Volvo 164 Owner's Manual - page 47
SERVICING
21 Valves
The valve clearance should be checked
after every 10 000 km (6000 miles).
The check should be carried out in a work-
shop.
22 Compression test
To get some idea of the condition of the
engine, a compression test should be car-
ried out after every 10 000 km (6000 miles).
This test should preferably be carried out
i n a workshop.
23 Drive belts
The belt tension can be checked by pres-
sing in the fan belt at a point midway be-
tween the alternator an the fan. It should
be possible to press down the belt there
about 10 mm 3/8 ") with normal pressure
(7.5-11 kp = 16-24 l b). I f the car has
air conditioning, carry out the same check
on the compressor drive belt, but with a
pressure of 9-12 kp (20-26 l b). The check
can suitably be carried out in a Volvo work-
shop. Also check the tension on the drive
belt for the power pump. It should be
possible to depress the belt midway about
5 mm (3/16")
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24 Checking 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. The check should
be carried out with particular thoroughness
when the engine is new or the cooling sys-
tem has been empty.
Do not remove the filler cap other than fot
topping-up with coolant. Frequent removal
may prevent coolant circulation between the
engine and the expansion tank during en-
gine warming up and cooling.
Topping-up with coolant
Top-up with coolant by filling the expansion
tank when its level has gone down to the
"Min" mark. Use all the year round a mix-
ture of 50% reliable anti-freeze and 50
water. Top up to the "Max" mark.
NOTE. Do not top up with water only, par-
ticularly during the wintertime. Water by it-
self reduces both the rust-protective and
anti-freeze qualities of the coolant. It can
also cause damage to the cooling system
i f ice should form in the expansion tank.
NOTE. In very warm parts of the country
where there is little risk of frost, water can
be used without anti-freeze.
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