Engine - Turbodiesel Injection Equipment Description

84peugeot01

Bulletin No. 129


Date: December, 1983
Subject: 1984 TURBODIESEL INJECTION EQUIPMENT



As announced in our Class 15 Bulletin No. 125, the 84 Turbodiesel models are fitted with 3 different types of pumps. The injectors to pump mating MUST be maintained to ensure proper engine operation and compliance with applicable manufacturer's and emission standards.



* These pumps are also fitted with an automatic cold start advance mechanism. The 112 series pump's device is controlled by an expanding wax cartridge which in turn is controlled by a relay and the oil pressure switch as shown on Page 3. The 131 series pump's device is controlled by a solenoid valve which in turn is controlled by a thermocontact on the cooling system.




Operating Principle - R112 Type Automatic Cold start Advance:

When the wax capsule is cold, a ball check valve closes off bleed port, thereby building up regulator valve pressure, in turn increasing advance. Once engine is started, oil pressure is built up and releases the ground for the oil pressure light and de-energizes the relay. Points at rest now feed ignition "RUN" BUS current to wax capsule, heating it up thus pushing ball valve away from bleed-off passage, advance piston assumes normal position as in a pump without the cold start advance mechanism.



Operating Principle - R131 Type Automatic Cold Start Advance:

The same principle applies as does on the 112 Pump except that here a solenoid valve is used to lift a piston away from the bleed-off passage. This solenoid can only be energized if the coolant temperature is at 15~ + 3~ C (59~ + 5.4~ F ) or above, thereby closing
- 2~ - 3.6~ the thermocontact. Cold start advance will not be authorized until the engine temperature has fallen below: