Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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Dated : 28/10/2014
Issued By: AS
Page: 101 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
7.1.2 Connecting rods
Figure 117
– Blueing Bearings, Assembling Rods
Apply bearing blue to the back of the big end shells and fit them to the rods, hold the connecting rod in
the padded jaws of a vice and tighten the cap screws to 18 ft lb in 2 stages.
Loosen one big end cap screw then measure the bearing crush as the gap between the other side of
the rod and the bearing cap with a feeler gauge. Bearing crush should be in the range given in Table
12. If the bearing crush exceeds these limits it can be corrected by carefully sanding the ends of the
bearing shells on a sheet of 600 grit sandpaper laid on a flat surface and then rechecking. Remember
that altering bearing crush will also alter the big end size slightly, so it must be re-measured after
adjusting the crush. Also note that the critical parameter to be considered is the bearing-crank
clearance. In most cases it is best to check the clearances first and then confirm acceptable crush.
Figure 118
– Measuring Connecting Rods
Retighten the cap screws to 18 ft lb then measure and record the big end size of each connecting rod
and each big end journal. Calculate the big end bearing clearance. If necessary, move the connecting
rods from one journal to another until you get a uniform clearance in the range given in Table 12.
Record the clearances on the build sheet. A typical crankshaft journal will measure around 45.00mm,
requiring a typical big end bearing inner diameter of 45.04
– 45.06mm (see Table 10 for details). Again
Blue the back of the shells
Torque the big end cap screws
Measure the bearing crush
Measure the big end size
