Volvo B27A Service Manual page 28

Group 21 Reconditioning engine
Cleaning, checking
C. Cleaning, checking
C1
Check type of piston and cylinder liner
Pistons and liners are matched sets, based on diameter.
Three types are available as follows:
Liner, marking
1 notch
2 notches
3 notches
Piston, marking
A
B
C
m~^i
Demolin
Check make of pistons
B 27 engines = Demolin or Mahle.
B 28 engines = Mahle.
C2
Mahle
7U.
la to.
Mahle
8 mm
• SZZ\ •
4
N
^ ^
f \
•* Demolin "
i ''
1
I I
8,5 mm
11 mm(B27F 1976-1978)
C3
Measure piston diameter
Measure at right angles t o gudgeon (piston) pin
bore.
Diameter must be measured at different heights
depending on make and model year.
• All Mahle pistons = 8 mm (0.31 in) from lower
edge
• B27F 1976-1978 with Demolin pistons = 11 mm
(0.43 in) from lower edge
• Other Demolin pistons = 8.5 mm (0.33 in) from lower
edge of oil ring groove.
See specifications on pages 4-5 for diameters of new
parts.
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