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Old 26-06-2007, 11:11 PM   #1
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Doh!

OK, so I measured the thread on my existing trim hoses.
7/16" x 24 TPI I thought. Simple - 7/16 UNF.
Nope, 7/16 UNF is 20TPI.

So, anyone know what the thread is on trim pump hoses?
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Old 26-06-2007, 11:24 PM   #2
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how long do these hoses need to be?
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Old 26-06-2007, 11:26 PM   #3
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Between 6' & 8'
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Old 26-06-2007, 11:30 PM   #4
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oh, I have 4 new 30" hoses with these new K-Planes, with 4 extra 30" ones and back to back adaptors to extend them to 60" (all new). You are welcome to use them temporarily to get you on the water. used back to back, you end up with 90degree ends, at both ends.
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Old 26-06-2007, 11:36 PM   #5
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Thanks for the offer - but shouldn't think I'll be on the water any time soon!
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Old 26-06-2007, 11:37 PM   #6
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So what thread do you reckon the fkkr's are?
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Old 26-06-2007, 11:40 PM   #7
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bout 7/16".

look like very standard mercruiser trim pump hoses with the stailness braid, covered with a transparent sheath.

I had the ones on my 28 made up.
though i did use merc fittings, removed and fitted into the new hoses, so I could mount my pumps way forward on the bulkhead.

I 'think' I still have a couple of the fittings, and am sure it would be possible to find some more old merc trim pump hoses to donate some more ends.

Then I could find out who did the supplying of hose/re-crimping for me.
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Old 27-06-2007, 12:06 AM   #8
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Just had hunt round in the garage on various old hoses and trim pumps and have found combinations of 3/8" x 24 TPI and 7/16" x 24 TPI and adaptors between the 2. I'm pretty sure that all the external bravo ram hoses are 3/8 UNF.

Looks I'll have to leave this one on the back burner pending actually measuring the ram union.
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Old 27-06-2007, 07:23 AM   #9
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Quote:
Originally Posted by Matt View Post
I'm pretty sure that all the external bravo ram hoses are 3/8 UNF.
These hoses are the internal ones.

I'll compare the two fittings I have, with the ones on the Kiekhaefer tab hoses I have.
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Old 27-06-2007, 07:25 AM   #10
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Cor, your up early.
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Old 27-06-2007, 07:26 AM   #11
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Early bird catches the worm!

And anyway, I'm often up before you go to bed!!

Us old fellas are like that you know, ask Ian Stirling!
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Old 27-06-2007, 08:32 AM   #12
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AN -4 is 7/16\" 20TPI
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Old 27-06-2007, 08:43 AM   #13
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I tried to find this out donkeys ago! No luck. They only people who knew whats fittings to use wouldnt tell me what they were for fear of me having them made locally and not by themselves.
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Old 27-06-2007, 08:49 AM   #14
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UNS thread form is 7/16 X 24TPI...Says so in my 1964 Machinist's Handbook...
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Old 27-06-2007, 11:47 AM   #15
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Matt Have a look in end see if there is a cone mating surface should be 37 1/2 degrees if it\'s an AN 45 deg it\'s a SAE
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Old 27-06-2007, 11:50 AM   #16
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I think I'm just gonna order the right part no.
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Old 27-06-2007, 12:05 PM   #17
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Mercury do a 72" steel braided trim hose... part # 32-67032A72 which they describe as having 3/8-24 UNF inverted flare/double flare both ends!
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Old 27-06-2007, 12:11 PM   #18
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Quote:
Originally Posted by BluFin View Post
Matt Have a look in end see if there is a cone mating surface should be 37 1/2 degrees if it\'s an AN 45 deg it\'s a SAE
7/16 SAE is 20 TPI.....
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Old 27-06-2007, 12:16 PM   #19
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Mmm. Listed in my pricebook , but not in the parts book.

Tony, please can you order a pair of 32-846051?
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Old 27-06-2007, 12:20 PM   #20
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Which is edzacharry where my source of confusion started - counting threads.

Quote:
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7/16 SAE is 20 TPI.....
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