Bosch 2008 - Manual (Page 40)

A 38 | Gasoline injection components
Bosch Automotive Aftermarket 2008 | 2009
Ignition distributors
Purpose:
The ignition distributor, which runs at half the engine speed, assigns the high voltage (ignition
sparks) to the particular engine cylinder (firing order). A basic distinction is made between
three types:
Type 1:
Contact-type ignition distributor (ZV-K). This is used with conventional coil ignition and
breaker-triggered transistorized ignition (TZ-K). The ignition point is modified by way of speed-
dependent centrifugal or vacuum advance.
Part number:
0 231 ... ...
Type 2:
Ignition distributor with non-contacting sensor. This is used for transistorized ignition with
inductive or Hall sensor. The ignition point is modified by way of speed-dependent centrifugal
or vacuum advance. Also double-acting. Also with add-on trigger box.
Part number:
0 237 ... ...
Type 3:
Ignition distributor for electronic ignition. The ignition distributor contains only the high-voltage
section (cap, rotor).
Part number:
0 237 5.. ...,
BX: 0 986 237 ...
Injectors (electromagnetic)
Systems:
D, L, LH-Jetronic, Motronic
Purpose:
Each cylinder is assigned an injector. This is triggered electronically and injects the fuel up-
stream of the engine intake valves. In this process, the nozzle needle is lifted off its seat by
approx. 0.1 mm, allowing the fuel to emerge through a precision annular orifice. Even the
slightest contamination of the fuel or deposits can impair operation. The injectors are installed
by way of special holders in rubber mouldings. The thermal insulation thus achieved prevents
the formation of vapor bubbles and thus ensures good hot starting performance. To avoid
unmetered air and leakage, the O-rings are always to be replaced prior to renewed installation.
Part number:
0 280 150 ..., 0 280 155 ..., 0 280 156 ..., 0 280 157 ..., 0 280 158 ...