Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089671)

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.

• Sick of your engine being on the fritz? With a new rebuild kit you can restore your engine to top-notch working condition, while also extending the life of it. 
• Your kit is manufactured and assembled in an ISO 9001:2008 certified facility. In other words, we can ensure you will receive quality and consistency to depend on.
• Get more bang for your buck! Receive brand new parts of equal or better quality compared to the OE, for a much lower price and no core charge! 
• Giving you both correct fit and function, all components of your Inframe Rebuild kit are made to OEM specifications. It’s the best of both worlds. 
• Want durability? You’ve got it! Make your engine sturdy over time with tri-metal constructed main and rod bearings made to get you another million miles! 
• Made in the USA? You got it! Sealing products are American made from 100% asbestos-free material.
• Sleep soundly knowing the correct materials have been used to make certain gaskets will keep fluids where they need to be. Additionally, these include both thicknesses of the enhanced graded multilayered cylinder head gaskets for proper replacement.
• Don’t settle for sub-par parts. These pistons will beef up your engine by utilizing complex combustion bowl geometry keeping your engine cool.
• Keep the power in horsepower with pistons that are CNC turned to precise tolerances and computer controlled machining to maintain proper clearances!
• Oil leakage? Never heard of it. Oil control rings have been designed specifically with precise tangential tension to keep the proper control of oil within your engine.
• Let us help fortify your cylinders with piston pins hardened and tempered for improved strength and wear resistance. They’re tougher than your average Joe!

Kit Contents:

• (6) Connecting Rod Bearings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (1) Flange Gasket
• (1) Oil Pan Gasket
• (6) 1.0mm Piston Kits
• (6) 1.0mm Engine Pistons
• (6) 1.0m Piston Ring Sets
• (6) Top Piston Rings
• (6) 1.00mm Second Piston Rings
• (6) 1.00mm Oil Rings
• (6) Piston Pins
• (12) Piston Pin Retainers
• (1) Upper Engine Gasket Set
• (1) Breather Mounting Seal
• (3) Sealing Washers
• (6) Gaskets
• (1) Intake Manifold Cover Gasket
• (6) O-Ring Seals
• (2) Gaskets
• (1) Oil Drain Gasket
• (1) Turbocharger Gasket
• (1) Rocker Cover Gasket
• (1) Thermostat Seal
• (1) Rocker Cover Housing Gasket
• (6) O-Ring Seals
• (12) Valve Stem Seals
• (12) Valve Stem Seals
• (2) Lock Plates
• (6) O-Ring Seals
• (1) Cylinder Head Gasket
• (1) Cylinder Head Gasket
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) Turbo Hose O-Ring Seals
• (1) O-Ring Seal
• (11) Sealing Washers
• (6) Mid Range XPI Injector Seals
• (6) Exhaust Manifold Gaskets

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes