Kellym
Joined: 10 Jan 2006
Posts: 1700
Location: Sun Lakes AZ
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 Posted: Mon Mar 16, 2015 4:54 pm Post subject: Cylinder stud repair |
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There are several ways to remove a broken stud. I would consult with a
respected engine shop, like Barrett Performance, Lycon, Mattictuck, or
case overhauler such as Divco as to how they recommend removing the
broken stud, and consider also removing the other studs for that
cylinder, depending on very close examination with ten power magnifying
lens and/or some form of non-destructive testing to ensure nothing is
wrong with those studs.
As to reassemble on the airframe, Mike may be right about big
Continentals in Beech or Cessna airframes, particularly the cradle type
mount, but he is full of horse feathers on a Lycoming on a Dynafocal
mount.You just need the right cylinder wrenches and a good torque wrench
with long enough handle for the torque needed. The most important item
is to not move the crankshaft/prop when there is no torque on the
through bolts. Position the prop before removing torque to where it is
needed to remove that cylinder. If more needs to come apart, use torque
plate or stack of washers and nuts to retorque the case before moving to
another cylinder. Keeps the bearings secured in position.
On 3/16/2015 5:05 PM, Carl Froehlich wrote:
| Quote: |
I’ll defer to the guru mechanics out there, but if it was my plane the
engine would get pulled, disassembled and repaired as needed. I would
assume other bolts that had taken up the load of those bolts that you
found loose had deformed – and perhaps this is what caused your
sheared bolt.
Note – Mike Busch has voiced his opinion (which I agree with) that
engine cylinders cannot be properly removed/replace without removing
the engine from the aircraft as this impedes achieving correct
cylinder bolt torque.
Carl
*From:*owner-rv-list-server(at)matronics.com
[mailto:owner-rv-list-server(at)matronics.com] *On Behalf Of *d wntzl
*Sent:* Monday, March 16, 2015 12:45 PM
*To:* rv-list(at)matronics.com
*Subject:* Re: RV-List Digest: 0 Msgs - 03/15/15
Lycoming Cylinder problem
Hello fellow RV'rs, Looking for advice, here's my situation \
problem. (I have an RV6, w an 0-320 A2B which was installed rebuilt,
modified to 160 HP, during construction about 700 hrs ago). It has
been running great, but I have been seeing a couple of small oil
leaks, (which have gotten to be quite annoying.) While doing an oil
change recently, I discovered one of the top cylinder bolts (small one
- not the larger thru bolts) had sheared off. I had not done anything
to it whatsoever, nor was there any evidence of looseness or an oil
leak in that area, the broken part was just sitting there, I then
jiggled the other upper bolts by hand and . . . 2 of them were just
finger tight!. Someone (a local A&P) suggested that a good welder
could weld a nut to the broken stud and remove it that way - but that
sounds way to "scary" to me.
Any advice appreciated. Also . . . is the plane grounded until the
repair??
Thanks in advance
David Wentzell - N233DW
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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