Man D2862 LE221 - Page 329

CRANKMECHANISM
Detachingthepistons
Removingthepistonpin
•Marktherelativepositionsofthepiston(2),piston
pin(4)andconnectingrod(5)
•Detachtheinternalcirclips(1)and(3)
•Pressthepistonpin(4)outofthepiston(2)
•Removethepiston(2)
Measuringthepistons,pistonringsand
connectingrods
Measuringthepistonpins
•Measurethepistonpin(1)usingamicrometer(2)
Ifthedimensionofthepistonpin(1)isoutof
tolerance(54.994–55.000mm),tanewpiston
withpistonpin(1).
Measuringthepistonringaxialplay
Note
Theaxialplaycannotbemeasuredonthe
keystonering
•Measuretheaxialplaybetweenthe
double-bevelledring(3)andthepiston(4)
atseveralpointsusingtheFeelergauge[139](1)
•Measuretheaxialplaybetweenthetaper-facering
(2)andthepiston(4)atseveralpointsusingthe
Feelergauge[139](1)
Theaxialplayonthedouble-bevelledring(3)must
be0.040–0.085mm.
Theaxialplayonthetaper-facering(2)mustbe0.09
–0.18mm.
Iftheaxialplayisoutoftolerance,tanewpiston
andpistonrings.
AE63stedition327