Is there a coolant leak in my Cummins ISM?
BTW, odometer shows only 36,000 miles. It may have a leak when its hot. Test it at normal running temps. Welcome to the Forum. I see that you did replace the cap and the system pressured tested OK.
Is it OK to mix Cummins coolant with Blue Bird?
Cummins has published Technical Bulletin TB03/05-2 entitled “Compatibility of Fleetguard Coolants and SCAs with competitor Products “(attached). Although it is acceptable to mix any of the Fleetguard coolants listed below in a Cummins engine in a Blue Bird chassis, Blue Bird recommends that mixing be avoided if at all possible.
What is the coolant standard for Cummins engines?
Therefore, a new Cummins Engineering Standard, Cummins Engineering Standard 14603, has been developed to make sure coolant used in Cummins® engines will meet the requirements of all engine components. See Attachment 2 for more information on Cummins Engineering Standard 14603.
What kind of engine does a Cummins 5.9 have?
Here is our article on Cummins 5.9 12v engine problems. The ISB 5.9 featured an inline-6 cylinder engine with multi-valve pushrods, and 4 valves per cylinder. Therefore, the Cummins ISB 5.9 is also commonly known as the 24v, or 24-valve.
BTW, odometer shows only 36,000 miles. It may have a leak when its hot. Test it at normal running temps. Welcome to the Forum. I see that you did replace the cap and the system pressured tested OK.
Here is our article on Cummins 5.9 12v engine problems. The ISB 5.9 featured an inline-6 cylinder engine with multi-valve pushrods, and 4 valves per cylinder. Therefore, the Cummins ISB 5.9 is also commonly known as the 24v, or 24-valve.
What kind of problems does a Cummins 24V have?
4 Most Common Cummins 24v 5.9L Engine Problems 1 Fuel Lift Pump Failure 2 Leaking Fuel Injectors 3 Exhaust Manifold Leaks 4 Accelerator Pedal Position Sensor Failure 5 Bonus: Engine Block #53 Cracking
What causes an exhaust manifold to crack on a Cummins 5.9L?
While the block will only expand by a fraction of an inch, the constant expansion and contraction causes a lot of stress on the exhaust manifold. As a result, the manifold (also made of cast iron) can crack. When the manifold cracks air leaks out, pressure is lost, and the engine loses vacuum.
