Operating instructions

17 Air cleaner (B 20 B)
The air cleaner consists of a plastic cover
with a replaceable paper insert. The insert
should be replaced every 40 000 km (25 000
miles). Where driving conditions are partic-
ularly dusty, it 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.
18 Cleaning the air cleaner with
foam plastic sleeve
Cars intended for markets where dusty conditions are prevalent are fitted with
air cleaners provided with a foam plastic sleeve. This sleeve is normally washed
or changed after every 20 000 km (12 500 miles). After every 80 000 km
(50 000 miles) the paper filter must also be replaced.
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 in 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 10 000
km (6 000 miles). Too narrow clearances can cause burnt valves.
20 Compression test
Every 10 000 km (6 000 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 (6 000 miles). Due to
wear or dirt, this belt can start slipping with poor cooling and poor alternator
output as the 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 (3/8') with normal pressure.
The check can be suitably carried out by a Volvo workshop.
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SERVICING
SERVICING
22 Check the coolant level
The cooling system must be well filled with
coolant and not leak if it is to operate at
maximum efficiency.
Check the coolant level when filling up with
fuel. The level should be between the "Max"
and "Min" marks on the expansion tank.
When the engine is new or the cooling sys-
tem has been emptied, this check should be
carried out with particular thoroughness.
The cooling system filler caps on the radia-
tor and expansion tank should not be remov-
ed other than for topping up with coolant.
More frequent removal may impede the cir-
culation between the expansion tank and the
engine when the latter is warming up and
cooling.
Topping up with coolant
Top up with coolant when the level in the expansion tank drops down to the
"Min" mark. Top up to the level of the "Max" mark. Use a good quality
anti-freeze.
NOTE. Do not top up with water only, particularly during the winter. 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.
23 Change coolant
The coolant retains its properties for approx. 2 years when it should be changed.
To drain the coolant, open the tap on the right-hand side of the engine. Then
disconnect the hose between the lower part of the radiator and the engine.
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 refit
the cap. Then fill the expansion tank to the "Max" level or somewhat above
this. Refit 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.
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