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Old 09-20-2017, 05:09 PM   #1
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Raw Water Strainer Elbow

I need to replace the elbow on the main engine raw water strainer. Perko has them with pipe end measuring 1 1/4 or 1 1/2 inches and hose end measuring the same. My issue is the calipher is measuring the existing elbow at 1 3/8 for the pipe and 1 1/8 for the hose. Do I go with the 1 1/4 and hope it works?
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Old 09-20-2017, 07:28 PM   #2
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that would be a big fat no.
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Old 09-20-2017, 07:32 PM   #3
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I certainly wouldn't install if it wasn't water-tight. I can't seem to find an elbow with the measurements I have.
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Old 09-20-2017, 07:35 PM   #4
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I certainly wouldn't install if it wasn't water-tight. I can't seem to find an elbow with the measurements I have.
Someone made the one you have so keep looking.

Is it an engine part? If so, check with the manufacturer or a parts distributer.
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Old 09-20-2017, 07:43 PM   #5
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Was there a standard for an '86 Grand Banks Classic 36? Looks like it could be original.
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Old 09-20-2017, 07:58 PM   #6
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what engine? Lehmans?

scratch that, what strainer? groco 1000? or 1500? groco sells elbows too by the way.
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Old 09-20-2017, 07:59 PM   #7
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Yes, 135
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Old 09-20-2017, 08:03 PM   #8
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Have look in here.

https://www.groco.net/products/fitti...-hose-fittings
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Old 09-20-2017, 08:04 PM   #9
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umm elbows...

https://www.groco.net/products/fitti...to-hose-elbows
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Old 09-20-2017, 08:34 PM   #10
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Thanks, still don't see the size. This is a photo, overlook the wires, will fix that while I'm down there.Click image for larger version

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Old 09-20-2017, 11:57 PM   #11
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The elbow in the photo looks like it's been bastardized to make do.
Looks like a too small elbow patched in there with a reducing bushing, or something along those lines.
All the hoses/fittings in the run should be of the same size.
I would turn off the seacock and remove the strainer and its plumbing for a good cleanup and inspection.
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Old 09-21-2017, 06:35 AM   #12
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It does look like a reducing bushinbg is used. Measure the thread size of it, and see what that gives you.
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Old 09-21-2017, 07:01 AM   #13
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Threads are 1 3/8 inches.
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Old 09-21-2017, 07:19 AM   #14
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Threads are 1 3/8 inches.
Odd size, don't see that anywhere.

I would salvage this thing by silver brazing using an acetylene torch a modified ground to fit bronze reducer or pipe coupler into perhaps a ground to fit hole in the housing. Or but weld it onto the existing 1 3/8 coupler. Or weld in a threaded bronze nipple.
That gives you a standardized new thread to attach a standard elbow.

A Harris 15% silver rod works great on bronze. I know how to weld, if you can find someone, silver brazing with an acetylene torch is easy. Needs to be a good fit or it will flow out of the join.
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Old 09-21-2017, 08:08 AM   #15
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Thanks guys, I appreciate the info. I was trying to minimize down time but it looks like I need to pull the strainer and do things properly, replacing whatever needs to be replaced. Elbow has a drip and I'm sure it's only going to get worse if not addressed. Thanks again.
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Old 09-21-2017, 08:28 AM   #16
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Remove the failed elbow and take it to a plumbing supply store (not a home center). Walk up to the counter and show it to the man (or woman). Tell them you need a replacement in bronze. If there's a reducer or adapter, remove that as well.

Use pipe dope, not Teflon tape when reassembling.
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Old 09-21-2017, 09:06 AM   #17
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Threads are 1 3/8 inches.
At last being an old Eng has an advantage, there's nothing been changed or "Bastardized" there at all , many years ago this was the norm found on older sea strainers,

What you have is a large NUT holding the elbow in place some had seals other relied on metal to metal curvature ball face to seal, coming out of the strainer is a MALE straight NST thread and yes 1 3/8 is A COMMON SIZE for NST Straight (Called NST) National Straight Thread),HAS 8 THREADS PER INCH, These came out in the same size 1 3/8 for 3/4 pipe and 1 " pipe (hose barb), they are designed with the nut so they can be adjusted to point different ways then locked up!

Hard to find the these days as have been replaced by NTS National Taper Thread , normally can be repaired by silver solder brazing if holed etc, cant find my pics as yet but below will give you the general idea of how it works/looks, this is plumbing fitting but you should get the idea!!!

Cheers Steve
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Old 09-21-2017, 09:33 AM   #18
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At last being an old Eng has an advantage, there's nothing been changed or "Bastardized" there at all , many years ago this was the norm found on older sea strainers,

What you have is a large NUT holding the elbow in place some had seals other relied on metal to metal curvature ball face to seal, coming out of the strainer is a MALE straight NST thread and yes 1 3/8 is A COMMON SIZE for NST Straight (Called NST) National Straight Thread),HAS 8 THREADS PER INCH, These came out in the same size 1 3/8 for 3/4 pipe and 1 " pipe (hose barb), they are designed with the nut so they can be adjusted to point different ways then locked up!

Hard to find the these days as have been replaced by NTS National Taper Thread , normally can be repaired by silver solder brazing if holed etc, cant find my pics as yet but below will give you the general idea of how it works/looks, this is plumbing fitting but you should get the idea!!!

Cheers Steve
That looks to be a copper elbow (in Steve's photo) and that's a no-no for salt water or a boat that might ever be run in salt water. Also, the end is not a hose barb, it's for soldering to copper pipe. You can't count on a hose staying on that fitting.

It doesn't really matter what is on there now, what is needed is a way to connect the hose to the strainer. As I posted above the plumbing supply store will likely have it. West Marine might have it and at West Marine you can buy two or three different sizes and return the ones you don't need if necessary. Again, bronze, not copper.
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Old 09-21-2017, 09:39 AM   #19
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That looks to be a copper elbow (in Steve's photo) and that's a no-no for salt water or a boat that might ever be run in salt water. Also, the end is not a hose barb, it's for soldering to copper pipe. You can't count on a hose staying on that fitting.

It doesn't really matter what is on there now, what is needed is a way to connect the hose to the strainer. As I posted above the plumbing supply store will likely have it. West Marine might have it and at West Marine you can buy two or three different sizes and return the ones you don't need if necessary. Again, bronze, not copper.
WHAT I SAID WAS: this is not the fitting this is a photo to give you a general idea of the set up ONLY! I also stated it was plumbing fitting
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Old 09-21-2017, 10:28 AM   #20
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Well you could always spend a buck and update your equipment to modern day stuff.

Just sayin.
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