Description
Product Overview
7791 Oil Filter Adapter 13/16"-16 to 1-1/8"-16 for Duramax CAT 1R-1807. Engineered for reliable performance and precision fitment, this iFJF aftermarket part meets or exceeds OEM specifications for durability and function. Ideal for DIY mechanics and professional technicians alike.
Key Features
-
Precision Thread Adapter: Converts 13/16"-16 to 1-1/8"-16 thread pattern for CAT 1R-1807 filter compatibility.
-
Aircraft-Grade Aluminum: CNC-machined from 6061-T6 billet aluminum — far stronger than cast alternatives.
-
Increased Filtration Capacity: Enables use of larger CAT 1R-1807 filter for extended service intervals and better oil filtration.
-
Duramax-Specific Fit: Designed for 2001-2016 GM 6.6L Duramax engines (LB7 through LML).
Compatibility
| Year |
Make |
Model |
Engine/Notes |
|
See Description |
7791 Oil Filter Adapter 13/16"-16 to 1-1/8"-16 for |
Direct Fit |
⚠️ Always verify fitment with your specific vehicle year, make, model, and engine before ordering. Contact our support team for compatibility questions.
Specifications
| Specification |
Value |
| Brand |
iFJF |
| Product Type |
Oil Filter Adapter |
| SKU |
FJ-AD17-SI |
| Price |
$37.99 USD |
| Thread Size |
13/16"-16 to 1-1/8"-16 |
| Material |
6061-T6 Billet Aluminum |
Why Choose iFJF?
-
Quality Assurance: Every iFJF part undergoes rigorous quality inspection before shipping.
-
Precision Engineering: Manufactured to tight tolerances for guaranteed fitment.
-
Expert Support: Our team of diesel and automotive specialists is ready to help with any questions.
-
Fast Shipping: Orders ship within 1-2 business days from our US warehouses.
Frequently Asked Questions
Q: What engines does this adapter fit?
A: This adapter fits 2001-2016 GM 6.6L Duramax diesel engines including LB7, LLY, LBZ, LMM, and LML variants. It converts the stock 13/16"-16 filter thread to 1-1/8"-16 for CAT 1R-1807 filter compatibility.
Q: Why would I want to run a CAT filter on my Duramax?
A: The CAT 1R-1807 filter offers significantly larger filtration media surface area and higher efficiency (2-micron absolute) compared to standard Duramax filters. This means cleaner oil, extended drain intervals, and better engine protection.
Q: Will this adapter cause any leaks?
A: No — when properly installed with the included O-ring seal and torqued to specification (18-22 ft-lbs), the adapter provides a leak-free seal. Always lubricate the O-ring with clean engine oil before installation.
Q: Is this compatible with aftermarket oil cooler lines?
A: Yes, this adapter maintains the stock filter position and clearance. It works with both OEM and aftermarket oil cooler lines and does not interfere with other engine components.
Order your 7791 Oil Filter Adapter 13/16"-16 to 1-1/8"-16 today — fast shipping, expert support, and the quality you can trust from iFJF Direct.
📖 Related Guides & Articles
