Mustang Engine Coolant O-Ring Kit- 4.6 4V | 96-04 by LMR® Products

Mustang Engine Coolant O-Ring Kit- 4.6 4V | 96-04

Overhaul the cooling system in your 4.6 4V equipped 1996-2004 Mustang Cobra or Mach 1 with this all-in-one engine coolant o-ring kit from industry leader LMR!

Item #LRS-8555R

Everyday Low Price: $29.99

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  • Prevents Coolant Leaks
  • Eliminates All Guesswork
  • Restores Proper Coolant Flow
  • Replaces Deteriorated O-Rings


  • Correct Durometer
  • Durable Rubber Construction
  • Chemical Resistant Compound
  • Factory Dimensions & Tolerances

 What's in the Box

  • (4) Coolant Crossover Tube O-Rings
  • (4) Heater Tube Nipple O-Rings
  • (2) Coolant Crossover Tube Vent Plug O-Rings
  • (2) Cylinder Head Water Inlet Heater Tube O-Rings

1996-2004 4.6 4V Engine Coolant O-Ring Kit

Replace the worn engine coolant o-rings and stop those pesky coolant leaks in your 4.6 4V equipped SN95 or New Edge Mustang with this premium coolant system o-ring kit from LMR! From the factory, the 4.6 4V was equipped with a very complex cooling system that utilized a coolant crossover tube and heater tube that were sealed together with specific o-rings. After years of service and abuse, these o-rings deteriorate causing coolant leaks and improper coolant flow. To prevent these leaks and the catastrophic issues that may occur from them, LMR has thoroughly researched and developed this engine coolant o-ring kit for your 4.6 4V modular engine!

LMR Quality

To properly bolster the phenomenal attention to detail, LMR utilized only the highest of quality materials when assembling this engine coolant o-ring kit for you. Eliminating coolant system leaks has never been easier as LMR provides the correct chemical resistant, rubber o-rings that utilize the factory dimensions, tolerances, and durometer to restore the proper flow of coolant in your 4.6 4V equipped Mustang. To seal the deal, LMR has taken the extra time and created an easy-to-follow reference guide to ensure your engine coolant system is correctly reassembled for the ultimate peace of mind!


Installation Note

  • O-rings must be lubricated before installation.
  • Due to the tight tolerances on some of these o-rings, LMR provides several extra o-rings in case of damage during the installation process. 
  • Please see our installation reference guide for the specific amount needed for your application. 


  • Fits 1996-2004 Mustang Cobra
  • Fits 2003-2004 Mustang Mach 1

LMR Products Limited Warranty -

  • Ford Mustang - 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
  • Engines: 4.6 4V
  • Depending on your application, your coolant crossover tube may require two o-rings (included) where the two halves connect together.

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About This Brand

LMR® Products
Late Model Restoration is dedicated to providing superior, solution-based products made from the highest quality materials for Ford Mustang and Ford Lightning enthusiasts. Through extensive research, LMR® branded items are comprised of the best, most effective parts our team has found to save the customer time, money, and present a complete offering that is ready to be installed. Built on automotive enthusiasts, LMR® is driven by a deep passion for delivering peace of mind through convenient solutions to common issues. Rest assured that when you purchase an LMR® branded part, you will experience industry-leading service.
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