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M62 8-Cylinder Engine VANOS Seal Replacing
 
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Pelican Technical Article:

M62 8-Cylinder Engine VANOS Seal Replacing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

10mm socket and ratchet, flathead screwdriver

Applicable Models:

BMW X5 Sport Utility (2000-06)

Parts Required:

VANOS seals, seal fasteners (if needed)

Hot Tip:

Work with a cool engine

Performance Gain:

Remedy oil leaks

Complementary Modification:

Replace engine oil

BMW X5 models with an M62 8-cylinder engine utilize a camshaft actuator to vary camshaft angle. This system is the VANOS system. It enables BMWs to increase performance while keeping emissions within the required range. The camshaft actuators are controlled via engine oil pressure with solenoids. The solenoids stick out of the front timing covers and each have a seal. There is one actuator per bank. These seals can leak oil, causing quite the mess down the front of your engine. These leaks are often mistaken for valve cover leaks. If you suspect the leak is from your VANOS solenoid seal, follow the leak to the source by searching for a clean spot of fresh engine oil on the ground. If there is too much residue, clean the area thoroughly. Then run the engine while monitoring the VANOS seals for a leak. The engine-cooling fan blows the oil all over the timing cover. Keep that in mind. In this tech article I will go over replacing the VANOS seals on both banks of the M62 8-cylinder engine. Be sure to work with a cool engine.

Remove the engine covers. See our tech article on engine cover removing.

The VANOS solenoids are located at the front timing cover of each bank of the engine (green arrows).
Figure 1

The VANOS solenoids are located at the front timing cover of each bank of the engine (green arrows).

First we have to remove the intake air duct that runs from the throttle housing (yellow arrow) to the mass air flow sensor (green arrow).
Figure 2

First we have to remove the intake air duct that runs from the throttle housing (yellow arrow) to the mass air flow sensor (green arrow).

Working at the fresh air intake, remove the four plastic rivets (green arrows).
Figure 3

Working at the fresh air intake, remove the four plastic rivets (green arrows). Use a pair of pliers (inset) to remove the center rivet. Once all center rivets have been removed, pull the duct up to detach it from the vehicle.

Then lift the duct up on the left side while detaching it from the duct (green arrow) on the right side.
Figure 4

Then lift the duct up on the left side while detaching it from the duct (green arrow) on the right side.

Working at the mass air flow sensor, loosen the hose clamp using a flathead screwdriver (green arrow).
Figure 5

Working at the mass air flow sensor, loosen the hose clamp using a flathead screwdriver (green arrow).

Working at the throttle housing duct, loosen the hose clamp using a flathead screwdriver (green arrow).
Figure 6

Working at the throttle housing duct, loosen the hose clamp using a flathead screwdriver (green arrow).

Next you will have to rotate the throttle housing duct up toward the left side of the vehicle in the direction of the green arrow.
Figure 7

Next you will have to rotate the throttle housing duct up toward the left side of the vehicle in the direction of the green arrow. This will detach it from the mass air flow sensor. Once detached from the mass air flow sensor, pull the duct off the throttle housing. There are two small hoses you have to disconnect in the following step. Be careful not to damage them during this step.

Working at the bottom of the intake air duct, detach the plastic line by squeezing the release collar (green arrows) while pulling the line off the duct.
Figure 8

Working at the bottom of the intake air duct, detach the plastic line by squeezing the release collar (green arrows) while pulling the line off the duct. Then pull the vacuum hose (yellow arrow) straight off the duct to remove it.

When removing the duct, be sure not to misplace the rubber duct seal (green arrow).
Figure 9

When removing the duct, be sure not to misplace the rubber duct seal (green arrow). The seal will either stay inside the duct or remain attached to the throttle housing.

Right Side Seal: Working on the right side VANOS solenoid, disconnect the electrical connector (green arrow) by pressing the wire release and pulling it off.
Figure 10

Right Side Seal: Working on the right side VANOS solenoid, disconnect the electrical connector (green arrow) by pressing the wire release and pulling it off.

Right Side Seal: Remove the two 10mm VANOS seal fasteners (green arrows).
Figure 11

Right Side Seal: Remove the two 10mm VANOS seal fasteners (green arrows). Use a 1/4-inch ratchet with a four-inch extension to clear the surrounding components.

Right Side Seal: Once you have removed the fasteners, use a flathead screwdriver to gently lever the seal out of the timing cover (green arrow).
Figure 12

Right Side Seal: Once you have removed the fasteners, use a flathead screwdriver to gently lever the seal out of the timing cover (green arrow). Gently lever the perimeter of the seal until it is free. Then remove the seal from the engine. Clean the solenoid and timing cover sealing surface. Be sure no debris falls into the timing cover. Install a new seal and tighten the fasteners.

Left Side Seal: Working on the left side VANOS solenoid, disconnect the electrical connector (green arrow) by pressing the wire release and pulling it off.
Figure 13

Left Side Seal: Working on the left side VANOS solenoid, disconnect the electrical connector (green arrow) by pressing the wire release and pulling it off.

Left Side Seal: Remove the two 10mm VANOS seal fasteners (green arrows).
Figure 14

Left Side Seal: Remove the two 10mm VANOS seal fasteners (green arrows). Use a 1/4-inch ratchet with a four-inch extension to clear the surrounding components.

Left Side Seal: Once you have removed the fasteners, use a flathead screwdriver to gently lever the seal out of the timing cover.
Figure 15

Left Side Seal: Once you have removed the fasteners, use a flathead screwdriver to gently lever the seal out of the timing cover. Gently lever the perimeter of the seal until it is free. Then remove the seal (green arrow) from the engine.

This photo shows an old seal and the two sealing surfaces of the seal.
Figure 16

This photo shows an old seal and the two sealing surfaces of the seal. The yellow arrow points to the sealing surface that mates with the solenoid. The green arrow points to the sealing surface that mates with the timing cover. Be sure both sealing surfaces on the engine are clean and in good condition before installing the new seal.

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Page last updated: Sat 12/3/2016 02:25:18 AM