Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089670)

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.

• Ready to restore and extend the life of your engine? Do just that with a brand new rebuild kit built to OEM specifications to fit and work correctly in your rig.
• No need to sacrifice quality! We provide consistent quality by ensuring each kit is manufactured and assembled in an ISO 9001:2008 certified facility.
• 4BTdiesel has got you covered when it comes to longevity! Combine CNC turned pistons with piston pins hardened and tempered for stronger wear resistance, and you’ve got an engine all set to go another million miles!
• Make your diesel great again with American made 100% asbestos-free sealing products!
• Want durability? You’ve got it! Main and rod bearings are produced with tri-metal components to get keep your diesel sturdy over time.
• Leakage? Not here! Keep oil where it needs to be with oil control rings designed with precise tangential tension for maximum oil control. 
• Don’t settle for sub-par parts! It is vital your engine is properly lubricated, so gaskets are made with the correct materials. Rest assured, your rebuild kit has top-notch performance in sealibility.
• Upgrade your engine with improved graded multi-layered steel cylinder head gaskets. For proper replacement, both thicknesses are included with the gasket set.
• Don’t leave you’re pistons to chance! These piston kits utilize complex combustion bowl geometry, keeping your engine cool. Additionally, computer controlled piston machining is put to use to maintain proper clearances.
• Ding ding ding! You’ve just hit a gold mine! For no core charge and a much lower price compared to the OE, you still receive equal or even better quality parts! What’s better than that?

Kit Contents:

• (6) Connecting Rod Bearings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (1) Gasket Flange
• (1) Oil Pan Gasket
• (6) .50mm Piston Kits
• (6) .50mm Engine Pistons
• (6) .50mm Piston Ring Sets
• (6) Top Piston Rings
• (6) .50mm Second Piston Rings
• (6) 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