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As mentioned here in the last few weeks, I've had a retract cylinder
internal leakage problem that resulted in hydro pump "pulses" every few
seconds. After isolating the offending cylinder (the right main) and
obtaining the required rebuild kits from Lancair, I proceeded to undertake
the rebuild of that cylinder.

After disassembling the offending unit, I started the overhaul process. All
went OK until I tried to insert the main piston in the barrel. On each side
of the "T" shaped main seal, very thin split keepers (phenolic maybe) are
installed that are about the same thickness as the snap-ring grooves in the
cylinder ID. Sliding the new seal and keepers into the cylinder, the
"keepers" would inevitably pop into the grooves and the piston would go no
further without damaging the keepers. After sacrificing the first set,
trying to get the keepers past the grooves, I installed the set from my
second rebuild kit and after about an hour of twisting and cussing, they
finally slid past and into the cylinder bore.

A test of the rebuilt cylinder shows that the internal leak is fixed and the
gear works properly - however - is anyone out there knowlegable on the
correct technique for getting the cylinder back together without this
problem? I'm sure that it's just a matter of time before I will need to
overhaul another cylinder - and I really don't want to have the same
reassembly problems I have had with this one.

Dan Schaefer


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Please send your photos and drawings to marvkaye@olsusa.com.
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