Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4025011)

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.

• You’ll receive a brand new rebuild kit that is manufactured and assembled in an ISO 9001:2008 certified facility. This ensures top-notch quality and consistency.
• If you want to bring your engine to goodworking condition and increase it’s longevity, this is the rebuild kit of your dreams. Plus, you’ll get rod and main bearings crafted with tri-metal material to ensure long lasting strength and durability.
• Give your engine a backbone with piston pins hardened and tempered for improved strength and wear resistance. Less wear is always a plus!
• The sealing products you will get are proudly USA made and use 100% Asbestos-Free Material. If that isn’t enough, the correct materials are used for optimal sealing performance.
• Keep your oil where it needs to be with oil control rings designed with precise tangential tension for proper oil control. These bad boys will keep your oil in check. 
• You’ll have peace of mind knowing the pistons included are CNC turned to precise tolerances and computer control machined to maintain proper clearances. 
• Also, the parts will fit and function properly due to OE specifications being met. You can’t beat that!
• Want to save some cash? We’ve got you covered.Quality meets or exceeds the OE’s at a much lower price. To top it off, all new parts are included and there is no core charge.

Kit Contents

• (1) Oil Pan Gasket
• (1) Lower Thrust Bearing
• (1) Main Bearing
• (1) Gasket
• (6) Connecting Rod Bearings
• (6) Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) Engine Pistons
• (6) Piston Ring Sets
• (1) Oil Piston Ring
• (1) Compression Piston Ring
• (1) Compression Piston Ring
• (6) Connecting Rod Bearings
• (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