Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089422)

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.

• Restore and extend the life of your diesel with a brand new Inframe Rebuild Kit built to OEM specifications. Giving you the proper fit and function within your engine to get you back up and running in no time!
• Go the extra mile, or a million extra miles with computer controlled piston machining to help maintain proper clearances. Now that’s quality you can count on.
• Keep oil where it needs to be with oil control rings designed with precise tangential tension for maximum oil control.
• Stop paying ridiculous OE prices. Receive equal or better quality compared to the OE at a much lower cost to you.
• Want sturdiness over time? You got it! Rod and main bearings are constructed with a tri-metal material for durability.
• Know you are driving safely with sealing products made from 100% asbestos-free material and proudly made in the USA.
• Never leave your pistons to chance. The piston kits included are CNC turned to precise tolerances and also consist of piston pins hardened and tempered for improved strength and wear resistance.
• Drive confidently knowing OEM gasket materials are used throughout the rebuild kit for leak free durability.  
• Don’t settle for sub-par parts! 4BTdiesel makes certain your Inframe Rebuild Kit is manufactured and assembled in an ISO 9001:2008 certified facility. Thus, ensuring quality and consistency you can count on.

Kit Contents:

• (1) Oil Pan Gasket
• (1) Lower Thrust Bearing
• (1) Main Bearing
• (1) Gasket
• (6) Connecting Rod Bearings
• (6) Connecting Rod Bearings
• (6) .50mm Piston Kits
• (6) .50mm Engine Pistons
• (6) .50mm Piston Ring Sets
• (6) Top Piston Rings
• (6) .50mm Second Piston Rings
• (6) Oil Rings
• (1) Upper Engine Gasket Set
• (1) 1.25mm Cylinder Head Gasket
• (6) O-Ring Seals
• (1) Thermostat O-Ring Seal
• (12) O-Ring Seals
• (1) O-Ring Seal
• (2) Sealing Washers
• (2) O-Ring Seals
• (1) Turbo Oil Drain Gasket
• (2) O-Ring Seals
• (1) Filler Cap Gasket
• (6) Sealing Washers
• (1) Cylinder Head Gasket
• (1) Turbo O-Ring Seal
• (1) Rocker Lever Housing Gasket
• (1) Valve Cover Gasket
• (6) Noise Isolators
• (6) Exhaust Manifold Gaskets
• (1) Turbocharger Gasket
• (1) Turbocharger Gasket
• (6) Plain Copper Washers

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes