Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089977Q)

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 will never have to worry about getting a sub-par rebuild kit from 4BTdiesel! This kit is built to strict OEM specifications giving you equal or better quality than the OE at a much lower price.
• Since this kit is made with all brand new parts, there is no core charge. That is more coin in your pocket!
• Why sacrifice quality when you don’t have to? This kit is manufactured and assembled in an ISO 9001:2008 certified facility ensuring proper fitment and function. Giving you the quality and consistency that you expect from 4BTdiesel.
• We know that you need your rig running at top performance at all times. By getting a new rebuild kit, you will be restoring your engine to optimal performance, extending the life of it.
• Let’s talk about these pistons. They are CNC turned to precise tolerances giving you the quality and durability that only comes from high quality parts.
• Keep your engine running till the cows come home with piston pins hardened and tempered for improved strength and wear resistance.
• The connecting rod and main bearings in this rebuild kit are crafted with tri-metal for durability. Ya, they are tough!
• No one likes seeing a puddle of fluid under their rig. Included in this kit are oil control rings designed with precise tangential tension for proper oil control. So, you’ll only be worrying about how big the mud puddle is that you’re driving through!
• We don’t like trash and you don’t deserve trash! The gaskets in this kit use the correct materials that give you excellent performance in functionality and seal ability.
• The sealing products in this rebuild kit are proudly made in the USA and use 100% asbestos-free material. I think that speaks for itself.
• Make a wise decision with guidance from our on staff ASE techs. They are on hand to answer all of your technical questions.

Kit Contents:

• (1) Main Bearing
• (6) 1.0mm Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) 1.0mm Engine Pistons
• (6) 1.0mm Piston Ring Set
• (6) Oil Piston Rings
• (6) Compression Piston Rings
• (6) Compression Piston Rings
• (6) Connecting Rod Bearings
• (6) Connecting Rod Bearings
• (1) Oil Pan Gasket
• (1) Flange Gasket
• (1) Upper Engine Gasket Set
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) Turbocharger Gasket
• (1) Exhaust Outlet Connection Gasket
• (6) O-Ring Turbo Hose Seal
• (1) O-Ring Seal
• (6) Injector Seals
• (6) Gaskets
• (1) Intake Manifold Cover Gasket
• (1) Rocker Cover Gasket
• (1) Thermostat Seal
• (12) Valve Stem Seals
• (1) O-Ring Seal
• (1) O-Ring Seal
• (1) Rocker Cover Housing Gasket
• (8) Sealing Washers
• (3) Sealing Washers
• (1) Cylinder Head Gasket
• (2) Sealing Washers
• (2) Gaskets
• (1) O-Ring Seal
• (6) O-Ring Seals
• (6) O-Ring Seals
• (1) Oil Drain Gasket

• Warranty

  6-month warranty.

What Rebuild Kit and Gasket Set Includes