Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF3800838)

Think you know the truth about Aftermarket Rebuild Kits? We’d bet you’d be surprised.
It’s no secret, rebuilding your rig is one of the most labor (and wallet) intensive repairs out there. Sure, you want your engine to last another million miles but you also want the best price; so what should you choose- OEM or Aftermarket? 

When it comes to engine parts, the aftermarket often gets a bad rep. The idea that aftermarket retailers sell cheap parts with zero warranty, delivered in a beat-up box written in another language couldn’t be further from the truth. 4BTdiesel is here to set the record straight; we only sell Rebuild Kits with new parts, zero core charges, and a 6-month warranty. On top of only offering premium quality parts, we also make sure you save up to 50% off OEM prices. So, when it comes to your rebuild, what’s left to want? 

Need a little extra proof? Let’s talk Rebuild Kits.

• Let’s make your rig great again. Getting a brand new rebuild will not only restore your engine to good working condition but also extend the life of it.
• You’ll receive piston pins that are hardened and tempered for improved strength and wear resistance. These are tougher than your average Joe!
• Want durability? You got it! Rod and main bearings are composed of a Tri-Metal material to keep you rolling for another million miles or more.
• Don’t overpay! Quality is equal or superior to the OE’s at a much lower price. Don’t settle for ridiculous OE prices when you can have more jangle in your pocket.
• Adding to the savings, all new parts are included and there is no core charge. That’s sweeter than your Grandma’s apple pie!
• Trust the experts with a Rebuild Kit manufactured and assembled in an ISO 9001:2008 certified facility. Simply put, it’s quality and consistency you can count on.
• Want proper fitment and functionality? We’ve got you covered. This rebuild kit is built to OEM specifications giving you the best of both. 
• Keep oil where it needs to be with Oil Control Rings designed with precise tangential tension for maximum oil control. Your engine will be properly lubricated and ready to go when you need it. Adding onto that, the sealing products included are proudly USA made and are composed of 100% Asbestos-Free Material!
• You’ll sleep soundly knowing the pistons included are CNC turned to precise tolerances making your life easier. To top it off, they are built with long lasting strength and durability for exceptional performance. 
• Additionally, computer controlled piston machining is used to maintain proper clearances, giving you peace of mind.
• Let’s seal the deal. The gaskets included are used with proper materials for maximum sealing performance, keeping your fluids where they need to be. You can’t beat that!

Kit Contents

• (6) Piston Kits
• (6) Piston Pins
• (12) Piston Pin Retainers
• (6) Engine Pistons
• (6) Piston Ring Sets
• (6) Top Rings
• (6) Second Piston Rings
• (6) Oil Control Piston Rings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (6) Connecting Rod Bearings
• (1) Oil Pan Gasket
• (1) Gasket
• (1) Upper Engine Gasket Set
• (2) O-Ring Seals
• (1) Turbo Oil Drain Gasket
• (1) Intake Manifold Gasket
• (5) Isolators
• (12) Valve Stem Seals
• (12) Valve Stem Seals
• (6) Gaskets
• (2) Gaskets
• (1) Turbocharger Gasket
• (1) Cylinder Head Gasket
• (1) Turbocharger Gasket
• (6) O-Ring Seals
• (1) O-Ring Seal
• (1) Sealing Washer
• (2) Turbo Hose O-Ring Seals
• (1) O-Ring Seal
• (1) Valve Cover Gasket

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes