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Category Archives: Cummins 4BT and 6BT Issues

10 Common Problems With Diesel Engines

By Featured Writer Mike McGlothlin For the most part, diesel long-blocks are pretty solid, with rigid components like forged-steel crankshafts and connecting rods, mammoth-sized wrist pins, rod bearings, and main bearings, gear-driven accessories, and densely-cast gray-iron blocks proving nearly unbreakable. Sure there are freak instances of dropped valves, bent rods, and cracked blocks, but…

How To Test and Service Your Cummins Injectors

By Featured Writer: Mike McGlothlin Despite how durable the mechanical fuel injectors are in the ’89-’02 5.9L Cummins engines, they’re still a wear item. That means that even though this ultra-simple, single-shot injectors are known to last 400,000 miles or more, eventually they’ll need to be serviced. Whether the owner notices a change in performance,…

P7100 Fuel Pump Modifications for the 8 Valve 4BT

4BT Engine History and Background The Cummins 4BT has mostly been utilized in applications such as box trucks, small industrial vehicles and agricultural equipment. The 4BT is pretty much just a downsized version of the famous 5.9L 12V Cummins as these engines share almost all of their parts such as pistons, connecting rods, injectors and…

Is the Cummins 12 Valve 5.9L the Best Diesel Ever Built?

Early 5.9L Engine History Weighing in at 1,100 pounds this heavyweight was brought to market under the hood of the Dodge Ram in 1989. It was originally designed to power agricultural vehicles 8 years earlier and in fact was the brainchild of a Case/Cummins joint venture. The engine marketed as the 6B, 6BT, and 6BTAA…

Best 4BT Swap Transmisson Review: New Venture NV4500

NV4500 History The NV4500 and consequently the NV5600 transmissions are some of the best that have ever been produced for heavy duty trucks. These transmissions are regarded as the “gold standard” for guys doing a Jeep or Bronco 4BT Engine Swap. The NV4500 came into existence out of sheer necessity. From 1989-1993 Chrysler used the…

Common 4BT / 6BT Issues The Cummins 4BT and 6BT engines are widely known to be bulletproof. If there is an engine out there that old school guys always go to is the older mechanical 4BT Cummins. The reason these engines are still used in industrial and jeep swap applications is due to their reliability.…