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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 02-07-2011, 11:55 AM   #1 (permalink)
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Oil Cooler By Pass?

So my first post here… I have read lots of threads and they have been very helpful with many repairs I have done on my ’93 7.3 IDI F350 with 312K miles on it…
I have seen several conversations about Oil cooler replacement, and the question has been asked before about creating a bypass kit, so I am curious if anyone has done it.
I have a CNC Plasma Table so cutting block off plates would be fairly easy, then weld in A pipe fitting over the oil passage run a hose to a remote oil filter mount then through an external oil cooler (like a trans oil cooler) then back to the other bypass plate.
Has anyone done this?
I just want some other opinions be for I do this.
I have replaced this cooler once before and now it appears to be leaking again, just want to get rid of it.

Any Thoughts?
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Old 02-07-2011, 04:50 PM   #2 (permalink)
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I want to try cutting cooler headers and tapping the passages before I try fabbing parts. But if as you say you have access to fancy tools then you might want to do it your way.
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Old 02-07-2011, 05:02 PM   #3 (permalink)
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I would say not for me thanks...
The oil cooler does 2 things cools and in winter heats oil. I think you would be hard pressed to cool/heat the oil as fast as the OEM cooler does. You would need a massive pipe to feed your modified cooler, I would think due to the quantity of oil moved.

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Old 02-07-2011, 08:52 PM   #4 (permalink)
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You don't need any more pipe than what the stock cooler has... whatever that is. I haven't cut one up yet.
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Old 02-07-2011, 09:29 PM   #5 (permalink)
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Quote:
Originally Posted by HatchMan View Post
So my first post here… I have read lots of threads and they have been very helpful with many repairs I have done on my ’93 7.3 IDI F350 with 312K miles on it…
I have seen several conversations about Oil cooler replacement, and the question has been asked before about creating a bypass kit, so I am curious if anyone has done it.
I have a CNC Plasma Table so cutting block off plates would be fairly easy, then weld in A pipe fitting over the oil passage run a hose to a remote oil filter mount then through an external oil cooler (like a trans oil cooler) then back to the other bypass plate.
Has anyone done this?
I just want some other opinions be for I do this.
I have replaced this cooler once before and now it appears to be leaking again, just want to get rid of it.

Any Thoughts?
Oilcooler is an easy repair if done right.
Do what you want, but I'd sure keep the OEM cooler your gonna need it down the road. X2 on what sarge said.
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Old 02-08-2011, 05:36 AM   #6 (permalink)
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Oilcooler is an easy repair if done right.
You call lifting or pulling the engine easy? Nothing wrong with the oil cooler if you can access it. Well, that's not strictly true. A design which typically wears out and mixes coolant and oil is wrong.
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Old 02-08-2011, 07:30 AM   #7 (permalink)
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You call lifting or pulling the engine easy? Nothing wrong with the oil cooler if you can access it. Well, that's not strictly true. A design which typically wears out and mixes coolant and oil is wrong.
Definitely. A liquid-air cooler would be more efficient, much easier to service in the unlikely even it DOES need service, and with an in-line thermostat in a cooler line would allow for faster warmup of the engine oil.
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Old 02-08-2011, 08:14 AM   #8 (permalink)
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Do what you want, but I'd sure keep the OEM cooler your gonna need it down the road.
Right, I wouldn't consider it one of the more brilliant things I'd do to my pickup, most all diesels have oil coolers. Even the late gas engine pickups have an engine oil cooler nowdays. If mine leaked I'd reseal it right and go on with life. Mine's 19+ years old and never leaked a drop in 242,000 miles.
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Old 02-08-2011, 08:49 AM   #9 (permalink)
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I wouldn't eliminate the cooler, I just want to substitute something else for it, like an old-fashioned air cooler and remote filter mount. Probably with a couple of filters including one bypass type. I don't want the oil heat getting dumped into the cooling system because I have an auto trans and I am not abandoning the trans cooler in the radiator, although I may add another if it turns out to be necessary.

For the record, I think having no oil cooler would be nutso. I am just not impressed with the design of the stock unit. I might be more impressed if you didn't have to lift the motor to service it.
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