Volvo Penta AQ125A, Workshop Manual

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Technical data
AQ145B, AQ125B
General
Type designation ............................................................ AQ145B AQ125B
Type of operation ............................................................ 4 stroke overhead
Max. effekt 1) kW (Hp) ....................................................... 102 (139 hp) 88 (120 hp)
Full throttle operation range ............................................ 4800–5500 r/m 4700–5000 r/m
Max. cruising speed ........................................................ 200 r/m (below max. speed reached)
Compression ratio ........................................................... 9.7:1 9.5:1
Compression pressure at starter motor speed
2)
.............. 9–11 kp/cm
2
(128–156 psi)
No. of cylinders ............................................................... 4 in line
Bore .............................................................................. 96 mm (3.7795 in.)
Stroke .............................................................................. 80 mm (3.150 in.)
Displacement .................................................................. 2.315 dm 3 (141.271 cu.in.)
Weight incl. drive without oil and water, approx .............. 250 kg (550 lb.) 240 kg (518 lb.)
Idling speed .................................................................... (900 r/m)
CYLINDERBLOCK
Material ........................................................................... Cast iron
Bore, standard ................................................................. 96.00–96.03 mm (3.7795–3.7898 in.)
Bore, oversize 1 .............................................................. 96.300 mm (3.7913 in.)
Bore, oversize 2 .............................................................. 96.600 mm (3.8031 in.)
The cylinder bores are to be rebored when the wear is
0.10 mm (0.004 in.) (if the engine has excessive
oil consumption).
PISTONS
Material ........................................................................... Light alloy 3)
Height total ...................................................................... 64.7 mm (2.547 in.)
Height from gudgeon pin centre to piston top ................. 39.7 mm (1.563 in.)
Piston clearance ............................................................. 0.010–0.030 mm (0.0004–0.0012 in.)
Piston, standard size ....................................................... 95.980–96.010 mm (3.7787–3.7799 in.)
4)5)
Piston, oversize 1 ............................................................ 96.277–96.292 mm (3.7904–3.7910 in.)
Piston, oversize 2 ............................................................ 96.577–96.592 mm (3.8022–3.8028 in.)
1) Max. flywheel output. acc. to SAE J-607.
2)
Only applies when the engine is hot, the valve completely open.
3) Maximum weight difference between pistons in the same engine is 16 grammes (0.56 ounces).
4)
See parts catalogue AQ145.
5)
See parts catalogue AQ125.