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Old 07-06-2013, 04:42 PM
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Oil in the valley

Help!

Having the oil-accumulating-in-the-valley problem.
1997 7.3, less than 100K miles.
I had an earlier similar problem that was diesel getting in there, fixed the fuel bowl problem and stopped the fuel leak but there's also oil showing up. That probably explains why it was so hard to figure out if it was oil or fuel, the two mixing together.
Definitely oil this time.
Redid all the HPOP o-rings with parts from Bob the diesel guy, did the bottom plug as well, didn't solve it.
Doesn't leak at idle, doesn't even seem to do it in the driveway when revving it to 3000rpm or more; have to drive it around to get the oil showing up.
It's showing up at the front of the valley under the HPOP so I'm certain it's not the turbo pedestal bolts.
There's nothing obviously leaking but clearly I can only look at it when it's sitting still. Oil vapour gets over the area so running my finger around fittings isn't telling me anything.
I didn't think to do the rear plate seal, nothing obvious leaking there but have ordered that seal today.
Don't really want to drop $200 for new oil lines (these are the old threaded kind, not the quick-connects) but wondering if these are common fail points?
I did notice faint stress cracks on the HPOP body when it was out, don't appear to be deep enough to be leaking but hard to tell with aluminum? Again, don't want to drop lots of coin on a new HPOP, thoughts on using JBWeld as a test? If it stops the leak then not going to leave it like that, time for a new one.

I've read just about every thread here about this problem, any advice is appreciated, especially if there might be another likely source of the leak that I've overlooked.

Thks,
Peter
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Old 07-06-2013, 07:37 PM
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Did you also do all the rail plugs (same O-rings as the ICP and HP oil hoses-to-head joints)? If the HP oil line go, you will know it as it will spray oil everywhere at high pressure. Heck, I lost 4 quarts in 10 miles when one of my HPOP-to-HP hose O-rings went. How about the HPOP-to-Front cover gasket? Cheers!
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Old 07-10-2013, 12:00 PM
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This leak is definitely near the HPOP. This is a 97, HPOP oil lines are threaded, no o-rings. Rear plate is completely clean and dry so that's not it. Yes, changed out the HPOP-to-Front cover gasket
After another couple of cans of brake clean, the source appears to be somewhere near the driver's side of the HPOP.
I never even thought of the oil rail plugs, there is one very close to the area where the leak appears to be coming. Going to keep a close eye on that area, hoping you're right. Ordered a new plug & gasket from Bob just in case.

Cheers,
Peter
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Old 07-10-2013, 05:55 PM
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Yes the hoses are threaded (with flares for sealing at the fittings at both ends of the hose), but the fittings are straight-threaded o-ring boss types where they seal at the HPOP and at the heads. I lost one of the HPOP fitting O-rings. Cheers!
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Old 07-10-2013, 07:45 PM
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You were right: front oil galley plug on the driver's side. Part is on the way from dieselorings. $8 from him, $40 from the International dealer.
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