Volvo Penta AQ125A, Workshop Manual

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135. Fit a new rubber ring and gasket on the circula-
tion pump. Fit the pump to the engine. Press the
pump upwards against the cylinder head and
tighten the screws and nuts.
136. Fit the cover (with the firing position marking).
Valve adjustment
137. Lift off the valve cover. Turn the camshaft to the
position for firing on No. 1 cylinder. Both the cams
for No. 1 cylinder point obliquely upward at equal
angles. The timing pulley’s timing position is 0°.
NOTE! Always turn on the crankshaft’s centre
screw.
138. Measure the valve clearance with a feeler gauge
for No. 1 cylinder.
Clearance when checking:
Cold engine: 0.25–0.45 mm (0.010–0.018 in.)
Hot engine:
0.30–0.50 mm (0.012–0.020 in.)
adjustment not necessary
Clearance when adjusting:
Cold engine: 0.35–0.40 mm (0.014–0.016 in.)
Hot engine:
0.40–0.45 mm (0.016–0.018 in.)
The clearance is the same for inlet and exhaust
valves.