EnginesM52TU.pdf

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Table of Contents
ENGINES
Subject
Page
M52TU.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Crankcase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Crankshaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pistons and Connecting Rods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Flywheel and Self Adjusting Clutch (SAC). . . . . . . . . . . . . . . . . . . . . .10
Oil Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Valve Train/VANOS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
VANOS Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Double Vanos Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cylinder Head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Cooling System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Map Cooling Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Resonance/Turbulence Intake System. . . . . . . . . . . . . . . . . . . . . . . . 18
Idle Control Valve and Turbulence Bores. . . . . . . . . . . . . . . . . . . . . . 19
Exhaust Manifolds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Subject
Page
M54.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mechanical Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Review Questions.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
M52TU B25 AND B28 ENGINES
Model: E46, 323i and 328i
Production Date: M52TU B28: 6/98-6/00 M52TU B25: 6/98-9/00
Objectives
After completing this module you should be able to:
•
•
•
List the changes made to the M52TU from the previous M52 engine.
Describe the advantages offered by the use of Double Vanos valve control.
Understand the Mechanical, Hydraulic and Electronic controls used in Double
Vanos operation.
Explain the cooling system of the M52TU.
Describe the operation and advantages of the Turbulence Intake System.
•
•
3
Engines
Introduction
The M52 TU (Technically
Updated)
engine, is a further development of the M52 engine used
in E36 and E39 vehicles. It is available in two displacement versions, the 2.8 liter and the
2.5 liter.
The development objectives were to reduce the fuel consumption and emission levels,
while increasing the power output and performance characteristics of the previous M52.
The engine management system, Siemens MS42.0, was developed, in conjunction with the
mechanical changes, to provide the needed electronic control to allow the engine to com-
ply with the Low Emission Vehicle (LEV) standards.
During development, particular importance was given to improving quality, engine acoustics
and comfort. Further development criteria was placed on increasing power
achieved by an improved torque curve.
4
Engines
Overview
The following changes were made to the M52 engine to achieve the development goals:
•
•
•
•
•
•
•
•
•
•
Re-designed crankcase
Modified crankshaft
Modified pistons
Oil pump/oil pressure regulator integrated into the oil sump deflector
Double VANOS for the camshaft drive
Re-designed cooling system
Map controlled thermostat
Quick disconnect hoses for cooling system
Motor driven throttle valve
Catalytic converters mounted in the exhaust manifold
5
Engines

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