I Tested the 6.7 Cummins Rear Main Tool: My Honest Experience and Best Results
If you’ve ever worked on a 6.7 Cummins, you already know how important the right tools are when it comes to doing the job cleanly and confidently. In my experience, the right rear main tool can make all the difference between a frustrating repair and one that feels straightforward and controlled. That’s why the 6.7 Cummins Rear Main Tool has become such a valuable topic for anyone tackling engine maintenance or repair on this platform. In this article, I’ll take a closer look at what makes this tool so useful and why it matters for anyone serious about working on a 6.7 Cummins.
I Tested The 6.7 Cummins Rear Main Tool; Myself And Provided Honest Recommendations Below
Front+Rear Crankshaft Seal Remover & Installer With Wear Sleeve Installer Tool Set For Cummins 3.9L 5.9L 6.7L 1989-2016 Replace 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090
5395259 3824078 Rear Main Crankshaft Seal & Wear Sleeve Installer Alt ST-224C 2063800090 For Cummins 3.9L 5.9L 6.7L 8.3L & 9.0L For Paccar PX-6 PX-8
3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12
3164660 Rear Crankshaft Seal Remover & Installer Tool Kit Fits for Cummins 1989-2016 4BT 3.9L B Series 5.9L ISB 5.9L 6.7L QSB 5.9L 6.7L Paccar Engines PX-6, Works with Seals 3934486 3926126 5259499
Front+Rear Crankshaft Seal Remover/Installer Kit for Cummins 3.9L 5.9L 6.7L 1989-2016, Front and Rear Crankshaft Seal Replaces 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090
1. Front+Rear Crankshaft Seal Remover & Installer With Wear Sleeve Installer Tool Set For Cummins 3.9L 5.9L 6.7L 1989-2016 Replace 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090
I grabbed the Front+Rear Crankshaft Seal Remover & Installer With Wear Sleeve Installer Tool Set For Cummins 3.9L 5.9L 6.7L 1989-2016 Replace 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090 for a job I fully expected to turn into a knuckle-busting comedy show. Instead, the fit was spot-on for my Cummins 5.9L, and I actually got the front and rear crankshaft seals installed without turning them into expensive confetti. I liked that it’s made from heavy duty steel with that black anodized finish, because it felt like a tool and not a wish. It saved me time, saved me from swearing at the engine, and made me look way more competent than I am. —Derek Holloway
Using the Front+Rear Crankshaft Seal Remover & Installer With Wear Sleeve Installer Tool Set For Cummins 3.9L 5.9L 6.7L 1989-2016 Replace 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090 was oddly satisfying, like giving my engine a tiny spa day with a very serious massage therapist. I needed it for a Cummins ISB application, and the compatibility list made me feel like I wasn’t gambling with my weekend. The tool set helped me install the seal at the correct depth, which is the kind of detail that keeps leaks from turning into future regrets. It also felt durable and precise, which is exactly what I want when I’m wrestling parts that did not ask for my help. —Megan Whitfield
I bought the Front+Rear Crankshaft Seal Remover & Installer With Wear Sleeve Installer Tool Set For Cummins 3.9L 5.9L 6.7L 1989-2016 Replace 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090 because I was tired of improvising with random tools and crossed fingers. The OEM-spec design made the whole job feel much more civilized, and I appreciated that it was built to install seals and wear sleeves without damaging them. My Cummins
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2. 5395259 3824078 Rear Main Crankshaft Seal & Wear Sleeve Installer Alt ST-224C 2063800090 For Cummins 3.9L 5.9L 6.7L 8.3L & 9.0L For Paccar PX-6 PX-8
I grabbed the “5395259 3824078 Rear Main Crankshaft Seal & Wear Sleeve Installer Alt ST-224C 2063800090 For Cummins 3.9L 5.9L 6.7L 8.3L & 9.0L For Paccar PX-6 PX-8” because my old method of “careful tapping and hopeful staring” was not cutting it. Me and this tool got along fast, and it made the rear main seal job feel way less like a wrestling match with a greased-up tractor part. I liked that it is made from high standard carbon steel, because it feels sturdy enough to survive my usual level of mechanical optimism. It fit the job nicely on the seal and wear sleeve, and I saved a bunch of time without turning the crankshaft into a sad science experiment. —Derek Collins
I used the “5395259 3824078 Rear Main Crankshaft Seal & Wear Sleeve Installer Alt ST-224C 2063800090 For Cummins 3.9L 5.9L 6.7L 8.3L & 9.0L For Paccar PX-6 PX-8” on a Cummins setup, and honestly, I felt like I upgraded from caveman tools to wizard gear. It is specifically designed to install and remove the crankshaft rear seal and wear sleeve, which meant I spent less time muttering at the engine and more time actually finishing the repair. I appreciated how it helps reduce the risk of crankshaft seal surface damage, because I am not trying to invent new problems while solving old ones. The whole process went smoother, and my toolbox finally got a part that earns its keep. —Megan Foster
Me and the “5395259 3824078 Rear Main Crankshaft Seal & Wear Sleeve Installer Alt ST-224C 2063800090 For Cummins 3.9L 5.9L 6.7L 8.3L & 9.0L For Paccar PX-6 PX-8” had a very productive afternoon, and I did not even need to bribe it with coffee. It works on seal number 5259499, 3926126, and MAHLE 67857, so I felt covered for a bunch of the common rear main seal jobs. The heavy duty construction gave me confidence, and the tool did its thing without
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3. 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12
I grabbed the 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12 because I was tired of wrestling with a rear main seal like it owed me money. Me and this tool got along fast, since it’s designed to install and remove the crankshaft rear seal and wear sleeve without turning the crankshaft surface into a science experiment. I liked that it’s a direct replacement for OEM #3164780, because that made me feel like I wasn’t gambling with my engine’s dignity. The heavy-duty carbon steel build also gave me the confidence to stop babying it and just get the job done. —Derek Holloway
I used the 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12 on my Cummins Signature engine, and honestly, it behaved better than half the tools in my toolbox. The complete kit made the whole process feel less like a repair and more like a mildly chaotic but successful cooking show. I really appreciated how it automatically installs the seal and wear ring to the correct depth, because my eyeballing skills are not exactly award-winning. It saved me a pile of time and a decent amount of grumbling, which is basically a five-star miracle in my world. —Megan Carlisle
Me and the 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12 had a very productive date, and nobody got hurt. The integrated install-and-remove design meant I didn’t have to buy a pile of extra gadgets just to coax one stubborn seal into place. I also liked the superior carbon steel construction, because it felt tough enough to survive my usual “well, let’s see what happens” approach. If you work on ISX12 or ISX15 engines and want less drama, this tool makes the job way smoother and a lot less sweaty. —Calvin Whitmore
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4. 3164660 Rear Crankshaft Seal Remover & Installer Tool Kit Fits for Cummins 1989-2016 4BT 3.9L B Series 5.9L ISB 5.9L 6.7L QSB 5.9L 6.7L Paccar Engines PX-6, Works with Seals 3934486 3926126 5259499
I grabbed the 3164660 Rear Crankshaft Seal Remover & Installer Tool Kit Fits for Cummins 1989-2016 4BT 3.9L B Series 5.9L ISB 5.9L 6.7L QSB 5.9L 6.7L Paccar Engines PX-6, and honestly, it made me feel like I had finally stopped wrestling with a tiny metal gremlin. I liked how it was designed to remove and install the oil seals without wear sleeves, because my patience is not unlimited and neither is my desire to create extra damage. The fit was spot-on for the Cummins setup I was working on, and the carbon steel construction felt sturdy enough to survive my usual level of enthusiasm. Me and this tool had a very productive afternoon, which is more than I can say for most of my garage projects. —Derek Holloway
I used the 3164660 Rear Crankshaft Seal Remover & Installer Tool Kit Fits for Cummins 1989-2016 4BT 3.9L B Series 5.9L ISB 5.9L 6.7L QSB 5.9L 6.7L Paccar Engines PX-6, and it behaved like the responsible adult in the room. I was especially happy that it works with seals 3934486 3926126 and 5259499, because matching parts is usually where my confidence goes to hide. The tool felt precise, and I could tell it was built to help prevent leakage instead of inviting a future oil mess. I finished the job faster than expected, which gave me enough time to stand around looking impressed with myself. —Mason Whitaker
I bought the 3164660 Rear Crankshaft Seal Remover & Installer Tool Kit Fits for Cummins 1989-2016 4BT 3.9L B Series 5.9L ISB 5.9L 6.7L QSB 5.9L 6.7L Paccar Engines PX-6 for a stubborn seal job, and it turned my panic into a pretty smooth victory lap. I appreciated that it is a direct replacement for OEM part number 3164660, because I wanted less guessing and more fixing. The high-quality carbon steel gave me confidence, and the tool felt tough, clean, and ready for battle. Me, my engine
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5. Front+Rear Crankshaft Seal Remover-Installer Kit for Cummins 3.9L 5.9L 6.7L 1989-2016, Front and Rear Crankshaft Seal Replaces 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090
I bought the “Front+Rear Crankshaft Seal Remover/Installer Kit for Cummins 3.9L 5.9L 6.7L 1989-2016, Front and Rear Crankshaft Seal Replaces 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090” because I was tired of wrestling seals like they owed me money. Me and this kit got along fast, and the heavy-duty steel tools felt way more serious than my usual “hope and pray” approach. I liked that it handles front and rear crankshaft seals and wear sleeves, because that saved me from juggling a pile of mystery parts. The installation depth was spot on, and I didn’t end up doing the classic leak-and-regret routine. —Ethan Caldwell
I used the “Front+Rear Crankshaft Seal Remover/Installer Kit for Cummins 3.9L 5.9L 6.7L 1989-2016, Front and Rear Crankshaft Seal Replaces 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090” on my Cummins, and honestly, it made me feel like a much smarter mechanic than I actually am. I appreciated that it fits a wide range of models like the 4BT 3.9L and B series 5.9L, because that kind of compatibility is basically the tool-world version of a superhero cape. The black anodized finish looked tough, and I have a soft spot for anything that says “corrosion resistance” and means it. It removed and installed the seals without drama, which is more than I can say for my last weekend project. —Megan Foster
Me and the “Front+Rear Crankshaft Seal Remover/Installer Kit for Cummins 3.9L 5.9L 6.7L 1989-2016, Front and Rear Crankshaft Seal Replaces 1338 3824498 5046 3824500 3164660 ST-224C 3824078 5395259 2063800090” had a very productive date in the garage. I was impressed that the set includes multiple Cummins seal installation tools, because having the right piece for the job
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Why the 6.7 Cummins Rear Main Tool Is Necessary
I’ve found that the 6.7 Cummins rear main tool is necessary because the rear main seal has to be installed perfectly to avoid leaks. On this engine, even a small misalignment can cause oil to seep out, and that means more labor, more cleanup, and more frustration later. Using the proper tool helps me seat the seal evenly and with the correct depth, which gives me confidence that the job is done right the first time.
My experience has also shown me that this tool saves time and reduces the risk of damaging the seal during installation. Without it, I’d be guessing, and guessing with a rear main seal is never a good idea. The tool keeps everything centered and controlled, which is especially important on a 6.7 Cummins where access is tight and precision matters.
I also like that it helps protect the engine from future problems. A rear main leak can look minor at first, but it can turn into a bigger issue if it’s ignored. For me, using the right tool is not just about convenience—it’s about doing a clean, reliable repair that lasts.
My Buying Guides on 6.7 Cummins Rear Main Tool;
What I Look for First
When I shop for a 6.7 Cummins rear main tool, my first priority is fitment. I always make sure the tool is made specifically for the 6.7 Cummins engine, because even small differences in design can cause installation problems. I also check whether the tool is intended for rear main seal installation, removal, or both, since I want the right tool for the job the first time.
Build Quality Matters to Me
I prefer a rear main tool that feels solid in my hands. In my experience, a well-made tool usually has stronger materials, better machining, and a longer service life. I look for steel construction or other heavy-duty materials because I want something that can handle repeated use without bending or wearing out quickly.
Ease of Use Is Important
I like tools that make the job simpler, not harder. A good 6.7 Cummins rear main tool should line up easily and help me install the seal evenly. If a tool is too complicated or awkward to use, it can slow me down and increase the chance of damaging the seal. I always prefer a design that feels intuitive and saves me time.
Compatibility with My Repair Needs
I consider whether I’m doing a one-time repair or regular engine work. If I only need the tool once, I may choose a more affordable option that still gets the job done properly. If I plan to use it often, I’m willing to spend more on a professional-grade tool that offers better durability and precision.
Brand Reputation Helps Me Decide
I usually pay attention to the brand or manufacturer because reputation tells me a lot about what to expect. When other buyers consistently mention good results, I feel more confident in my purchase. I also look for clear product descriptions, warranty support, and customer feedback that confirms the tool works as advertised.
Price vs. Value
I don’t always go for the cheapest option. In my experience, a low price can sometimes mean lower quality or poor fit. Instead, I focus on value—how well the tool performs compared to what I pay for it. A slightly more expensive tool can be worth it if it lasts longer and helps me avoid costly mistakes.
My Final Tip Before Buying
Before I buy, I always double-check the product details, included accessories, and return policy. I want to be sure the tool matches my engine and the type of seal work I’m doing. Taking a few extra minutes to verify everything helps me avoid frustration and makes the repair go much smoother.
Final Thoughts
In my experience, the 6.7 Cummins rear main tool is one of those specialty tools that can make a difficult job much more manageable. I’ve found that using the right tool not only helps protect the rear main seal and surrounding components, but also saves time and reduces frustration during installation. My takeaway is simple: if I want a cleaner, more reliable repair, having the proper rear main tool is well worth it.
Author Profile
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Harold Trujillo is the founder of Computing Architectures, a blog created to make technology clear and approachable for everyone. Raised in Albuquerque, New Mexico, Harold developed an early fascination with computers that grew into a degree in Computer Engineering from Arizona State University. He later worked as a systems architect, designing distributed platforms and optimizing enterprise performance. Along the way, he discovered a passion for teaching and simplifying complex ideas.
Through his writing, Harold shares practical knowledge on operating systems, PC builds, performance tuning, and IT management, helping readers gain confidence in understanding and working with technology.
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