Cummins 4B 3.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF40894234B)

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.

• Our inframe rebuild kits are built to OEM specifications giving you quality and consistency your rig needs. Stricter than a Dad with his daughter’s boyfriend!
• Make your diesel great again with this kit from 4BTdiesel! You’ll be restoring your engine with all new parts manufactured and assembled in an ISO 9001:2008 certified facility, ensuring proper fitment and engine function. And with all new parts, you have no core charge. That’s more money in your pocket!
• Let’s talk pistons. The ones in this kit are CNC turned to precise tolerances. That means, you are getting the precision needed for ultimate performance in your rig!
• We all know that one guy with the puddle under his rig. Keep your oil where it is supposed to be with oil control rings designed with precise tangential tension for proper oil control. Don’t be that guy!
• Ever hear of the little engine that could? Thanks to these tri-metal constructed connecting rods and main bearings, he’s still running and racking up the miles!
• Want leak free durability? Excellent performance in functionality? Superior quality in seal ability? Of course you do! And that is what you will get with the Gaskets in this kit made with the correct  materials. You’ll thank us later!
• The sealing products in this kit are proudly made in the USA using 100% asbestos-free materials. I think it speaks for itself.
• Make a wise decision with help from our on hand professionally certified factory mechanics. They are here with all the answers to your tech questions.

Kit Contents:

• (1) Oil Suction Connection Gasket, 
• (1) Oil Pan Gasket
• (4) 1.0mm Piston Kits
• (4) 1.0mm Engine Pistons
• (4) 1.0mm Piston Ring Sets
• (4) Top Piston Rings
• (4) 1.0mm Second Piston Rings
• (4) 1.0mm Oil Rings
• (1) Main Bearing Set
• (4) Top Main Bearings
• (5) Bottom Main Bearings
• (1) Thrust Bearing
• (4) Connecting Rod Bearings
• (4) Connecting Rod Bearings
• (1) Lower Thrust Bearing
• (1) Upper Engine Gasket Set
• (4) O-Ring Seals
• (4) Exhaust Manifold Gaskets
• (1) Cylinder Head Gasket
• (1) Cylinder Head Gasket
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) Rectangular Ring Seal
• (2) Turbo Hose O-Ring Seals
• (2) O-Ring Seals
• (1) Turbocharger Gasket
• (1) Thermostat O-Ring Seal
• (2) Sealing Washers
• (4) O-Ring Seals
• (4) O-Ring Seals
• (1) Turbo Oil Drain Gasket
• (4) Sealing Washers
• (12) O-Ring Seals
• (2) Sealing Washers
• (1) Rocker Lever Housing Gasket
• (4) Noise Isolators
• (1) Ring Seal
• (1) Filler Cap Gasket
• (1) O-Ring Seal
• (1) O-Ring Seal
• (1) Valve Cover Gasket
• (4) Plain (Copper) Washers

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes