Above is a Dodge 5.9L 12 valve, Was featured on @RiDiesels Instagram page
The 5.9L cummins diesel came in 2 variations the first was the 5.9L cummins 12v or valve introduced in dodge pickups in 1989 and was up until it was replaced by the 24 valve 5.9L cummins in 1998. The 12 valve was an inline 6 cylinder engine that was much better on fuel compared to gas guzzling V8's. This engine was used in light and medium duty pickup and work trucks, as well as agricultural and even construction machinery. A major plus with the engine was that its reduced size and compact made it very indestructible. However a dowel pin in the engine block that overtime could potentially come out of its hole would be a major problem for the motor as it would cause catastrophic engine failure.
The 5.9L 24 valve which was introduced in 1998 had a much higher output of horsepower and reliability. And with the 4 overhauls up until 2007 the motor gained just under 100 horsepower and 150 foot lb of torque. This was also a 6 cylinder motor and was not too problematic until 2007 when the emissions were passed and the 6.7 cummins was introduced.
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