Volvo B27A - Page 6

Group 21 Reconditioning engine
Specifications
DEMOLIN PISTONS (B 27) B 27 A 1976-1979
B27E 1975-1978
B 27 F 1979 1976-1978
Height, overall 74 mm (2.9134 in) 63.4 mm (2.9960 in)
from gudgeon pin centre to piston crown 40 mm (1.5748 in) 39.4 mm (1.5512 in)
Weight 445±3 gram
Max weight difference between pistons in same engine 6 gram
Piston float 0.090-0.110 mm (0.0035-0.0043 in)
Piston diameter, A-marked pistons 87.900-87.910 mm (3.4606-3.4610 in)
B-marked pistons 87.910-87.920 mm (3.4610-3.4614 in)
C-marked pistons 87.920-87.930 mm (3.4614-3.4618 in)
Piston diameter is measured at right angles to gudgeon pin
bore and:
11 mm (0.43 in) from lower edge of piston for B27F
1976-1978
8.5 mm (0.33 in) from lower edge of oil scraper ring for other
engines.
Diameter, gudgeon pin bore:
Marking piston Marking gudgeon pin
1 Blue 23.514-23.517 mm (0.9257-0.9259 in)
2 White 23.511-23.514 mm (0.9256-0.9257 in)
3 Red 23.508-23.511 mm (0.9255-0.9256 in)
MAHLE PISTONS (B 27) B 27 A 1976-1979
B 27 E 1975-1978 1979-1980
B27F 1979 1976-1978
Height, overall 63,4 mm 62.2 mm 65.3 mm
(2.4960 in) (2.4488 in) (2.5709 in)
from gudgeon pin centre to piston crown 39.4 mm 38.2 mm 41.3 mm
(1.5521 in) (1.5039 in) (1.6260 in)
Weight 445±3 gram
Max weight difference between pistons in same engine 6 gram
Piston float 0.020-0.040 mm (0.0008-0.0016 in)
Piston diameter, A-marked pistons 87.970-87.980 mm (3.4634-3.4638 in)
B-marked pistons 87.980-87.990 mm (3.4638-3.4642 in)
C-marked pistons 87.990-88.000 mm (3.4642-3.4646 in)
D
-ts.
Piston diameter is measured at right-angles to gudgeon pin
bore, 8 mm (0.31 in) from bottom edge.
Diameter, gudgeon pin bore:
Marking, piston Marking, gudgeon pin
Blue Blue 23.510 mm-23.513 mm (0.9255-0.9257 in)
White White 23.507-23.510 mm (0.9254-0.9255 in)
Red Red 23.504-23.507 mm (0.9253-0.9254 in)
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