Today's Message Index:
----------------------
1. 10:21 AM - Re: Re: Eng. Mount (Doug)
2. 11:16 AM - Engine Hesitation In Flight (Andrew Dougherty)
3. 08:59 PM - Re: Engine Hesitation In Flight (Jim Ivey)
Message 1
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--> Yak-List message posted by: "Doug" <rvfltd@televar.com>
Lee,
You have a good point about the wrap ties, but what Terry was talking about
was not the tubular mount itself, but the bracket which is hard riveted into
the firewall. This is the unit that has the "ear" on it that the tubular
engine mount support attaches to via a nut/bolt. If you CJ'ers will remove
the small inspection plates just aft of the firewall, you will be able to
locate a heavy "U" channel stiffener which terminates (and is attached) at
the lower left and right engine mount brackets. Because of the downward
slope of this U channel it acts like a rain gutter for any moisture that
might have been in the past or is now leaking into the aircraft. This
moisture (rain, metal etch when painting, etc., etc., is then ducted
directly onto the lower mount bracket where the firewall acts like a dam and
holds the moisture in the back of the bracket causing the rust and
corrosion. Many of these aircraft were stored outside for many years prior
to their importation into the US. The Australians have had a large number
of problems with these lower mount brackets, far more than we have had here
in the US. So either they simply got a bad batch of aircraft or we are
simply not looking close enough. I would suggest that like the air bottle,
these little mount brackets are easily overlooked. IMHO this one time
inspection should be added to all of our inspection lists at next annual.
Also, the lower cowl bushing Terry mentioned in one of his previous posts is
the earlier smaller version that does not have the screw in rubber vibration
bushing. The earlier smaller version of the bushing was either cast in
place or the bushing was pressed in. This smaller bushing is no longer
available from the factory in China. Just as a test to see if it was
possible I agreed to take Terry's cowl brackets and attempt to turn down
the larger "screw in" type bushings on a lathe and press them into his
brackets.
Much to my surprise ( I only ruined 3 bushings learning the technique) the
job went real well, and I guess Terry liked what he received. So now there
is a solution for you guys out there in CJ land who have the smaller lower
cowl bushings.
Always yakin,
Doug Sapp
----- Original Message -----
From: "Lee Taylor " <leetay1@idcomm.com>
Subject: RE: Yak-List: Re: Eng. Mount
> --> Yak-List message posted by: "Lee Taylor " <leetay1@idcomm.com>
>
>
> Lee Taylor
> Subject: Yak-List: Re: Eng. Mount
>
>
> --> Yak-List message posted by: "Janet" <terry.lewis1@comcast.net>
>
>
> Hi All,
> You can find interesting things during an annual inspection if you dig
> deep enough.
> I decided that I was not getting a really good look at the inside of
> the lower engine mounts
> on my CJ so I got a brighter light, a bigger mirror and really cleaned
> this area.The left
> mount was fine but the right mount showed significant corrosion. It
> was covered with a layer
> of dust and oil film that hid the problem.
> Thank the Air Gods that Doug Sapp had known of this problem before and
> had one in stock.
> This piece is a bitch of a job to replace without cutting the skin but
> I had the help of an expert CJ
> mechanic that had a lot of patients. If you are not sure of the
> condition of your lower mounts
> you might want to take a look.
> Due to the downward curve of the rail that the mount rest on in the CJ
> it will collect water in this area.
> I live in south Fl. in a salty environment and that probably
> contributed to the condition.
> While we were down I found that Doug had a fix for the older smaller
> rubber cowl mounts.
> So I sent mine to him and he fixed them to like new condition with new
> inserts.
> Terry Lewis
>
> Terry (& List): (from Lee Taylor)
>
> A pet peeve of mine, since you mentioned engine mount problems,
> is how many things are attached to the engine mount struts. If you are
> using tiewraps for this purpose, Take 'em off, guys, please? Use adel
> clamps, or at least, do something to protect the mount under the
> tiewraps.
> I have replaced three engine mounts in my mechanic's lifetime,
> one where the tube was completely penetrated under the tiewrap. What
> happens is that oil naturally collects under these very tough pieces of
> nylon, dirt naturally gets in the oil, and now you have high-pressure
> forced grinding compound under those tiewraps. With the vibration that
> these mounts have to absorb, and the allways-slightly-loose fit of a
> tiewrap, (compared to the tightness of an adel clamp), this grinding
> compound WILL damage those mounts.
> Sorry, guys, one of my peeves, just don't want anyone to
> experience an engine mount break because of these quick-fix useages.
> Tie wraps have lots of legitimate uses---on engine mounts is NOT one of
> the places they can be used safely. Adel clamps, or otherwise a piece
> of tubing under the tiewrap.
> Lee T.
>
>
Message 2
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| Subject: | Engine Hesitation In Flight |
--> Yak-List message posted by: Andrew Dougherty <atdougherty@yahoo.com>
I have a re-occuring issue with my M-14 hesitating in
flight, usually just after takeoff and on the second
leg of a flight.
This has happened on four occasions now, usually as
mentioned after takeoff after the engine has run for a
while on a previous flight. Also, this usually
happens when I adjust the power to a cruise setting
from take off settings.
That being said, the last time this happened I was
about 20 minutes into the flight and in a rain shower.
I had set the power to cruise previously just after
take off and at a safe altitude.
I don't know if the precipitation was part of the
problem, has anyone else experienced this?
Dougherty, Andrew
__________________________________
http://sitebuilder.yahoo.com
Message 3
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| Subject: | Engine Hesitation In Flight |
--> Yak-List message posted by: "Jim Ivey" <jim@jimivey.com>
This is a test message to see if I in fact exist here. Changed email
clients.
I have experienced this phenomena and generated my own precipitation on
the front side of the pilot's seat. Unfortunately it was on a Comanche
and it's solution may not be applicable here. I ended up replacing all
rubber fuel lines and the problem went away.
Jim
I don't know if the precipitation was part of the
problem, has anyone else experienced this?
Dougherty, Andrew
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