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Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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6 7
Dated : 28/10/2014
Issued By: AS
Page: 103 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
dowel side of the connecting rod facing towards the rear of the engine (towards the flywheel). Engine
oil should also be applied to the connection.
Press the rod and the bearing cap together by hand or gently with a pair of multigrips. This must be
done to seal the connection between cap and rod
– if the cap is not fitted against the rod when Loctite is
applied to the threads then a small amount of the retaining compound can find its way between the
mating surfaces, holding them slightly apart and altering the fit of the rod to the crank. This can lead to
excess clearance between the rod and crank
– which is not acceptable.
Apply a smear of Loctite 620 Retainer to the first 3 threads of each cap screw and the first 3 threads in
the bearing cap then fit each pair of cap screws and tighten initially to 10 ft lbs then to the final value
given in Table 9. Perform a final check for ease of rotation: the connecting rod should move smoothly
around the big end journal.
If it does not rotate freely then the rod should be removed and inspected. Scuffing of the bearing
surfaces near the join between cap and rod will require that the connecting rod can be fully
disassembled and the big end polished in the areas adjacent to the join between rod and cap. If there
is no particular scuffing pattern then the crankshaft journal should be polished before refitting the rod
with new cap screws and retesting. In cases like this also check that the crank journal remains round.
Wipe away any excess Loctite from the end of the cap screws when fitting is complete. Note that any
excess Loctite left on these parts can harden, then break free and be carried to the oil pressure relief
valve, causing oil pressure problems later.
WARNING
Loctite and other compounds can cure quickly at times. Overhaulers must work steadily to ensure
all treated connections are tightened fully before the compound cures.
Recheck the torque for each cap screw before fitting the next connecting rod.
If the crankshaft and connecting rods assembly will be left exposed for more than an hour or so the
entire assembly should be oiled lightly and covered with a plastic bag or wrapped with a clean cloth to
prevent corrosion or dirt from taking hold.