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Source – Volvo AB, Göteborg, Sweden page 21(35)
Reprint 2001 Karl Eric Målberg
16 Check the cooling water level
The engine cooling water level should be checked each time the fuel tank is filled.
Water is added through the filler opening on the top of the radiator. Be careful when
you remove the radiator cap. There are two positions on the cap, one to decrease
pressure in the system and a second position to remove the cap.
In order to avoid deposits in the cooling system, only clean water should be used (not
containing calcium or iron) together with some rust preventing agent. Rust
preventive agent with a mineral oil base must not be used since it can damage the
hoses. See page 31 for anti-freeze
Never add cold water to a hot engine. The sudden difference in temperature can
cause cracks in the cast material.
17 Clean the cooling system
If the cooling system is to function in an effective manner, all the channels in the
engine and the radiator must be free from deposit and impurities. The deposits that
build up consist of the salts always present in normal water.
Cleaning can conveniently be carried out in connection with filling or draining of anti-
freeze in the fall and spring (see page 31) If necessary, however, the cooling system
can be cleaned more often.
18 Check the spark plugs
The spark plugs should be cleaned at a Volvo workshop after every 3,000 miles
(5,000 km) and the electrode gaps are checked at the same time.
The plugs can be cleaned by using a brush or a sand blaster and should the be
blown clean with compressed air. The electrode gap should be 0.028” (0.7 mm). After
the spark plugs have been cleaned and adjusted they should be tested in a spark
plug tester.
19 Replace the spark plugs
When the electrodes have been burnt down by about 50%ö all the spark plugs
should be replaced. This corresponds to about 12,500 miles (20,000 km). This
replacement should preferably be carried out at a Volvo workshop since the spark
plugs should be tightened with a torque wrench.
When fitting new spark plugs, make sure that you fit the right type (see page 32).
20 Ignition system
The distributor contact breaker gap and the engine ignition timing setting should be
checked at a workshop after every 3,000 miles (5,000 km).
All adjusting work in the engine ignition system should be carried out by a workshop
owning the correct equipment for this work. A distributor is among the most sensitive
units in the engine and careless handling can lead to decreased engine output, high
fuel consumption, in the worst case, serious damage to the engine
21 Carburettors
The engine is fitted with a carburettor system consisting of two coupled SU
carburettors of the horizontal type. The carburettor throttles are connected by means