fuel leak disguised as an oil leak actually a coolant leak?

youngunbd

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This new-to-me 86 f250 is becoming fun! Camo headliner, new speakers and deck, working locks, just rebuilt the turbo, so now to track leaks!

Like I said I just rebuilt and installed the turbo, that took care of that bad oil leak. Now I drove it for a bit, parked it and tossed the cardboard down, black stuff poured down the tranny! :eek:

It's real thin like its oil with diesel in it. I got to lookin and feelin around and noticed the glow plug controller was sitting in a pool of what I later found out to be coolant. My local retired mechanic thinks the coolant is coming out at the glow plug controller, overflowing that little valley, then pouring into the valley between the flange of the tranny and the rest of the motor, then pouring down the sides. Which sounds about right cause that back wall is all soaking wet, and there is a little bit of oil down there in the bottom, which I think was left over from the turbo leaking so much.

This leak makes two puddles about a foot in diameter on each side of the tranny on the ground after shut down, and a good amount leaking out when driving slow. What say y'all?

The PO thinks it's a diesel leak possibly on the return lines, but I checked them and they all looked pretty darn dry and clean (not like cracked dry, just not covered in unknown stuff!)

I'll check everything out better tomorrow, I might seal around the GP controller when I do my front main, since I gotta drain coolant for both jobs. While I'm down doing that, do y'all recommend I check anything else? replace anything else? Request any pictures of certain things?

Thanks in advance to a kick-ass community!
 

Ruger_556

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Look close with good flashlight... Could be head gaskets (6.9 is known for trouble there) :cry:
 

bbjordan

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'86 F250 would have a 6.9 stock. Help us help you. Please put your truck info in your sig. That saves us from having to make assumptions. :) So if its stock, are those the original head bolts? Stock head bolts are not recommended for use with a turbo. How much boost are you making? With stock head bolts and head gaskets you are headed for a blown head gasket. Is it the original valley pan gasket? The extra heat and pressure from the turbo will cause more movement of the heads and intake manifold.

The old heads had coolant holes cast into the head on the intake side. These holes are sealed by the valley pan gasket. Over time, the valley pan will rust out causing leaks. The turbo may have accelerated that.
 

OLDBULL8

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The valley pan has a drain hole at the back, it's held down by a brass plug with a hole in it. pic is a Victor Reinze but yours may be a Fel-Pro, any fluid leaking into the pan will drain down the back of the engine, your leak, more than likely is diesel, if it's coolant, you should see a low level in the radiator. Where did you put the fuel line crossover when you installed the turbo? The fluid leak could be coming from there if it's under the turbo. There is no way for coolant to leak out of the GP controller. Did you relocate the controller? To find the leak (coolant or diesel) dry up the pan, run the engine for about 3-4 minutes then look for the for leak. Taste the fluid, if it's sweet then it's coolant, diesel is nasty tasteing.
 

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youngunbd

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The PO got the truck as a 2 wheel drive with a cracked head, he swapped motors with one that had lower miles and just had one side of the HG's done. And it's also a 4 wheel drive now, with a ZF5! :D

I believe the turbo came with this motor that's in it now.

The PO changed the GP controller to the solid state new one, and he put a sealant around the threads, everytime I look, even after having blasted it out previously, the GP controller is sitting in a puddle of coolant.

I need to get in there and inspect the fuel lines a lot better today because I didn't check them well enough yesterday. Oil consumption really isn't a good tester either because the front main leaks so bad when she is running that it shoots oil all over the under side of the truck, yes lol I'll fix that soon.

He said he also did the valley pan gasket recently before I bought it. He suspects it's a diesel leak also, he mentioned getting a spoon full of it and seeing if it will light with a lighter, if not to try a torch and see what happens heh I might try that one!
 

OLDBULL8

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GP controller, yeah overlooked it's the screw in style, not this one(pic below). If it is leaking around there, take it out and reseal it with the Teflon pipe dope, not the Teflon tape, tape is only for lubeing the threads, it's not a sealer.
 

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youngunbd

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It still brings up where all the liquid is coming from. I don't think enough coolant gets around the controller to cause all my leakage. There has to be a stronger leak somewhere, I'll get in there here after breakfast and try and poke around, maybe try and get a mirror back there.

Doing all the work I have has made me so darn glad it's a hypermax turbo lol I have seen an ATS and I wouldn't have even bothered trying to rebuild it myself, all the others just seem like such a pain to get out in the first place!

Also, it's usually just 5-6 pounds of boost. EGT's don't get up too high either but I haven't really pushed her yet
 

OLDBULL8

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GP controller, yeah overlooked it's the screw in style, not this one(pic below). If it is leaking around there, take it out and reseal it with the Teflon pipe dope, not the Teflon tape, tape is only for lubeing the threads, it's not a sealer.
 

youngunbd

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Might have possibly just killed a few dozens birds with half a stone!!

So I went to start the truck today and it pissed a good amount of oil out the hot side and into the down pipe and out the clamp and you get the picture... so after a quick call to Ron at Hypermax (great folks btw) he asked me about the valley pan, I mentioned that's where I thought I had oil leakin from already. He asked if it had the holes poked through it for the oil drain.... Well after a little bit of cursing to myself, I took the intake off, took the drain off, and what do you know.... NO HOLES!! The PO mentioned he had replaced the valley pan gasket recently and I think he either forgot or didn't know to poke holes in it for the oil to drain!

So I'm gonna go knock that out real quick, piece her back together... and hope to sin no oil spews down the tranny when I get back!!
 

icanfixall

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Thats really odd about the valley pan possibiliy being the problem. All valley pans are supposed to be designed to handle the turbo oil return now. Not so in the early engines. Thats why most owners would poke holes thru the top two layers of metal as you are looking thru the drain hole. Please don't use a drill. A ice pic works fine for this. Remember this is an oil baffel and its job was to strain out the oil as the cdr sucked up the blowby into the back of the intake.
 

youngunbd

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Ron was saying is that it's a splash guard essentially to keep oil from splashing onto the CDR valve that has since been relocated due to the turbo. I just poked a couple holes thorough and am ready to put it all back together and see what happens!
 

youngunbd

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So I punched the holes, re-assembled... wouldn't start!!

The mechanic and I traced gremlins to find the switch that senses the clutch was bad, so we jumped it, she fires right up, perfectly, every time!! So far no leaks!!

But now I'm off to the yuppy part of town where they won't tolerate leaks! So this will be the ultimate test! :D
 

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