PAGE 91 © Copyright Hewland Engineering Limited 2001-2009
FTR Technical Bulletin No. FTR-015
Pinion Bearing Nut Revision
Some customers have reported instances of the pinion bearing nut FGA-222-1A coming loose, during
gearbox operation. In an effort to alleviate the loosening of the locknut, the design has been enhanced,
increasing its radial thickness, length, and the material specification.
This modification has also enabled us to incorporate the washer HC8-222-2A into the locknut, so making
the washer redundant.
The latest design of locknut has been re-numbered as NUT-031, and the relevant tightening torque has
been increased to 150 lbs.ft (205 Nm).
As on the earlier locknut, the outside face is grooved, so leaving a thin section which must
be peened
over in two positions, into the corresponding grooves machined into the bearings threaded diameter.
The locknut must also be fitted using loctite 2701 thread lock.
If for any reason the locknut is fully fitted (i.e. peened over), and subsequently removed, we would
recommend that a new locknut be fitted.
N.B. These changes do not apply to Formula BMW applications.
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