Be gentle, any method that preserves the thread in gear case is a good method AND any method that messes up the gear case thread is BAD.
The cover is stuck either because it was installed tightly OR because
threads are corroded…most likely corrosion ,which may mean the
thread strength is compromised. Some combination of heat, solvent
and percussion may unlock the corrosion locking cover thread to
gear case thread allowing the cover to be worked loose and removed,
A cover with clean thread and a gear case with clean thread (both
greased) can be installed and remove with only finger pressure,,,no
special tool needed. The difference between the effort needed to remove a stuck cover and a cover that is easily turned has to be
either the force used to install it or corrosion, If you are going to have
a replacement cover made the old cover can serve as the pattern
to follow in machine the replacement. Easier if the cover is intact not
in fragments.
Gear case and covers for KE4 thru KG4 vary in some details ,but, share the same thread. and same problems.
Louis
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