Exploring The GM Duramax High Pressure Oil Pump

The oil pump in a GM Duramax engine draws lubricant from the pan and sends it flowing around the briskly moving internals. The oil travels through specially designed passageways called oil galleries. The purpose of the oil is to cool down the moving parts and keep friction to a minimum. A properly working high-pressure pump will keep engine internals alive and functioning correctly for several hundred thousand miles.

Components and Functions

The inside of the oil pump is a simple mix of gears, bolts, nuts and an outer casing. Since the pump sits in the lubricant filled oil pan, there is little chance of rust or corrosion weakening the metal outer case. A high-pressure oil pump uses drive gears to create pressure in the system. The pressure pulls oil up out of the pan at the bottom of the engine and sends it clear up to the heads up top.

Common Problems

The GM engine requires frequent oil changes to keep the fluid from thickening and clogging up the lines. When the oil filter goes bad, it could release dirt and metal shavings collected from the engine into the oil pan reservoir. If this happens, the high-pressure pump will suck up these contaminants and send them back through the oil galleries. When quick moving internal components do not receive the proper amount of oil, the parts could overheat or seize together. The result is a loss of power or an engine that will not even crank over.

If the pump sucks up any substantial contaminants, the teeth on the pump’s gears could snap right off. The broken teeth reduce the pump’s ability to send oil through the system, resulting in sudden fluid starvation. Furthermore, the teeth could jam into the remainder of the moving gears and stop the pump altogether. Once the pump stops working, the GM vehicle will send a fault warning to the dash lights to alert the driver. The engine must be switched off at once to protect the rest of the internals from costly damage.

Dodge Cummins – Don’t underestimate the importance of a high pressure oil pump

The Dodge Cummins is a strong and reliable engine that has a reputation for being a mighty work-horse. This engine, like most, require that the oil pump function properly and deliver the right type of pressure to deliver oil across the engine. When the pump is not function or pressure is not at optimum levels it can cause major problems to the engine. There are some typical signs to be aware of when the oil pump is not operating correctly.

Like with many issues going on in the car, a service engine light will activate when the pressure is not high enough. Hopefully you do not fall in the category of a driver that ignores that light, and places duck tape over it. A low pressure alert could mean that your engine is leaking oil or burning oil at a faster rate than necessary. This reduction in pressure means that oil will not lubricate the vehicle appropriately. This could lead to issues like over heating that can destroy the engine if left unchecked.

It is always important that the driver be aware of the sounds and feel of the drive. In many cases, when the oil pump is not working well the care begins to make a noise or the vehicle is just not driving a smoothly as it once did – each are reason to check the oil pump. The Dodge Cummins are tough engines and require that the oil pressure be high enough to deliver oil to the engine bearings as well as insure the car starts properly. If you are noticing a cranky start and might be a pressure issue that is not necessary a bad starter in the car.

The importance of a high pressure oil pump in the Dodge Cummins engine should never be underestimated. This is an integral device and functionality to the car, responsible for several vital systems working correctly. Just like the human body, in an engine all the parts rely on one another to keep the whole working well. There is no part that deserves to be ignored, especially the high pressure oil pump. Make sure to always check your oil as the engine ages to make sure you are not loosing oil through a leak, these changes in pressure will cause larger issues. As parts do not receive the correct lubrication friction and heat build to erode parts and function quickly.high pressure oil pump in the Dodge Cummins engine should never be underestimated. This is an integral device and functionality to the car, responsible for several vital systems working correctly. Just like the human body, in an engine all the parts rely on one another to keep the whole working well. There is no part that deserves to be ignored, especially the high pressure oil pump. Make sure to always check your oil as the engine ages to make sure you are not loosing oil through a leak, these changes in pressure will cause larger issues. As parts do not receive the correct lubrication friction and heat build to erode parts and function quickly.

Be sure to keep your Dodge Cummins engine happy and keep track of your oil pressure at all times.


3 Benefits Of A High Pressure Oil Pump In A Duramax

General Motor’s 6.6-liter Duramax diesel engine greatly benefits from the inclusion of a high-pressure oil pump in the lower pan. The sheer size of this engine demands the use of pressure to push heavy oil through the system. Otherwise, the engine would suffer from poor flow that could lead to overheating, which in turn, damages the bearings and other internal components. Read on to learn about the benefits of including a high-pressure oil pump in the build.

Improves Lubricant Flow

The oil pump pulls lubricant from the reservoir and feeds it through the galleys to send fluids throughout the entire engine. Since the moving internal parts rotate at several thousand RPMs, it’s important for them to maintain a layer of lubricant.

If the oil pump cannot transport the fluid into the entire engine, internal parts will wear down incredibly quickly. A high-pressure pump makes sure the oil shoots all the way through the engine to the heads at the top. This keeps everything from the crank to the camshafts in perfect shape.

Reduces Heat Production

Oil reduces friction between moving parts by lubricating their external surfaces. Reduced friction allows the engine to operate at a lower temperature, which protects both moving and stationary parts inside the engine.

If oil sits at a high temperature for an extended period of time, the seals and gaskets could fail prematurely. Furthermore, sensitive metal parts, such as the aluminum heads, could warp out of shape from the high temperatures. A high-pressure oil pump quickly cools the oil and sends it back through the engine for another pass.

Extends Bearing Life

The Duramax engine uses a series of bearings to support rotating parts, such as the crank and camshafts. These bearings are made out of a thin piece of metal that sits in the supportive cutout in the block and head. In the center of each bearing is a small oil galley that allows lubricant to shoot through onto the bearing surface to reduce wear on the moving parts.

If the bearings wear too early, the rotating parts could end up gouged or even warped. The high-pressure pump ensures all of the bearings receive an equal amount of lubricant to keep the metal from wearing away prematurely.

In the end, the oil pump protects the Duramax engine in so many ways; it’s hard to imagine this build without it.

How to Fix Leaking HPOP Hose

In many cases, the cause of a leaking high pressure oil pump (HPOP) hose can be traced back to faulty O-rings. Typically, most DIY mechanics can complete this job in a two or three hours. Start by buying either the appropriate O-rings for your vehicle or a kit that contains the O-rings from the manufacturer.

Make Things Easier for Yourself

Since space in tight under the hood, it pays to do whatever you can to make things easier. Though some people have repaired a leaking hose while it is still attached, it is much easier to remove it from the vehicle. In addition, short and stubby wrenches can seem like an unnecessary expense, but they make maneuvering in tight spaces much easier and well worth it if you have large hands.

Completing the Repair

You will find two connections at either end of the hose. Remove those and the job will be much easier to complete. Move the wire that is there gently aside. Using a tool that fits the opening, remove the lines so that you can access the hose. Use the stubby sockets to remove the fittings.

Precision is the Key

Once you have access to the springs, use the longest needle-nose pliers you have to gently remove them. Then remove the plug that rests at the back of the hose. Remove the old O-rings and pop on the new ones. It is important that the springs go back into the pump with their caps first. Make sure that the oil lines are snapped on tightly when you put them back on.


What’s an HPOP Hose Used For?

An HPOP hose transports engine from the HPOP to the engine to lubricate things like the engine’s bearings, pistons, and camshaft. HPOP stands for high pressure oil pump and is often used instead of a standard pump for those that want to replace iol in their engine at a faster rate.

A high pressure oil pump hose is specifically designed to accomodate the higher pressure of the engine pump. Using a standard hose with a high pressure oil pump could lead to serious problems, such as a hose rupture. The hoses are connected to both the high pressure oil pump and the engine rails using special fittings that should allow for an easy disconnection in the future.

Each high pressure oil pump has two hoses, one on the driver side and one on the passenger side. The hose on the driver side is connected to the forward fitting on the high pressure oil pump. The passenger side hose is connected to the aft fitting. The other ends of the hoses are then connected to fittings on the cylinder head.

If a person believes their oil pump is operating with less pressure than it should, they could test the connections of the HPOP hose to the fittings. Gently pulling on the HPOP hose will indicate whether the hose is completely connected. The hose shouldn’t come free. If it does, then it hasn’t been installed correctly.

How to Install a HPOP Harness Upgrade

Follow the instructions below to install a HPOP harness upgrade.

  1. Battery disconnection: do not reconnect until complete to avoid fire or shocking risks.
  2. Follow instructions for installation of Electronic Signal Processor (ESP) and harness.
  3. Connection of the Temperature Harness and ESP harness instructions:
    1. Remove plugs from sections 4 and 5 in brown connector D of the ESP.
    2. Use needle nose pliers to pull the orange wedge lock from connector D.
    3. Insert black terminal wire into section 4 of connector D, push until it snaps into place.
    4. Insert green terminal wire into section 5 of connector D, push until it snaps into place.
    5. Note: when fully seated, the terminals will close flush with the top of connector.
    6. Pull firm on wires to confirm if properly seated.
    7. Push orange wedge-lock into its original position.
    8. Reconnect the brown D connector to the ESP.
  4. Look for the factory ICP (injection control pressure) sensor and disconnect it from its harness.
  5. Route the ISSPRO HPOP Harness toward the sensor. Plug the harness into the ICP sensor, and then plug the truck harness connector into the last connection of the HPOP harness.
  6. For those installing power adding modules to the ICP sensor, connect the ISSPRO HPOP Harness right to the ICP sensor, then connect the truck’s harness between the module’s harness.
  7. Connect the HPOP pressure gauge on to the ESP by following the ESP instructions about how to do this. NOTE: if you are drilling a hole for mounting the gauge, the size of the hole should be 2.040″.
  8. Make sure all the wire is secure and that no sharp edges or moving parts will cause chaffing. This is possible by routing wires through the factory provided wiring harness sheath, using wire ties, and sheaths, and using grommets that are appropriate when making passage through the firewall.

The Importance of Proper Maintenance in High Pressure Oil Pumps

Ford Super Duty trucks care PowerStroke engines. These engines can also be found in the likes of the Ford Excursion SUVs and in Ford Econoline vans, as well as a few other Ford products. They are internal combustion engines that rely on high pressure oil pumps to help keep them running properly.
An oil pump is used in any internal combustion engine to keep the oil circulating. Operating under pressure, it consistently sends oil to parts of the engine; including the rotating bearings, sliding pistons, and the camshaft. These parts need the lubrication in order to run properly. Without it the friction from rubbing parts would create too much heat.
Speaking of heat, not only does the oil pump help keep the engine working by providing constant lubrication, but it also helps to keep the engine cool. Therefore, it is extremely important to maintain a working oil pump and to keep the indicated amount of oil in the engine. If the oil level is too low, or if the oil pump fails the rest of the engine will eventually fail as well.
Aside from having to replace a leaking oil pump, the maintenance of oil is relatively easy. Simply keep a check on how much oil is in the engine, and fill it up with more oil as it runs low. Also, remember to completely change out the oil about every 7,500 miles to every 10,000. Take care of your high pressure oil pump, and your car engine will take care of you.

What Does A High Pressure Oil Pump Do?

When Ford Motor Company says something is “Built Ford Tough” they mean it, and that’s why a high pressure oil pump is an essential part of the Ford Power Stroke engine. There is an oil pump in every engine, and its job is to circulate the oil throughout the engine. Essentially, it moves through the rotating bearings, the sliding pistons and the camshaft portion of the engine. There are three important functions that the high pressure oil pump has in the Ford Power Stroke engine.

  1. The high pressure oil pump fires at such a high pressure so that the fuel injectors are able to fire. This was introduced on the 1994-1997 line of Ford trucks with Power Stroke engines.
  2. The high pressure oil pump is primarily used as lubricant for the entire engine but it has been found to serve additional purposes in the Ford trucks, including as a hydraulic fluid that helps to run small actuators within the engine as well.
  3. In recent years, the high pressure oil pump has also been used for a variety of other things including: as a tensioner for a timing belt, a tensioner for variators and a tensioner for variable valve timing systems.

The HPOP is a key component in a strong engine designed to help big vehicles have a long lifetime on the road. The high pressure oil pump is known as one of the best parts of the Power Stroke engine, which is built into many different Ford model trucks. It keeps the engine running good and extends the life of the engine by years, and has proven over time to provide a variety of different positive benefits to the truck itself. This is just one reason that Ford has continued to use the pump in its Power Stroke engine.

HPOP Purpose

High Performance Oil Pump, or HPOP for short, is required to pump oil in and around Ford Motor Company’s Powerstroke diesel truck engines. It is the only type of pump that can supply enough pressure to get the oil into every area of the engine it needs to go. Without it most Powerstroke engines would be useless and unable to move or function. Combustion engines, running on diesel fuel, need a lot of oil delivered to the pistons so they don’t overheat and lock up. A heavy duty truck engine is always in danger of freezing up if not enough oil is in the engine.

The HPOP not only delivers oil to the engine’s moving parts, but also monitors the pressure it’s using as it delivers the oil. The amount of oil remaining and any necessary refills is monitored too. When the engine light goes on, the HPOP may be reporting a drop in the amount of oil remaining, or it may be reporting something more serious such as the lack of pressure inside the engine. Not enough pressure means not enough lubrication of the entire system, and that’s just plain bad. Oil leaks decrease the pressure too, because there are small holes in the oil delivery system.

What’s worse is an oil pump that can’t deliver the oil fast enough. Air bubbles can form in the oil pump lines and air bubbles in the engine create havoc because there’s really no way to expel the air bubbles from the engine once they are in. Using a 0w oil reduces the need for more power because the oil’s viscosity moves quickly and easily through the engine parts. More traditional oil weights like 5w or 10w are too viscous to move as fast. In these high performance diesel engines, the 0w oil is exactly what you want and need if you expect your truck to keep running.

Ford’s Powerstroke engine isn’t the only diesel engine that takes advantage of HPOPs. Dodge Ram and General Motors each have their own high performance truck with this component tucked into the engine block. Currently no other truck company is in competition or uses a HPOP in their trucks.