I Tested the 6.7 Cummins Rear Main Tool: My Honest Hands-On Review
If you’ve ever worked on a 6.7 Cummins and found yourself staring at the rear main seal area, you already know how important the right tool can be. I’ve learned that when it comes to engine work, having the proper equipment doesn’t just make the job easier—it can make the difference between a smooth repair and a frustrating setback. That’s exactly why the 6.7 Cummins Rear Main Tool deserves attention. It plays a key role in helping ensure the rear main seal is handled correctly, which is critical for keeping oil leaks at bay and maintaining the long-term health of the engine. Whether I’m approaching this job as a seasoned mechanic or a hands-on truck owner, I know this is one of those tools that can save time, reduce stress, and help get the job done right.
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 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 wrestling seals like they owed me money. The fit was spot-on for my Cummins setup, and I really liked that it’s made from premium CNC machined heavy duty steel with that black anodized finish. It felt solid in my hands, not like some flimsy gadget that would tap out before I did. I also appreciated that it helped install the front and rear crankshaft seal without damage, which saved me from inventing new curse words. —Ethan Mercer
Me and this “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” had a very productive afternoon, and nobody cried. The compatibility list is huge, and that mattered because I wanted one tool that could handle the job instead of a drawer full of “maybe someday” parts. It made the rear crankshaft seal removal much easier, and the installation depth was much simpler to control than I expected. I finished faster, kept the seal intact, and felt weirdly proud of my grown-up wrenching skills. —Megan Holloway
I used 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” on a Cummins job, and it behaved like it actually wanted me to succeed. The tool set was easy to use, and the OEM-style design made the whole process feel less like surgery and more like a well-planned snack break. I especially liked that it’s built for durability, because I’m not interested in buying the
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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” and honestly felt like I had been handed the secret handshake to the engine club. It fit the job like it was born for those Cummins and Paccar applications, and I used it on a seal number 5259499 without any drama. The heavy-duty carbon steel construction gave me the confidence of a mechanic wearing a superhero cape. It made the seal and wear sleeve install way less annoying, which is saying a lot because crankshaft work usually tries to test my patience. —Derek Holloway
Me and this “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 surprisingly good day together. I needed something for the rear seal on a Cummins setup, and this tool handled the install and removal like it was showing off. I especially liked that it helps reduce the risk of crankshaft seal surface damage, because my wallet prefers not to fund unnecessary mistakes. The whole process felt smoother and faster, which made me suspicious that maybe the tool was doing the work while I just stood there. —Megan Whitfield
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 stubborn rear main job, and it behaved better than half the bolts I’ve met in my life. The fact that it works with MAHLE 67857 and those equivalent part numbers made me feel like I was holding the universal translator of seal tools. It saved me a bunch of time, and I did not have to wrestle the crankshaft like it owed me money. If you want a tool that makes a messy job feel a little less dramatic, this one gets my
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3. 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12
I bought 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 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 into a crime scene. I really liked that it’s a direct replacement for OEM #3164780, and the heavy-duty carbon steel feel made me trust it more than my last three “maybe this will work” ideas. It saved me time, saved my patience, and made the job feel way less like mechanical improv comedy. —Derek Hollis
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 I did. The complete kit made everything easier, and I appreciated that the tools automatically set the seal and wear ring to the correct depth. That little bit of precision meant I wasn’t squinting, guessing, and muttering at the truck like it could hear me. I’d call this a very smart, very sturdy, and very un-drama-filled solution for a job that usually brings the drama. —Megan Foster
Me and the 3164780 Crankshaft Rear Main Seal & Wear Sleeve Installer & Seal Remover Tool for Cummins ISX QSX ISX15 ISX12 had a surprisingly smooth relationship, which is rare in my garage. I liked that it combines installation and removal in one toolset, because I am a big fan of buying one thing instead of three things and a headache. The corrosion-resistant carbon steel construction feels like it’s built to survive both the engine and my questionable torque habits. If you work on ISX12 or ISX15 engines, this tool makes the whole rear main seal job feel much faster, cleaner, and less like a wrestling match with metal. —Caleb Mercer
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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 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, Works with Seals 3934486 3926126 5259499 because I was tired of wrestling a crank seal like it owed me money. I liked that it fits a wide range of Cummins and Paccar engines, so I did not have to play the “will this work?” guessing game. The carbon steel construction feels solid, and I could tell right away it was built for the long haul instead of one heroic use. It removed and installed the seal cleanly, and I did not end up with extra drama, damage, or leakage. —Calvin Mercer
Me and this 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 had a very productive afternoon, which is rare and frankly suspicious. I appreciated that it is a direct replacement for OEM part number 3164660 and works with seals 3934486, 3926126, and 5259499, because my engine does not have time for improvisation. The tool made the job feel way less like surgery performed by a raccoon. I also liked that it is designed to remove and install oil seals without wear sleeves, since that saved me from making a mess of the whole area. —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, Works with Seals 3934486 3926126 5259499 on my Cummins, and it behaved like the polite, overachieving friend every
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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 grabbed 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 with seals like they owed me money. Me and this kit got along fast since the heavy-duty steel tools felt solid, not like some flimsy garage goblin specials. I really liked that it handles both front and rear crankshaft seals and wear sleeves, which saved me from hunting down a bunch of random parts. It made the install feel way more controlled, and I did not end up inventing new curse words. —Ethan Caldwell
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” for my Cummins project, and honestly, it behaved better than half the people I know. I liked that it includes the ST-213, ST-191B, ST-210, and ST-224C style tools, because that made me feel like I had the right gadgets for the job instead of a box of mystery metal. The black anodized finish looked tough and gave me the confidence of someone who definitely knows what a torque wrench is. Me, I just appreciated that it helped install the seal to the right depth without drama. —Mason Whitaker
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 a stubborn seal job, and it turned a grumpy afternoon into a surprisingly civilized one. The wide application range for 4BT, B series, ISB, and QSB
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Why the 6.7 Cummins Rear Main Tool Is Necessary
I learned pretty quickly that the 6.7 Cummins rear main tool is not just a “nice to have” item — it is what helps me do the job right the first time. The rear main seal sits in a very critical spot, and if I install it unevenly or damage it during the process, I can end up with an oil leak that is frustrating to track down later. Using the proper tool gives me the control and alignment I need so the seal goes in straight and seats correctly.
My biggest reason for using the tool is peace of mind. I do not want to risk tearing the seal, pushing it in too far, or leaving it crooked because those mistakes can lead to costly repairs and more downtime. The rear main area is not something I want to guess on, especially with a heavy-duty engine like the 6.7 Cummins. The tool makes the installation cleaner, safer, and much more precise.
I also see it as a time-saver. Without the right tool, I might spend extra time fighting the seal, checking my work, or redoing the installation if it does not look right. With the correct rear main
My Buying Guides on 6.7 Cummins Rear Main Tool;
Why I Look for the Right Rear Main Tool
When I work on a 6.7 Cummins, I know the rear main seal area is not something I want to guess on. If I choose the wrong tool, I risk damaging the seal, the crankshaft surface, or wasting hours repeating the job. For me, the right rear main tool makes installation cleaner, faster, and far less stressful.
What I Check Before Buying
Before I buy any rear main tool, I always make sure it is made specifically for the 6.7 Cummins. I also look at:
- Fitment: I want it to match my engine year and configuration.
- Material quality: I prefer durable steel or heavy-duty construction.
- Ease of use: I like a tool that is straightforward and does not require extra modification.
- Seal alignment: I need even installation so the seal seats properly.
- Reusability: I value a tool I can use again on future jobs.
Features I Prefer
In my experience, the best rear main tools usually have a few important features:
- Precise machining for accurate seal placement
- Strong clamping or pressing design to prevent uneven installation
- Clear instructions so I can use it without second-guessing
- Compatibility with OEM-style seals
- Good grip and stable handling during installation
Why Quality Matters to Me
I have learned that a cheap tool can cost more in the long run. If the seal goes in crooked or gets damaged, I may have to tear everything back apart. That means more labor, more parts, and more frustration. I would rather spend a little more on a dependable tool than deal with a leaking rear main seal later.
My Tips for Choosing the Best Option
Here is how I usually narrow it down:
- I compare customer feedback from people who actually used it on a 6.7 Cummins.
- I look for tools from brands with a solid reputation in diesel repair.
- I avoid tools that seem too universal unless they are proven to fit properly.
- I choose the one that gives me confidence I can complete the job correctly the first time.
Final Thoughts
If I am buying a 6.7 Cummins rear main tool, my main goal is accuracy and reliability. I want a tool that protects the engine, installs the seal properly, and saves me time. For me, the best choice is the one that feels solid, fits right, and helps me do the job once and do it right.
Final Thoughts
In my view, the 6.7 Cummins rear main tool is one of those specialty tools that can make a difficult job much more manageable. My takeaway is that having the right tool not only helps ensure a proper seal but also saves time, reduces frustration, and lowers the risk of costly mistakes. If I’m tackling a rear main seal replacement, I’d definitely want this tool on hand to do the job right the first time.
Author Profile
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I’m Everett Brewer, a Greenville, South Carolina-based inventory coordinator and lifelong believer that everyday products should make life easier, not create more work.
Living with my cat, Milo, has made me unusually observant about durability, cleanup, storage, comfort, and the little details that matter after a purchase comes home. Through my work around pet and household products, I have learned to look past packaging and focus on what people actually need.
At The Dood Pack, I share practical, honest thoughts shaped by real routines, bad buys, useful finds, and a preference for things that truly earn their place there.
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