HPOP discharge fitting question
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Semper Fi
Joined: Feb 2011
Posts: 771
Likes: 1
HPOP discharge fitting question
about to fix my leaking HPOP and step up to an Adrenaline. Looking at replacing the discharge fittings when I do and have a quick question. Dieselsite instructions say the oring seals it and to only run it down to where the fitting body touches the pump. Diesel orings instructions say the 680 locktite does the sealing and to torque to 25 ft/lbs.
Which is it?
Which is it?
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
There is an O ring on that fitting and O rings are seals. I heard that loc tite seal story too and my local shop tells me that loc tite does not seal and that sounds logical to me. As Sous says, only torque to 25 ft lbs and with a light torque like that loc tite will be needed to keep it in place.
Lead Driver
Joined: Mar 2004
Posts: 5,372
Likes: 108
From: Northern Indiana
I just did this yesterday. Ford directions said o ring. Loctite 680 on the first three threads and 35 nm.
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Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
This is what I did this summer when I installed my T-500. No problems so far. All four of the HPO fittings (HPOP and head) are the same.
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If DieselTechRon (God rest his Soul) and my memory from one of his videos is good,
He said he never did bother with the Loctite.
I agree with WalleyeHunter. The O-Ring is what creates the seal between the fitting and the HPOP body. The o-Ring IS the seal. Loctite is NOT meant to be a sealer of threads. I do however see the reasoning to want to have some type of thread (locking) on those lightly torqued fittings. Not something you want vibrating loose. Though ol' Ron said he never had a problem just "snugging them up". Didn't even need to use a torque wrench! But that's what years of experience will do for you. DDT
He said he never did bother with the Loctite.
I agree with WalleyeHunter. The O-Ring is what creates the seal between the fitting and the HPOP body. The o-Ring IS the seal. Loctite is NOT meant to be a sealer of threads. I do however see the reasoning to want to have some type of thread (locking) on those lightly torqued fittings. Not something you want vibrating loose. Though ol' Ron said he never had a problem just "snugging them up". Didn't even need to use a torque wrench! But that's what years of experience will do for you. DDT
Lead Driver
Joined: Mar 2004
Posts: 5,372
Likes: 108
From: Northern Indiana
If DieselTechRon (God rest his Soul) and my memory from one of his videos is good,
He said he never did bother with the Loctite.
I agree with WalleyeHunter. The O-Ring is what creates the seal between the fitting and the HPOP body. The o-Ring IS the seal. Loctite is NOT meant to be a sealer of threads. I do however see the reasoning to want to have some type of thread (locking) on those lightly torqued fittings. Not something you want vibrating loose. Though ol' Ron said he never had a problem just "snugging them up". Didn't even need to use a torque wrench! But that's what years of experience will do for you. DDT
He said he never did bother with the Loctite.
I agree with WalleyeHunter. The O-Ring is what creates the seal between the fitting and the HPOP body. The o-Ring IS the seal. Loctite is NOT meant to be a sealer of threads. I do however see the reasoning to want to have some type of thread (locking) on those lightly torqued fittings. Not something you want vibrating loose. Though ol' Ron said he never had a problem just "snugging them up". Didn't even need to use a torque wrench! But that's what years of experience will do for you. DDT
I would agree with you 100%. I replaced these fitting around 2 years ago. I didn't use loctite. They worked there way loose in the 2 years and I just had to replace the o rings again. This time with Loctite. I would defiantly use it if you have it.
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I'm a big fan of threadlock. Have had more than my share of fasteners work their way loose (e.g. starter bolts). I always have some "blue" medium-strength around. Loc-Tite 680 was the specific formula called for regarding HPO connections so that's what I used. I don't know why that specific formula (heat, pressure, oil?) but if it lasted 13 years then hopefully I get another 13 years out of these.
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