Today's Message Index:
----------------------
1. 03:17 AM - Re: IO-240 BxB Engine Mount Bushings (Hans Christian Erstad)
2. 04:54 AM - Re: bushings (Owen Baker)
3. 08:57 AM - Fw: IO-240 BxB Engine Mount Bushings (Owen Baker)
Message 1
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| Subject: | Re: IO-240 BxB Engine Mount Bushings |
As far as I can remember (but it is more than 15 years ago), the engine
mount parts that came with the engine (IO-240-A) contained some pieces of
rubber hose to slide onto the spacer and between the rubber bushings (and
washers). Looking like the aircraft spruce O-200 picture on your last link.
I see no reason for having anything else than some rubber hose there.
I am still on these original parts.
Hans Christian
2015-09-15 5:03 GMT+02:00 Owen Baker <bakerocb@cox.net>:
>
> 9/14/2015
>
> Hello Keith, You wrote:
>
> 1) "... i priced it up at the beginning of this year and found them for
> 49$ from aircraft specialties
> supplies ."
>
> I ordered four 638225's from
>
> http://www.aircraft-specialties.com/
>
> on line a day or so ago at $48.45 USD only to receive a phone call saying
> that it would be several weeks before delivery so I cancelled the order. I
> am paying about $70 USD each for the ones that I was able to find on an
> extended search.
>
> 2) "Also if you can get some made i would also be happy to share the
> costs."
>
> I don't know how to start that process. I don't know who CM's supplier is.
> And the Durometer rating (hardness) of the 638225's that come from CM is
> too soft in my opinion.
>
> Also US regulations forbid making parts for US type certificated airplanes
> without FAA approval and there are type certificated airplanes (Diamond DA
> 20-C1 for one) http://www.diamondaircraft.com/aircraft/da20/technical.php
>
> that use the IO-240 B3B engine so if I were able to find someone to make
> the 638225's the maker would have to specify them as being offered only for
> non type certificated airplanes. Probably not worth the financial return
> for any potential maker.
>
> 3) "So if you come up with a solution i would be very happy to hear it"
>
> OK. Right now I am waiting for delivery of several pieces of elastomeric
> hose from McMaster Carr that I may into cut into short pieces and use as
> substitutes for 638225's. There is precedence for this as the similar part
> for mounting the O 200 engine, part number 628555-16, is just a piece of
> hose. See here:
>
>
> http://www.aircraftspruce.com/catalog/eppages/contmountparts.php?clickkey=26078
>
> OC
>
> ============================================
> From: Keith.Miller@esa.int
> Sent: Monday, September 14, 2015 5:52 AM
> To: kis-list@matronics.com
> Subject: Re: KIS-List: IO-240 BxB Engine Mount Bushings
>
>
> OC,
>
> I need to replace mine soon ( 638225 & 530740 ) . Like you I am happy to
> pay for the 530740, but the 638225 is a rip-off - i priced it up at the
> beginning of this year and found them for 49$ from aircraft specialties
> supplies .
>
> So if you come up with a solution i would be very happy to hear it .
> Also
> if you can get some made i would also be happy to share the costs.
>
> Keith
>
>
Message 2
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9/15/2015
Hello Jesse, Thanks for your input. You wrote: =9CI used hockey
pucks for my Variviggen's gear cushions and they worked like a charm. I
would like to suggest this for you mounts.=9D
Your approach is very innovative and similar to the rubber donut gear
cushions in some Mooney and Beechcraft (Sierra) airplanes. See here:
https://en.wikipedia.org/wiki/Beechcraft_Musketeer
I=99ll probably try cutting up some rubber hose material to get
the tubular elastomeric parts for the small CM (Continental Motors)
engine mounts. See reference number 1 in this schematic:
http://www.aircraftspruce.com/catalog/eppages/contmountparts.php?clickkey
=26078
OC
===================
From: Jesse Wright
Sent: Monday, September 14, 2015 12:04 PM
Subject: bushings
OC,
I used hockey pucks for my Variviggen's gear cushions and they worked
like a charm. I would like to suggest this for you mounts. Take one on
a drill press, preferably a bridgeport, drill your center hole. Then
chuck up a hole saw thats oversize of the smaller cylinder area. Cut
that one out. Then put a bolt, watered up, tightened down. Chuck this
up in your drill press and turn it down with a flat file against it
bringing it down to diameter size. Next make cut and make the larger
cylinder the same way. File them down to thickness on the drill press.
When the center holes were cut make them oversize to accommodate a steal
tube that the mounting bolts would go in so both hockey puck pieces
would mount on. You could file this, turning on the drill press, to the
exact size that could be forced in the mounting holes. When pulled down
this would further fill the hole and for a tight fit.
These pucks are made with fiber that don't come apart. I would think
they would outlast almost anything.
Another thought,
Jesse
Message 3
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| Subject: | Fw: IO-240 BxB Engine Mount Bushings |
From: Owen Baker
Sent: Tuesday, September 15, 2015 11:32 AM
; SCHERTZ BILL
Subject: Fw: IO-240 BxB Engine Mount Bushings
9/15/2015
Hello Keith, Thank you for the response and pictures. You wrote:
1) "The 530740's look in really good condition so i am not so worried
about those but my 638225's are not
looking so good."
That has also been my experience, but some of my 638225's are completely
shredded / destroyed in the removal process. My plan is to install the
638225's (if I do reinstall any) with a coating of Dow DC-4.
http://www.aircraftspruce.com/catalog/cspages/dc4.php
I think that both the 530740's and 638225's tend to regain their shape after
removal if they wait around for a few days. There is also the issue of both
of those elastomers becoming hardened with the passage of time and losing
their vibration absorption ability even when sitting on the shelf. But since
the 638225's start out being too soft in the first place I don't see that as
a problem.
2) "... i intend to replace them this year ...." and ".... where did you
eventually get the 638225's from ?"
I have ordered three 638225's from Aircraft Spruce (were not in stock --
coming from some un identified location) at $69.70 USD each and the last two
that Skygeek had in stock for $60.28 USD each. See here for their present
out of stock status:
http://www.skygeek.com/continental-motors-638225-bushing.html
No 638225's have arrived yet. BUT the eight 6 inch pieces of hose that I
ordered from McMaster Carr have arrived today and I am very pleased (Thank
you Bill Schertz). I received two pieces each of:
8637K131 75A Durometer; 86805K53 75A Durometer; 5546T53 60A Durometer; and
87235K11 40A Durometer.
http://www.mcmaster.com/
My intent is to see if I can cut pieces of the first three into suitable
lengths (approximately 1 and 1/2 inches) and bore them out to 1/2 inch inner
diameter (to fit over the center metal spacer) to use as replacements for
the 638225's. (I think the two 40A Durometer pieces are too soft.)
3) "... and have you also decided to replace the 530740's as well ?"
Yes, I have ordered and received eight 5830740's from Aircraft Spruce, along
with a 1/4 inch thick piece of aluminum bar stock that I plan to make shims
from to shim forward the bottom crankcase mounting legs (if needed) in order
to move the spinner upward. I already have in hand several shims of thinner
thickness that I have created through the years.
OC
===========================================
From: Keith.Miller@esa.int
Sent: Tuesday, September 15, 2015 4:14 AM
Subject: Re: IO-240 BxB Engine Mount Bushings
OC,
I attach a couple of pictures of my mounts . The 530740's look in
really
good condition so i am not so worried about those but my 638225's are not
looking so good . as a temp measure I swapped the mounts around ( top
mounts went bottom ) and the engine was looking a bit higher up . i intend
to replace them this year and had assumed Aircraft specialities had them in
stock , so its good that you told me they do not
(See attached file: IMG_4181.JPG)(See attached file: IMG_4203.JPG)
where did you eventually get the 638225's from ? and have you also
decided to replace the 530740's as well ?
Keith
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