BMW

Service Training

Note

The information contained in the training documentation is

intended solely the use by participants in this BMW service

training course.

Information status: 1997

Changes/supplements to technical data are specified in the

relevant Technical Service Information.

VK-12; W. R. Fritzsche/G. Nehmeyer

1. M47D20 VP44

1.1 Introdution

The M47 power plant is the first BMW 4-cylinder diesel

engine featuring direct fuel injection.

It will be used for the first time in the E46.

1.2    Objectives

 To develop a new 4-cylinder diesel engine featuring

4-valve technology and direct fuel injection

- To gain and maintain the top position with regard to

power output and performance qualities in the 4-cylinder

diesel engine segment up to 2.0 l displacement

- To reduce fuel consumption by more than 10 % com-

pared to the M41 swirl-chamber diesel engine

- To maintain operating refinements and interior acoustics

comparable to those of swirl-chamber engines

- To comply with EU-3 exhaust emission limits from series

launch and to create the conceptual prerequisites for

achieving the stringent requirements of E-OBD (Europe

on-board diagnosis).

1.3    Technical

features

With the combination of its product features, the M47

surpasses all direct injection engines (DI engines) of the

competition and is considered to be the "top of its class"

DI in the market.

BMW will introduce the DI system in early '98 as the

technology has only now become available to effectively

improve characteristic features for the customer while at the

same time fulfilling all system requirements with regard to

function, efficiency, comfort, durability, safety, environmen-

tal acceptance and ease of servicing.

- In-line 4-cylinder engine with cast iron crankcase and

light alloy cylinder head.

- 4-valve technology with centrally arranged injection

nozzle

- Exhaust turbocharger with intercooler

- Direct fuel injection with electronically controlled  high

pressure injection pump (VP44) and two-spring nozzle

holder combination

- Electronically controlled exhaust gas recirculation with

hot-film air mass meter (HFM)

- Exhaust re-treatment by means of diesel-specific

oxidation catalytic converter

- Average inspection intervals every 20 000 km.