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Old 03-15-2010, 11:20 AM   #1 (permalink)
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Quick fix for O-ring intakes

I know there's a lot of you out there that don't have intake leaks (right) but for those who do...
I have an '80 Shovel with o-ring heads and I've always had trouble with intake leaks. I've tried o-rings, bands, bands with o-rings, tight, loose, nothing seemed to work. If I kept the clamps tight enough to stay put, they'd distort the bands. If I kept them snug, but loose, they'd walk in on the manifold until they were almost touching. Then I came up with this and if it helps just one other guy out there, it'll be worth the effort.
Get a new set of o-rings, plus a set of later style bands and clamps and a piece of smooth aluminum siding (or equivalent).
Cut two rings out of the aluminum siding. They should just slip over the ends of the manifold and have to be large enough to keep the band clamps from moving in on top of them. Mine ended up with a 2" inner diameter and a 2.25 outer diameter. Give them a couple of coats of hi-temp paint and let them sit until dry. Then slip them over the ends of the intake manifold, put the bands on and push the o-rings into the bands. Set the clamps in place and wiggle the whole setup into place on the heads. Use your finger to make sure that you're not pinching the o-rings and that the manifold is seated properly and tighten the clamps. It goes without saying that you should make sure that your carb and air cleaner are properly supported.
Since I did this, my band clamps have not been able to move in, plus, the o-rings are doing the job of sealing the intake and the bands are keeping the vibrations isolated from the carb.
I hope this helps somebody.
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Old 03-15-2010, 10:14 PM   #2 (permalink)
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Sounds like a good idea.

Got any pics?

I used to have to carry a bunch of bands around with me on my 81FLH.

I'm buying a 80 FLH later this month and I'll be filing this fix away for future reference just in case.
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Old 03-16-2010, 09:15 AM   #3 (permalink)
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Could have taken pics while I was doing it, but the idea was to get back on the road, not to document what I was doing. It's all buttoned up now, so taking a pic of it wouldn't show you anything.
You've likely got band style heads on your '80-'81, I've got earlier heads on my '80, so the o-ring trick might not work for you. You'd need o-ring style heads and intake manifold to do what I did, but if your problem is that the band clamps are vibrating in towards each other. the aluminum shims will fix it. You'll be able to keep the clamps snug without distorting the bands and the shims keep them in place. I intended to make another set out of brass, but the aluminum ones are still holding up.
Just remember that you are basically making a big washer. The I.D. should slip onto the intake manifold and the O.D. should be bigger than the diameter of the band clamp. All it does is keep the clamp from moving. If you set your intake manifold on the bench in front of you with the carb side down, you just put the shims on first then put your bands on (and in my case, I would install the o-rings next), then put your clamps on the bands. You'll see what it does then. You can't push the clamps down past the bands and onto the manifold. The shims hold them back.
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Old 03-23-2010, 07:49 PM   #4 (permalink)
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Thanks,
Hopefully the New shovel soesn't have the problems the old shovel did but I may do it just for the "It can't hurt, It might even help factor"

Thanks
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Old 03-28-2010, 07:35 PM   #5 (permalink)
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Ran a shovel head for MANY years as well as work on hundreds of them and never had any real problem with the o-rings leaking. Yes I have seen some go to leaking and had to replace them. I had more trouble with the late style bands leaking then the O-ring as you are clamping on the rubber bands and not metal flanges like with the O-rings. Hear is me on my new 1976 bicentennial right after I bought it.

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Old 03-28-2010, 07:41 PM   #6 (permalink)
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Back in my shovel head days the trick I used with O-rings was to use the Aircraft style intake clamps with new o-rings every time I did anything related to the manifold. The other trick I used was a wrap of electrical tape around the o-ring, under the clamp. The only carb I ever had to run any extra support under was an SU but then that thing weighed a ton anyway.
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Old 03-26-2012, 08:42 PM   #7 (permalink)
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Anyone have a trick for band type seals? I dont know if I'm tightening them to much or what they are not staying sealed for long!
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Old 03-27-2012, 06:19 PM   #8 (permalink)
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Quote:
Originally Posted by ilbkshovel View Post
Anyone have a trick for band type seals? I dont know if I'm tightening them to much or what they are not staying sealed for long!
its easy to tighten too much...don't dew it...you'll be happier.

Tightening too much pinches the bands and creates a leak eventually.
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Old 03-28-2012, 05:40 PM   #9 (permalink)
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But how tight is enough? just snug em up? I know I've been cranking em really tight and that isnt working.
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Old 03-28-2012, 05:55 PM   #10 (permalink)
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But how tight is enough? just snug em up? I know I've been cranking em really tight and that isnt working.
well...since I can't find a torq value for it in my manwell I would suggest somewhere short of "cranking em really tight"
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Old 04-17-2012, 11:02 AM   #11 (permalink)
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Another trick

A little trick I've used forever is "wrapping" the manifold and o-ring with teflon tape before the clamp goes on. They never leak if the heads are aligned properly when they were put on.

Push the o-ring up on the head section of the flange on each head. Line up the manifold and use one of the clamps to just hold it in place while you wrap the other. Two people makes this step unnecessary btw. Slide the o-ring down into the groove between the flange and manifold and put about 5 good wraps around the two covering the o-ring and both flanges. Install the clamp and do the other side. I've run my "B" like this forever and never have had a leak. Ran it over three years with no support bracket at all due to a stripped hole for the bracket..

Griz
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Old 04-17-2012, 01:54 PM   #12 (permalink)
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I left this thread alone but jeeeze,, just can't anymore..

If they are installed correctly they never leak even when torn-up..
I've pulled manifold for other reasons and found slightly ripped o-rings that were Not leaking..

I last put on my O-Rings in 2006 on my 93" shovel,, no leaks no probs and all these wraps and crap will either do No good or cause an in-correct fit and cause a leak by themselves..


Don't bother arguing with me fellas,,,, just keep doing it your way and the Millions of us that can do it correctly will simply keep doing it ah,,,, you know,,, correctly..
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Old 04-17-2012, 02:45 PM   #13 (permalink)
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Quote:
Originally Posted by frisco-rigid View Post
I left this thread alone but jeeeze,, just can't anymore..

If they are installed correctly they never leak even when torn-up..
I've pulled manifold for other reasons and found slightly ripped o-rings that were Not leaking..

I last put on my O-Rings in 2006 on my 93" shovel,, no leaks no probs and all these wraps and crap will either do No good or cause an in-correct fit and cause a leak by themselves..


Don't bother arguing with me fellas,,,, just keep doing it your way and the Millions of us that can do it correctly will simply keep doing it ah,,,, you know,,, correctly..
couldn't agree more....here's my standard response...."Your doing it wrong"
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Old 04-19-2012, 09:16 AM   #14 (permalink)
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Quote:
Originally Posted by frisco-rigid View Post
I left this thread alone but jeeeze,, just can't anymore..

If they are installed correctly they never leak even when torn-up..
I've pulled manifold for other reasons and found slightly ripped o-rings that were Not leaking..

I last put on my O-Rings in 2006 on my 93" shovel,, no leaks no probs and all these wraps and crap will either do No good or cause an in-correct fit and cause a leak by themselves..


Don't bother arguing with me fellas,,,, just keep doing it your way and the Millions of us that can do it correctly will simply keep doing it ah,,,, you know,,, correctly..
AMEN! Nuff said.....
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Old 04-23-2012, 08:15 PM   #15 (permalink)
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Quote:
Originally Posted by ilbkshovel View Post
Anyone have a trick for band type seals? I dont know if I'm tightening them to much or what they are not staying sealed for long!
the stock air cleaner fastened to the rocker covers and held the carb/manifold in place.
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