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post #1 of 8 Old 08-20-2013, 07:01 AM Thread Starter
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NOW WHAT?

My truck developed a coolant leak turns out it is the big doughnut o-ring (pic below) on the intake manifold. It is eaten away which makes me think it is something in the coolant (CAT-5). I did catch what was left out of the radiator and this is what I found (pic below). Some say that diesel is the only thing that would cause that and I am inclined to believe that. So in the bottels cat 5 and ? which I think is diesel or it could be oil but I do not think oil would eat at the o-ring like that. What do you all think. If it is diesel from what I understand it is probably a cracked head. I do not know how else diesel could get there.




Brian
2006 F-350 CC Lariat FX4 4x4 LB
2007 34' Ragen Toy Hauler Fifth Wheel
ARP's, Dfuser coolant filter, Blue FPR spring,Fumoto valve for oil and block drains, BPD EGR cooler, Edge CTS, Cat EC-1 coolant, 6.4 banjo bolts
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post #2 of 8 Old 08-20-2013, 08:24 AM
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Wow, I don't think that diesel fuel would eat that big o-ring but what do I know, I understand their are different types of rubber but I think ours are a solvent based. you don't have many miles on that rig do you?

Tom
2003 CCSB 4X4 6.0 Born on 5/03 Tuned by Vivian, 4" Turbo Back Exhaust, Edge CTS w/EGT, Coolant filter. ELC. fuel pressure gauge,

2002 SCLB 4X4 7.3 Stock
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post #3 of 8 Old 08-20-2013, 08:50 AM Thread Starter
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Originally Posted by poorboy1964 View Post
Wow, I don't think that diesel fuel would eat that big o-ring but what do I know, I understand their are different types of rubber but I think ours are a solvent based. you don't have many miles on that rig do you?
135k on truck and about 27k since I did the heads two years ago.

Brian
2006 F-350 CC Lariat FX4 4x4 LB
2007 34' Ragen Toy Hauler Fifth Wheel
ARP's, Dfuser coolant filter, Blue FPR spring,Fumoto valve for oil and block drains, BPD EGR cooler, Edge CTS, Cat EC-1 coolant, 6.4 banjo bolts
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post #4 of 8 Old 08-27-2013, 04:20 PM
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there is no doubt whatsoever that you have very significant amount of some sort of oil in that coolant. fuel is the most likely one. Here's the bad news, 1 o-ring failed, the rest are not far behind, also ALL coolant hoses.and that's after you figure out how it got in there. Possibly cracked injector cup? definitely head is good possibility. wish I could say something happier.

2005 F350 srw Crewcab lariat. 6.0 diesel aka Sherman
Carstairs Alberta
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post #5 of 8 Old 08-27-2013, 04:26 PM
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diesel will do that, maybe oil, when my injector cup cracked the diesel ate the thermostat o-ring, resivor lid gasket and ate the plastic resivor(diesel) on my 7.3.

dip a paper towel in the top of those bottles and smell it, diesel has a very distinctive smell.

2002 F250 7.3/JW Tow master 4r100 200k miles
Mods:explorer heater valve, WR GP relay, RiffRAff boots, lariat overhead console, Hydra chip, 6637 mod, 6.0 cooler, AIH delete and isspro2 trans, egt, and boost gauges. 92 gallon aux tank with a total capacity of 130gallons, 1800 mile range , 4" MBRP straight Piped. 2" Warrior shackles
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post #6 of 8 Old 08-27-2013, 08:05 PM Thread Starter
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So I pulled my head and they were cracked around the injector cups the cups themselves don't crack I am told. So had the head repaired and reassembled. New oil cooler, new water pump and o-ring on heater hose metal tube, new thermostat, new head gaskets, new cat ec-1. All done in one week start to finish. No leaks, no drips, no errors, (nock on wood). I hope this is the last time I have to pull the heads it is getting too familiar.

Brian
2006 F-350 CC Lariat FX4 4x4 LB
2007 34' Ragen Toy Hauler Fifth Wheel
ARP's, Dfuser coolant filter, Blue FPR spring,Fumoto valve for oil and block drains, BPD EGR cooler, Edge CTS, Cat EC-1 coolant, 6.4 banjo bolts
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post #7 of 8 Old 08-29-2013, 05:51 PM
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repaired or replaced?

-Matt

Ford Senior Master Tech

2015 F-250 XLT 6.7L

2006 F-250 6.0L SOLD
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post #8 of 8 Old 09-02-2013, 05:28 PM Thread Starter
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So in seven days pulled the heads, sent to machine shop had cracks in head at two injector cups the repaired them 300.00. Reinstalled the heads with new head gaskets, new water pump, new thermostat, new o ring on metal tube to top of engine, new rocker gaskets, new intake gaskets, new oil cooler (had gone from 3 to 10 degrees). Just got back from a 400 mile camping trip with no problems. No codes.

Brian
2006 F-350 CC Lariat FX4 4x4 LB
2007 34' Ragen Toy Hauler Fifth Wheel
ARP's, Dfuser coolant filter, Blue FPR spring,Fumoto valve for oil and block drains, BPD EGR cooler, Edge CTS, Cat EC-1 coolant, 6.4 banjo bolts
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