HPOP O-ring replacement
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New User
Joined: Aug 2006
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HPOP O-ring replacement
Hello first time poster here. Been lurking around diesel boards for a bit and learned alot.
I have a '94.5 F250 with a PSD and it's pouring oil into the valley pan. We just put a new turbo on the truck, so new turbo seals are in place. A local very reputable diesel shop advised that the o-rings on the oil lines going to the HPOP go bad and start pouring the oil out, I'm talking about 3 quarts in less than 60 miles of driving. I found the TSB on this site about the rings and the part numbers. How difficult is it to change these o-rings out. Does the HPOP have to come off the engine, and if so is it very difficult to do? I've put a new injector in that I had go bad and I considered that fairly easy and have done all my own work on just about all my gas engines, consider myself fairly knowledgable in doing mechanic work and would like to be able to start doing my own work on this truck as well.
Any help on this would be great.
I have a '94.5 F250 with a PSD and it's pouring oil into the valley pan. We just put a new turbo on the truck, so new turbo seals are in place. A local very reputable diesel shop advised that the o-rings on the oil lines going to the HPOP go bad and start pouring the oil out, I'm talking about 3 quarts in less than 60 miles of driving. I found the TSB on this site about the rings and the part numbers. How difficult is it to change these o-rings out. Does the HPOP have to come off the engine, and if so is it very difficult to do? I've put a new injector in that I had go bad and I considered that fairly easy and have done all my own work on just about all my gas engines, consider myself fairly knowledgable in doing mechanic work and would like to be able to start doing my own work on this truck as well.
Any help on this would be great.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
first off welcome to FTE you will learn lots and find many mods to spend your hard earned cash on. But on the other hand you will save yourself lots of money by doing these repairs yourself.
If you can do an injector you can handle this oil leak. The leak may be the line itself or the o-ring on either end. it also could be the gasket at the front of the HPOP but this large of a leak its unlikely. the best thing to do it spray the top of the engine clean with brake cleaner and blow it dry then find the leak for sure. there are a number of places it could be coming from just depend. so clean her up and see where it coming from.
If you can do an injector you can handle this oil leak. The leak may be the line itself or the o-ring on either end. it also could be the gasket at the front of the HPOP but this large of a leak its unlikely. the best thing to do it spray the top of the engine clean with brake cleaner and blow it dry then find the leak for sure. there are a number of places it could be coming from just depend. so clean her up and see where it coming from.
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New User
Joined: Aug 2006
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Thanks for the welcome 
I figured with 270k miles on the truck, and nothing has ever been done, I would just go ahead and replace all of the o-rings and gaskets on the HPOP and go from there.
I have a question, how do you like your Tymar intake? I've read alot about them, but can't find any for the first run of PSDs. I have swapped over to the Luk clutch and flywheel and gotten rid of that nasty dual-mass unit and that's been great so far.
I figured with 270k miles on the truck, and nothing has ever been done, I would just go ahead and replace all of the o-rings and gaskets on the HPOP and go from there.
I have a question, how do you like your Tymar intake? I've read alot about them, but can't find any for the first run of PSDs. I have swapped over to the Luk clutch and flywheel and gotten rid of that nasty dual-mass unit and that's been great so far.
Postmaster
Joined: Aug 2004
Posts: 3,948
Likes: 2
From: SHELTON, WA
is a early intake different than ours? i am pretty sure one will work on your truck. or you can make one. call dale he will set you up.
i agree clean it all up and go from there. hate to see you waste all that time and money and it not even be the problem.
i agree clean it all up and go from there. hate to see you waste all that time and money and it not even be the problem.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
i believe the tymar was originally designed for the 94 to 97 then also fit the superduties. check my gallery for pics of mine that i built but from all the pics of actual tymars its exactly the same. in my opinion its the best intake for the money next best maybe the for AIS but i haven't actually seen one to know.
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