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lord mounts
#362367 03/11/11 2:11 am
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jaycee Offline OP
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does any one have a sure fire solution to prevent oil tank mts and exhaust lord mounts from breaking?

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Re: lord mounts
jaycee #362370 03/11/11 2:28 am
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Are you talking about the rubber bonded threaded double ended thingies ? (lord mounts - where does that come from ?).

Good question.
I had a pair break on the shelf, before I'd even got to use them.
And one break on the oil tank, before it had even been started.

To my way of thinking, that makes them utter rubbish, even as a new item....

I had wondered if someone like Honda or Harley make something similar....

Re: lord mounts
jaycee #362374 03/11/11 2:58 am
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jaycee Offline OP
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its an aircraft term as these mounts were initially designed to mount aircraft electronics.i guess the designers name was lord.ive had the same experience as you from new,after 38 years i would like to solve it

Re: lord mounts
jaycee #362408 03/11/11 12:23 pm
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The oiling system is often "improved" by putting stainless braided lines which are INCREDIBLY stiff. This causes the oil tank to be shaken by the engine mounted on the isolastics which holds the other end of the feed line.
Even the original herring bone line is very stiff.

Since many people know me to be a contrarialn scientific sort of guy, I use a soft line between the engine and tank, along with a generous bow/loop to add even more flex capibility to the setup. This allows the line to flex more easily and reduce the movement energy transmitted to the tank/rubber mounts.
Less breakage, more reliability is MY goal...bling bling is not...

Remember there is almost NO pressure in these lines (feed or return) so the need for stiff high pressure line is purely an emotional thing not an engineering consideration. 2c


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: lord mounts
jaycee #362410 03/11/11 1:03 pm
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For the mufflers I find the "waisted" variety seem to last longer. The key is to have a good fit where there is little or no static stress on the mount. Easier said than done with the quality of exhaust pipes on the market today.

As to the oil tank. I have used Harley shovelhead oil tank mounts (lords smile ) and have never had one separate. The studs need to shortened slightly. Again proper alignment is important to keep the metal tab from breaking from fatigue. I have never had much success with the little Norton tank mounts.

Ron


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
Re: lord mounts
jaycee #362480 03/11/11 8:18 pm
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If the rear rubber mount doesn't break first then the rear tab can eventually break even with stock oil lines. This is a common problem. Well, it happened early on in my bike's life.

2 years ago I sent off my oil tank to Colorado Norton Works and had them do their thing to it. They remove the lower mount completely and weld a flat plate on it. The tank sits on a piece of thick foam. (If you have ever had to fiddle with the bottom bolt you will be glad to see it go.) They also supply larger mounts for the front and rear tabs. This is all described on the CNW site. I was happy with the job they did and it is one of the few things they do that is relatively inexpensive.


Re: lord mounts
jaycee #362481 03/11/11 8:32 pm
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Forgot to add ---- The company that made these anti-vibration mounts for the military electronics world was Lord Corp.

Re: lord mounts
jaycee #362559 03/12/11 4:56 am
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so ron, what is your source of supply for the wasted item?

Re: lord mounts
jaycee #362932 03/14/11 11:56 am
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Originally Posted by jaycee
so ron, what is your source of supply for the wasted item?


Mike Partridge (Walridge Motors)

Ron


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
Re: lord mounts
jaycee #363338 03/16/11 1:33 pm
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I got fed up with those mounts years ago...especially on the exhaust hangers. Some aftermarket mounts would pull apart after one ride, got tired of driving home with the exhaust system hanging off the the head.
I took a broken mount and removed the studs from both sides. Drilled a 3/8 hole through the rubber and used it with a 5/16 through bolt for the bottom mount only. I opened the holes in the mount to give the bolt a little wiggle room. You can adjust the movement by how tight you squeeze the rubber between the mounts. Have not had a problem since. BULLCRAP you say.....Try it with a 1/4 through bolt before you butcher your mounts drilling them over size...the smaller bolt will give you the wiggle room you need. Its flexible and it works.

Last edited by Alan Prudhomme; 03/16/11 11:15 pm.
Re: lord mounts
jaycee #363624 03/18/11 4:31 am
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excellent alan!just what i was looking for.

Re: lord mounts
jaycee #363996 03/20/11 3:16 am
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jaycee Offline OP
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mr.comeau, i believe you to be correct on the the oil tank lines.you are correct in that original lines are too stiff and the pressure is negligable.what do you recommend?i fed this thing oil tank mounts for donkey's years.

Re: lord mounts
jaycee #364002 03/20/11 3:55 am
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just a thought,as im breaking my norton to bits for foreign shipment,and have'nt studied it ,i will tommorow,that in the event that its possible,maybe a HARD set of mounted lines could be frame mounted and isolate the tank from "good vibrations"

Re: lord mounts
jaycee #364004 03/20/11 4:00 am
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thanks ron!

Re: lord mounts
jaycee #364042 03/20/11 12:43 pm
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jaycee
Not the stiff and expensive High Pressure fuel injection line like for my FI ducati.
I use car parts store regular fuel line...stands up to petroleum and is flexible with a generous arc over the transmission on the outer feed line and a generous return line also.


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: lord mounts
jaycee #364467 03/23/11 6:14 am
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thanks dave,

Re: lord mounts
jaycee #364891 03/26/11 1:16 am
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I replaced my muffler ones 7 yrs ago with ones from Granger's. they carry a wide variety and also give the shear strength. I think I used ones with 1/4 by 20 thread and they are still going strong.

Re: lord mounts
jaycee #364919 03/26/11 4:21 am
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do you recall graingers part number?there are differences in shore durometer

Re: lord mounts
jaycee #365005 03/26/11 7:08 pm
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I still have the empty bag. They were 5XK72. You have to search the part number as the current chart of the various dimensions and sizes has different numbers and probably a different supplier. It says limited to stock on hand. I think I better get a few more in stock myself. However, I have found storing rubber stuff does not alway pay. I put some fork gaiters on my Triumph that I had in stock for a number of years and they split right away. Go to page 1972 of the Grainger catalog for a full chart of available isolation mounts.

Last edited by aceaceca; 03/26/11 7:19 pm.

Moderated by  Dave Comeau 

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