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Engine Oil Cooler Replacement
 
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Pelican Technical Article:

Engine Oil Cooler Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

10mm socket, 5mm 6mm Allen sockets

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

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 Z4 models with an S54 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, most times from impacts. 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 in 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.

An engine oil cooler helps to maintain a safe oil temperature for the turbochargers and the engine.
Figure 1

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 (red arrow). Oil is supplied to the cooler using high-pressure hoses from the oil filter housing.

Remove the engine splash shield.
Figure 2

Remove the engine splash shield. Once removed, you can see the oil cooler (red arrow). First, remove the oil line mount at the left side (green arrow).

First, remove the oil line mount at the left side.
Figure 3

First, remove the oil line mount at the left side. Remove the 10mm fastener (red arrow). Leave the plastic mount on the lines.

Working at the left side of the oil cooler, remove the 6mm Allen oil cooler line fasteners (red arrow).
Figure 4

Working at the left side of the oil cooler, remove the 6mm Allen oil cooler line fasteners (red arrow). Next the mounting fasteners will have to be removed. There is one at each side. The green arrow points to the left side fastener.

Remove the 5mm Allen oil cooler mounting fasteners.
Figure 5

Remove the 5mm Allen oil cooler mounting fasteners. The red arrow points to the left side. The right side is similar.

Remove the oil cooler from the cooling fan shroud by pulling it straight down.
Figure 6

Remove the oil cooler from the cooling fan shroud by pulling it straight down. Then pull the cooler lines (red arrow) out. Be prepared to catch any dripping oil in a pan (green arrow).

If reusing the line, be sure to replace the sealing O-rings (red arrows).
Figure 7

If reusing the line, be sure to replace the sealing O-rings (red arrows).

Working at the bottom of the oil cooler, remove the four 10mm mounting fasteners (red arrows).
Figure 8

Working at the bottom of the oil cooler, remove the four 10mm mounting fasteners (red arrows). Then remove the old oil cooler from the plastic mount, and transfer the mount to the new oil cooler. Reverse these steps to install the new oil cooler. Be sure to top up the engine oil when done.


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Page last updated: Mon 12/5/2016 02:58:22 AM