Volvo D20 - Page 33

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Group 21 Reconditioning engine
Cleaning, checking
Remove piston rings from piston
U se piston ring pliers.
Oisassemble connecting rods - pistons
CS
C6
Remove circlips from gudgeon / piston pins with a
small screwdriver. Push out pins with a suitable drift . If
difficult to remove, heat pistons to approx. 60°C
(140·F).
C7
CJean pistons
Remove carbon deposits. Use agroove cleaneror part
of aground piston ring to cl ea n grooves.
CB
Check pistons
Check for cracks, wear etc.
Pistons
with rounded top edges must not be reused.
(Since this is caused by defective injectors, the injec-
tors should be checkedlreconditioned as weil.)
Measure piston ring side clearance
Use a feeler gauge.
Upper
compres·
Side clear.nee mm Uni
N.w
mm Uni
Mu
mm {ini
C9
sion ring ............. 0.06-0.09 (0 .0 024-0.00351 0.2 (0.0079)
Lower compres-
sion
ring .............. 0.05-0.08 (0.00 20 -0 .0031 ) 0.2 (0.0079)
Oil screper
ring ...................... 0.03--0.06 (0.0012-0.0024) 0.'5 (0.0060)
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