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IO-240 BxB Engine Mount Bushings

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Fri Sep 11, 2015 8:05 am Post subject: IO-240 BxB Engine Mount Bushings

9/11/2015

  

 Hello Fellow Owners and Builders of KIS TR-1 Airplanes Powered by the  IO-240 BxB Engine, I am going through another evolution of replacing the  elastomeric bushings in this engine mount because of engine sag.

  

 I am disgusted by the cost, and general non availability of the 638225  elastomeric bushing. This is the center tubular bushing: 1/2 inch inner  diameter, 1 inch outer diameter.**

  

 I am also unhappy with the fact that the elastomeric material in this  bushing is too soft and allows almost immediate engine sag. I am considering  trying to locate some rubber hose with a 1/2 inch inner diameter and 1 inch  outer diameter and cutting it into short lengths and using that instead of the  CM part #638225.

  

 Your comments?

  

 OC

  

 **PS: Another particularly aggravating factor is the difficulty in  installing new elastomeric bushings.

  

   [quote][b]

sstearns2(at)yahoo.com
Guest

Posted: Fri Sep 11, 2015 8:15 am Post subject: IO-240 BxB Engine Mount Bushings

I think it is normal to get some sag soon after installation.  I fitted my cowl so the spinner was 1/8 inch above the cowl knowing it was going to settle some.  After flying for about 50 hours it settled to about 1/8 inch below the cowl.  I put a large area washer under each of the lower engine mount points on the firewall and that aligned the spinner and cowl.  That was 200 hours ago and no change.

Scott

        From: Owen Baker <bakerocb(at)cox.net>

 To: KIS-LIST MATRONICS <kis-list(at)matronics.com> 

 Sent: Friday, September 11, 2015 9:05 AM

 Subject: IO-240 BxB Engine Mount Bushings

    9/11/2015

 Hello Fellow Owners and Builders of KIS TR-1 Airplanes Powered by the  IO-240 BxB Engine, I am going through another evolution of replacing the  elastomeric bushings in this engine mount because of engine sag.

 I am disgusted by the cost, and general non availability of the 638225  elastomeric bushing. This is the center tubular bushing: 1/2 inch inner  diameter, 1 inch outer diameter.**

 I am also unhappy with the fact that the elastomeric material in this  bushing is too soft and allows almost immediate engine sag. I am considering  trying to locate some rubber hose with a 1/2 inch inner diameter and 1 inch  outer diameter and cutting it into short lengths and using that instead of the  CM part #638225.

 Your comments?

 OC

 **PS: Another particularly aggravating factor is the difficulty in  installing new elastomeric bushings.

    	  Quote: 	

ronics.com/Navigator?KIS-List">http://www.matronics.com/Navigator?KIS-List

matronics.com/">http://forums.matronics.com

ronics.com/contribution">http://www.matronics.com/contribution

 [quote][b]

wschertz343(at)gmail.com
Guest

Posted: Fri Sep 11, 2015 8:57 am Post subject: IO-240 BxB Engine Mount Bushings

Check McMaster Carr for different bushings. They may have something of  use.

  From: Owen Baker  (bakerocb(at)cox.net)

 Sent: Friday, September 11, 2015 10:05 AM

 To: KIS-LIST MATRONICS (kis-list(at)matronics.com) 

 Subject: IO-240 BxB Engine Mount  Bushings

    9/11/2015

 Hello Fellow Owners and Builders of KIS TR-1 Airplanes Powered by the  IO-240 BxB Engine, I am going through another evolution of replacing the  elastomeric bushings in this engine mount because of engine sag.

 I am disgusted by the cost, and general non availability of the 638225  elastomeric bushing. This is the center tubular bushing: 1/2 inch inner  diameter, 1 inch outer diameter.**

 I am also unhappy with the fact that the elastomeric material in this  bushing is too soft and allows almost immediate engine sag. I am considering  trying to locate some rubber hose with a 1/2 inch inner diameter and 1 inch  outer diameter and cutting it into short lengths and using that instead of the  CM part #638225.

 Your comments?

 OC

 **PS: Another particularly aggravating factor is the difficulty in  installing new elastomeric bushings.

[quote]

href="http://www.matronics.com/Navigator?KIS-List">http://www.matronics.com/Navigator?KIS-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/c

[b]

aeromomentum(at)yahoo.com
Guest

Posted: Fri Sep 11, 2015 9:30 am Post subject: IO-240 BxB Engine Mount Bushings

Hello OC,



Have you tried looking at airboat suppliers?  Many times they have non certified versions for a lot less money and at times harder versions.  At least for the Lycoming style I use I can get ones that are very hard made from urethane.



Someone on ebay sells Continental bushing adapters that may be of use.

http://www.ebay.com/itm/Continental-O-200-to-C-85-Engine-Mount-Adapters-O200-/270845226093



The conical rubber bushings seem to about $22.22 for 8 on ebay:

www.ebay.com/itm/Continental-A65-A75-C75-C85-C90-O-200-engine-mounting-Bushing-P-N-SA22387-/111721088071



Mark



PS: Great Kitplane's article!  Back when I was first learning to fly my instructor told me a trick so that Hobbs time could be used for flight time directly.  He said to as you start let the aircraft move forward a foot so that the aircraft is no longer in the parking position and has moved under it's own power.  I still do this today mainly as a brake test.  Then at shut down do it so that it is not in the final parking position.  This is not really an issue most of the time anyway since you normally need to push the plane back into it's parking spot.  I think this now meets the FAR's for logging flight time but feel free to correct me if I am wrong.

--------------------------------------------

On Fri, 9/11/15, Owen Baker <bakerocb(at)cox.net> wrote:



 Subject: IO-240 BxB Engine Mount Bushings

 To: "KIS-LIST MATRONICS" <kis-list(at)matronics.com>

 Date: Friday, September 11, 2015, 12:05 PM

 

 

 

 

 

 9/11/2015

  

 Hello Fellow Owners and Builders of KIS TR-1 Airplanes

 Powered by the 

 IO-240 BxB Engine, I am going through another evolution of

 replacing the 

 elastomeric bushings in this engine mount because of engine

 sag.

  

 I am disgusted by the cost, and general non

 availability of the 638225 

 elastomeric bushing. This is the center tubular bushing: 1/2

 inch inner 

 diameter, 1 inch outer diameter.**

  

 I am also unhappy with the fact that the elastomeric

 material in this 

 bushing is too soft and allows almost immediate engine sag.

 I am considering 

 trying to locate some rubber hose with a 1/2 inch inner

 diameter and 1 inch 

 outer diameter and cutting it into short lengths and using

 that instead of the 

 CM part #638225.

  

 Your comments?

  

 OC

  

 **PS: Another particularly aggravating factor is the

 difficulty in 

 installing new elastomeric bushings.

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Fri Sep 11, 2015 2:54 pm Post subject: IO-240 BxB Engine Mount Bushings

9/11/2015



Hello Mark, Thanks for your input. You wrote:



1) "Have you tried looking at airboat suppliers?"



No, I haven't. I would be willing to look in that direction if you have any 

links for me. I am not very optimistic though because the IO-240 BXB is a 

relatively recent engine in the CM line and the engine mount bosses on the 

IO-240 BXB engine crankcase are different than the engine mount bosses on 

the CM O 200 engines and their ilk which have been around a long time. 

(Because of the similar external appearance of the O 200 and the IO-240 BXB 

engine crankcases I have had many people,  including CM factory tech reps, 

make erroneous assumptions regarding engine mounting parts for the IO-240 

BXB engine.)



2) "Someone on ebay sells Continental bushing adapters that may be of use."



I found that site, including the Form 337 available on it, to be very 

interesting. But only of specific value to an O 200 engine and not the 

IO-240 BXB engine because of the different crankcase engine mount bosses on 

those two engines.



3) "The conical rubber bushings seem to about $22.22 for 8 on ebay:"



That would be a big rip off. Those rubber bushings, CM part number 22387, 

suitable for only the O 200 engine and not the IO-240 BXB engine are 

available from Aircraft Spruce for $3.55 each. See here:



http://www.aircraftspruce.com/catalog/eppages/enginemountbushings.php?clickkey=3789



But Spruce also has an O 200 conical rubber bushing with part number 

07-03493, which I think is identical to part number 22387 for $17.50. See 

reference number 4 here:**



http://www.aircraftspruce.com/catalog/eppages/contmountparts.php?recfer=14540



The comparable conical rubber bushing part made by Lord with for the IO-240 

BXB is $17.50 each from Spruce. See here:



http://www.aircraftspruce.com/catalog/eppages/lordenginemountscessna_07-01131.php?clickkey=41076



The CM version of this bushing is numbered 530740 and is available from 

Aircraft Specialties for $28.15. See here:



http://www.aircraft-specialties.com/bushing-engine-mount-530740/



And apparently from Spruce for $37.55. See here:



http://www.aircraftspruce.com/catalog/eppages/continentalnewbushing_07-03553.php?clickkey=7487



But enough about the conical rubber bushings -- my heart burn is with the 

tubular bushing, part number 638225, which does not properly support the 

heavier IO-240 engine, which costs around $70.00 each, and you have to scour 

the country side to even find 4 available from any one dealer. See here:



http://www.aircraftspruce.com/catalog/eppages/continentalnewbushing_07-04286.php?clickkey=167508



OC



**PS: Note that the tubular bushing for the O 200 ( Part number 628555-16, 

reference number 1 in this diagram) is just exactly what it says -- a chunk 

of hose. I wonder how much engineering went into that design.



==============================================



From: M Ketteing

Sent: Friday, September 11, 2015 1:30 PM

To: kis-list(at)matronics.com

Subject: Re: IO-240 BxB Engine Mount Bushings






Hello OC,



Have you tried looking at airboat suppliers?  Many times they have non 

certified versions for a lot less money and at times harder versions.  At 

least for the Lycoming style I use I can get ones that are very hard made 

from urethane.



Someone on ebay sells Continental bushing adapters that may be of use.

http://www.ebay.com/itm/Continental-O-200-to-C-85-Engine-Mount-Adapters-O200-/270845226093



The conical rubber bushings seem to about $22.22 for 8 on ebay:

www.ebay.com/itm/Continental-A65-A75-C75-C85-C90-O-200-engine-mounting-Bushing-P-N-SA22387-/111721088071



Mark



PS: Great Kitplane's article!  Back when I was first learning to fly my 

instructor told me a trick so that Hobbs time could be used for flight time 

directly.  He said to as you start let the aircraft move forward a foot so 

that the aircraft is no longer in the parking position and has moved under 

it's own power.  I still do this today mainly as a brake test.  Then at shut 

down do it so that it is not in the final parking position.  This is not 

really an issue most of the time anyway since you normally need to push the 

plane back into it's parking spot.  I think this now meets the FAR's for 

logging flight time but feel free to correct me if I am wrong.

--------------------------------------------

On Fri, 9/11/15, Owen Baker <bakerocb(at)cox.net> wrote:



Subject: IO-240 BxB Engine Mount Bushings

To: "KIS-LIST MATRONICS" <kis-list(at)matronics.com>

Date: Friday, September 11, 2015, 12:05 PM



9/11/2015



Hello Fellow Owners and Builders of KIS TR-1 Airplanes

Powered by the

IO-240 BxB Engine, I am going through another evolution of

replacing the

elastomeric bushings in this engine mount because of engine

sag.



I am disgusted by the cost, and general non

availability of the 638225

elastomeric bushing. This is the center tubular bushing: 1/2

inch inner

diameter, 1 inch outer diameter.**



I am also unhappy with the fact that the elastomeric

material in this

bushing is too soft and allows almost immediate engine sag.

I am considering

trying to locate some rubber hose with a 1/2 inch inner

diameter and 1 inch

outer diameter and cutting it into short lengths and using

that instead of the

CM part #638225.



Your comments?



OC



**PS: Another particularly aggravating factor is the

difficulty in

installing new elastomeric bushings.

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat Sep 12, 2015 4:53 am Post subject: IO-240 BxB Engine Mount Bushings

9/12/2015

  

 Hello Bill, Great suggestion â€“ many thanks. I did not find any suitable  bushings at M C, but did find and order several different lengths of hose that I  may be able to cut and turn into suitable 638225 replacements.

  

 OC

  

 ===========================

    

  From: Bill Schertz (wschertz343(at)gmail.com) 

 Sent: Friday, September 11, 2015 12:56 PM

 To: kis-list(at)matronics.com (kis-list(at)matronics.com) 

 Subject: Re: IO-240 BxB Engine Mount  Bushings

  



    Check McMaster Carr for different bushings. They may have something of  use.

    

  From: Owen Baker  (bakerocb(at)cox.net)

 Sent: Friday, September 11, 2015 10:05 AM

 To: KIS-LIST MATRONICS (kis-list(at)matronics.com) 

 Subject: IO-240 BxB Engine Mount  Bushings

  



    9/11/2015

  

 Hello Fellow Owners and Builders of KIS TR-1 Airplanes Powered by the  IO-240 BxB Engine, I am going through another evolution of replacing the  elastomeric bushings in this engine mount because of engine sag.

  

 I am disgusted by the cost, and general non availability of the 638225  elastomeric bushing. This is the center tubular bushing: 1/2 inch inner  diameter, 1 inch outer diameter.**

  

 I am also unhappy with the fact that the elastomeric material in this  bushing is too soft and allows almost immediate engine sag. I am considering  trying to locate some rubber hose with a 1/2 inch inner diameter and 1 inch  outer diameter and cutting it into short lengths and using that instead of the  CM part #638225.

  

 Your comments?

  

 OC

  

 **PS: Another particularly aggravating factor is the difficulty in  installing new elastomeric bushings.

  

 	  Quote: 	
		  

	






   [quote][b]

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat Sep 12, 2015 7:11 am Post subject: IO-240 BxB Engine Mount Bushings

9/12/2015



Hello Mark, You wrote:



1) "The conical rubber bushings on ebay are actually $1.25 each.  But with 

shipping the total is $22.22 for 8."



Right you are, and that is a good price for those who can use the 22387 

bushing.



2) "If the O-200 adapters do not work could something similar be made for 

the IO-240 BXB?"



Maybe, but the real issue is not the configuration, cost (approximately 

$17.50), and availability of the CM part number 530740 (or its Lord J3608-1 

substitute) end bushing, but the cost (approximately $70) , Durometer 

hardness (too soft), and non availability of the CM part number 638225 

center tubular bushing.



3) " If you can draw them up I can get a quote for making them but your best 

bet may be to use the factory ones if you can get them."



Yes, I intend to continue using the CM part number 530740 (or its Lord 

J3608-1 substitute) end bushing and keep searching for a better solution for 

the CM part number 638225 center tubular bushing.



OC



==========================================================



From: M Ketteing

Sent: Friday, September 11, 2015 7:30 PM

To: Owen Baker

Subject: Re: IO-240 BxB Engine Mount Bushings



Hello OC,



If the O-200 adapters do not work could something similar be made for the 

IO-240 BXB?  If you can draw them up I can get a quote for making them but 

your best bet may be to use the factory ones if you can get them.



The conical rubber bushings on ebay are actually $1.25 each.  But with 

shipping the total is $22.22 for 8.



Mark

Keith.Miller(at)esa.int
Guest

Posted: Mon Sep 14, 2015 1:52 am Post subject: 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



From:	"Owen Baker" <bakerocb(at)cox.net>

To:	"M Ketteing" <aeromomentum(at)yahoo.com>, "KIS-LIST MATRONICS"

            <kis-list(at)matronics.com>,

Date:	09/12/2015 05:12 PM

Subject:	IO-240 BxB Engine Mount Bushings

Sent by:	owner-kis-list-server(at)matronics.com






9/12/2015



Hello Mark, You wrote:



1) "The conical rubber bushings on ebay are actually $1.25 each.  But with

shipping the total is $22.22 for 8."



Right you are, and that is a good price for those who can use the 22387

bushing.



2) "If the O-200 adapters do not work could something similar be made for

the IO-240 BXB?"



Maybe, but the real issue is not the configuration, cost (approximately

$17.50), and availability of the CM part number 530740 (or its Lord J3608-1

substitute) end bushing, but the cost (approximately $70) , Durometer

hardness (too soft), and non availability of the CM part number 638225

center tubular bushing.



3) " If you can draw them up I can get a quote for making them but your best

bet may be to use the factory ones if you can get them."



Yes, I intend to continue using the CM part number 530740 (or its Lord

J3608-1 substitute) end bushing and keep searching for a better solution for

the CM part number 638225 center tubular bushing.



OC



==========================================================



From: M Ketteing

Sent: Friday, September 11, 2015 7:30 PM

To: Owen Baker

Subject: Re: IO-240 BxB Engine Mount Bushings



Hello OC,



If the O-200 adapters do not work could something similar be made for the

IO-240 BXB?  If you can draw them up I can get a quote for making them but

your best bet may be to use the factory ones if you can get them.



The conical rubber bushings on ebay are actually $1.25 each.  But with

shipping the total is $22.22 for 8.



Mark

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Mon Sep 14, 2015 7:04 pm Post subject: IO-240 BxB Engine Mount Bushings

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(at)esa.int

Sent: Monday, September 14, 2015 5:52 AM

To: kis-list(at)matronics.com

Subject: Re: 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

hans.erstad(at)gmail.com
Guest

Posted: Tue Sep 15, 2015 2:17 am Post subject: 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).Â  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(at)cox.net (bakerocb(at)cox.net)>:

[quote]--> KIS-List message posted by: "Owen Baker " <bakerocb(at)cox.net (bakerocb(at)cox.net)>

 

 9/14/2015

 

 Hello Keith, You wrote:

 

 1) "... i priced it up at the beginningÂ  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 madeÂ  i wouldÂ  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-C1Â  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 solutionÂ  Â i would be very happyÂ  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,Â  is just a piece of hose. See here:

 

 http://www.aircraftspruce.com/catalog/eppages/contmountparts.php?clickkey=26078

 

 OC

 

 ====================

 From: Keith.Miller(at)esa.int (Keith.Miller(at)esa.int)

 Sent: Monday, September 14, 2015 5:52 AM

 To: kis-list(at)matronics.com (kis-list(at)matronics.com)

 Subject: Re: IO-240 BxB Engine Mount Bushings

 

 --> KIS-List message posted by: Keith.Miller(at)esa.int (Keith.Miller(at)esa.int)

 

 OC,

 

 I need to replace mineÂ  soon ( 638225 & 530740 ) . Like youÂ  I am happy to

 payÂ  for the 530740, butÂ  the 638225 is a rip-offÂ  - i priced it up at the

 beginningÂ  of this year and found them for 49$ from aircraft specialties

 supplies .

 

 So if you come up with a solutionÂ  Â i would be very happyÂ  to hear itÂ  . Also

 if you can get some madeÂ  i wouldÂ  also be happy to share the costs.

 

 Keith

 

 

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 List" target="_blank" rel="noreferrer">http://www.matronics.com/Navigator?KIS-List

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 Â  Â  Â  Â  Â  -Matt Dralle, List Admin.

 target="_blank" rel="noreferrer">http://www.matronics.com/contribution

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Tue Sep 15, 2015 7:57 am Post subject: IO-240 BxB Engine Mount Bushings

From: Owen Baker

Sent: Tuesday, September 15, 2015 11:32 AM

To: KIS-LIST MATRONICS ; MILLER KEITH ; ERSTAD HANS CHRISTIAN ; WRIGHT JESSE 

; 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(at)esa.int

Sent: Tuesday, September 15, 2015 4:14 AM

To: Owen Baker

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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