Target audience:
Professional technicians, independent shops and DIY owners servicing BMW N55 engines
Use case:
Engine repair, maintenance, rebuild, refurbish or full restoration work
Completeness:
Covers every diagnostic and repair procedure with detailed illustrations and diagrams
Printable:
All pages printable so you can take what you need into the garage or workshop
Schematics:
Includes wiring schematics and factory specifications
Coverage areas:
Complete engine: mechanical, fuel, ignition, cooling, lubrication, turbocharging and diagnostics
Manual type:
Workshop service repair manual
Delivery:
Instant download on completion of payment
Shipping:
None required - no CD or paper manual wait, no shipping cost
Engine mechanical:
Cylinder head, block, pistons, crankshaft, timing chain and valvetrain
Turbocharging:
N55 twin-scroll turbocharger removal, inspection and installation
Fuel system:
High-pressure direct injection pump, injectors and fuel delivery
Ignition system:
Coils, spark plugs and firing order specifications
Cooling system:
Radiator, water pump, thermostat, electric coolant pump and hoses
Lubrication:
Oil pump, filter system, oil cooler and passages
Valvetronic:
Variable valve lift and variable cam timing (VANOS) service
Charging & starting:
Alternator, starter motor and battery system
Intake & exhaust:
Intake manifold, airbox and exhaust manifold procedures
Diagnostics:
Fault code diagnosis, symptom troubleshooting and test procedures
Removal & installation:
Step-by-step engine and component removal and installation
Disassembly & assembly:
Full engine teardown and rebuild sequences
Torque specifications:
Factory torque values for all fasteners
Adjustments:
Clearances, tolerances and alignment settings
Maintenance:
Scheduled service and wear item replacement
Illustrations:
Detailed illustrations and diagrams throughout
Wiring:
Wiring schematics included
Instructions:
Step-by-step repair instructions
Specifications:
Complete factory specification tables
Part identification:
Component diagrams aid correct part identification
Torque data:
Fastener and component torque values listed per procedure
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Configuration:
Inline-6, turbocharged
Valvetrain:
DOHC, 24 valves, Valvetronic variable valve lift, Double-VANOS
Displacement:
3.0L (2979 cc)
Induction:
Single twin-scroll turbocharger
Fuel delivery:
High-pressure direct injection (HPI)
Fuel requirement:
Premium unleaded
Manual focus:
This manual covers the N55 engine; transmission overhaul procedures are not the primary scope
Typical pairings:
6-speed manual, 6-speed automatic, 8-speed automatic (application dependent)
Interface procedures:
Engine-to-transmission removal, installation and alignment covered
Valvetronic:
Variable valve lift control covered in detail
Double-VANOS:
Variable cam timing service and diagnostics
Twin-scroll turbo:
Twin-scroll turbocharger operation and service
Direct injection:
High-pressure fuel injection system diagnostics
Engine management:
DME control module diagnostics and fault code troubleshooting
Wiring:
Full wiring schematics included
Oil & filter:
BMW CBS-based oil service interval guidance covered; typical interval up to 15,000 miles / 24 months
Spark plugs:
Replacement procedures with correct specifications
Air filter:
Service and replacement procedures
Engine oil:
BMW LL-01 specification full synthetic, SAE 5W-30 typical for N55
Coolant:
BMW-approved extended-life coolant specification covered
Capacities:
Oil and coolant capacities listed in specification tables
Timing chain:
N55 timing chain guide wear is a known issue; inspection and replacement covered
Valve cover gasket:
Oil leakage repair procedures included
Oil filter housing gasket:
Common leak repair procedure included
Water pump:
Electric water pump replacement procedure included
Manufacturer:
Bayerische Motoren Werke (BMW), Munich, Germany
Engine debut:
N55 introduced in 2009, replacing the twin-turbo N54
Key change:
Moved to a single twin-scroll turbo with Valvetronic, improving response and efficiency
Production:
Built in Germany; used across BMW 3 Series, 5 Series, X3, X5, X6 and other models
