Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089260)

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.

• Is your engine not making the cut? You’ll receive a brand new rebuild kit that restores your engine to great working condition and keeps you on the road for another million or more miles.
• Let’s make your engine great again. Tri-metal connecting rods and main bearings are included to strengthen your engine against the most extreme conditions. Plus, hardened and tempered piston pins are included to improve strength and wear resistance.
• We put the OE to shame with exceptional quality and consistency. This rebuild kit goes through a strict manufacturing and assembling process at an ISO 9001:2008 certified facility. 
• Plus, our quality is equal or better than the OE’s at a much lower price, keeping more dough in your pocket. Additionally, all new parts are included and there is no core charge. 
• Let’s talk Pistons. You’ll have peace of mind knowing the pistons included are CNC turned to precise tolerances, and are computer control machined to proper clearances. It doesn’t get much better than that!
• Also, the pistons utilize complex combustion bowl geometry to give your engine incredible power when you need it the most. 
• Leakage? Never heard of it. The sealing products within this kit are proudly USA made and use 100% Asbestos-Free material. Additionally, the proper materials are used in the crafting of the gaskets ensure unsurpassed performance in functionality and sealability.
• You’ll get back up and running in no time since all parts are crafted to OEM specifications, giving you the best of fit and function. You can’t beat that!

Kit Contents

• (6) Connecting Rod Bearings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (1) Flange Gasket
• (1) Oil Pan Gasket
• (6) Piston Kits
• (2) Piston Pin Retainers
• (1) Piston Pin
• (1) Engine Piston
• (1) Piston Ring Set
• (1) Oil Piston Ring
• (1) Compression Piston Ring
• (1) Compression Piston Ring
• (1) Upper 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
• (1) Cylinder Head Gasket
• (1) Cylinder Head Gasket
• (2) Lock Plates
• (6) O-Ring Seals
• (1) O-Ring Seal
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) Turbocharger Hose O-Ring Seal
• (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