Volvo Penta 230 Workshop Manual page 49

66. 251DOHC, AQ171.
IMPORTANT! Use the center bolt of the crank-
shaft to turn the crankshaft so that the mark-
ings on the toothed belt lines up with the mark-
ings of the camshaft gears and that of the
crankshaft as follows: 2 yellow lines against
the crankshaft marking (behind the pulley) and
1 line against each of the markings of the cam-
shaft gear. The marking of the pulley should
line up with 0° on the timing gear casing.
67. 251DOHC, AQ171. Loosen the Allen-head bolt
and turn the belt tensioning device in order to slack-
en the belt tension. Allen head key 8 mm. Remove
the belt.
IMPORTANT! Do not turn the crankshaft or
the camshaft while the toothed belt is re-
moved. The pistons can hit the valves!
68. 230, 250, AQ131, AQ151. Bring the engine to
TDC as under paragr. 66. Then ease off the nut of
the belt tensioning roller. Tool width: 17 mm. Pull the
belt and insert a 3 mm drill in the hole of the tension-
ing device. Then remove the belt.
NOTE! Do not turn either the crankshaft or the cam-
shaft while the belt is removed. The pistons can hit
the valves!
69. 251DOHC, AQ171. Remove the protective cover
for the spark plugs and remove the leads from the
spark plugs.
70. 251DOHC, AQ171. Remove the distributor. Tool
width 10 mm. Pull the distributor off straight back-
wards.
NOTE! Take care of the guide bushing (1).
71. Remove the thermostat housing and the thermo-
stat. Tool width: 10 mm.
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