Lord Isolators - What is the correct orientation?

[robcaldwell]

I (finally) received the correct Lord Isolators for my IO-540 with the Type 2 mounting ears (2" ID) for the Type 2 Dynafocal...

Does anyone know how these are to be oriented to the ears and mount? The gold colored piece is smaller in thickness (1 3/8") and the silver colored piece is 1/4" thicker (1 5/8"). I am assuming gold colored piece goes on the engine side along with the big washer as I have mocked up here? You would think they would send instructions. There's certainly a reason for the difference in sizes.

IMG_1894.JPGIMG_1895.JPG


EDIT 7-15-2019: Based on the conversation below, the orientation above is wrong. Please read the discussion in this thread as we sort out this under documented topic.

[Aero_tango]

Refer to this VAF thread.

http://www.vansairforce.com/community/showthread.php?t=91296&highlight=Lord+installation

[robcaldwell]

The discussion in this VAF thread is incorrect. Please read through the discussion below for the correct orientation.

[robcaldwell]

I contacted Lord and they sent me this diagram. Very helpful.

J-9613-12.png

[svyolo]

That shows that it does matter which mount goes inside or outside. The VAF thread there were two opinions, one of which said it didn't matter.

[robcaldwell]

Yes, I came to the same conclusion. It is very odd to me that these isolators are shipped with zero detail as to how they are to be oriented. Furthering that, the speculation in threads from VAF and others do not help. I have to say, the engine mounting process has been a complete fiasco for me. Between Lycoming's ineptness in understanding their own mounting ears, and the isolator manufacturers (both Lord and Barry) incomplete details has literally removed 6 weeks off my build time. This, I never expected.

[Bdflies]

Studying the diagram more, I saw something I'd missed previously.
Section A-A is the top mount, which places the 'ridged' isolator on the engine side.
Section B-B is the lower mount, which places the 'ridged' isolator on the mount side.
Seems they want the 'ridged' (gold) part to be in compression at 1G.
Can’t see from your pics, but I assume 7763-1 is molded onto the Gold one and 9612-8 is on the Silver part.

Scratch my bird comment below.

[Bdflies]

It’s been my impression that the one with the "ridge" on it, is oriented between the engine and the mount. I wasn’t aware that the bases were different colors. But there ya go!

I do like the diagram from Lord! If I had a bird, it would be useful!

Bill

[JimParker256]

Rob,
Thanks for posting that. It went into my build folder!

[robcaldwell]

Here is a discussion I posted reviewing my engine mounting dilemma.

[Nev]

Thanks Rob, always learning a lot from watching your videos.

[Bcone1381]

Rob, your video was very revealing. Thanks for sharing it.

When you are confident that all your hardware and parts are correct, can you document a parts list for our group? ...along with the torque value that your AN7 bolts get tightened to? I imagine that the compressible mounts would accommodate several different length bolts if they get torqued down to a "wrong" value. An industry best practice might include a sticky to document this information for different applications like the Patrol, LSA, and 4 cylinder Four Place. BTW, I think I got some non-Lord type engine mount isolators with my Kit from Mark G.

[robcaldwell]

Will do. I plan to torque the AN7's to the values in AC 43.13 for that size bolt.

[Battson]

Ridge side always goes in compression.
If you have it backwards, your isolators wont last as long before the engine sags.

[svyolo]

4 made for compression, 4 for tension. Makes sense. Almost makes me think $800 dollars for 8 pieces of rubber was worth it. Well, maybe not.

[Bdflies]

Rob, the isolator, in your pictures, with the gold plate has a small Protrusion, just about the middle of the height of the rubber donut, forming a 'ridge' around the circumference. The ridge is depicted in the drawing. This characteristic is what we’re referring to as the "ridged" isolator. It’s noticeable if you compare the rubber of the gold one vs the silver one.
The "ridged" isolator is the J-7763-1

[robcaldwell]

Ok great. That was my conclusion from the drawing and how I explained it in the video. Thought I was missing something, again. Thanks!

[Nev]

This video helps to understand the orientation https://m.youtube.com/watch?v=jcM2x_g7wf4

[robcaldwell]

Excellent verification!

[svyolo]

I just got back after a few weeks away and double checked my mounts. I have a Type I mount (O-540) so my mounts are different. Lord J-3804-20. I see no difference between the two halves. Same color, same thickness. One is not ridged, and both are the same color, gold. The rubber parts have the same part number molded into them.

Just for the fun of it I made sure the engine ears, Lord mounts, and engine mount all fit together.

[Gerhard Rieger]

Hi, are your engine mounting braket hole 2” or 1&3/8” ?

[svyolo]

I am not sure. It is all mounted up. I am assuming you are talking about the "ears" on the engine. I don't think I can measure it unless I am looking at the wrong part.