Electrical System - Volvo 164 Instruction Book

SERVICING
26-27 Sparking plugs, adjusting the
electrode gap, changing the plugs
The sparking plugs should be removed
after every 10 000 km (6000 miles) and
the electrode gap measured. The gap
should be .7-.8 mm (.028-.032").
After 20 000 km (12 500 miles) the sparking
plugs should be changed. Tightening
should preferably be done with a torque
wrench. When fitting new plugs, be sure to
fit the right type (see page 58). W 175 T35
or corresponding is recommended for nor-
mal driving and for very hard driving Bosch
W 200 T35 or corresponding should be
used.
When changing the sparking plugs, check
that the suppresser connectors are in
good condition. Cracked or damaged con-
nectors should be replaced.
44
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 with an octane value of 100 (ROT*) is
primarily recommended for normal driving.
Knocking or pre-ignition can occur if
petrol with law 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 5-10 mm
(3/16-3/8") over the top of the cell plates.
I f the level is too low, top up with distilled
water. Never add too much distilled water
since this can cause the acid to splash
over and possibly damage the engine
compartment. Never check the electrolyte
l evel by lighting a match. The gases
formed in the cells are highly explosive.