Volvo Penta 230 Workshop Manual page 15

Cylinder block
Material ................................................................................................
Bore, standard .....................................................................................
Bore, oversize 1 ..................................................................................
Bore, oversize 2 ..................................................................................
The cylinder bores should be bored at a wear depth of 0.10 mm
(0.004 in) (in case the engine has an abnormal oil consumption).
Pistons
Material ................................................................................................
Overall height 230, AQ131 ..................................................................
Overall height 250, 251DOHC, AQ151, AQ171 ..................................
Height from gudgeon pin center to top of piston
230, AQ131 .........................................................................................
Height from gudgeon pin center to top of piston
250, 251 DOHC, AQ151, AQ171 ........................................................
Piston clearance, production ...............................................................
Piston clearance, service ....................................................................
Piston, standard dimension .................................................................
Piston, oversize 1 ................................................................................
Piston, oversize 2 ................................................................................
3) Maximum weight difference between pistons in the same engine is 16 grams (0.56 oz).
4)
See the spare parts catalog for all the products.
Piston rings
Piston ring end gap (oil scraper ring) ...................................................
Piston ring end gap (compression ring) ...............................................
Oversize piston rings 1 .......................................................................
Oversize piston rings 2 .......................................................................
Compression rings
The upper ring is chromium plated. The lower ring is marked "TOP".
Number of rings on each piston ...........................................................
Height, upper .......................................................................................
Height, lower .......................................................................................
Piston ring clearance in groove, upper ................................................
Piston ring clearance in groove, lower .................................................
Oil scraper rings
Number on each piston .......................................................................
Height ..................................................................................................
Gudgeon pins
Full floating pin. Locked at both ends with circlips.
Fit in connecting rod ............................................................................
Fit in piston ..........................................................................................
Standard diameter ...............................................................................
Oversize diameter ...............................................................................
Length .................................................................................................
Cast iron
96.00–96.03 mm (3.7795–3.7807")
96.300 mm (3.79133")
96.600 mm (3.80315")
Light alloy 3)
64.7 mm (2.54724")
61.7 mm (2.42913")
39.7 mm (1.56299")
36.7 mm (1.44488")
0.010–0.030 mm (0.0004–0.0012")
max 0.080 mm (0.0031")
95.980–96.010 mm 4) (3.779–3.780")
96.280–96.290 mm (3.791–3.7909")
96.580–96.590 mm (3.802–3.803")
0.30–0.60 mm (0.0118–0.0236")
0.30–0.55 mm (0.0118–0.0217")
0.3 mm (0.0118")
0.6 mm (0.0236")
2
1.728–1.740 mm (0.068–0.069")
1.728–1.740 mm (0.068–0.069")
0.040–0.072 mm (0.0016–0.0028")
0.040–0.072 mm (0.0016–0.0028")
1
3.475–3.490 mm (0.1368–0.374")
Light thumb pressure (push fit)
Thumb pressure (slide fit)
23.0 mm (0.906")
23.05 mm (0.907")
65 mm (2.559")
13