Skip to Content

Cummins ISM Problems and Issues

The Detroit series 60 engine and Cummins ISM were both reliable engines but they had their share of issues and problems. Often, these problems were attributed to the EGR (Exhaust Gas Recirculation) valve. In these cases, troubleshooting required clearing codes to determine the problem. In most cases, replacing the valve or installing another was enough to fix the problem. There were also issues with dropped valves and timing.

Camshaft flattening

If you own a Cummins ISM or ISMX engine, you’ve likely had camshaft issues. Typically, this is due to the rocker arms, which can smack against the cam lobes. This causes the engine to malfunction, blow, or suffer other significant damages. The only way to know if you’re experiencing these problems is to examine your engine. If you notice that the engine has a sudden change in performance, it may be time to replace the camshaft. To fix this problem, you’ll need to replace both the rockers and the camshaft. Professionals can replace both the rockers and camshaft for you.

Flattening occurs when the rocker arms fail to provide the right amount of oil to the camshaft, resulting in lobe flattening and a reduced performance. Replace the rocker arms and camshaft with a brand new set to fix the performance problem. Replacement of the rocker arms will prevent the camshaft from flattening again. However, it may be difficult to diagnose the problem before your performance begins to deteriorate.

The Cummins ISX engine underwent a major redesign in 2010 to meet EPA emissions standards. It was also the first Cummins engine to use the new common rail fuel system. The common rail fuel system eliminates the injector camshaft and uses multiple piston pumps to distribute diesel fuel in a rail system. This allows extreme pressures to reach 35,000 pounds per square inch. The result is a more efficient engine.

Rocker arm flattening

A faulty rocker arm can result in a variety of engine problems, including a sluggish start, erratic acceleration, and low power. However, a broken rocker arm is not the root of the problem. A damaged rocker arm can cause performance problems that are difficult to diagnose. To remedy the problem, replace the rocker arm and camshaft together. However, a new rocker arm will help prevent flattening of the camshaft.

Another common problem with ISX engines is the rocker arms. Faulty rocker arms are what starve other components, such as the camshaft, of oil and can result in flat cam lobes. This problem can be difficult to diagnose until performance suffers, which is why you should always seek professional help. If you suspect that your rocker arm is flattening, you should change both of them.

Dropped valves

When your Cummins ISX suffers from dropped valves, you should have the engine looked at by a professional. Dropped valves can happen for many reasons, including a variety of wear and tear. The valve itself can also be faulty, but in most cases it will be easy to fix yourself. Here are some ways to repair dropped valves on your Cummins ISX. The first step is to inspect the cylinder for damage. Then, replace the valve if necessary.

In some cases, you may need to replace the entire engine, but a refreshment is a much cheaper option. Dropped valves on a Cummins ISM are easily fixed by an experienced mechanic, but the engine replacement will depend on time, cost, and availability of spare parts. If you are fortunate to catch the problem early, however, you can save your motorhome from major damage by repairing the problem yourself.

Timing problems

A Cummins ISM engine can keep your motorhome running smoothly even after long journeys. However, it does have some common problems. If you’re able to detect the problem early enough, you can resolve it before traveling. Below are some of the most common problems and their solutions. Read on to learn how to repair your Cummins ISM. When the engine runs slowly, the problem may be a timing problem.

The ISM engine uses a dry PTO shaft for the air compressor, which is not lubricated with engine oil. Additionally, the rear takeoff is not located in the timing cover but inside the bell housing. The sealed bearings inside can fail even after several years of use, which makes the replacement process a time-consuming and expensive one. This problem is not uncommon for Cummins engines, and if it does happen, you need to replace the entire rear takeoff.

Fuel economy

The Cummins ISM engine is among the most advanced heavy-duty diesels on the market. Its performance and durability have been extensively tested, and it meets the latest emissions requirements without expensive aftertreatment or special fuels. The Cummins ISM is also one of the most reliable, and offers impressive fuel savings. The engine is highly sophisticated, and features advanced air-handling technology and an electronically controlled fuel system to improve fuel economy and performance.

The Cummins ISX has typical EGR problems, and a faulty EGR valve is a common culprit. While the cause may be as simple as a faulty EGR valve, this problem can compound over time and be difficult to diagnose. The following are the most common fuel economy problems with Cummins ISX engines. Let’s take a closer look at each. The first symptom you should look for is a black smoke. This symptom indicates that there is an imbalance between the air and the fuel. The fuel system is delivering too little air or too much fuel.