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AB Volvo Penta / Diesel Engine TAMD71B
9.7.2 Fuel pre-filter. Installing new
inserts
Double filter: As a rule, the filter inserts should
be replaced when the pressure gauge indicates
a vacuum of 6–10 in. Hg* (idle) or 16–20 in Hg
respectively, (max. rpm, loaded engine). Howev-
er, filters must be replaced every 500 hours of
use.
Close the fuel cocks at the tank before disman-
tling the single filter or replacing the inserts of
the double filter with the engine off.
Double filter: If inserts are to be replaced when
the engine is running, shut off the filter unit with
the insert to be replaced by turning the valve
handle (1) to the horizontal position. See figure
9.10.
*Note: In. Hg = Inches of mercury.
Positions of the valve knob
Up: Normal operating position. Both filters
on line.
Right: Left side filter insert can be re-
placed.
Left: Right side filter insert can be re-
placed.
Down: Both filters are off line.
9.7 Maintenance – Fuel System
9.7.1 Checking/draining fuel
pre-filters
Check the fuel filter and drain off any water and
contaminants through the drain plug(s) (5). See
figure 9.9.
The engine should be off and allowed to stand
for a few hours before carrying out this check.
Reinstall the plugs.
5
Fig. 9.10 Double pre-filters
1. Valve knob (both filters on-line in this position)
2. Pressure gauge
3. Retaining screw
4. Cover
5. Drain plug
1
5
4
2
3
Fig. 9.9 Double pre-filters
5. Drain plug
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