BMW N55, Manual, Page: 100 / 100

Note: It is essential to follow the repair instructions and observe the utmost
cleanliness when working on the high pressure fuel system. Even minute
soiling or damage at the connections of the high pressure lines and
cause leaks.
There is a new tool # 13 0 280 that must be used when replacing the PTFE seals on the
tips of the solenoid valve injectors. As with piezoelectric injectors these seals must be
replaced if and when the injectors are being re-installed.
Ignition Coils
The ignition coils of the N55 have been redesigned for better rigidity and durability.
Particular care must be taken when working on the fuel system to ensure that the ignition
coils are not wet with fuel. The resistance of the silicone material is greatly reduced by
contact with fuel. This could compromise the coils insulation and result in arcking at the
top of the spark plug causing a misfire.
• The ignition coils must be removed before working on the fuel system.
• When installing new solenoid valve fuel injectors utmost cleanliness must be
observed.
• After removing the ignition coils use a rag to prevent fuel from entering the spark
plug well.
• Ignition coils that have been saturated with fuel must be replaced.
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N55 Engine