Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089423)

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.

• Get the best of both worlds when you buy from 4BTdiesel! Our rebuild kits are built to OEM specifications providing you equal or better quality than the OE at a much lower cost.
• Since this is a brand new rebuild kit manufactured and assembled in an ISO 2008:9001 certified facility, you will be getting the quality and consistency you demand. Plus, no core charge! That means more money in your pocket!
• Beef up your engine with CNC turned pistons to precise tolerances!
• By using the correct  gasket materials you will have leak free durability and excellent performance in functionality.
• Think your tough? These piston pins are hardened and tempered for improved strength and wear resistance.
• Tri-metal connecting rod and main bearings are used for durability, giving you optimal performance.
• Keep your oil where it belongs! The oil control rings are designed with precise tangential tension for proper oil control.
• The sealing products in this kit are proudly made in the USA using 100% asbestos-free materials. I think that speaks for itself.
• Support from our on site professionally certified factory mechanics can help restore your engine to good working condition and extending the life of it for another million miles.

Kit Contents:

• (1) Oil Pan Gasket
• (1) Lower Thrust Bearing
• (1) Main Bearing
• (1) Gasket
• (6) Connecting Rod Bearings
• (6) 1.0mm Piston Kits
• (6) 1.0mm Engine Pistons
• (6) 1.0mm Piston Ring Sets
• (6) 1.0mm Oil Piston Rings
• (6) 1.0mm Compression Piston Rings
• (6) 1.0mm Compression Piston Rings
• (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