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Author Topic:   Radiator Problem
speedy2
Dirt Full Roller

Total posts: 54
posted April 04, 2005 06:48 PM  
For some reason the fluid is comin out the over flow tube but the temp doent get over 210 max. ive got a 29-31 lbs stant radiator cap on it. anyone know why this is happenin. Had same motor in end of last year with no problems and now cant keep fluid in radiator.

wrenchturner10
Dirt Forum Racer

Total posts: 80
posted April 04, 2005 07:57 PM  
Look through the fins on the radiator and see if the tubes are rounded on swelled. You could possibly have a slight head gasket leak that dosen't show at low RPMs.

smallrock98
Dirt Forum Racer

Total posts: 100
posted April 05, 2005 04:59 AM  
Well, if you are not overheating than pressure is building in your cooling system from somewhere else strong enough to open your heavy duty cap. I hate to say it but I think you may have a cracked head. Hopefully it is just the headgaskets so at least try there first. But...since you are taking the heads off anyway to change the gaskets, you may as well get them magnufluxed just to be certain.

istock59
Dirt Forum Champ
Total posts: 501
posted April 05, 2005 05:56 AM  
Have you replaced the cap? I'd try that first before tearing into the motor....

speedy2
Dirt Full Roller

Total posts: 54
posted April 05, 2005 01:04 PM  
I had the heads freshen up at jr motorsports in ames and they didnt leak when they came off. Its a brand new radiator cap since sat. Ill probobly take the heads off and chech the gaskets. Thanks for the replys

speedy2
Dirt Full Roller

Total posts: 54
posted April 09, 2005 01:29 PM  
I found the problem!!!!!!!!!!!! Changed head gaskets with the good fel-pro gasket and it sealed up. The gasket or the head didnt show much but the block had a little discoloration to it in between the 3rd and 5th cylinders. Thanks guys for the help

speedy2
Dirt Full Roller

Total posts: 54
posted April 26, 2005 08:01 PM  
Sorry guys problem came back on race nite. ive compression checked all the cylinders 4 times and nothen, no bubbles anywhere. took off aluminum edlebrock water pump and put on stock water pump. As of tonite theres no bubbles and water still stays in radiator. Ill post any changes as they come happen but hopefully this is the problem.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 27, 2005 06:27 AM  
Kinda sounds like the head gaskets aren't sealing. If it's not a cracked head (Rosco did mag them right?), then it could be a hairline crack in the block on the deck, or a head bolt that didn't get enough sealer on it?? What brand of radiator is it?

istock59
Dirt Forum Champ
Total posts: 501
posted April 27, 2005 07:48 AM  
Did you retorque the head bolts after your first heat-cycle with the Felpro gaskets? If you've got a head or deck that's not quite flat, the heating and then cooling may have let the gasket fail again.

JRs has a bottle of heavy duty leak sealer, Z4, I think. I use it in every new motor I put in. Try a bottle of that too.


jpotter94
Dirt Forum Racer

Total posts: 94
posted April 27, 2005 09:22 AM  
sounds to me like your head or block is warped in between 3 and 5 intern this is putting pressure in the radiator system,as well as not letting the head gaskets seal..pull the heads have them surfaced and make sure the block is flat..i just went thru the same thing on my late model motor..

speedy2
Dirt Full Roller

Total posts: 54
posted April 28, 2005 05:11 AM  
i raced last nite and still got same problem. the heads were surfaced when they were freshened. ive got a bottle of that Z4 in the garage. If its gettin presure in the the rad. i dont see how the z4 would work. Other motor is about done or how about ya claim me istock so i can get rid of the **** headache. the radiator is usually about a gal down after the feature is done would that still be enough to read on the temp gage to give the correct temp reading?

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 28, 2005 06:53 AM  
Where is your temp sensor in the motor? If it is in the water neck it might be in air if it is a gallon low. If it is in the head it is more than likely still in water.
You said you had your heads done did you have your block checked? If you pull the heads again use a machinest ruler and a feeler guage and check where it leaked.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 28, 2005 06:54 AM  
Your probably fine then. From up top Gustins trailer we could see you were laying down a little water. Have you had the heads off yet? It didn't look too bad in the heat race, but I'd definately try to get it fixed. It's building pressure due to a leak somewhere, so the Z-4 should seal it up and let the pressure escape. The other thing is go to a lower pressure radiator cap. Like a 18-22

istock59
Dirt Forum Champ
Total posts: 501
posted April 28, 2005 07:43 AM  
When you shut it off, the pressure built up in the cooling system will force the Z4 into the crack. Worth a shot anyhow. Not like it will hurt anything. Sounds like the motor is gonna come out anyhow...

Nah, no claim. But how bout I just give you $500 for it on the side??? LOL.


istock59
Dirt Forum Champ
Total posts: 501
posted April 28, 2005 07:45 AM  
Oh, and I don't agree with our buddy 12x...

'Cause I use a 31 lbs cap too! Over a night, I probably loose 2" worth of water in the rad. Nothing close to a gallon tho...

Nayr
Dirt Full Roller

Total posts: 34
posted April 28, 2005 10:23 AM  
I am by no means a motor guy but I had some of the same problem. I ran a 412 motor at a Missouri track and had a heck of a time with loosing water. Here goes: I went from having a real strong motor to it acting like it was just an average motor. My water level was full at the start of the night and then by the end of the night probably 1.5-2 gal low. I finally started adding water between the heat and feature. Odd deal is I never had any water in the oil. At the end of the year when we pulled the motor out there was a small crack between the lifter valleys and also a very very very small crack in a cyl. I also did a comp test on a reg base and always had good comp. Apparently when the motor was freshened they ran a hone threw it and it looked perfect. Really pulled alot of hair out over this.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 28, 2005 10:24 AM  
AHHHH alright lol... I guess that cap is fine lol....

jpotter94
Dirt Forum Racer

Total posts: 94
posted April 28, 2005 11:04 AM  
going to a lower pressure radiator cap would cause it to lose MORE water then it was cause it will take less pressure to open it then it would the 30lb cap he had in it..it is getting pressure in the system from somewhere,i have never seen a motor lose a gallon or more water and there be no problem at all.i would have the block checked..

speedy2
Dirt Full Roller

Total posts: 54
posted April 28, 2005 02:25 PM  
Thanks for the reply guys. i think ill try the Z4 (what do i have to loose) for tomorrow nite and see what happens then its coming out. Ill take it apart and let you guys know whats wrong with it.

Alltel
Dirt Maniac

Total posts: 180
posted April 28, 2005 03:55 PM  
How old is the radiator? I had one oxidize where the cap sealed. Cap was fine but there was a groove in radiator that was allowing water to bypass with no pressure and it went right out the overflow hose.

shadowsarge
Dirt Full Roller

Total posts: 60
posted April 28, 2005 06:36 PM  
Speedy2, Did you change radiators? Swapped radiators on mine and it was doing the same thing. Water coming out of the overflow when the motor wasn't even warm. Found out the filler neck on the new radiator was slightly deeper than the old one and water was getting past the seal on the radiator cap and into the overflow tube.
Just a thought....

------------------
No Guts - No Glory, STAND ON IT !!

speedy2
Dirt Full Roller

Total posts: 54
posted April 29, 2005 05:02 AM  
The water temp. gage is in the intake and the temp sensor for the light is/was in the water pump till i took it off. I didnt have the block check cuz nothen was wrong when it came out of the car. Only thing done to block was ran a ball hone thru the cylinders. Radiator is a couple years old, should get a new one anyways. Much more of this i wont have any hair left, thanks for the replys

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