ENGINE REPAIR 6A-99
Mechanical rectifying of crankshaft journal
NOTE:
•The rectified journal will be identified by a letter engraved
in arm n° 1 of the crankshaft:
For rectified journal of connecting rod: letter (M).
For rectified journal of main bearing : letter (B).
For rectified journal of connecting rod and main bearing:
letter (MB).
•After rectifying journal of connecting rod and main
bearing, rectify the journal throats
•There are two possibilities of oversize rectifying: 0,254
mm and 0,508 mm.
•If both, connecting rod journal of and main bearing journal
are rectified,apply identical oversize to both of them.
1) Carry out mechanical rectifying of connecting rod and main
bearing journal to the data sketched in the drawings " PRIN-
CIPAL DATA ABOUT JOURNAL" and "CRANKSHAFT PRIN-
CIPAL TOLERANCES".
For cilindrado, follow the rules described next.
It forces of compressure:
• 1
st
main bearing journal 925 ± 25 Kg.
• 2
nd
, 3
rd
, 4
th
and 5
th
main bearing journal 1850 ± 50 Kg.
• 1
st
y 4
th
connecting rod journal 1850 ± 50 Kg.
• 2
nd
and 3
rd
connecting rod journal 2040 ± 50 Kg.
• Turns for compressure: 3 of approaching, 12 real and 3 of
leaving.
• Speed of compressure: 56 turns/min.
• Height decrease of throats connecting rod journal after the
compressure: 0,15 ÷ 0,35 * mm.
• Height decrease of throats main bearing journal after the
compressure: 0,15 - 0,35 * mm.
* measured using needles of graduated ball bearings with
diameter 2.5 mm.
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