|

5.9 12 Valve Cummins Diesel – Adjust Idle Speed

Correct Idle speed is: Automatic Transmission – in drive with AC on 750-800 RPM Manual Tansmission – in neutral with AC on 750-800 RPM NOTE: These speeds may cause stalling when the engine is cold. If this is occurs, adjust the idle speed to 900 RPM. The dash tachometer is not accurate enough for proper adjustment….

|

Cummins Diesel 5.9 Engines – Killer Dowel Pin

5.9 12v Cummins Killer Dowel Pin Problems The 5.9L Cummins 12-valve diesel engines, manufactured between 1988 and 1998, feature a steel dowel pin that locates the front timing gearcase. Over time, this steel dowel pin can wobble out due to the constant heat cycles and vibrations of the engine. If (or when) the dowel pin works its…

Cooling Fan Inspection
| | |

Cooling Fan Inspection

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…

Coolant Level Check
| | |

Coolant Level Check

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…

Check / Replace Fuel Return Overflow Valve
|

Check / Replace Fuel Return Overflow Valve

The Bosch VP44 Injection Pump Overflow Valve is located on the side of the Cummins injection pump. It is also used to connect the fuel return line (banjo fitting) to the fuel injection pump. Bosch VP44 Injection Pump Symptoms Fuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump…

Cummins Diesel 5.9 Liter B Series Engines
|

Cummins Diesel 5.9 Liter B Series Engines

The Cummins Diesel 5.9 liter Engine 6BT, aka the Cummins “12-valve” was the first member of the “B” engine family to be used in a light truck vehicle. The 6BT used Robert Bosch GmbH fuel systems, injector, and VE rotary pump and P7100 inline injection pumps. Some early 6BT’s were supplied with CAV rotary pumps…

5.9 Cummins 24V Diesel Engine: 53 Block Problems
| |

5.9 Cummins 24V Diesel Engine: 53 Block Problems

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 4 Most Common Cummins 5.9L Engine Problems
|

The 4 Most Common Cummins 5.9L Engine Problems

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”….

Cummins P1693 Engine Code – Diagnosis & Troubleshooting

Cummins P1693 Engine Code – Diagnosis & Troubleshooting

If you Google P1693, you will probably see something that reads “Turbo Charge Control Circuit Malfunction”. However, on Cummins turbo diesel engines, this code has nothing to do with the turbocharger.  P1693 is considered the “companion code”. It is triggered when the powertrain control module (PCM) detects a code that us not actually associated with the…