Took the head off the Jeep tonight and realized I just got http://i118.photobucket.com/albums/o..._dlp/bruce.gif
Here's a pick of cylinder #2 :cry:
http://i118.photobucket.com/albums/o...p/Motor001.jpg
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Took the head off the Jeep tonight and realized I just got http://i118.photobucket.com/albums/o..._dlp/bruce.gif
Here's a pick of cylinder #2 :cry:
http://i118.photobucket.com/albums/o...p/Motor001.jpg
Ouch. That's still a might nicer than the Jeep Cherokee that rolled over in front of me on University this afternoon.
Yeah, I'll take a motor issue over a roll any day. It's going to get stroked to 4.6 since I will have it out.
*wads up gun wish list and throws in trash*
I have to ask how the hell did you do that? I have blown a few motors and seen NOS melt things so enquiring minds want to know. :?:
Driving home from Florissant at midnight and it was 10 below. It started to get hot so I pulled over and shut it off. Let it cool down for a bit and fired it back up and temp was normal again. Drove like mad to get to Divide so I wasn't stranded in the middle of nowhere. Never got hot again but it started pinging right as I came into town and then died. Checked the coolant and it was full but it seemed really hot. Never ran again so I hiched a ride to Woodland Park in a snow plow. I could tell the head gasket was blown so I got a new one and took it apart and there you have it. I think the thermostat froze or something because there wasnt a drop of coolant in the head.
did ya lose a freeze plug?
No, they're all there.
hmmm.. not much in that system.
thermostat
freeze plugs
blockage?
any coolant in the engine oil?
Freakin' thermostats. It's those $5 parts that get you in the end.
your radiator was frozen.
Happens a lot in real cold temperatrues
The motor starts, it gets all warm, but it can't get into the radiator because it's still frozen and nothing heats it up
then you burn it all off as you blow the head gasket.
You'll have to mill the head and deck, for sure they are warped.
sorry about the engine, but the kung fu bit I wasen't expecting allmost blue popcorn all over the keybord ,thats funny, painful, but funny
+1 just what I was thinkingQuote:
Originally Posted by JohnTRourke
Probably right about the frozen radiator. Something was frozen and prevented circulation, thats for sure. I didn't plan on being out in that temp, but that's CO weather for ya. I'll take a blown motor over going out "The Shining" style on the side of the road.
http://i118.photobucket.com/albums/o..._dlp/12160.jpg
The piston started to melt and the others did not it has nothing to do with a "Frozen radiator" (sorry that made me laugh my arse off). I bet the muffler bearing went bad and that caused the whole problem. [roll]
Look at the exhaust seat in the head and see if it has a crack. That is not what caused it but usually if you get any cylinder that hot it cracks the head.
I only posted one piston, there were more of the same. Something in the coolant system froze, I'm sure of that. I'll replace the thermostat and flush the radiator. I'll check the piston return springs while I'm at it :mrgreen:
Here is piston #5, gotta love those metal flakes sitting on the piston:
http://i118.photobucket.com/albums/o...p/Motor002.jpg
Trust me nothing "froze" but believe as you wish. :mrgreen:
I'll believe what I know, that something prevented cooling. I know about cars...what sub zero temps do to them, I'm just starting to learn about.
Someone always has to joke about the "muffler bearing", but that used to be an actual GM part...a reinforced rubber donut for supporting the exhaust system.
Is this 4.0 from back when they had the pressurized cooling system with the plastic tank and vacuum-operted diverter valve?
No, it's a 2001 XJ.
http://i118.photobucket.com/albums/o...ep017Small.jpg
I was just poking fun of you. You got that thing hotter than hell. [wink]Quote:
Originally Posted by Atrain
I know you were. [beer] And I know you're a car pro so I welcome your input...even if it's a kick in the nuts [balls] . Surely there are things I could learn from some of the gearheads here and that's why I posted this mess. If anyone can think of anything else it might have been, let me know so I can check it out and avoid this kind of catastrophe in the future. In the meantime, I'll be looking for a good machine shop and parts for the 4.6 stroker build-up.
Now I'm curious. If nothing "froze", what was the problem?
uh huh :roll:Quote:
Originally Posted by HunterCO
who's car is still running?
and who's car is a smoking heap of a ruin?
[poke]
Thermostat stuck (this is just my most logical guess). First off he checked the coolant and it was normal I am sure he would have noticed if it was frozen. I doubt in those temps even if the cooling fan was not working it would have ever reached the temps that it did. When an engine over heats at that level it creates air pockets as the coolant boils. When that happens the sending unit for the gauge and or light will not read even close to what the actual temp is (hence why he says it never over heated again or so he thought).Quote:
Originally Posted by Gman
With out looking at it I can't say for sure (possible head gasket depending on how it blew) but I can tell you one thing the last time I seen pistons melt was because of a lean NOS condition. Last but not least the radiator in that vehicle has phenolic tanks it would have split them if it froze. All I can say is he got that thing hotter than I thought possible for a stock vehicle.
I was also just messing with him about it being "Froze" he melted it down. [pirate]
OK. I was thinking it was the thermostat. I've definitely seen them choose to stick when the temps are at such wide ranges of heat under use and the extreme cold temps. It's just too bad that it didn't stick in the open position.
Failed the emissions test on my old Chevy Lumina. It looked like a complicated fuel mixture/emissions problem. New $5 thermostat and passed like a charm. Thermostat was stuck in the open position and threw everything off.
I can tell you that the coolant was not frozen when I checked it in Divide. That's why my guess was a stuck thermostat.
Hmmm...this is very tempting: http://www.golenengineservice.com/sp.../4_6l_260.html
I have great machine work done at with Gunn (no kidding).Quote:
Originally Posted by Atrain
Have they gotten over all of the computer hassles with the "modern" engine controls? I don't keep up with NAXJA forums anymore but a while back the advice was to find one with the older ignition system.
You could spend half that and do it yourself. I use Heads by Paul they are the first shop in the state that had a Serti. They do all my work for me personally as well as my customers.Quote:
Originally Posted by Atrain
My first guess would of been the oil pump was not working properly. You said the coolant wasn't frozen but very hot that means the thermostat wasn't stuck. With the temperature at 10 below, Even with no water and antifreeze flowing through the water jackets the frigid air blowing from the fan should of help reduce the engine temperature enough to prevent the pistons from total melt down. How was the engine oil level? I don't buy the frozen radiator deal, It just doesn't seem right to me.
I would love to spend half that...unfortunately, I dont have any experience building engines. If you can help a brother out, PM me. Local machine shop is 2K just for the machine work and assembly so I didn't think I can get it done much cheaper than 3500.
Quote:
Originally Posted by HunterCO
Oil was full, pressure was normal at the time. The engine builder I was talking to today also thought the the coolant froze, but in the lower part of the radiator. I really don't care so much any more, I just want to get my baby running again. :cry:
Quote:
Originally Posted by Wallary
If he didn't have oil pressure, he wouldn't have made it home. The engine would have seized pretty quickly.