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(v) If two or more tanks are installed, they should be connected by
2in (51 mm) bore pipes (C). The top connecting pipe should be
below the level of the previous top connection. The bottom
connecting pipe should be about 2in (51mm) from the base.
(vi) A tap should be fitted in the inlet water pipe (D) to the bottom of
the cylinder This is to control the temperature of the cooling
water from the engine at no greater than 95° C (203° F) or less
than 75° C (167°F) Pipes should be too hot to hold b ut the water
should not boil.
(vii) Under low temperature conditions it is advisable to use an anti-
freeze mixture in the cooling tank Make sure that the anti-freeze
used is suitable for aluminium alloy engines and contains the
correct corrosion inhibitor. Do not allow the antifreeze mixture to
remain in the cooling system for more than six months or the
corrosion inhibitor may deteriorate When necessary drain the
cooling system and refill with a new antifreeze mixture.
(viii) Do not mix different grades of anti-freeze and always top up
with a mixture of the same strength. Make sure that the mixture
is suitable for the coldest conditions likely to be encountered
6. Lubrication
(a) The engine oils listed under Approved Lubricants are heavy duty oils
with a minimum performance level as specified by:
British Defence Specification No. 21010
or U.S. Specification MIL/L/2104B
(b) Suitable additional heavy duty engine oils will be recommended by a
local oil distributor but a minimum performance level as above must be
specified.
Petters Ltd or their agents should be consulted if doubt arises regarding
(c)
the selection of an engine oil
MARINE AUXILIARY INSTALLATIONS. Although two viscosities of oil
(d)
are recommended for different climatic conditions, it is not always
fig. 1
14
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