposure
- Cost-effective solution – Aftermarket quality at a fraction of dealer pricing
Package Contents
- 6 × Injector Sleeve Tube with Seal (3686961 / 3685966)
Essential for cylinder head rebuild, injector service, and preventive maintenance. Keep your Cummins ISX diesel engine running efficiently and reliably on every haul.
1 Year Warranty
1 Year Warranty
Fab Heavy Parts is excited to offer a 12-month warranty on all new replacement/aftermarket parts starting from your original purchase date.
Enjoy peace of mind with Fab Heavy Parts!
For more warranty details, please check out our warranty policy.
Fast Delivery
Fast Delivery
Estimated delivery time 3-6 workdays
No Core Charge
No Core Charge
We don't have a core charge for any products.
Frequently Asked Questions
Shipping and Delivery
What countries do you ship to?
What countries do you ship to?
We can ship to these countries:
Indonesia, Japan, Malaysia, Philippines, Singapore, South Korea, Thailand, Vietnam
United States
Belgium, San Marino, Italy, Spain, Netherlands, France, Germany, Finland, Austria, Denmark, Ireland, Luxembourg, Monaco, Norway, Sweden, Switzerland, Portugal, Poland, Hungary, Canada, Estonia, Australia, Mexico, New Zealand, Bulgaria, Croatia, Cyprus, Czechia, Greece, Greenland, Iceland, Liechtenstein, Lithuania, Malta, Romania, Russia, Slovakia, Slovenia, Latvia, Turkey, United Kingdom
How long will it take to receive my order?
How long will it take to receive my order?
Estimated delivery time to USA: 3-6 workdays;
Estimated delivery time to Canada, Mexico: 4-7 workdays;
Estimated delivery time to Australia: 4-7 workdays;
Estimated delivery time to European countries: 4-7 workdays;
Estimated delivery time to Asian countries: 3-5 workdays.
Returns and Refunds
How do I return a product?
How do I return a product?
Our return policy lasts 60 days. If 60 days have gone by since the delivery, unfortunately, we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused, not installed, clean and in the same condition that you received it. Shrink wrapping must not be broken. It must also be in the original packaging.
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
Steps of Returning Products to Fab Heavy Parts
1. Request returns in seconds at our return portal.
2. Fill in the email address you left with the order & the order number to start the return. Note: a correct order number format starts with a # hashtag
3. Select the items you wish to return and choose the return reason and upload photos of the received package.
Then, Fab Heavy Parts receives your return request and starts to process your return request. We may contact you for more details.
Steps after the approval of your return request:
1. A Return label will be sent to you via email. Print out the return label, place it on the parcel, and take it to the drop-off point. Make sure you properly pack the product for return if it’s returnable.
2. A refund of the original purchase price will be issued.
Any questions about returning products, please feel free to contact us at info@fabheavy.com
How long will it take to receive my refund?
How long will it take to receive my refund?
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment within 3-10 business days.
Payment Methods
What kind of payment methods do you accept?
What kind of payment methods do you accept?
We accept all major credit cards, PayPal, Google Pay, Apply Pay, Shop Pay, debit cards.
If you prefer offline payment, please contact us to get our bank transfer details.
Taxes or duties
Will I receive customs/import duties?
Will I receive customs/import duties?
For orders shipping to the United States, our price includes the import fees. The receiver/buyer doesn't need to pay any extra customs taxes, or duties for their packages. For orders shipping to non-US countries, please check our policy here.
