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Old 05-19-2010, 02:16 PM   #1
Suffacated
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3406B Oil Cooler

Has anyone had or know of any issues with the oil cooler in a 7FB?
Did the original coolers have some kind of coating that could possibly come apart and plug up an oil tube or passage?
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Old 05-19-2010, 03:36 PM   #2
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Quote:
Originally Posted by Suffacated View Post
Has anyone had or know of any issues with the oil cooler in a 7FB?
Did the original coolers have some kind of coating that could possibly come apart and plug up an oil tube or passage?
All the same, tho a 7FB has a 25 year old cooler on it, and they do melt away after years. Check for yellow plastic pluggin it. That's busted water ferrals from a previous or current water ferral failure from a head gasket (that old. New ones are steel).
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Old 05-19-2010, 09:17 PM   #3
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Tony you misread it, he asked about the oil side coming apart and plugging an oil galley. I do not ever remember having that problem.
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Old 05-19-2010, 09:32 PM   #4
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Thanks Tony.
What I know so far is that for no particular reason a knock started knocking where it shouldnt have been knocking Monday morning. I pulled the valve covers, checked the turbo for missing parts, and even loosened the fan belts in order to eliminate a bad hub. I cut open the oil filter....it was clean. When I cracked open the injector lines, #1 sounded different than the rest.

So its off to the shop where I had 6 pistons installed a year ago. The latest is that I cracked #1 and almost stuck #2.
And something broke both oil tubes.

I'm meeting with the Cat warranty guy this afternoon. I'll take some pics and update y'all then.
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Old 05-20-2010, 01:35 AM   #5
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hey suffacate!!!i dont know if u were the guy that had a truck with Dr.Cat in LA but if you were i recommend to put your pump in std because if you dont u will have a problem dealer cat,but n lose the guarantee. i remember a red flc truck that you say ran at 75 MPH in the hills of Indio with 80,000 lowboy, if my memory dont fail. dont worry i passed it i did my high performance ,(melty piston)
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Old 05-20-2010, 02:34 AM   #6
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Trust me, I took care of that within the first 1/2 hr. back in the yard.
I assure you that while that truck is capable of running big, I know better than to abuse the extra power. I drive by ear with an eyeball always looking at my pyro and boost. The Cat Dr. knows me and knows that I'm the only one that drives that truck. He trusts my judgment so driver abuse isn't an issue.

So....here at the shop now and I was floored when I saw the carnage.

Only #1 was damaged...from the bottom up?
The rings were fine, the head and nozzle were fine and the liner, while cracked showed no signs of heat. We're not sure why #1 came apart? No signs of melted rings or pistons.....or a heavy right foot. Oh....and the Cat warranty dude didn't show. So....we moved on anyways. A new cooler has replaced the old one. We'll have the piston kit tomorrow and hopefully back on the road Friday or Saturday. We'll deal with the warranty crap later.




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Old 05-20-2010, 03:27 AM   #7
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I would also be replacing the valves that made contact to that piston. Was there any valve contact on any other piston? Are your exaust valves floating with the exhaust brake you have installed? Would not want to see a valve drop in to that new piston pack.
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Old 05-20-2010, 03:50 AM   #8
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omg!!!! i cant believe what im seeing. with close eyes im watching it. is that an E piston aluminiun(105-45000) in a B? this piston i have it in my collection(350 to 410hp). it has 14 mm, from the top to the fire ring. the pin is 55. that adapter(job)realy was wrong its to high. i have seen dozens of those. yea supposedly you get more power. dont only change that one but change all 6 to 14.5 compression . this piston has 22mm to the top to fire ring,ohhh!a tip change the jet to dobles tubes too!!!!!

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Old 05-24-2010, 01:19 PM   #9
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I'll get the truck back today. I'm not 100% sure on the piston kit part#, but I'll find out. Double tubes....got em.
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Old 05-24-2010, 07:11 PM   #10
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Quote:
Originally Posted by Johnp3 View Post
Tony you misread it, he asked about the oil side coming apart and plugging an oil galley. I do not ever remember having that problem.
Correct; again!!! No probs on the oil side of em. Can't happen (as it sits on the filter anyway)...
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