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  #1  
Old 10-21-2019, 08:59 AM
Pilotjim77 Pilotjim77 is offline
 
Join Date: Jun 2018
Location: CHESHIRE, MA
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Default Loose Intake Hose Clamps

I pulled the cowling yesterday while chasing some wires, and I found that three of the eight clamps on the intake hoses were pretty loose. Each intake hose has two different kinds of clamps; the inner clamps closest to the sump have wing type screws that you can turn with your fingers. The outer clamps have hex/slotted screws. Only the inner clamps with the wing screws have become loose.

I am thinking I should replace the wing screw clamps with hex type clamps. Seems like I could tighten them down quite a bit more. Maybe that's why they are coming loose? Any thoughts?

Thanks in advance!

Jim
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  #2  
Old 10-21-2019, 09:32 AM
Discus2b Discus2b is offline
 
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?Wing? style hose clamps take a slotted tool driver bit to tighten beyond finger tight. They will stay tight. With good access, pliers work. Not a normally used clamp. My ?56 182 has some.

R
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  #3  
Old 10-21-2019, 10:14 AM
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koupster koupster is offline
 
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I made a tool to tighten these clamps some tears ago out of a piece of steel tubing. The tubing was heated, one end nearly flattened to fit the clamp, and the other was squared to fit a 3/8" extension.

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  #4  
Old 10-21-2019, 10:24 AM
WingsOnWheels WingsOnWheels is offline
 
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I replaced all of my clamps with the smooth T-Bolt clamps. I hope they do a better job than the old wing clamps.
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  #5  
Old 10-21-2019, 11:11 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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The problem is that the hoses are always shrinking.... so what ever traditional clamp you installed will keep getting loose because of the hose shrinkage. It is not because the clamps are loosening.
Constant tension spring clamps are the way to go.

If you upgrade to the SDS intake kit


You get spring clamps with it.
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  #6  
Old 10-21-2019, 11:16 AM
Bicyclops Bicyclops is offline
 
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Over torquing is to be avoided as it causes "cold flow" of the hose, a permanent deformation of the hose. It also damages the clamp. The table of limits in the Lycoming overhaul manual specifies the torque for worm drive clamps.

Ed Holyoke
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  #7  
Old 10-21-2019, 01:36 PM
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D Weisgerber D Weisgerber is offline
 
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I I update to an SDS kit does it come with 8 clamps?
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  #8  
Old 10-21-2019, 02:14 PM
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Toobuilder Toobuilder is offline
 
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Quote:
Originally Posted by D Weisgerber View Post
I I update to an SDS kit does it come with 8 clamps?
Yes. Everything you need. Install and forget.
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  #9  
Old 10-22-2019, 06:43 AM
Red Mtn flyer Red Mtn flyer is offline
 
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AND you get the benefit of actual seals at the intake, replacing those ^&*(% paper failures... which is what the kit is about.
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  #10  
Old 10-22-2019, 08:14 AM
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Low Pass Low Pass is offline
 
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Quote:
Originally Posted by Pilotjim77 View Post
I pulled the cowling yesterday while chasing some wires, and I found that three of the eight clamps on the intake hoses were pretty loose. Each intake hose has two different kinds of clamps; the inner clamps closest to the sump have wing type screws that you can turn with your fingers. The outer clamps have hex/slotted screws. Only the inner clamps with the wing screws have become loose.

I am thinking I should replace the wing screw clamps with hex type clamps. Seems like I could tighten them down quite a bit more. Maybe that's why they are coming loose? Any thoughts?

Thanks in advance!

Jim
Not sure what you're actually using, but a general purpose stainless steel worm-drive hose clamp does fine. They will likely loosen a little over time. Just check them every 100 hours or so. 1/4 or 1/2 turn of the screw to snug them up. Or, spend a chunk of money and not worry about checking.
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Last edited by Low Pass : 10-22-2019 at 08:28 AM.
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