V-Belts; Turbo-Compressor; Zinc Electrodes - Volvo Penta TAMD60A Instruction Book

15. V-belts, checking
After every 200 hours of operation check that the belts are
properly tensioned and that they are not worn.
It should be possible to depress the belts about 10 mm
midway between the pulleys if they are properly tensioned.
The belts for the circulation pump are tensioned, after nut
(1) has first been slackened, by moving the tensioning pul-
ley (2) outwards.
The belts for the large alternator (1600W) are tensioned af-
ter first having loosened the 4 attaching screws. For the
smaller alternators slacken the attaching screw (3) and the
tensioner bracket screw (4).
Belts operating in pairs should always be replaced simul-
taneously.
16. Turbo-compressor, checking
for leakage
Check for leakage after every 200 hours of operation. Air
leakage will lower the engine output and cause smokey ex-
haust gases.
Check that there is no leakage in the air lines by listening
carefully along them while the engine is running. A whist-
ling or hissing sound indicates leakage. Leakage can also
be detected by applying soapy water to suspected areas
on the discharge side between the turbo and the engine.
Tighten the hose clamps or replace the hose if necessary.
Any leakage in the lubricating oil and cooling water lines
must be remedied immediately in order not to impair the
function of the turbo-compressor.
17. Zinc electrodes, checking
Check the zinc electrodes after every 200 hours of opera-
tion. First close the bottom valve and drain off some of the
coolant. Screw out the electrodes and scrape or brush off
any deposits. If about 50 % of an electrode is used up, the
electrode should be replaced. Make sure when fitting an
electrode that there is good metal contact between the
electrode and the part of the engine to which it is fitted.
If any of the electrodes is not attacked by corrosion, then
the reason can be poor contact between the electrode and
the engine. Scrape the surface clean and check that the
electrode is not loose in its retainer. Replace if necessary.
Close the drain cocks, open the bottom valve. Add the drai-
ned coolant which belongs to the fresh water system. Elec-
trodes indicated by an S in the adjoining figures belong to
the seawater system and those indicated by an F to the
fresh water system.
The belts are tensioned in the same way on all engines.
AQD70, TAMD70. (The dotted line applies only to
AQD70C, TAMD70C.)
S = Electrodes in seawater system
F = Electrodes in fresh water system
TAMD60
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