Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089421)

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 never lose sleep wondering if you made the right choice with 4BTdiesel!  Our rebuild kits are made to strict OEM specifications giving you equal or better quality compared to the OE, at a much lower price.
• Plus, this brand new rebuild kit is manufactured and assembled in an ISO 2008:9001 certified facility, ensuring proper engine fitment and function.  And since it is brand new, there is no core charge!  Giving you even more coin in your pocket!
• With this kit you will be restoring your engine to good working condition.Extending the life of your rig right into the next generation taking over the family business.
• These piston pins are hardened and tempered for improved strength and wear resistance.  Ever hear of the Little Engine that could?  I heard he had these piston pins and he’s racked up another million miles on that bad boy.
• Nobody likes a mystery puddle under their rig.  Our gaskets are made of  the correct materials giving you excellent performance and leak free durability.
• Think you’re tough?  These tri-metal connecting rod and main bearings are built with durability giving you a run for your money.
• Receive unrelenting power with CNC turned pistons for precise tolerances.  Simply put, quality and consistency you can count on.
• Additionally, the sealing products are proudly made in the USA, using 100% asbestos-free material.  I think this speaks for itself!
• At 4BTdiesel, we know time is money and we want you back up and running as soon as possible.  We have ASE techs on hand to answer all your technical questions.  We’ll make sure you are getting the right parts the first time.

Kit Contents:

• (1) Oil Pan Gasket
• (1) Lower Thrust Bearing
• (1) Main Bearing
• (1) Gasket
• (6) Connecting Rod Bearings
• (6) Connecting Rod Bearings
• (6) Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) 1.0mm Engine Pistons
• (6) 1.0mm Piston Ring Sets
• (6) Top Piston Rings
• (6) 1.0mm Second Piston Rings
• (6) 1.0mm 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