Overheating ( and some head consult )

[Nacho-RT74]

Yesterday after the Holand-Spain world cup final ( VIVA ESPAÑA!!!! ) I began to rev up the engine in Neutral up to 5500 RPMs, since I got a nice thunder noise with my new mufflers  ( I didn't want to make the horns sound, revs are better to make noise LOL ) and suddenly began to overheat HARD. The upper radiator began to blow up UGGLY. Water was boiling and overflowing at the reservoir... I used water all around the radiator, hose and water pump to get lowered the temp fast as posible, before the hose blow out!

Stuck T-stat ? last time I got the T-stat stuck, it happened just right the opositte with the upper hose.

Ideas?

[elacruze]

Ugh.

Head gasket.

[Nacho-RT74]

is a probably fail, or something for sure ?

[Nacho-RT74]

 

[elacruze]

Well, How long were you revving it? Consider the science-
We could run a 1000hp racer for 9 seconds and not boil it over.
You can run full throttle down the highway for some time without boiling.
You were revving your engine with no load, which in any case makes less heat than loading the engine. So heat can't be the cause. Even if it was, it would take some time to come up to and exceed temperature, and you said it happened suddenly. A blown head gasket will instantly overpressure the radiator, and as soon as the water leaves the jacket the air/gasses overheat and expand making it worse.

Got a compression gauge or leakdown tester? How does the engine idle now?

[Nacho-RT74]

Yes, without load, altough I tried to make some burnout couple of times... you wanna know that I never have been able to make a burn out with my car ? ( 400 stock, 166K TC, 3.55 gears with SG, on Dunlop SP Sport 255/60-15 tires )

the revving up process was just couple or 3 seconds every time, got iddle, then some couple of times more for couple of seconds then got iddle again. Maybe once it was by 5 seconds. I think made that cicle around 7 or 8 times in 5 minutes. All the throttle opening was made slowly, never made a quick pedal press

Is iddling and driving perfect. I think can say that beside the boiling at overflow reservoir, the hot reading ( max top reading ) and the upper hose blowing up, everything loooks pretty much normal

some details... Once cold, had to refill radiator around 1,5 gals.

on the cooling process adding water over radiator and all around, the hose got some instant shrinks ( dunno if that would be the right therm ) couple of times maing PLOP. I guess of course the suden temp change with the water I was adding all around

[b5blue]

You have a spring in the intake hose? Maybe intake hose sucked shut and cut off coolant to pump? 

[jeryst]

Take off your radiator cap. Start the car, let it warm up normally, and watch the water in the radiator.
You should see some type of movement of the water.

If you see bubbles, you probably have a cracked head gasket.
If you dont see any movement of the water, you may have a stuck thermostat or bad water pump.

I just recently had something wierd happen with mine. It started to overheat for no good reason. I thought it was the thermostat, so I drained some of the coolant out so that I could replace the thermostat. When I looked in the radiator, I saw a bunch of debris. It turns out that when the previous owner had the car, he must have left the cap off or the top hose disconnected. A mouse built a nest in the top of the radiator. Over the years, the debris (insulation, fabric, stuffing, threads, etc) worked its way down through the radiator, and was slowly clogging it up. I had to have the radiator re-cored.

[Nacho-RT74]

You have a spring in the intake hose? Maybe intake hose sucked shut and cut off coolant to pump?  

no, stock molded one... I hate the universal spring ones look ( although the lower one on mine is universal spring kind  )

[squeakfinder]

You have a spring in the intake hose? Maybe intake hose sucked shut and cut off coolant to pump?  

no, stock molded one... I hate the universal spring ones look ( although the lower one on mine is universal spring kind  )

I think what he is saying,  "Is there a spring/wire inside the hose?"

[Nacho-RT74]

no... original molded ones are not with springs as far I know, thats what I meant. Is ( or it was LOL ) NOS when I got and is not with spring

[TylerCharger69]

I dunno....but the stock lower hose for mine has a spring in it to keep the hose from collapsing....The one molded to shape...not the universal kind

[maxwellwedge]

I dunno....but the stock lower hose for mine has a spring in it to keep the hose from collapsing....The one molded to shape...not the universal kind

All the factory BB lower hoses came with the spring inside as TylerCharger69 has - for the same reason...to stop the hose from collapsing shut or near shut.

[maxwellwedge]

is a probably fail, or something for sure ?

Probably the English Judge's fault!   

[Nacho-RT74]

is a probably fail, or something for sure ?

Probably the English Judge's fault!   

[Paul G]

My 73 440 had a spring in the lower hose....

[b5blue]

Where can you get new springs to put inside the lower hose? 

[squeakfinder]

Where can you get new springs to put inside the lower hose? 

I'm not saying they are not available. But the common practice now is to pull the spring from your old hose and transfer it to your new one. Or maybee somebody at the parts counter can scavenge one from another hose that's been sitting around for a few year's. 

[Nacho-RT74]

Do you think is EASY to get cracked block or heads ?

after several consults it looks everything points out to headgasket fail ( specially they are composite and Venezuela made, not preciselly a quality guarantee on these ) but wondering about heads and blocks fails.

block is sleeved, so I think is not easy to get a crack at cilinders...

[b5blue]

I would think gasket much more than cracked anything. 

[Paul G]

Do you see any white milky substance in the oil? If so you have a leak between the coolant passage somewhere and the oil passage. If you get coolant explode out of the radiator or coolant bottle when it warms up to normal temp, cylinder pressure is leaking in to coolant passage. Any of these require a tear down and investigation. My guess, as stated already, is a head gasket.

As far as lower hose springs, I have always swapped the spring from the old hose to the new one. If the hose is getting old and soft it could collapse without a spring inside it.

[maxwellwedge]

Where can you get new springs to put inside the lower hose? 

I heard of some people buying them from some Mustang site.....I have been re-using old ones.

[Nacho-RT74]

Removed first head ( passenger side )and found... everything perfect with gasket  . I hope to find A DESTROYED GASKET ON DRIVER SIDE.

Dunno why I have allways suspect I have had some problem on driver side since EVER!!! so thast my hope. In fact I got a bent push rod on that side recently rebuilt my engine.

BTW, found the head I have there is a 37xx902 ( can't recall the Xs ) cast and looks smaller combustion chamber than the 452 I have storaged for the cam and piston upgrade. They were "decked" when I rebuilt the engine back in 2002, but I don't think enough to call it MILLED

and I can't find that head cast number on my records

[Nacho-RT74]

LOL, found it on the DC manual

3769902 for 74 Engines

something good about them againts the 452s ? actually are they with smaller combustion chamber ? what about the seats hardening ?

[Nacho-RT74]

aaaaaaaaaaaaaand just found this about 902s:

http://www.moparchat.com/forums/showthread.php?t=2178

"they are often found to be cracked"