high EOT temps while pulling 12k lb trailer
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
Had the same issue with EOTs. PO tortured the oil cooler. I cleaned until I could drink out of my coolant system. After 3 oil coolers, I decided to install the BPD oil cooler relocation kit. Oil temps and coolant temps went down because the oil cooler was removed from the heat between the cylinders. I'm about to remove my coolant filter cause if my oil cooler ever needed changing, it's a 30 minute job.
I pushed EOTs of 255 prior, but can't get over 225 now. Deltas are never more that 12 degrees even under 102 degrees weather towing 85 mph.
I tow 80 mph and don't take it easy on my truck. I push it hard while towing. I used to tow a 32 ft bumper pull that weighed 9000. I now you're a 34 ft 5th wheel that weighs 13000 lbs after the wife packs it.
I pushed EOTs of 255 prior, but can't get over 225 now. Deltas are never more that 12 degrees even under 102 degrees weather towing 85 mph.
I tow 80 mph and don't take it easy on my truck. I push it hard while towing. I used to tow a 32 ft bumper pull that weighed 9000. I now you're a 34 ft 5th wheel that weighs 13000 lbs after the wife packs it.
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Mountain Pass
Joined: Sep 2003
Posts: 143
Likes: 0
From: So Cal
I was going to have North County Ford do the BPD oil cooler relocate kit but instead my buddy talked me into taking it to Diesel Tech in San Jacinto. He really seems to know if stuff and he is $1500 less than the dealer to install. I appreciate everyone's time and as always am thankful for the knowledge here!
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
The oil cooler relocation was after the EGR delete because the EGR was deleted when I purchased the truck. A plug was welded into the ruptured egr exhaust pipe at the up pipe. After the first oil cooler replacement, I put a full egr delete in to keep the coolant from flowing across all that soot in my ruptured egr cooler exhaust gas passeges.
I conclude, once you've ruptured an oil cooler and an EGR cooler (which the PO had done), you'll never get the coolant system clean enough to NOT plug a new oil cooler. Of course, this is prior to all the advances in back flushing the oil cooler were developed. I never tried that, but judging from the looks of the last plugged oil cooler I cut apart, back flushing wouldn't have worked long term.
I conclude, once you've ruptured an oil cooler and an EGR cooler (which the PO had done), you'll never get the coolant system clean enough to NOT plug a new oil cooler. Of course, this is prior to all the advances in back flushing the oil cooler were developed. I never tried that, but judging from the looks of the last plugged oil cooler I cut apart, back flushing wouldn't have worked long term.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
The clogging was 95% within 1/2” of the coolant inlet (the 1/2” of the plates adjacent to the inlet hole). 5% was more than 1/2” away from the round coolant inlet. All just a visual estimate.
I hit it with a hose pipe into the coolant outlet port to back flush it and caught the outflow. That had little affect. I did this before I cut it apart. Thus my pessimism on how much a backflush would have worked. Maybe with some chemical soaking, it would have loosened it up. Just one man's opinion based on my personal experience. But, after cleaning my coolant system, I was religious about what I put in it.
I hit it with a hose pipe into the coolant outlet port to back flush it and caught the outflow. That had little affect. I did this before I cut it apart. Thus my pessimism on how much a backflush would have worked. Maybe with some chemical soaking, it would have loosened it up. Just one man's opinion based on my personal experience. But, after cleaning my coolant system, I was religious about what I put in it.
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
I had a little "goop" on my fins near the inlet port. I decided it was a result of the oil and soot residue from the prior ruptures of the oil and egr coolers. Again, backflushing it after it was removed did not seem effective. I didn't have near the debris shown in your photos. I posted pictures in this forum way back then.
I repeat. I got to 254 eot when towing at 75 with that oil cooler. I just happened to have a tire problem that delayed me long enough for the ambient temps to fall 15 degrees before I got back on the road. The cooler weather provided lower oil temps for the remaining hours to get home.
I repeat. I got to 254 eot when towing at 75 with that oil cooler. I just happened to have a tire problem that delayed me long enough for the ambient temps to fall 15 degrees before I got back on the road. The cooler weather provided lower oil temps for the remaining hours to get home.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
I still dont understand why you would spend all that money before you backflushed? I know countless people who have backflushed before replacing the oil cooler and havent had a problem since. Could of saved yourself $1000+...
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
AT that time, nobody had had any long term success with back flushing. I back flushed it after I removed it and before I cut it open. It still had so much cr as o in it I KNOW back flushing would not have worked. I still have my doubts about this that say they have long term success with back flushing.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
AT that time, nobody had had any long term success with back flushing. I back flushed it after I removed it and before I cut it open. It still had so much cr as o in it I KNOW back flushing would not have worked. I still have my doubts about this that say they have long term success with back flushing.
AT that time, nobody had had any long term success with back flushing. I back flushed it after I removed it and before I cut it open. It still had so much cr as o in it I KNOW back flushing would not have worked. I still have my doubts about this that say they have long term success with back flushing.
All I know, is my 2003 Excursion 6.0 took the backflush wonderfully! I ended up doing it twice in about 6 months, and its been fantastic since! I have the stock oil cooler, 297,XXX miles on it, my deltas solo are never higher than 9°, and towing our 10k Travel Trailer I never higher than 12°. Whenever people talk about high deltas all I ever hear is replace the cooler... for $1000+, why not take a chance and flush first? I have about $150 in a flush, well worth it to me. Put on the filter system, change filters on it about every 6 months and all is good. You all must have some DEEP pockets, to spend spend spend?
