Lnkvorx Diesel Common Rail Block-off Cap Set 12–20mm | 5-Piece Fits Cummins, Duramax, Ford Engines
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Description
xOverview
The Lnkvorx Diesel Common Rail Block-off Cap Set offers a compact, purpose-built solution for diesel injector diagnostics. This five-piece kit provides cap sizes from 12mm to 20mm, each designed to seal the fuel rail and safely isolate individual cylinders during testing. Crafted for durability, the caps are constructed from robust carbon steel and feature precise internal threading to ensure a snug, leak-free fit. The set supports a workflow that aims to verify injector behavior through controlled fuel flow, without implying guaranteed results.
What’s included
- Five block-off caps in nominal diameters: 12mm, 14mm, 16mm, 18mm, and 20mm. Internal threads are 1.5 pitch, matching standard fuel rail nuts.
- Each piece is designed to seal the fuel rail and block supply to a given cylinder during testing.
Compatibility and use cases
- 12mm cap: Ford 6.4L (2008–2010).
- 14mm cap: Ford 6.7L (2011–2022), Cummins 5.9L (2003–2009), Duramax 6.6L (2001–2005, 2017–2022).
- 16mm cap: Cummins 6.7L (2019–2022).
- 18mm cap: Duramax 6.6L (2011–2016).
- 20mm cap: Cummins 6.7L (2007–2018) and Duramax 6.6L (2006–2010).
- Also compatible with other engines that use similar rail hardware.
Performance and construction
Made from full carbon steel for durability, the caps are designed for repeated use in a workshop environment. The tool helps identify injector-related issues by safely isolating cylinders and allowing you to observe fuel pressure changes or engine response when a single port is blocked. The design focuses on clean engagement with the existing fuel rail nuts to minimize risk during testing.
How to use
- Shut down the engine and relieve fuel pressure according to your workshop procedure.
- Detach the fuel line from one cylinder at a time and thread the matching cap onto the rail.
- Repeat for additional cylinders as needed to compare responses and locate potential faults.
Notes
While the set provides practical diagnostic options, it is not a substitute for comprehensive fault analysis or professional training. Use with appropriate safety measures and PPE.
FAQ
Q: What is the Lnkvorx Diesel Common Rail Block-off Cap Set used for?
A: A five-piece tool set to seal the fuel rail and isolate cylinders for diagnostic testing.
Q: Which engines are compatible with this cap set?
A: Fits multiple diesel engines with 12–20 mm rail nuts, including Ford, Cummins, and Duramax models.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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