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N54 Engine Oil Cooler Replacing
 
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Pelican Technical Article:

N54 Engine Oil Cooler Replacing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

T25, T30 Torx bits, flathead screwdriver

Applicable Models:

BMW 535i/xi Sedan (2008-10)
BMW 535xi Wagon (2008)

Parts Required:

Engine oil cooler, oil cooler line sealing O-rings

Hot Tip:

Work with a cool engine and clear DME fault codes when done

Performance Gain:

Proper engine oil cooling

Complementary Modification:

Inspect or replace oil cooler lines / hoses

BMW E60 models with an N54 turbocharged engine utilize an engine oil cooler. Under normal (street) driving conditions and in cool or temperate regions, engine oil temperature is maintained at about 250 degrees F (122 degrees C). But in hot regions and when the vehicle is used for high speed driving in mountainous regions, it is possible for oil temperature to climb much higher. An engine oil cooler helps to maintain a safe oil temperature for the turbochargers and the engine. The cooler is a heat exchanger installed in the cooling fan shroud. Oil is supplied to the cooler using high-pressure hoses from the oil filter housing.

I have found oil leaks in the front of the engine stemming from the oil cooler and oil cooler lines. The oil cooler is mounted inside the cooling fan shroud, so it can be tricky to confirm a leak in this area. Check the engine splash shield. There will be oil on the front of it, likely cleaner toward the bumper and covered with dirt toward the engine. This article will show you how to replace the oil cooler lines and associated sealing O-rings.

When replacing your oil cooler, work with the engine cold and disconnect the battery negative cable. Disconnecting the negative battery cable will prevent the electric cooling fan from starting while being serviced. The fan could start at any time and personal injury can occur. Don't skip this step.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Working in the trunk, disconnect the battery negative cable and cover the battery terminal so the cable does not accidentally come in contact with the disconnected cable. See our tech article on battery replacing for notes on disconnecting and reconnecting the battery.

Remove the engine splash shield. See our tech article on splash shields removing.

Working at the top of the radiator support, remove the ten T30 Torx fasteners (green arrows).
Figure 1

Working at the top of the radiator support, remove the ten T30 Torx fasteners (green arrows).

Lift the radiator support in the direction of the green arrow to remove it.
Figure 2

Lift the radiator support in the direction of the green arrow to remove it.

Then, flip the radiator support (green arrow) over and rest it on the top of the engine.
Figure 3

Then, flip the radiator support (green arrow) over and rest it on the top of the engine.

Working at the top of the radiator, remove the five T25 Torx fasteners (green arrows).
Figure 4

Working at the top of the radiator, remove the five T25 Torx fasteners (green arrows).

Then pull the coolant reservoir / radiator vent hose out of the plastic mounts (green arrows).
Figure 5

Then pull the coolant reservoir / radiator vent hose out of the plastic mounts (green arrows). Be careful as these hoses become brittle over time and can break (yellow arrows). These break about 30% of the time. Have one on hand if you are not sure of the condition of yours.

Working at the top of the cooling fan, remove the AUC sensor by pulling it in the direction of the green arrow.
Figure 6

Working at the top of the cooling fan, remove the AUC sensor by pulling it in the direction of the green arrow. Then lift it up and remove it. Place it out of the way, on the right side of the engine compartment.

Lift the plastic cover up and off the radiator in the direction of the green arrow.
Figure 7

Lift the plastic cover up and off the radiator in the direction of the green arrow.

Working at the right side of the cooling fan, disconnect the cooling fan electrical connector by pressing the release tab and pulling it apart.
Figure 8

Working at the right side of the cooling fan, disconnect the cooling fan electrical connector by pressing the release tab and pulling it apart.

Working at the bottom of the cooling fan, remove the cooling hose from the plastic mounts (green arrows).
Figure 9

Working at the bottom of the cooling fan, remove the cooling hose from the plastic mounts (green arrows). Pull the hose straight out to remove it. Then cut the wire tie (yellow arrow) to release the bottom of the hose. Not all E60 models have this configuration. If you do not, ignore this step.

Working at the sides of the cooling fan, remove the oil cooler (red arrows) line fasteners.
Figure 10

Working at the sides of the cooling fan, remove the oil cooler (red arrows) line fasteners. Use a 6mm Allen bit to remove the fasteners.

Remove the oil cooler line from the cooling fan shroud by pulling it straight out.
Figure 11

Remove the oil cooler line from the cooling fan shroud by pulling it straight out. Be prepared to catch any dripping oil in a rag. If reusing the line, be sure to replace the sealing O-ring (red arrow).

Follow the right side line down to the cooling fan motor.
Figure 12

Follow the right side line down to the cooling fan motor. Then remove the T25 Torx fastener (red arrow) securing the line to the cooling fan.

If you are replacing the cooler lines, remove the final 6mm Allen fastener at the oil filter housing (red arrow).
Figure 13

If you are replacing the cooler lines, remove the final 6mm Allen fastener at the oil filter housing (red arrow). Then remove the lines from the oil filter housing and the vehicle.

Lift the cooling fan up slightly, then working at the left side of the cooling fan shroud, flip the mounting tab toward the fan.
Figure 14

Lift the cooling fan up slightly, then working at the left side of the cooling fan shroud, flip the mounting tab toward the fan. This allows the fan to be removed, clearing the radiator hose. Then pull the cooling fan up and remove it from the engine compartment. Be careful not to snag the fan on wires or hoses.

Place the cooling fan on the bench.
Figure 15

Place the cooling fan on the bench. Then remove the oil cooler from the shroud by lifting it up and feeding it out of the bottom mounts. Be prepared to catch any dripping oil when the cooler is removed. Install the new cooler into the shroud. Then, install the cooling fan. Slide it down into the engine compartment. Move it into place. Then lock the retaining tabs. Be sure that the fan is properly seated in the radiator support. If the fan is giving you a hard time and will not drop all the way down, check to see if the bottom of the cooling fan is hung up on the radiator or hoses. Install the oil cooler lines and reverse the remaining steps to reinstall the oil cooler and the attached fan/shroud.

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Comments and Suggestions:
Akbar Comments: Oh ok so once I remove the radiator the cooler and or the thermostat should follow with the radiator to remove the automatic transmission oiler cooler thermostat???
July 29, 2016
  Followup from the Pelican Staff: Yes. - Nick at Pelican Parts  
akbar Comments: hey how are you? my name is akbar and i have a 550i v8 e60 20007 Bmw. My question to you is my oiler cooler is located on the lower left side front of the vehicle by the well.how can i access the oil cooler thermostat to replace it...do i have to remove the fan itself and remove it that way or which would you prefer to proper remove and install the new thermostat? thank you for your help...
July 15, 2016
  Followup from the Pelican Staff: I would remove the radiator.

We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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Page last updated: Fri 12/9/2016 02:39:43 AM