Volvo 164 Instruction Book - page 45
SERVICING
26-27 Spark plugs, adjusting the
electrode gap, changing the plugs
The spark plugs should be removed after
every 10 000 km (6000 miles) and the elec-
trode gap measured. The gap should be
. 7-.8 m m (.028-032").
After 20 000 km (12500 miles) the spark
plugs should be changed. Tightening
should preferably be done with a torque
wrench. When fitting new plugs, be sure to
fit the right type.
As standard use spark plug type Bosch W
200 T 35 or corresponding from other
makers.
I f the car is mostly used for town driving,
Bosch W 175 T 35 spark plug, or corres-
ponding from other makers, should be
used.
When changing the spark plugs, check
that the suppresser connectors are in
good condition. Cracked or damaged con-
nectors should be replaced.
28-29 Ignition system
The distributor contact breaker gap and
the
engine ignition timing should be
checked every 10 000 km (6000 miles).
All adjusting work should be done by a
workshop
with the proper equipment.
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.
Fuel
Fuel with an octane value of 100 (ROT*) is
primarily recommended for normal driving.
Knocking or pre-ignition can occur if
petrol with low octane value is used. How-
ever, if highway motoring is often involved,
an octane value of at least 97 (ROT*)
should be used.
ROT* =Research Method.
ELECTRICAL SYSTEM
30 Check the battery electrolyte level
To ensure that the battery functions
properly, the electrolyte level should be
checked regularly. A suitable time to do
this is when the fuel tank is being filled.
The electrolyte level should be up to the
slit tubes. If the level is too low top up with
distilled water. Never add too much distil-
l ed water since this can cause the acid to
splash over and possibly damage the
engine compartment. Never check the
electrolyte level by lighting a match. The
gases formed in the cells are highly ex-
plosive.
44