HPOP leak
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Freshman User
Joined: Nov 2009
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From: Squamish, BC
HPOP leak
Driving a 2000 f550 service truck for contract welding and HD mechanical work. 2002 7.3 diesel for power. New to the forum but read all the hpop posts on this forum. I gather that most of the fittings and plugs on a hpop are considered non servicable but you can still find replacement orings. My hpop has just developed an oil leak from the cover at the back of the pump. I'm refering to the one secured by a snap ring. I have a new pump sitting on my desk but I don't want to replace my old one if there is a reasonable work around to my problem. Any help would be really appreciated. Tom
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Welcome to FTE Tom. There's an o-ring behind that plate. Replacement O-rings for Ford Diesel Engines
How big is your leak? Usually a leak from the rear plate is fairly small, but it's an unusual leak so it's always good to hear details.
How big is your leak? Usually a leak from the rear plate is fairly small, but it's an unusual leak so it's always good to hear details.
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Freshman User
Joined: Nov 2009
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From: Squamish, BC
Chris
Thanks for your reply.
The leak is about a quart or so every 100 miles or so. But it's messy. On the job I may have to have the engine running to run the air compressor of the crane or something and there's a puddle of black oil there when I leave. Not a good thing for a man in my business to leave behind.
The link you left for me was exactly what I'm looking for. I was told by the man who sold me the replacement part that it was a very unusual leak and that he could offer me no solution except a replacement pump. He's a good guy though because he told that to me in just such a way that I had a good idea that there was an alternate solution out there. He just couldn't tell me straight out.
I see by the picture in the link that this is an axial piston pump so I expect there'll quite a bit of spring pressure behind that plate. Ever popped one off?
Thanks for your help.
Tom
Thanks for your reply.
The leak is about a quart or so every 100 miles or so. But it's messy. On the job I may have to have the engine running to run the air compressor of the crane or something and there's a puddle of black oil there when I leave. Not a good thing for a man in my business to leave behind.
The link you left for me was exactly what I'm looking for. I was told by the man who sold me the replacement part that it was a very unusual leak and that he could offer me no solution except a replacement pump. He's a good guy though because he told that to me in just such a way that I had a good idea that there was an alternate solution out there. He just couldn't tell me straight out.
I see by the picture in the link that this is an axial piston pump so I expect there'll quite a bit of spring pressure behind that plate. Ever popped one off?
Thanks for your help.
Tom
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
Likes: 1
From: Northern Colorado
Make VERY sure that your leak is on the back plate. THIS IS A RARE, VERY RARE spot for the HPOP to leak. Many have found oil on the back side of the pump only to find that it was a slow seep from one of the discharge hoses or the small plug on the back of the HPOP that causes the oil to settle on the lip of the HPOP rear plate lip.
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Freshman User
Joined: Nov 2009
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From: Squamish, BC
Well yes. I'm pretty sure I have it right but I'm gonna check again, for sure. Thanks for that.
Tom
Tom
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Post Fiend
Joined: Mar 2007
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From: Texas
Excellent point Bob. I should have mentioned that myself.
Tom, to give you an idea of the kind of folks you're dealing with, guzzle92 who just told you to make sure you had the right part, is the same guy you just placed that order with in the link I provided.
It's probably an o-ring leak, but he's right. It's best to make sure you order the right one.
Tom, to give you an idea of the kind of folks you're dealing with, guzzle92 who just told you to make sure you had the right part, is the same guy you just placed that order with in the link I provided.
It's probably an o-ring leak, but he's right. It's best to make sure you order the right one.
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Freshman User
Joined: Nov 2009
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From: Squamish, BC
Well thanks to both of you.
I'm sure going to make sure I have it right though. I can see the possibility that I may have made a mistake, all right.
Tom
PS. Just ordered all orings possible. Bases covered. Thanks for the tips.
I'm sure going to make sure I have it right though. I can see the possibility that I may have made a mistake, all right.
Tom
PS. Just ordered all orings possible. Bases covered. Thanks for the tips.
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Freshman User
Joined: Nov 2009
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From: Squamish, BC
Well I guess you're right and my face is a little red. After a closer look at the rear of my hpop I can see the leak comes from the smaller plug that is higher and to the left. The oil from this leak makes it's way into the snap ring groove and that's why the leak appeared to be coming from the plate behind the snap ring. Glad I ordered all the orings and not just that one. Thanks again for the pointer. Tom
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Freshman User
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From: Squamish, BC
Guys
I just wanted to bump this up 'cause i have a question or two. I completed the repair or my hpop yesterday and so far so good, but.... form what I read before hand was that I needed to remove the pump before attempting to change the seal on the rear plug 'cause there's a check ball behind the plug that'll become dislodged or lost if you don't have the pump in an upright position. So I went to work and pulled the pump and put in the vice. To start with, the plug was loose, which explains why the oring went. And yes, the threads on the plug and pump body were perfectly fine. The plug almost came out by finger and there was no check ball in there at all, just a gallery with nothing in it. I coulda just removed the plug, replaced the oring and put the plug back in there without all the work of removing the pump. Go figure...
Any comments?
I just wanted to bump this up 'cause i have a question or two. I completed the repair or my hpop yesterday and so far so good, but.... form what I read before hand was that I needed to remove the pump before attempting to change the seal on the rear plug 'cause there's a check ball behind the plug that'll become dislodged or lost if you don't have the pump in an upright position. So I went to work and pulled the pump and put in the vice. To start with, the plug was loose, which explains why the oring went. And yes, the threads on the plug and pump body were perfectly fine. The plug almost came out by finger and there was no check ball in there at all, just a gallery with nothing in it. I coulda just removed the plug, replaced the oring and put the plug back in there without all the work of removing the pump. Go figure...
Any comments?
