I have been running my twin setup for a few months now with no issues. It make between 60-65lbs of boost. I have ARP studs and fire ringed head. Today I drove the truck about a hour away and it started getting cold inside. Heater was just putting cold air out. I got home and radiator was low. Topped it off and heater was good then. I took the truck on another hour drive and ran it pretty hard. Got home and checked coolant and the overflow is black as well as inside the radiator. The coolant is oil filled and nasty. What the hell happened? Popped head gasket? There is no coolant in the oil and it runs perfect. What should I do? Thanks

Here is the setup: Twins, 62/14 over s400, HTT manifold, studs, o rings, fass 150/150, so pump, quad adrenaline w/ comp tune

Thanks for any info

 

You blew the gasket... No question in my mind... How many times did you re-tourque the head?

 

Re tourqued twice after the initial tourq. Is there any reason to try and do it again now or is it just toast? I have to drive this thing to work, have no other transportation

 

Trust me, I've been there 5 times in the last year. If the oil cooler pops, the radiator will be FULL of oil, I had that happen too, but the headgasket is bad. He's pushing compressed air from the cylinder into the water jacket. Thats why his heat cut out, and I'm willing to bet that his puke bottle is full, if not overfull. If you keep driving it, you WILL blow the oil cooler. Thats how I blew mine. FYI, the oil cooler is a few hundred bucks at least. And you need to retorque the head studs at least 5 times. I did mine 8, then at the next 3 oil changes. I did mine cold the first time, then warmed it up under no boost, torqued it again, then cold again, then warm... etc, etc. After the first 6 I drove it, torqued it hot, let it cool and torqued it again cold. Also, so you know, fire rings can crack and leak, they aren't generally recommended for street trucks for that reason. O-Rings should hold everything you can throw at them with studs torqued right.

 

One other thing, I have had this setup together for about 3 months now. After the first 30 minutes of running it I aquired a knocking noise. Sounded bad to me but it runs awesome and I have heard that sometime these things just aquire noises. I have been told by a couple people that this could be and is most likely an injector. One of the guys that said that says that the injectors could leak and cause this problem I have now. I dont see how an injector could cause oil/coolant mix but any info would be great. What you guys think? Thanks for all the opinions so far.

 

Some of this mix did blow out the coolant overflow onto the turbo piping also I forgot to mention.

 

Than just forget every thing I said.

 

Holy ****, you have what sounds like the exact same problems I'm having and same timeframe. Mine has started "chugging" pretty badly now as well when I let off the throttle. It's between my injectors or hg or possibly vp, but I'm pretty sure it's the hg at this point but don't want to pull the **** head again. I'll let you know what I find out.

Good to see another turbo mustang here as well.

 

HEAD GASKET... Injector might have caused the head gasket failure by sticking open, but I doubt it.

With air in the water jacket it is 99.9% of the time a head gasket failure, the other .1% is a cracked head or block... So instead of praying for it not to be a HG, pray that it is the HG!

 

OK, I talked to a local very knowledgable diesel shop. They have had the exact same circumstances on 3 separate trucks. All had very largs injectors like what I have. All 3 turned out to be screwed up injectors. New injectors were installed and everything cleaned out and trucks ran fine again. Does this make any since to you guys? It doesnt to me but this guy usually knows what he is talking about and builds high end trucks daily. Opinions?

 

I'm confused...now that you have new injectors...the coolant is not black? Did they explain why a failed injector will cause the coolant to turn black and blow out the overfill container? Sounds strange to me. How is soot/diesel/oil or whatever getting into the coolant? The Injectors may solve the knocking issue, but not the coolant issue.

 

I havent put new ones in my truck yet. This was what they told me happened to the trucks they worked on. I think it is a head gasket and will probably just order one to be sure. This will give me a chance to do a cam and valve springs while Im at it.

 

It ain't the injectors, and while you could have a bad injector also, don't get new ones until you fix the gasket, you may be loosing enough compression to not fire on whatever cylinder is leaking, causing your miss, and having nothing to do with the injectors. Take the truck to him if he's as good as you say he is... Cummins NE did a crummy job on my HG, I made them redo it 3 times til they got it right... Amazing how hard it is to get good mechanics these days.

 

Ok today I drive it because I had to. No other options. It was very cold out, about 15 degrees. Highest temp got to was 135. I got home and popped the cap on radiator and it is now green and looks good. There was still some black residue on the rubber gromet in the cap though. I dont understand whats up with this. It runs great and no smoke besides the normal black when getting on it and it does not run hot. I dont think it has a head gasket problem. Im stumped. And I have done absolutely nothing to the coolant, I did add some oil to motor because it was a couple quarts low(it leaks some but I know some went into the coolent too).

 

Something ain't right... Coolant doesn't just clean itself. The only way the residue would be gone is if it blew out the puke bottle. If it blew out the puke bottle, your still pressurizing the water jacket. If your still pressurizing the water jacket, its coming from a compression leak.