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service manual
mod. 051135
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6.2.5 Dimensional check and overhaul of
crankshaft
1 - Wash the crankshaft thoroughly using
suitable detergent.
2 - Introduce a pipe cleaner into the lubrication
ducts to remove any residual dirt.
3 - Blow compressed air into the points
indicated to free the ducts from oil.
4 - Check the surfaces of the main journals
and crank pins for wear and tear to see
whether grinding is necessary.
5 - Using a micrometer, measure the diameter
of the main journals (A1) and crank pins
(B1).
Important
– Crankshaft half bearings cannot be
replaced separately.
– If the crankshaft needs to be ground,
establish the diameters of the
connecting rod and crank pins, in order
to choose the matching measurements
available of connecting rod and half
bearing spare parts (see “Table of
diameters of connecting rods and half
bearings”).
– When grinding the crankshaft it is
possible to downrate the crankshaft and
connecting rod pins by 0,25 mm and
0,50 mm.
– When grinding the crankshaft it is also
necessary to consider grinding the sides
(shoulder) to be able to choose uprated
ring replacements (see “Table of
uprated shoulder half-rings”).
Important
Protect the contact surfaces with lubricant
oil, to prevent them from rusting.
Table of diameters of connecting rods and half bearings
Table of uprated shoulder half-rings
Dimensions
(mm)
Clearance (mm)
Wear &
tear limit
(mm)
wear &
tear lim
(mm)
Ref.
Half-rings
Standard
1° increase
2° increase
3° increase
Dimensions (mm)
Clearance
OVERHAULS AND TUNING
Содержание LDW 502
Страница 1: ...SERVICE MANUAL code 1 5302 727 ...
Страница 8: ... 8 service manual mod 051135 Notes GENERAL REMARKS AND SAFETY ...
Страница 22: ... 22 service manual mod 051135 2 Notes TECHNICAL INFORMATION ...
Страница 24: ... 24 service manual mod 051135 3 MALFUNCTIONS ...
Страница 28: ... 28 service manual mod 051135 4 STORING THE ENGINE ...
Страница 62: ... 62 service manual mod 051135 6 OVERHAULS AND TUNING ...
Страница 82: ... 82 service manual mod 051135 7 Notes INSTALLATION OF ASSEMBLIES ...
Страница 94: ... 94 service manual mod 051135 8 Notes REPLACING PARTS ...
Страница 98: ...SERVICE MANUAL code 1 5302 727 ...
