Oil cooler no seal- pitting on block!
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5th Wheeling
Joined: Jan 2022
Posts: 48
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Oil cooler no seal- pitting on block!
I resealed my oil cooler on my 2001 F350 several years back. This engine had a lot of salt exposure from the previous owner. The rear header of the oil cooler(the oil filter mounting end) is not sealing to the block. Coolant is leaking out and oil is also getting in the coolant in small quantities. There was a lot of pitting on the engine block where that rear header mounts on and I believe that is the source of my trouble. What can I do to the engine block to smooth over the pitting?
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Someone else is also dealing with this right now. I’ll share a link to the other thread. Maybe you can pull some ideas from there.
https://www.ford-trucks.com/forums/1...l#post21066634
https://www.ford-trucks.com/forums/1...l#post21066634
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Another vote for JB Weld Steel. Clean the affected area down to BARE METAL. Grind some away if you must. But there can be no discoloration visible or you'll be doing that job again. Apply the JB weld to the flange area and trowel it down to smooth and level. Walk away for 24 hours. Read their instructions about working in freezing weather if you need to deal with that element of the job.
Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,415
From: Oologah, OK
Another vote for JB Weld Steel. Clean the affected area down to BARE METAL. Grind some away if you must. But there can be no discoloration visible or you'll be doing that job again. Apply the JB weld to the flange area and trowel it down to smooth and level. Walk away for 24 hours. Read their instructions about working in freezing weather if you need to deal with that element of the job.
In addition to that, I slathered it on the engine block and manifold face......
then I sold it... good riddance.
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5th Wheeling
Joined: Jan 2022
Posts: 48
Likes: 10
I discovered that the gaskets I had used for the cooler reseal were Fel-Pro which is a much softer blue seal. I knew those are inferior quality so I purchased a Mahle set and used a generous amount of weatherstrip/gasket adhesive on the block side all around the pitted area.
I used my air compressor hose to apply 16psi to the degas bottle with the overflow tube plugged off- as far as I can tell, the leak is repaired!
I used my air compressor hose to apply 16psi to the degas bottle with the overflow tube plugged off- as far as I can tell, the leak is repaired!
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timjk69
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
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Feb 27, 2005 10:47 AM
