Widely considered one of the best pre-emissions diesels, the 5.9 Cummins succeeded the 5.9 12v and was produced until 2007. Learn about common problems, and performance modifications such as intake manifold upgrades, tuning, and best upgrades.
The 5.9 Cummins was produced in two different variations by Dodge from 1989 until 2007. The first generation, known as the 6BT or 5.9 Cummins 12v, was produced from 1984 until 1998. It produced 160-230hp and 400-440lb-ft. of torque. The ISB 5.9 Cummins 24v entered in mid-year 1998 and was phased out after 2007 for…
The 5.9 Cummins is legendary in the diesel world for many reasons. However, by modern diesel standards it’s a bit lacking in power and torque. Fortunately, the Cummins 5.9L diesel engine has plenty of untapped potential. A few basic mods can truly take it to the next level. Among the best upgrades for the 5.9…
Dodge Ram 5.9 Cummins engines are often regarded as some of the most reliable light truck turbodiesel engines ever. The 12v Cummins, also known as the 6BT, has a legendary reputation for reliability. However, the newer 24v 5.9 (ISB 5.9) Cummins is still an excellent, reliable diesel engine with a few pros of its own….
WARNING Personal injury can result from a fan blade failure. Never pull or pry on the fan. This can damage the fan blade(s) and cause fan failure. NOTE: Rotate the crankshaft by using the engine barring gear. Cooling Fan Inspection A visual inspection of the cooling fan is required daily. Check for cracks, loose rivets, and…
WARNING Do not remove the radiator cap from a hot engine. Wait until the temperature is below 50ºC [120ºF] before removing the pressure cap. Failure to do so can result in personal injury from heated coolant spray or steam. Remove the filler cap slowly to relieve coolant system pressure. NOTE Never use a sealing additive…
The Cummins “53” Block was used in Cummins 24 valve ISB diesel engines from 1998.5-2002. Manufactured by Brazilian company, TUPY. The “53” block casting has thin water jacket walls that are susceptible to cracking. With coolant cavitation, corrosion, coolant pressure in the block, frequent or heavy towing they may crack, causing a loss of coolant. Failing to…
The Cummins 5.9L “B-Series” diesel engine was produced from 1984 up until 2007. First generation versions were named the 6BT but also commonly referred to as the 12v, or 12-valve. Each cylinder had 2 valves, hence the name 12-valve. Midway through 1998, the 6BT was replaced with the ISB, which stands for “Interact System B”….
