How to Fix Low Oil Pressure on a 2016 Cascadia Truck

If you own a 2016 Cascadia truck with a Detroit DD15 engine, you may have noticed that your oil pressure is lower than usual. This can be a sign of a common problem that affects these engines: the oil pump rings get hardened and start to leak air, reducing the oil flow and pressure. Fortunately, this is not a very difficult or expensive fix, and you can do it yourself with some basic tools and skills. In this article, I will show you how to change the oil pump rings and do a full oil change on your 2016 Cascadia truck.

What You Will Need

To complete this job, you will need the following items:

  • A jack and jack stands to lift the front axle of the truck
  • A drain pan and a drain valve to drain the old oil
  • A socket wrench and a torque wrench to remove and tighten the bolts
  • A new oil filter and 11 gallons of 15W-40 Shell Rotella synthetic blend oil
  • A new oil pan gasket and five new oil pump rings
  • A rag and some brake cleaner to clean the oil pan and the oil pump
  • Some gloves and safety glasses to protect your hands and eyes

Step 1: Drain the Old Oil

The first step is to drain the old oil from the engine. To do this, you need to locate the drain valve on the bottom of the oil pan. The drain valve is a plastic device that you can press in to release the oil. There is no bolt or plug to remove, so you don’t need any tools for this step. However, you do need a large drain pan to catch the oil, as it will come out fast and furious. Make sure the drain pan is big enough to hold at least 11 gallons of oil.

To drain the oil, simply press the drain valve in and let the oil flow out. Be careful not to burn yourself, as the oil may be hot. Also, make sure the drain pan is positioned correctly, as the oil may spray out at an angle. Let the oil drain completely, then close the drain valve.

Step 2: Remove the Oil Pan

The next step is to remove the oil pan from the engine. To do this, you need to lift the front axle of the truck, so that you have enough clearance to slide the oil pan out. You can use a jack and jack stands to lift the axle, or you can use a lift if you have access to one. Make sure the truck is secure and stable before you crawl under it.

Once the truck is lifted, you need to remove the bolts that hold the oil pan to the engine block. There are 24 bolts in total, and you need a socket wrench to remove them. Loosen the bolts gradually and evenly, starting from the corners and working your way to the center. As you remove the bolts, keep track of them and their locations, as they are not all the same size and length.

After you remove all the bolts, you can pull the oil pan out. You may need to wiggle it a bit to break the seal of the old gasket. Be careful not to damage the oil pan or the oil pump, as they are made of plastic and can crack easily. Also, be prepared for some oil to spill out, as there may be some oil left in the pan.

Step 3: Change the Oil Pump Rings

The third step is to change the oil pump rings on the oil pump. The oil pump is a plastic device that is attached to the engine block, and it has two pipes that connect it to the oil pan. The pipes have seals at the ends, which are the oil pump rings. These rings are rubber o-rings that prevent air from entering the oil pump, which can cause low oil pressure. Over time, these rings can get hardened and cracked, and they need to be replaced.

To change the oil pump rings, you need to remove the pipes from the oil pump and the oil pan. The pipes are held in place by clips, which you can pry off with a screwdriver. Then, you can pull the pipes out of their sockets. You may need to use some force, as the pipes may be stuck. Be careful not to break the pipes or the sockets, as they are plastic and fragile.

Once you remove the pipes, you can see the old oil pump rings on the ends of the pipes and the sockets. You need to remove the old rings and replace them with new ones. The new rings are different sizes, depending on the pipe and the socket. There are two large rings for the large pipe, and three small rings for the small pipe. Make sure you use the right size for each end.

To remove the old rings, you can use a pick or a small screwdriver to pry them off. Then, you can slide the new rings on the ends of the pipes and the sockets. Make sure the rings are seated properly and evenly, and that they are not twisted or pinched. The new rings should fit snugly and securely, and they should not leak air.

Step 4: Install the Oil Pan

The fourth step is to install the oil pan back on the engine. To do this, you need to reverse the process of removing it. First, you need to clean the oil pan and the oil pump with a rag and some brake cleaner. Make sure there is no dirt, debris, or old gasket material on the surfaces. Then, you need to install the new oil pan gasket on the oil pan. The gasket is a thin metal sheet that has holes for the bolts and the pipes. Make sure the gasket is aligned correctly and that it covers the entire edge of the oil pan.

Next, you need to connect the pipes to the oil pump and the oil pan. To do this, you need to align the pipes with their sockets and push them in until they click. You should hear a snap when the pipes are locked in place. Then, you need to secure the pipes with the clips that you removed earlier. Make sure the clips are tight and that the pipes are not loose or leaking.

Finally, you need to attach the oil pan to the engine block with the bolts that you removed earlier. To do this, you need to slide the oil pan under the engine and align it with the holes on the block. Then, you need to insert the bolts and tighten them with a torque wrench. You should follow the torque specifications and the tightening sequence for your engine model, which you can find in your owner’s manual or online. Generally, you should start from the center and work your way to the corners, and tighten the bolts in a crisscross pattern. You should not over-tighten or under-tighten the bolts, as this can cause leaks or damage.

Step 5: Change the Oil Filter and Fill the Oil

The fifth and final step is to change the oil filter and fill the oil. To do this, you need to locate the oil filter on the side of the engine. The oil filter is a metal cylinder that has a cap on top. You need to remove the cap and the old filter with a wrench, and replace them with a new filter and cap. Make sure the new filter and cap are compatible with your engine model, and that they are tight and secure.

Then, you need to fill the oil in the engine. To do this, you need to locate the oil filler cap on the top of the engine. The oil filler cap is a plastic cap that has a symbol of an oil can on it. You need to remove the cap and pour the new oil in the engine. You should use 15W-40 Shell Rotella synthetic blend oil, which is recommended for your engine model. You should use 11 gallons of oil, which is the capacity of your engine. You can use a funnel to avoid spills, and a dipstick to check the oil level. Make sure the oil level is between the minimum and maximum marks on the dipstick, and that the oil is clean and clear.

After you fill the oil, you need to replace the oil filler cap and start the engine. You should let the engine run for a few minutes, and check for any leaks or noises. You should also check the oil pressure gauge on the dashboard, and make sure it is within the normal range. If everything is fine, you have successfully completed the job. If not, you may need to troubleshoot the problem or seek professional help.

Conclusion

Changing the oil pump rings and doing a full oil change on your 2016 Cascadia truck is not a very hard or expensive job, and you can do it yourself with some basic tools and skills. By following these steps, you can fix the low oil pressure problem and improve the performance and longevity of your engine. You should do this job every 35,000 to 40,000 miles, or whenever you notice a drop in oil pressure. This will help you keep your truck in good shape and save you money and time in the long run.

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