Oil Cooler replacement but temps still high? - Ford Powerstroke Diesel Forum
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Old 07-01-2011, 06:18 PM
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Oil Cooler replacement but temps still high?

Hi everyone. I did an oil cooler replacement for my friend on his '03. He was seeing a 16 degree delta normally, spiking to 20-22 degrees difference. I cut his cooler apart, it definitely had a bunch of silicate sludge in it. Upon replacement, he's still running around a 9-11 degree delta, and that's with a coolant filter, EC-1 coolant, recent thermostat replacement and no EGR system. Anyone know why he might be seeing temps like that? I did studs for him in December and I did a Restore flush prior to tear down so I doubt there's anything left as far as sludge in the cooling system. My oil cooler is 3 years old and I'm running a 4 degree difference and I have to do my HG's over again! Both trucks have Edge Insight CTS monitors, sinister EGR delete kits, 192 motorcraft T-stats, and 4" exhausts. I've got 146k and he's got 115k on mileage.
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Old 07-01-2011, 07:14 PM
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Head gaskets? Its all hearsay but scanning the forum alot of people havent had any luck with the black onyx ones....But like I said its hearsay
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Old 07-01-2011, 07:18 PM
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I'd have to ask how the coolant flush was conducted. There's a few different ways folks have been doing their flushes, and some have been more successful than others.

And this time when you do the HG's, go back to OEM gaskets and make sure you take the heads to the machine shop and fully checked out.
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Old 07-01-2011, 11:43 PM
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The way I conducted the flush was this: I made an adapter that attached to the hose that would normally be at the bottom of the degas bottle. The other end had a garden hose connection. I drained the system and removed the thermostat, replacing the housing with one that I punched the T-stat out of. I then ran the motor with the radiator pet**** open and the garden hose supplying water and a low pressure until all I got out of the radiator was clear water. I again drained the system. I then filled with a gallon of Restore, topped off with water, and then drove the truck for about 45 minutes and flushed the hell out of it again, this time draining and refilling about 6 times with distilled water. On the last time I filled with EC1 and was done. As for my HG's, the dealer never machined the heads, didn't realize that Ford specs to half-*** the job and not machine them. When I get around to it this summer I'll pull them off and have them cut.
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Old 07-11-2011, 06:48 AM
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Anyone else have some insight to this?
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Old 07-11-2011, 08:38 AM
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Was the flush done before or after the cooler replacement? If it was done after, more than likely the flush just broke loose all the rest of the silicate that was in your system and clogged up the new cooler too. Have you done a reverse flush on the oil cooler to see if that helps?
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Old 07-11-2011, 10:54 AM
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My truck is the same way... first drive after the cooler install was 8-10... it's still 8-10 after a year... I'll see 11-15 coasting down a hill after the pull up... but it's always been consistant 8-10 running flat ground in the summer... winter time, I have to work it pretty hard to get to 8, it'll stay 4-6 otherwise... I dunno... <shrug>
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Old 07-11-2011, 11:07 AM
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Quote:
Originally Posted by Acidsniper View Post
Was the flush done before or after the cooler replacement? If it was done after, more than likely the flush just broke loose all the rest of the silicate that was in your system and clogged up the new cooler too. Have you done a reverse flush on the oil cooler to see if that helps?
flush was done in December, cooler installed last month... Oil temps are hotter than coolant temps.
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Old 07-11-2011, 07:22 PM
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I'm just at a loss how my EOT/ECT's stay very close with a 3 year old oil cooler and warped heads, and he has a brand new cooler with no head gasket issues and is running what he is.
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Old 07-11-2011, 07:54 PM
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What about sensor accuracy?
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