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Post by snark3 on May 11, 2019 23:54:24 GMT -8
A recent thread here made me decide my next repair/overhaul attempt would be definitely one, possibly both of my Northill regs. I opened up 5P1860, unfortunately I found the exhaust valve to be toast. I opened up 7-4141 hoping to find a good exhaust valve.....nope this one is toast too. Anybody have or know somebody who has parts for Northills?
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Post by nikeajax on May 12, 2019 8:02:35 GMT -8
Skip, can you post an image? I wonder if you can cut something down or fabricate something. I have the OPV from an old ScubaPro wing BC: it's freaking huge, but yer welcome to it if it'll help...
JB
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Post by vance on May 12, 2019 12:18:00 GMT -8
I've never seen an actual Northill regulator, so I don't really know what they have in them. Parts might be subbed in from different regs, but you'd have to do some measuring and comparing. I'm guessing they have a Dacor type diaphragm with the exhaust mushroom integrated?
Rob at thescubamuseum.com has a partial Northill for $75 if you need hard parts.
I know I've seen some pics of a disassembled Northill, but can't find any now. How about showing us some breakdown pictures, Skip?
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Post by snark3 on May 12, 2019 12:18:40 GMT -8
Thanks JB. I cant post a pic tonight but I will post one in the morning
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Post by snark3 on May 12, 2019 12:20:32 GMT -8
Phil- I'll post the parts breakdown also in the morning
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Post by nikeajax on May 12, 2019 13:03:55 GMT -8
Phil, you beat me to the Dacor idea! I was wondering if you could sub a Dacor-exhaust, so please measure and send images, we may be able to figure this out JB
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Post by snark3 on May 13, 2019 13:33:56 GMT -8
Here are a couple of images of the Northill parts diagram.
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Post by snark3 on May 13, 2019 13:47:26 GMT -8
Here are the parts from my reg. What you're looking at is actually 3 pieces, numbers 3, 4, and 5 in the parts diagram. #3 which looks like a diaphragm is actually the exhaust valve, #4 is a plastic spacer or retainer, and #5 which liiks like a gasket is the diaphragm.
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Post by vance on May 13, 2019 14:36:24 GMT -8
Is your diaphragm any good? There's a plate covering the center like most diaphragms?
We're not seeing the exhaust valve in your picture, correct? It would cover the circle of slots completely?
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Post by nikeajax on May 13, 2019 15:14:56 GMT -8
GRRRRR! There's something wrong with Skip's image: I tried to repost it, but it won't show: I wonder if it's something with Yahho's coding?
JB
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Post by SeaRat on May 13, 2019 15:41:33 GMT -8
Skip,
Other than the sand and dirt, the rubber looks to be in pretty good shape. I think a good dose of silicone grease will bring it back to life after cleaning it up a bit. Be careful while cleaning it not to bend it too much, then silicone it really well, and let it sit for a week to absorb the silicone grease. After that, try separating the diaphragm parts and re-silicone it, letting it sit another week. You may find that after doing this, it is usable.
I don't think anything Dacor produced will fit on this particular regulator though.
John
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Post by SeaRat on May 13, 2019 15:42:23 GMT -8
GRRRRR! There's something wrong with Skip's image: I tried to repost it, but it won't show: I wonder if it's something with Yahho's coding? JB I'm seeing those images just fine; maybe what you did worked, or what Skip did is already working. John
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Post by nikeajax on May 13, 2019 16:13:11 GMT -8
There was something really hinky going on with that image, but yes, it does show now How the devil does the exhaust diaphragm attach, is it floating er sumthin'? JB
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Post by snark3 on May 13, 2019 21:28:20 GMT -8
Phil- The diaphragm is possibly reuseable, or I might be able to make one. The exhaust valve is shown in the bottom pic I posted, 0159. Unfortunately the exhaust valve is toast, I was thinking I might be able to cut down a USD single stage diaphragm to make a new exhaust valve. JB I think you could be right about it being a floating exhaust valve. The cover has 4 protrusions on it which I believe is what holds it in place. Get this guys if I'm looking at it correctly and understanding what I've read elsewhere, the levers are actuated off the EXHAUST hose not the intake hose like a DAAM, Snark, or Hydro twin
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Post by snark3 on May 14, 2019 13:17:05 GMT -8
I went out today to have a cigar and did a little poking around on the Northill. The diaphragm, I think may be salvageable using silicone grease as John suggested. The exhaust valve had holes in it and was hard as a rock. I did some picking and removed the exhaust valve from the carrier. The carrier has a groove in it that the exhaust valve fits into, which answers JB's question as to what holds it in. I'm thinking I might be able to make one out of the sheet silicone, or the sheet rubber I bought to make parts for my Hydro-Twin. It looks like I might not have to buy a Delorean and built a Flux capacitor after all. Here is a pic of the carrier with the diaphragm still on it, and the exhaust valve removed.
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