How does the 603 shut off mechanism work? What happens when the key is turned off, what is connected to where? TIA

ooops sorry... should be in the DIESEL section...

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project

Moves the fuel rack to a zero delivery position.
The vacuum diaphragm does the exact same thing.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

You need to install a vacuum switch valve in the ignition circuit to stop the engine with the key, the engine stops when vacuum is routed to the shutoff of the injection pump.

In 123, 124 etc the vacuum lines actually are connected to a valve on the ignition lock housing, in your W140 that bit is missing. Use any generic vacuum solenoid valve for this purpose.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

ok, so in effect... I have to apply/supply vacuum to the solenoid to shut off the engine. Copy that! thanks!

__________________

85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project