There is one problem in this application Bill. there is not enough meat
around the hole for an insert. There is only 16 MM of meat beyond
the edge
of the hole. That is marginal for an insert IMHO.
Paul Lamar ...No rotor no motor.
Paul,
16mm is more that enough material for a insert. We are talking about the
bottom rail for the oil pan correct? there is enough material for a
Heli-coil, and since the Timesert will work with the same size tap it
will work also. I understand what you mean, as the much larger Keenserts
wouldn't fit. The TimeSert will fit no problem. We would put the 6mm
Time Serts into the cam shaft cap housings which weren't wider than 10mm
wide. They worked great. The bottom pan bolts are 6mm right? I'll get
one from my collection this weekend and send it to you, good thing to
see it in the metal so to speak.
Bill Jepson
For some strange reason I cannot access that timesert web site so I have
no dimensions.
Paul Lamar ...No rotor no motor.
Paul, The data from the Time Sert site for the 6mm x 1.0 is counter bore
dia is .319 in. [8.1 mm](there is a small flange at the top of the Time
Sert
insert)
depth of the counter bore is only .075 in. The tap drill for the tap
used is
.249 in. and the major diameter of the tap is only .290 in. All the Time
Sert
kits come with a drill, a counterbore tool, a tap, and a insert driver.
The last
is really just a common roll tap for the size. When the flange bottoms out
the roll tap forms the last 1-1/2 threads and swages the insert in.
The url again is
www.timesert.com <http://www.timesert.com/>
<http://www.timesert.com/>
Bill Jepson
I think a counter bore would be a problem for Mark. To install a heli
coil he
would not have to remove the engine. I think the heli coil tap just goes
into
the stripped out 6 mm hole. Also there is the issue of the cost of the kit.
What does a timsert kit cost?
Paul Lamar ...No rotor no motor.
If he didn't want to remove the pan yes. I wouldn't do any important
repair without removing the pan. Just my preference. Don't know the
current pricing on the kits. They were less than $100 with several
different sizes. If it is a problem I could probably loan the kit if he
can remove the pan, if everything is still in the tool box that is.
Bill jepson
He might be able to get the pan off with the engine still in the airplane
as he has a unique schertz beam set up.
-- Paul Lamar ...No rotor no motor.
Paul, yes that is the setup that Jerry didn't want to stay with for some
reason. Looks like a good setup to me. I won't be at my shop until this
week end, but if he hasn't decided by then I'll see what I still have. I
strongly believe this to be the best thread repair available. Recently
they have been selected by GM as the only approved thread repair for the
aluminum engines. They will be around for a while!
Bill Jepson
Ok guys,
Seems silly to me, but the amount of time discussing the pro's and con's of
inserts.... we could have put helicoils in everyone's engines by now...
Helicoils or Timeserts work fine. Timeserts are easiest to install once the
hole is finished and counterbored. The big advantage to heli coils is the
availability is everywhere and they are not expensive. Take some care
installing them and your back to flying in no time.
As an important note to anyone using their pan bolts as part of the engine
mount system, install timeserts or helicoils in all aluminum holes being
used before installing the engine. It is just good insurance against future
failure.
Larry
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