Ignition System - Volvo 121 Servicing

22
Check, replace the sparking plugs
The sparking plugs should be removed after every 10 000 km (6 000
23
miles) and the electrode gap checked. The gap should be 0.7-0.8 mm
(0.028-0.032"). After 20 000 km (12 500 miles) the plugs should be
replaced. This replacement should preferably be carried out at a Volvo
workshop where the sparking plugs are tightened with a torque wrench
to about 3.5 kgm (25 lb.ft.). When fitting new sparking plugs, be sure
to fit the right type (see page 56). Consult a Volvo workshop if you
consider fitting another type of plug.

24 Ignition system

25 The distributor contact breaker gap and the engine ignition timing set-
ting should be checked in a Volvo workshop after every 10 000 km
6000 miles). All adjusting work should be done by the workshop which
(
has the necessary equipment for this purpose. The distributor is one of
the most sensitive units in the engine and careless handling can lead to
decreased engine output and high fuel consumption or even serious damage
to the engine.
Petrol
The fuel used should be petrol with an octane value of at least 97".
If petrol with too low an octane value is used, knocking or glow ignition
can result.
When delivered from the factory, the engine is adjusted for fuel having
an octane rating of at least 97
* Research Method Rating
26 Carburettor
After every 10 000 km (6 000 miles), the vehicle should be taken to a
Volvo workshop for a check on the carburettor or the carburettors.
At every engine oil change check that the oil level in the centre spindle
of the carburettor or carburettors reaches up to about 6 mm
edge of the spindle. If it does not, top up to this level with oil of
the same type as that used in the engine. Where the temperature is con-
tinously below -20
in the centre spindle is recommended.
.
*
C (-4 F) the use of hydraulic oil SAE 5W/l0W
° °
SERVICING
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