maybe I missed something. Has cause been
found on the lifter problem? Is there a known serial number range
that has the problem?
This lifter problem has not been that consistent and has shown up randomly.
I first heard about it a couple of years ago in the Duke Lycoming
engines. My understanding is that Eaton Corp. and very large supplier of
Cam/Lifters to both Lyc. and TCM as well as many automotive engines, along
with other parts. So Eaton is the source of the parts. I have heard that after
they changed form having them built in Brazil to the Chek Republic that they
started having some lifters disintegrate. Looks like shattering from being
brittle/too hard. I suspect that Eaton pays for some of the warrantee claims.
But no one is talking.
Could someone tell me if us IO550 owners should be
concerned about our pistons if we're not turbocharged? (Refering to the stamped
pistons).
Don Grabiel ES N722B
I think most of the piston problems have been in the turbocharged engines
but the first SB was for the stamps on the top edge of the pistons and they
could cause a problem. All 550's have the longer stroke and have different
pistons with the thinner tops. If you do the Topcare inspections than it can be
watched with the borescope.
Jim
Jim,
Be sure to give us an update on
the lifter
disintegration problem. Of the five other engines
you
mention, is problem only with the
TSIO-550E????
Art Jensen
I know of a Baron engine
that had the same problem IO 550 and some Duke Lyc. They turn at a higher RPM
and that must be hard on Lifters. Other folks may know more than me on
this?
Jim
Jim,
The CSB specifically
states to return all affected piston stock to TCM for
replacement. Again, the
date of this CSB is July 2004. Looks like we are not
the only ones caught off
guard.
Ed Rosiak
That was when they were talking
about the Top of the piston. Then they started stamping them on the bottom wrist
pin boss. Now those are not good and if found should or must be replaced
according to TCM. Not an AD though.
Jim Hergert
N6XE (An
Sexy)