Volvo 120 Operating & Service Manual page 20

SERVICING
Air cleaner (B 20 B)
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The air cleaner consists of a plastic
cover with a replaceable paper insert.
The insert should be replaced every
40 000 km (25000 miles). Where driving
dusty,
conditions are particularly
should be changed more often. Between
the interval just mentioned the insert
must not be cleaned.
To replace the insert, undo the hose
clamp for the preheating hose as well
the clamps securing the top of the
cleaner. Then remove the top so that
the insert is accessible for removal.
Cleaning the air cleaner with
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foam plastic sleeve
markets where dusty conditions are prevalent are
Cars intended for
fitted with air cleaners provided with a foam plastic sleeve. This sleeve
i s normally washed or changed after every 20 000 km (12500 miles).
After every 80000 km (50000 miles) the paper filter must also be re-
placed.
The foam plastic sleeve is removed from the air cleaner and washed in
paraffin (kerosene), fuel oil or warm water mixed with a washing agent.
Squeeze the sleeve until it is clean and then rinse it in clean water.
When the sleeve is dry, dip it in engine oil SAE 30. Squeeze the sleeve
i n the oil and remove surplus oil by rolling the sleeve in a clean cloth.
Fit the sleeve on the paper filter.
19 Valves
Let your Volvo workshop check the engine valve clearances after every
1 0 000 km (6000 miles). Too narrow clearances can cause burnt valves.
20 Compression test
Every 10000 km (6000 miles) a compression test should be carried out
to get some idea of the condition of the engine. The test should be
carried out at a Volvo workshop.
21 Fan belt
The fan belt tension should be checked every 10 000 km (6000 miles).
Due to wear or dirt, this belt can start slipping with poor cooling and
poor alternator output as a result.
A way to test the tension is to press in the fan belt at a point midway
between the alternator and the fan. It should be possible to press down
the belt about 10 mm with normal pressure.
(3/ ")
$
The check can suitably be carried out by a Volvo workshop.
36
i t
Check the coolant level
22
The cooling system must be well filled
with coolant and not leak if it is to ope-
rate at maximum efficiency.
Check the coolant level when filling up
with fuel. The level should be between
the "Max" and "Min" marks on the ex-
pansion tank.
When the engine is new or the cooling
system has been emptied, this check
should be carried out with particular
thoroughness.
The cooling system filler caps on the
radiator and expansion tank should not
be removed other than for topping up
with coolant. More frequent removal
may impede the circulation between the
expansion tank and the engine when the
l atter is warming up and cooling.
Topping up with coolant
Top up the coolant by filling the expansion tank when its level has
dropped to the "Min" mark. Use a good quality anti-freeze for cars
(50 % anti-freeze and 50 % water) and top up to the "Max" mark.
NOTE. Do not top up with water only. Water by itself reduces both the
rust-protective and anti-freeze qualities of the coolant. Topping up with
water only in the winter can also damage the cooling system due to ice
forming in the expansion tank.
NOTE. In countries with very warm climate where there is little risk of
frost, water without anti-freeze can be used in the cooling system.
23 Change coolant
The coolant retains its properties for approx. 2 years when it should be
changed. To drain off the coolant, open the cock on the right-hand side
of the engine. Also disconnect the hose between the lower part of the
radiator and the water pump as this empties the radiator.
The expansion tank is emptied by lifting it up from its brackets and
holding it so high that the coolant runs down into the radiator.
Before filling with new coolant, flush the entire system with clean water.
The cooling system is filled with coolant through the filler opening on
top of the radiator. When this has been done, the heater control should
be set to max. to ensure that the entire system will be filled. Fill the
radiator to the top and re-fit the cap. Then fill the expansion tank to the
" Max" level or somewhat above this. Re-fit the expansion tank cap. Run
the engine warm, switch off the ignition and allow the engine to cool.
Then check the radiator to make sure that it is completely filled and that
the level in the expansion tank is at the "Max" mark. The capacity of
the cooling system is 8.6 litres (1.9 Imp. galls = 2.3 U.S. galls.) when
the level is at the "Max" mark in the expansion tank.
SERVICING
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