36
Group 21 Short block
Checking the big end bearing
clearance
Special tools: 856 927
The big-end bearing radial play can be checked by us-
ing plastigauge 856 927 as follows:
1. Wipe off any oil from the big end bearing and big
end journal. Apply a piece of plastigauge the
same length as the width of the bearing along the
big-end journal. Avoid the oil hole.
2. Mount the con rod and bearing cap (observe the
markings) and tighten the conrod bolts.
Tightening torque, please refer to the “Technical
Data” chapter.
NOTE! Do not rotate the con rod or crankshaft during
measurement, since this spoils the measurement
strip.
3. Remove the big end cap and measure the width of
the pressed-out measurement putty at the widest
point. Use the scale supplied with the plastigauge.
Max permissible big end bearing clearance,
please refer to the “Technical Data”.
Change the big-end bearing if the bearing clearance
exceeds the permissible value. The big-end journal
can be ground to an undersize if required and a
corresponding oversize bearing shell fitted. The
big-end bearings are available in two oversizes.
NOTE! After grinding the bearing journals, check the
bearing clearance again before assembly.
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