Volvo Penta D4 Operator's Manual page 55

3.
1.
4.
2.
Checking the exhaust line.
The exhaust line of drive installations must be inspec-
ted every year with respect to corrosion between the
hose (1) and the pipe (2).
WARNING! Risk of water entering. The exhaust
line must be inspected while the boat is on land.
5.
In case of serious corrosion damage, the pipe
must be repaired or replaced with a new one.
To check: Undo the clamps (3) and (4) holding the
hose (1). Detach the hose. Check the contact surface
(5). In case of serious corrosion damage, the pipe
must be repaired or replaced with a new one.
Checking drive belts
WARNING! Stop the engine before commen-
cing maintenance work.
General
Check belt tension and condition regularly. If the belt
is too taut it can damage bearings and if it is too loose
it may slip.
Therefore, check the belt tension regularly. Check
and adjust after operation when the belt is warm.
IMPORTANT ! Always change a belt that ap-
pears worn or is cracked (belts working in pairs
must be replaced together).
Adjusting/replacing drive belts.
The standard generator and water pump are driven by
a poly-V belt for optimum function and service life.
Change/tension the belt as follows:
1. Undo the bolts (1) on the tensioning roller bracket.
Remove and change the belt if necessary.
2. Tension the belt to apply a torque of 70 Nm on the
tensioning roller square fitting (2). Secure the ten-
sioning roller with the bolts (1). The bolts must be
torque tightened to 50 Nm.
3. Undo the bolts (1) when warm and repeat the belt
tensioning procedure.
Maintenance. Engine general
53