BMW X5: Bolts
Although, the N54 engine has an all aluminum crankcase, many of the bolts are still aluminum as on the N52.
This is to reduce any potential confusion between steel and aluminum bolts. Some bolts, for example, are steel such as the cylinder head cover bolts. This is possible, due to the plastic cylinder head cover.
.png)
Fig. 11: Identifying Bolt
The N52KP and N51 engines use the same aluminum bolt configuration as the N52 engine, with little change.
The cylinder head cover bolts are like the N54 - steel, due to the plastic cylinder head cover.
The same rules apply to the handling of aluminum bolts as in the past.
Strict adherence to repair instructions is required to ensure proper connections.
Be sure to follow the proper torque/tightening angle sequence as outlined in the "tightening torques" section of TIS.
.png)
Fig. 12: Identifying Aluminum Bolt
READ NEXT:
Cylinder Head Cover
As stated before, the cylinder head cover used on all of the new NG6 engines
is made from plastic. However, the design differs between the engines due to
engine equipment.
For example, the N54 engi
Valvetrain
The valvetrain on the N52 introduced in 2006, used 5 mm valve stems on both
the intake and exhaust. To
increase durability, the exhaust valve stems were increased to 6 mm from 6/06
production.
All
Gaskets And Seals
Head Gasket
The head gasket design on the N54 is unique to that engine.
It features a multi-layer steel design. There is no silicone rubber perimeter
"shelf" as on the N52. This is not
needed due to
SEE MORE:
Instructions For Opening And Replacing Parts In Refrigerant Circuit
WARNING:
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling R 134a refrigerant.
Follow safety instructions for handling refrigerant oil.
CAUTION:
Always use new O-rings each time A/C connections are opened.
Moisten O-rings with refrigerant oil pr
Rear Lid
REMOVING AND INSTALLING REAR LID UPPER SECTION
Read contents of Body, General.
Necessary preliminary tasks:
Remove spoiler.
Remove trims on rear lid upper section.
Disconnect all cable plug connections and pull wiring harness out of
rear lid.
Remove both gas-filled struts.
NOTE: This work
