Testing EGR

Vaccum tester

116 589 25 21 00

Revolution counter

Testing EGR

1 Pull vacuum line from EGR valve (60), plug-on test hose and activate with vacuum. If operation of engine is not getting clearly worse, replace EGR valve.

2 Check activation of EGR valve. Pull off vacuum line at EGR valve (60) and connect to vacuum tester. Increase engine speed slowly to approx. 3000 rpm. There should be no vacuum up to approx. 1800 rpm. Vacuum connections on throttle valve housing may be mixed up.

a To thermovalve for EGR b To ignition distributor

14.2 lib—475/1 F2

3 Check thermovalve (37) 50 C. Pull vacuum line white/brown/purple from EGR valve and activate with vacuum. At coolant temperatures < 50 C no passage on thermovalve.

1 Mixture controller 12 Intake manifold 31 Exhaust manifold

37 Thermovalve 50 C

60 EGR valve

a To ignition distributor

Color code br = brown rs = pink rt = red ws = white

EGR

Connection ignition distributor advance

Installation: September 1981

Engine end No. Model          Engine manual

transmission

automatic transmission

Chassis end No.

Installation

mixed

Installation continuous

107.042 110.990

010107-011567

011569

123.007 123.033 123.053 123.093

110.988

start of series

085174-096468        096496

024129-024416        024417

010064-010252        010253

021381-043198        043199

039922-042786        042787

126.022 126.023

14.2 llb-475/3 F 2