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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No Hidden Charges Upon Arrival
Compatibility Information
| Make | Fits Cummins |
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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
- 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.
The Right Part, the First Time
Engine and hydraulic parts matched by part number, trusted by fleets, contractors and repair shops worldwide.
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Frequently Asked Questions
What is your return policy?
We accept returns within 60 days of delivery for unused parts in original packaging. To initiate a return, please submit your request through our return portal. Return shipping costs for non-defective items are the buyer's responsibility.
Can I cancel my order?
You may request a cancellation before your order has been dispatched. Once an order has been fulfilled and shipped, it cannot be cancelled — standard return terms will apply instead. Please contact us as soon as possible if you need to cancel.
What payment methods do you accept?
We accept all major credit and debit cards including Visa, Mastercard, and American Express. We also support PayPal, Apple Pay, and Google Pay at checkout. For B2B and trade customers, bank transfer and net payment terms may be available upon account approval — please contact us to discuss your requirements.
How long will delivery take?
Estimated delivery timeframes are displayed on most product pages and all tool listings. For parts without a displayed timeframe, standard delivery to US addresses is typically 5–10 business days from dispatch, depending on your location and the origin warehouse. Express shipping options may be available at checkout.
Will I be charged import tax or customs duties?
No. US customers are not charged any import fees or customs duties on their orders. The price you see is what you pay — there are no hidden charges added upon delivery.
How do I find out the shipping cost for my order?
You can get an estimated shipping cost directly on the cart page — just add your parts to the cart and enter your delivery zip code to see available shipping options and rates. For large or heavy orders requiring a freight quote, please contact us directly with your parts list and delivery zip code.
Do you offer trade accounts for US buyers?
Yes. US trade customers can apply for a B2B account to access volume pricing, bulk quotation, team invite and dedicated account support. Contact us directly to get started.
