---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Tue 09/15/15: 3 ---------------------------------------------------------- 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 _____________________________________ Time: 03:17:47 AM PST US Subject: Re: KIS-List: IO-240 BxB Engine Mount Bushings From: Hans Christian Erstad 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 : > > 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 _____________________________________ Time: 04:54:47 AM PST US From: "Owen Baker " Subject: KIS-List: Re: bushings 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 _____________________________________ Time: 08:57:51 AM PST US From: "Owen Baker " Subject: KIS-List: 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 ? 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