We have a full selection of Cummins QSK19 parts in stock and ready to ship. These large four cycle engines are used in a variety of uses, when a heavy duty engine is absolutely needed. These engines can be found in trains, generators, marine engines, and construction equipment. This engine is also equipped with Cummins advanced electronics to make this engine efficient as well as powerful. With proper care, these engines are known to last, and we have the tools so you can properly care for this strong engine. We are also pleased to offer Cummins KTA19 parts, at low prices. We can ship anywhere in the world, so you can get your parts fast. This six cylinder engine is also found in a variety of uses, including marine and mining equipment. If you need any help with these engines, give us a call and we would be happy to assist you. For answers to previously asked questions, scroll down to see more.


How can I identify my engine?

To identify this engine, simply look for the data plate on the engine. The model name will start with a K followed by the displacement of the engine and the power (in some cases). For example, a model number would look like KTTA19-600. This plate also contains other useful information such as the serial number and CPL number.


What is the difference between KTA and KTTA engines?

Both of these are very similar, except the KTTA has two turbochargers, with the high stage turbo attached to the exhaust manifold and the low stage turbo, whose function is to provide inlet air to the high stage turbo. If the engine has twin turbos, then it will have hydraulic variable timing, or HVT.


What is the difference between KT19 and KTA19 engines?

These engines, part of the K series, and are sometimes called K19, KT19, KTA19. Technically there are slight difference in these engines, depending on if they have a turbo but no aftercooler (KT) and if they are aftercooled with one or two turbochargers. All engines in this series have at least one turbo. If they are rated above 450 horsepower then they will have an aftercooler.


What is the power output for Cummins QSK19?

The output for these engines is usually between 373-597 kW.


What is the Cummins KTA19 oil capacity?

The oil capacity for this engine varies due to the type of oil pan. For oil pan part number 3008538, the range is between 8.5 – 10 gallons. For oil pan with part numbers 3009643 and 3200709, the capacity is 10.5- 12.5. The larger 3024391 pan has a capacity of 17.5 – 19 gallons, and the largest pan, 3032521, has a capacity of 16 – 18 gallons. If an engine has a rear gear train, then the oil capacity will be 2 gallons higher. Whenever using a new dipstick, make sure to run the engine in its intended application before marking the oil levels.


Can you use an LF 3325 oil filter on a KTA19 engine?

No, the fleetguard LF3325 oil filter cannot be used on this engine. The canister is not the proper size and will result in an oil leak.


What is the Cummins KTA19 coolant capacity?

The total capacity is 32 quarts. After the radiator is drained, there is about 3.5 liters of coolant (about one gallon) in the engine.


How is the water filter installed?

First use engine oil to lightly lube the seal of the filter. Then install it and turn it until the seal touches the filter head. Then turn an additional one-half to three-fourths of a turn. Turn the valve to the on position and close the drain cocks, ensuring that all of the parts are able to move properly.


What is the normal water temperature?

When measured at the top tank, the maximum temperature is 203 degrees F, and the minimum is 160 degrees F. The standard thermostat range is 175 to 195 degrees F.


Are the KTA19 water pump impellers interchangeable?

No. Cast iron impeller pumps use a shaft that is indented in the middle. Plastic or phenolic impeller pumps do not have an indention in the spline. If you are unsure which you have, be sure to check the parts when taking the water pump off for repair.


How can you tell if the thermostat is not working on my QSK19 or KTA19?

To check, heat up a glass of water and insert a thermometer. Note the temperature that the thermostat is rated for (for example, 185 degrees F.) Whenever the water reaches this temperature, place the thermostat inside the water and check to make sure it opens completely. The thermostat should start to open within plus or minus 3 degrees of its rated temperature, and should not open more than 0.38 inch. The maximum temperature for it to be completely open is between 10 and 22 degrees higher than its rated temperature. Remove the thermostat and make sure it returns to the closed position. When performing this test, make sure the thermostat does not touch the side of the container to avoid damage.


When should the connecting rod components be replaced?

Check for fretting damage and replace if damage is visible. Check the threads on the capscrew to make sure it is not stripped and that there are no cracks in the head.


Can the front cover from one engine be used on another?

Only if the two front covers are the same. Prior to 1980 (for KTA19), and on many marine engines, these parts were slightly different, and a two-piece front cover was used, which included the gear housing and a cover. The two piece cover come in cast iron or aluminum. The other style is called a one piece front cover which is a flat steel plate and an aluminum front cover.


Do all starting motors require spacers?

No, not all of the KTA engines require spacers. Be sure to note the number of spacers during disassembly.


What is the torque value for attaching the starter to the flywheel housing?

If your engine has a cast iron housing, then tighten to a torque value of 160 ft•lb. For aluminum, tighten to a torque value of 145 ft•lb.


Can you replace the connecting rod without replacing the caps?

No. In order to ensure these parts works properly, do not mix a new cap with a used rod, or a new rod with a used cap.


Are there different types of capscrews for the exhaust manifold on K19 engines?

Yes, there are three total types:

• The internal lockplate style consist of a grade 5 common hexagonal capscrews, a flat lockplate and washers, and are used on all K19 series engines, except for the KTA19-C (CPL of 351) and KTTA engines.

• The self-locking style consist of a capscrew and a hardened washer, and are used on some KTA19 enignes (CPL of 351) and some KTTA engines.

• The external lockplate style consist of a capscrew with a spacer and a lockplate that has an indentation in the middle. These are used on the KTA19 engines (CPL of 351) and some KTTA engines.


What are the torque value for the exhaust manifold?

With a metal gasket and an internal lockplate style, tighten to a torque value of 45 ft•lb. For the metal gasket and self-locking style, tighten to 35 ft•lb. For composite gaskets, tighten to 40 ft•lb for internal lockplate style, and 35 ft•lb for the external lockplate style.


Can a vibration damper be repaired on a QSK19 or KTA19 engine?

A damaged vibration damper should not be repaired, and should be replaced whenever needed.


Is a cylinder head with a non-flat surface able to be re-used?

Under certain circumstances a wavy cylinder head surface is acceptable for re-use. They must be small (under 0.018mm) and high and low points should not be closer than 25 mm apart. If in doubt, be it is best to replace this item since serious damage can result in a cylinder head that is too warped.


What steps should I take to store this engine?

If you plan on storing or not using the engine for over 6 months, take the following steps to make sure the engine will be safely stored. First, operate the engine at a high idle until the coolant reaches a temperature of 160 degrees Fahrenheit, and then turn off the engine. Drain the oil and put in drain plugs, and refill the engine with grade 2 SAE 30 (mil-L-21260) oil. Disconnect the fuel lines that run to the fuel filter and the injector return line, and place them inside a container of Diesel fuel. Fill another container with preservative oil like Noxrust. Start the engine with the fuel supply line in the Diesel, then move it to the preservative oil. Turn off the engine once the preservative oil comes out of the injector return line, and reattach these two lines. Drain the preservative oil from the oil pan, compressor, oil cooler and oil filters. After removing the intake and exhaust manifold, spray the preservative oil into the ports for the intake and exhaust in the cylinder head, as well as the intake for the air compressor. Remove the rocker lever covers and spray with the rocker levers with preservative oil. Finally, cover all of the opening with heavy paper and tape. If the engine is going to be stored for more than 24 months, flush the cooling system with a hot, light oil every year.

We offer Cummins KTA38 and KTA50 parts for sale at low prices. We have been in the Diesel engine business for over 10 years, and used feedback from our customers to make a better buying experience. We offer 24 hour order processing, so your order will be sent out within one business day. We know how important it is to get these items quickly, which is why we offer 24 hour order processing. We also know that our clients have different needs with respect to shipping speeds. That is why we offer a fully integrated shipping module that will offer you options, from next-day to ground. Our website also divides the parts by engine model, eliminating the need for part numbers or confusing searches. All of this was done with our customers in mind, making the buying process easy and affordable. Scroll down for more information, or click above to start looking for parts.

General Information and Engine Specifications

If you need to identify which engine you have, refer to the dataplate. The model will be on the column that is the furthest left. For older engines in this series, the dataplate will be on the right, rear side of the engine. For the newer engines, it was moved to the left bank of the front gear cover. This will tell the type and size of the engine.

Coolant type: Maximum chloride 40 ppm / sulfur 100 ppm.

Lubricating oil type: SAE 15W-40, low ash.

KTA38 cooling capacity: 32.7 gallons.

KTA50 marine cooling capacity: 52 gallons.

KTA50 with heat exchanger, cooling capacity: 60 gallons.

Maximum tank-top coolant temperature: 203-205 degrees F.

Maximum oil pressure: 70 psi.

Minimum oil pressure at idle: 20 psi.

Maximum oil temperature: 250 degrees F.

K38 oil capacity, sub base sump: 23 to 30 gallons.

K38 oil capacity, double deep front (or rear) and center sump: 37 to 44 gallons.

K50 oil capacity, sub base sump: 45 to 65 gallons.

K50 oil capacity, deep center sump: 46 to 54 gallons.

K50 oil capacity, front and front center sump: 45 to 65 gallons.

Exhaust valve: 0.027 inch.

Intake valve: 0.014 inch.

Firing order (engines built before Sept. 1986): 1R, 1L, 3R, 3L, 7R, 7L, 5R, 5L, 8R, 8L, 6R, 6L, 2R, 2L, 4R, 4L

Firing order (engines built before Sept. 1986): 1R, 1L, 3R, 3L, 2R, 2L, 5R, 4L, 8R, 8L, 6R, 6L, 7R, 7L, 4R, 5L


Troubleshooting and general guides

If you need help diagnosing problems, this can be a guide to figure out which Cummins KTA38 parts or KTA50 parts need to be replaced.

Problems with alternator

If you suspect that you are having problems, check the following areas. These are sources of possible problems with the performance of your overall engine.
• Check the alternator belt and the alternator drive pulley (to make sure it is not loose on the water pump drive shaft.) If either are loose, it can cause the alternator to not charge.
• If you are experiencing repeated problems, the alternator may not be the right size for the engine, and should be replaced with a proper unit.

Installing a new alternator
If you want to install a new alternator on your Cummins KTA38 or Cummins KTA50, use the following as a general guide:
• Make sure the two sleeves are in place in the bracket. Then, install the flat washers and capscrews, and tighten to a torque force of 66 ft•lb.
• Attach the alternator brace to the front gear cover using the capscrews. Make sure the four plain washers and the two lock washers are in place. The plain washers act as spacers and must be correctly installed.
• Place the lock washers between the alternator brace and the capscrew and tighten to 65 ft•lb.
• Locate the slot in the brace, which is a slightly curved line at the bottom of the brace. Install the belt and adjust the tension.
• In the bottom bracket, install the vibration isolators, followed by the plain washer and nut. Make sure that the isolators are not overtightened. When it is compressed, it must be about 13 mm tall.
• Put a vibration isolator in-between the main guard and top bracket The belt guard can then be installed, and the capscrews tightened to 35 ft•lb.
• When installing a new alternator the pulley mounting nut must be tightened to a torque of 75 ft•lb.


Problems with coolant, or engine overheating

If your Cummins KTA38 or KTA50 engine is experiencing problems with coolant temperature, use the following as a guide.

Troubleshooting gradual overheating:
• First, check to make sure the coolant level and cooling system does not have any collapsed tubes. Then check the fan to make sure it is not showing signs of damage. Check the cooling system pressure cap for any signs of leaking and replace with a pressure cap that is rated for higher pressure.
• Check to make sure the oil levels are not too high or low, and that the vent lines aren’t damaged. Check the fuel level as well, since too much fuel can lead to overheating.
• Check the radiator core to make sure it is not damaged. Check the heat exchanger to make sure it functions correctly.
• Replace the water pump.
Troubleshooting sudden overheating.
• Check the drive belt for the fan drive and make sure the fan is working properly.
• Check the coolant level and for any signs of leaking.
• If it is a marine engine, check the sea water strainer to make sure it is not plugged.
• Check the heat exchanger and radiator fins to make sure they are not damaged.
• Make sure it is not a problem with the thermostat or gauge.
• Check the water pump and replace.

Water pump replacement:
• Prepare by disconnecting the battery, draining the cooling system and removing the coolant bypass tube.
• Remove the radiator hose from the inlet.
• Locate the two capscrews on the support bracket and the heavy washer, and the four capscrews that hold the housing to the water pump. Remove them and pull the support bracket housing from the pump, discarding the o-ring.
• This next part involves parts that weigh over 50 lbs, so be sure to get help or properly prepare. Take the four capscrews and four capscrews out. The pump and coupling can be removed, along with the plate. Discard the o-ring seal and the gasket.
• Remove the two tubes that lead to the aftercooler and the jacket water bypass.
• Remove the hose clams from low temp aftercooler outlet. Then remove the pipe. Locate the jacket water bypass pipe and remove the hose clamps and the pipe itself, discarding the gaskets.
• Remove the four capscrews and the jacket water radiator inlet connection. The support bracket can then be removed followed by the pump itself. Remove and discard any gaskets, making sure to clean any gasket material off of the surface.
• Signs that the pump must be replaced includes worn, damaged or cracked shaft or splines.
• Once you have the new pump, install the support bracket. Then install a new gasket and the connection. Tighten capscrews to a value of 30 ft•lb.
• Install the draincock and tighten to 133 in-lb.
• Using vegetable oil, lubricate the new o-ring and install it in the groove of the adapter plate.
• Put the adapter plate on the body (thinner side must be the side closest to the pump body.) Lubricate the bearings with clean engine oil and install the spline coupling.
• Install the adapter plate on the pump and the spline coupling on the shaft of the water pump.
• Put a new gasket on the pilot (where the drive meets the pump.)
• Rotate the pump so the splines on the water pump drive shaft and the spline coupling match. Tighten the screws enough to hold them together, but not all the way.
• Put a gasket between the cylinder block and the adapter plate, rotating the housing so the pump outlet and adapter plate are as close as possible.
• Tighten pump-to-pump drive capscrews to 44 ft•lb. Tighten the capscrews on the cylinder block connection to 30 ft•lb.
• Install the larger o-ring in the housing and lubricate with vegetable oil. Reattach the housing and tighten the four capscrews to 30 ft•lb. Tighten the bracket to hand hole cover to a value of 44 ft•lb.
• Reattach the bypass connections with new gaskets. Tighten capscrews to 33 ft•lb and the hose clamps to 50 in-lb.
• Replace the coolant filter and the radiator hose to the water pump inlet. Connect the water lines.

Changing the cylinder liner

The Cummins KTA38 and Cummins KTA50 are known to be reliable engines, but like any engine, they will require an overhaul and new cylinder liners with extended use. This section outlines changing the cylinder liner, along with signs that they need to be repaired. Always trust a Diesel mechanic for any major repairs.
Signs that your cylinder liners should be replaced:
• The liners have cracks.
• The outside diameter has corrosion or pits that are larger than 1.6 mm in length.
• The inside has scores or deep scratches. If it can be felt with a fingernail then it should be replaced.
• The inside has a mirror like finish.

Installing a new liner
• Install a liner puller into the block, and withdraw the liner. Mark the cylinder it came out of.
• Remove the crevice seal and the two d-rings.
• Use vegetable oil to lubricate the packing ring bores of the block.
• Put any shims into place if needed.
• Using the installation tool, move the new liner into place. Make sure that you do not tighten to over 35 ft•lb.