Target audience:
Professional technicians and DIY owners working on the BMW N55 engine
Purpose:
Repair, maintenance, rebuild, refurbish or restore the N55 engine
Approach:
Step-by-step instructions with detailed illustrations and specifications
Completeness:
Covers every single detail of the N55 engine
Illustrations:
Detailed illustrations, diagrams and wiring schematics
Printable:
All pages are printable for use in the garage or workshop
Delivery:
Instant download with no shipping cost or waiting
Coverage areas:
Diagnostics, disassembly, repair, rebuild and maintenance of the N55 engine
Manual type:
Complete factory-level service and repair manual
Language:
Portuguese (Título em português)
Delivery method:
Instant digital download after payment
Printing:
All pages printable - print only what you need
Workshop use:
Take printed pages into the garage or workshop
Engine mechanical:
Complete disassembly, inspection and rebuild procedures
Cylinder head:
Removal, installation, valve train service and torque specifications
Cylinder block:
Inspection, measurement and machining specifications
Crankshaft and bearings:
Clearance checks, bearing selection and installation
Pistons and rods:
Measurement, ring gap specifications and assembly
Timing chain:
Chain, tensioner and guide replacement with timing procedures
Valve cover and gaskets:
Replacement procedures and sealing specifications
Oil pan and oil pump:
Removal, service and installation
Lubrication system:
Oil circuits, cooler and filter service
Turbocharging system:
Twin-scroll turbocharger service, boost system diagnosis
Fuel system:
High-pressure fuel pump, injectors and fuel delivery
Ignition system:
Coils, spark plugs and ignition diagnostics
Cooling system:
Radiator, water pump, thermostat and electric coolant pump service
Intake and exhaust:
Intake manifold, Valvetronic components and exhaust manifold
Engine management:
DME diagnostics, fault codes and sensor testing
Wiring schematics:
Included for engine electrical systems
Torque specifications:
Full torque specs for all fasteners
Diagnostic procedures:
Step-by-step fault finding and troubleshooting
Special tools:
Special tool requirements identified where applicable
Specifications:
Complete engine specifications and tolerances
Illustrations:
Detailed diagrams and exploded views throughout
Parts information:
Part numbers and specifications as referenced in procedures
Fluid capacities:
Oil and coolant capacities included
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:
3.0L turbocharged inline-6
Valvetrain:
DOHC, 24 valves with Valvetronic and Double-VANOS
Induction:
Twin-scroll turbocharger
Fuel system:
High-precision direct injection (HPI)
Compression ratio:
Approximately 10.2:1
Output range:
Approximately 302-335 hp depending on application
Torque:
Approximately 295-332 lb-ft depending on variant
Redline:
Approximately 7,000 rpm
Manual:
6-speed manual available in some N55 applications (e.g. ZF GS6)
Automatic:
ZF 8-speed automatic (8HP45/8HP70) common in N55 vehicles
Dual clutch:
7-speed DCT in select M Performance applications
Manual scope:
This manual focuses on the N55 engine; transmission overhaul procedures are not the primary focus
Engine dimensions and weight
Bore x stroke:
84 mm x 89.6 mm
Approximate engine weight:
N/A - not specified in available data
Vehicle dimensions:
N/A - engine manual, vehicle-specific dimensions vary by model
Safety procedures:
Warnings and cautions included throughout repair procedures
High-pressure fuel system:
Depressurization procedures for direct injection system
Cooling system:
Hot coolant and pressurized system precautions
Crash test ratings:
N/A - engine manual; refer to specific vehicle model documentation
Engine technology covered
Valvetronic:
Variable valve lift system operation and service
Twin-scroll turbo:
Single twin-scroll turbocharger design and diagnostics
Direct injection:
High-pressure injection system and injectors
Engine management:
Bosch DME control unit diagnostics
Electric water pump:
Electronically controlled coolant pump service
Coverage:
N/A - engine manual; infotainment not covered
Oil change:
BMW condition-based service, typically every 10,000 miles / 15,000 km
Spark plugs:
Typically every 60,000 miles
Air filter:
Inspect regularly, replace as needed
Coolant:
Check level and condition per service schedule
Engine oil:
BMW LL-01 full synthetic 5W-30 (0W-30 for some markets)
Oil capacity:
Approximately 6.5 liters with filter change
Coolant:
BMW-approved HOAT coolant mixed 50/50 with distilled water
Known issues and wear items
Oil filter housing gasket:
Common leak point, replacement covered
Valve cover gasket:
Common wear item on higher-mileage engines
Oil pan gasket:
Known seepage area on N55 engines
Water pump:
Electric water pump failures addressed with diagnostics and replacement
Timing chain guides:
Wear inspection procedures included
Manufacturer:
BMW AG, Munich, Germany
Introduction:
N55 introduced in 2009 as successor to the twin-turbo N54
Design change:
Single twin-scroll turbo replaced the N54's twin turbos
Innovation:
First BMW inline-6 combining turbo, direct injection and Valvetronic
Production:
Built at BMW's Steyr plant, Austria
Applications:
Used in 135i, 335i, 535i, X3, X5, X6 and other BMW models
Successor:
Gradually replaced by the B58 engine from 2015