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lance38dt
 Post subject: Re: motor mount
PostPosted: Mon Mar 31, 2014 6:36 pm 
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Thanks Bernie it helps when someone has had done the same job I'll look froward to your contact.

Thanks LANCE


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dcuke
 Post subject: Re: motor mount
PostPosted: Mon Mar 31, 2014 6:48 pm 
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Joined: Sat Oct 30, 2010 7:59 pm
Posts: 94
Location: Visalia, California
I used the original type mounts for my O-290 (cost $19.50) . http://www.aircraftspruce.com/catalog/e ... shings.php

Dan honed 4 nice aluminum bushings for me which made using these mount bushings work perfectly.

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Dean Cuke
Visalia, California
N772DM
KVIS


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lance38dt
 Post subject: Re: motor mount
PostPosted: Mon Mar 31, 2014 7:11 pm 
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I saw those Dean how are they holding up for you and how long have they been on?

Thanks Lance


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dcuke
 Post subject: Re: motor mount
PostPosted: Mon Mar 31, 2014 7:54 pm 
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Location: Visalia, California
They are holding up just fine. They have been installed for 2 years with about 120 hours of fly time. NO signs of wear yet. Easy install, no sag, and a great price. I have no regrets installing them. Especially after pricing the lord mounts. lol

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Dean Cuke
Visalia, California
N772DM
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fytrplt
 Post subject: Re: motor mount
PostPosted: Tue Apr 01, 2014 5:48 am 
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Joined: Tue Oct 20, 2009 8:07 pm
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Location: Lakeland, Florida, USA
Remember, the isolators as shown in the pix, must have a steel bushing inside of them. This bushing bottoms out when the preload reaches the right dimension. Just snug is the right torque.

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Bob Highley
N711SH
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lance38dt
 Post subject: Re: motor mount
PostPosted: Tue Apr 01, 2014 6:49 am 
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Thanks bob will do


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James Grahn
 Post subject: Re: motor mount
PostPosted: Tue Apr 01, 2014 10:23 am 
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Joined: Sat Oct 24, 2009 7:16 pm
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I did one at a time on mine a few years ago. Start with the top as they are the hardest. The last one will give you fits, but it will go.
Cubes


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lance38dt
 Post subject: Re: motor mount
PostPosted: Tue Apr 01, 2014 10:53 am 
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Thanks for the tip cubes I was going to start with the bottom , knowledge is king

lance


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thorpdrvr
 Post subject: Re: motor mount
PostPosted: Wed Apr 02, 2014 12:33 pm 
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Joined: Wed Oct 21, 2009 12:35 pm
Posts: 81
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I checked and part # 08-03600 are the correct mounts. They are a dynafocal type mount, but on the 290 they are not used in a typical dynafocal fashion. The mount on the 290 is flat and not angled like a normal dynafocal engine. This is a good thing as far as changing mounts go, as it is easy to replace them. It shouldn't matter if you start on top or bottom as the mounts do not angle inward. Lift the engine slightly to take the weight off of the mounts, remove bolts and move the engine slightly forward (about 3/4" or so) and swap them out. Can also tip engine down and change top and tip up and change bottom. Tighten the bolt until the two halves of the mounts hit the bushing in the center (metal to metal).

Bernie Fried
N18XS


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lance38dt
 Post subject: Re: motor mount
PostPosted: Wed Apr 02, 2014 12:37 pm 
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Thanks for getting back to me Bernie and for the info appreciate it.

Thanks Lance


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lance38dt
 Post subject: Re: motor mount
PostPosted: Tue Apr 15, 2014 6:32 pm 
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Update, used a/c spruce 08-03500 which are J-7402-5 the 08-03600 that Bernie used were not available backordered , they were about half the price of the ones I used but were available thanks all who responded.
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jtwigg
 Post subject: Re: motor mount
PostPosted: Mon May 08, 2017 5:11 pm 
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Joined: Thu Sep 03, 2015 10:11 pm
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I have a 290 also, and am looking to replace the original Lord J-7401-3 mounts. From reading this thread and talking to Bernie at Kentucky Dam and Bill Williams a few minutes ago, is the cheaper aerobatic 08-03600 part a good replacement for the Lord J-7401-3 mount? It's half the price. This is what I know so far:
* The replacement mount for the discontinued Lord J-7401-3 is the Lord J-7402-5
* Aircraft Spruce has a part number 08-03500 that is the J-7402-5 for $449 for a set of 4 pair
that part number is here: http://www.aircraftspruce.com/catalog/e ... kkey=30619
* However, Aircraft Spruce has another part, 08-03600 that appears to be the same as the 08-03500 but beefed up for aerobatics - but at roughly HALF the price for $247 for a set of 4 pair. Aircraft Spruce says, " it is the same style as homebuilt type but inner core has been “beefed up” and elastomers added to encapsulate the spacer. 2" Diameter."
That beefed up part is here: http://www.aircraftspruce.com/catalog/e ... afocal.php
* I think I read that Bernie used this latter 08-03600 part when he replaced his mounts.

John Twigg
N12055

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John Twigg N12055 SN.79 Pittsburgh, PA (KFWQ)


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Jim Mantyla
 Post subject: Re: motor mount
PostPosted: Wed May 10, 2017 3:24 pm 
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Joined: Wed Oct 21, 2009 6:57 pm
Posts: 169
Location: Barrie, Ontario,Canada
Guys,

I used the 08-03600 mounts about 4 years ago and there does not seem to be any drooping since. I have an IO-320 with C/S prop and I thought the stiffer ones would be better to support the extra prop weight.

regards,

Jim


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jtwigg
 Post subject: Re: motor mount
PostPosted: Fri May 12, 2017 9:30 am 
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Joined: Thu Sep 03, 2015 10:11 pm
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This forum and its members are really helpful. Glad to hear that Jim likes his. I went ahead and bought the 08-03600's after chatting with Bernie about his and getting assurances from Aircraft Spruce that I could return them if they didn't fit for me. Anyway, they look great and match dimensionally. And, they are beefier and $200 cheaper to boot. The 4130 steel tube supplied with each pair appears that it may be a bit short, so maybe I'll use the existing tubes. I'll know when I see the old tubes and compare lengths.

My engine doesn't have a lift ring, so some buddies and I are going to make up a six for our chapter. We took one guy's lift ring and measured it. It is 5.75" long (when straightened out) and 0.1875" thick and 0.625" wide. We didn't want to get into cutting bar stock or sheet, so I found a site, http://www.metalsonline.com, that has an incredible amount of sizes and will cut the metal to your specifications. The total came to $20.87 for everything to make our six rings. Metal = $9.92. Cut Fee = $6.00. Shipping = $6.95. Taxes = $0.00.
I expect that we'll have to heat-treat after bending this bar stock. Several of us are meeting at the Chapter this coming Monday night to make them up.


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John Twigg N12055 SN.79 Pittsburgh, PA (KFWQ)


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jrevens
 Post subject: Re: motor mount
PostPosted: Fri May 12, 2017 7:17 pm 
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Joined: Thu Oct 22, 2009 10:13 pm
Posts: 658
Location: USA
If your material is the same thickness as a standard Lycoming lift ring, mild steel should be plenty strong, John... you shouldn't have to heat-treat anything. Hell, the case-half bolts are basically hardware store grade-3 bolts on a Lyc anyway, and the engine probably weighs less than 300 lbs. That's just my opinion - others may want to chime in with a different view.

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John Evens
Arvada, Colorado

T-18 N71JE
Kitfox 7 SS N27JE (building)


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