max
Joined: 01 Jun 2013
Posts: 4
Location: Bend OR
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 Posted: Thu Mar 19, 2015 5:56 am Post subject: RV-List Digest: 4 Msgs - 03/16/15 |
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Dave,
I would not even run your engine with broken cylinder hold down bolts, never mind fly in it.
As an A&P since 1976, That cylinder has to come off and all of the nuts/ studs/ bolts that were loose, I would replace. I'd also inspect all of the rest with a dye penetrate black light inspection and magnifying glass. ANY SUSPECT STUDS/ BOLTS that look even a little wonky (very technical term) Replace them. If your not comfortable doing the work, Pull the engine and have an engine shop do the work.
Check ALL of the cylinder hold down bolts on all of the cylinders. Anything loose? Fix them.
The bolts are a very intricate part of the engine. They go through hell, trying to hold the engine together as it's trying to ripe itself apart. Treat them with respect and while your at it, take a real good look at that cylinder for cracks around the mounting flange. It now has been subjected to allot more vibration/ movement then it was designed for. The flange may not be straight and the bolt holes may have elongated. Check for cracks here as well.
As for not pulling the engine to do the work, I've pulled many of cylinders and it's an approved method of repair. That being said, I've also pulled 2 engines to do the work just because we pulled more then 2 cylinders and it was way easier to do it that way. Your results may vary.
Don't fly it till it's fixed.
--
Thomas Phy, A&P
President/ Technical
Counselor
EAA Chapter 1345
Bend OR
RV-7 Builder (repeat offender)
541-306-1500
[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
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
[b]
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