MAK M20 - Page 273

Main Bearings
Inspection / Disassembly
A5.05. 02.05.01.01
15000, 30000
M20
en / 30.05.2000 IB021418 5/5
02
Ĺ
1.8 Insert dog (Fig. 6/W7) into oil bore of
the crankshaft and twist out top bearing
shell to the exhaust side.
1.9 Check AL-groove bearings in
accordance with rating criteria
02.03.09.nn.
1.10 In the case of 2-material bearings, check
wearing of the wall-thickness in the
main load region at check points
(Fig. 7/X) with micrometer caliper.
Wear = new dimension -
actual dimension
New dimension: 4.927
-0.015
mm
In the case of a wear of > 0.05 mm the
bearing shells are to be changed.
Further rating criteria, 02.03.07.nn.
Attention:
If a bearing shell has to be changed
during inspection, the adjacent
bearings are also to be checked.
Fig. 6
W7
Fig. 7
X