Man D2862 LE221 - Page 348

CRANKMECHANISM
Checkingthemainbearingjournal
•Cleanthemainbearingjournalofthe
crankshaft(1)
•Measurethemainbearingjournalofthe
crankshaft(1)usingamicrometer(2)
•Repeatthemeasurementforeachmainbearing
journal
Thedimensionsofthecrankshaftbearingjournals
mustbewithinthespeciedtolerances,Ø111.966
–111.988mm.
Fitanewcrankshaftifthedimensionsareoutof
tolerance
Checkingtheconnectingrodbearingjournal
•Cleanthecrankshaft(1)
•Measuretheconnectingrodbearingjournalusing
amicrometer(2)
•Measuretheconnectingrodbearingjournalat
severalpoints
•Repeatthemeasurementforeachconnectingrod
bearingjournal
•Thepermittedconnectingrodbearingjournal
diameterisØ95.966–95.988mm
Fitanewcrankshaftifthedimensionsareoutof
tolerance
Installingthecrankshaft
Insertingthemainbearingshellsintothe
crankcaselowersection
•Checknoneofthettedsleeves(2)aremissing;
10items,V12enginehas14items
•ThinlyapplycleanengineoiltoMANStandard
3277onthemainbearingshells(1)
•Insertthemainbearingshells(1)intothebearing
seatsasmarkedandalignwiththeSetting
tool[149]
Insertingthemainbearingshellsintothe
crankcase
Note
Onlyusethrustwasherswiththesame
wallthickness.
•Insertthecleanedmainbearingshells(1)intothe
bearingseatsonthecrankcaseasmarkedand
alignwiththeSettingtool[149]
•LightlyapplycleanengineoiltoMANStandard
3277onthemainbearingshells(1)
•Determinethethrustwashers(2)tobeused,see
Checkingthecrankshaftaxialplay,340
•ThinlyapplycleanengineoiltoMANStandard
3277onthecleanedthrustwashers(2)
•Insertthethrustwashers(2)intothenalbearing
seatasmarked,withtheoilgroovesfacingthe
crankshaft
346AE63stedition