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Use Radiator Stop Leak...Now Overheating??!!!! #748587
Fri May 20 2011 08:46 PM
Fri May 20 2011 08:46 PM
C
chris42pu  Offline OP
Wrench Fetcher
Joined: Mar 2002
Posts: 126
Fall Creek, Oregon
What the heck is going on here??!! I poured one of those cheap Solder Seal (now GUNK)radiator stop leakes in the leaking radiator to try and stop a few leaks...you know the kind that comes in a little pepper style canister? Now the engine wants to overheat! It ran right in the middle about 185 degrees or so before the stop leak...now it edges up to maximum. Any ideas? I hate using that stuff anyway. Grrrrrr!

BTW - Original 1942 radiator / new water pump/ 216 motor.

Last edited by chris42pu; Fri May 20 2011 08:47 PM.

Chris Simmonds
1942 Chevy 3/4 ton
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: chris42pu] #748591
Fri May 20 2011 09:03 PM
Fri May 20 2011 09:03 PM
R
rust bucket 53  Offline
Shop Shark
Joined: Sep 2005
Posts: 987
Wakefield, Massachusetts
It is possible that the sealant clogged some passages in the radiator and now you have less cubic inches of radiator leading to less space for coolant to cool. There is always a risk of that when using those products. I have only used stop leak one time and I had good results but it was a new radiator that was bumped around pretty good in an accident. Other than some mist at one seam it was in good (almost new) condition.

What do you mean by maximum? Depending on your driving conditions (climate, load, traffic, etc it might be ok. If you are driving hard in a warm climate it might not get worse. If you are tooling around town on a cool day it may be much worse it he dead of summer.

I don't know if this helps ... you could have the radiator re-cored.

Rich


1953 3/4-Ton Chevy

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If it can be built ... It can be fixed.

RB53
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: rust bucket 53] #748592
Fri May 20 2011 09:04 PM
Fri May 20 2011 09:04 PM
R
rust bucket 53  Offline
Shop Shark
Joined: Sep 2005
Posts: 987
Wakefield, Massachusetts
Might check the thermostat first to see if it is clogged


1953 3/4-Ton Chevy

In the Stovebolt Gallery
More pix

If it can be built ... It can be fixed.

RB53
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: rust bucket 53] #748594
Fri May 20 2011 09:14 PM
Fri May 20 2011 09:14 PM
C
chris42pu  Offline OP
Wrench Fetcher
Joined: Mar 2002
Posts: 126
Fall Creek, Oregon
Oh yes, forgot to mention. This engine is on a test stand, not in the vehicle. It goes from cool to way past hot fairly quickly where as before it took a while just to get up to the half way mark then would just sit there. There is NO thermostat in at this time. The engine warms up pretty fast getting warm and the radiator water is still cool. The lower hose feels warm and the upper cold and water in radiator seems cool. Worse yet, not one leak came close to stopping.

Last edited by chris42pu; Fri May 20 2011 09:16 PM.

Chris Simmonds
1942 Chevy 3/4 ton
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: chris42pu] #748595
Fri May 20 2011 09:23 PM
Fri May 20 2011 09:23 PM
W
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 8,032
Lenexa Ks.
Was the rad near full when you put it in? If the rad is low the sealer will lay on top of the tubes & plug them up.
I have used stop leaks ,mostly Bars leaks, for 60 years & never had a problem with it.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: chris42pu] #748596
Fri May 20 2011 09:29 PM
Fri May 20 2011 09:29 PM
L
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 8,490
DANVILLE IL
Originally Posted by chris42pu
There is NO thermostat in at this time.

That is the problem, not the stop leak. The thermostat acts as a flow regulator in addition to temp. Without it, the coolant is flowing too fast through the system, not allowing it dissapate the heat properly. You need to install a thermostate, or at least a 3/8" id fender washer (old Flathead trick) to act as a flow regulator.


Bill Burmeister
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: chris42pu] #748606
Fri May 20 2011 10:30 PM
Fri May 20 2011 10:30 PM
S
squeeze  Offline
Master Gabster
Joined: Jul 2001
Posts: 3,904
Vancouver Island
Originally Posted by chris42pu
Oh yes, forgot to mention. .... engine warms up pretty fast getting warm and the radiator water is still cool. The lower hose feels warm and the upper cold and water in radiator seems cool....
sounds exactly like the pump isn't pumping [rather than pumping too fast], or you added the SolderSeal when the engine was cold and low and it totally plugged the rad as George said

the lower hose should be cooler than the upper hose, and if the engine is overheating with no stat, that overhot water should be getting pushed up the top hose to the rad - everything would be equally hot, nothing "cold" or even "cool"

pull the bottom hose and see if water flows thru the rad freely - check if the pump is actually pumping

Bill


"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: squeeze] #748622
Sat May 21 2011 12:25 AM
Sat May 21 2011 12:25 AM
C
chris42pu  Offline OP
Wrench Fetcher
Joined: Mar 2002
Posts: 126
Fall Creek, Oregon
Originally Posted by squeeze
[quote=chris42pu]Oh yes, forgot to mention. .... engine warms up pretty fast getting warm and the radiator water is still cool. The lower hose feels warm and the upper cold and water in radiator seems cool....
sounds exactly like the pump isn't pumping [rather than pumping too fast], or you added the SolderSeal when the engine was cold and low and it totally plugged the rad as George said

the lower hose should be cooler than the upper hose, and if the engine is overheating with no stat, that overhot water should be getting pushed up the top hose to the rad - everything would be equally hot, nothing "cold" or even "cool"

pull the bottom hose and see if water flows thru the rad freely - check if the pump is actually pumping

Bill [/quote]

Bill,
Pulled bottom hose, both actually, and while filling the rad from the top no water at all was coming out the bottom outlet. NONE! darn stop leak. Put pressurised water through the rad and you would not believe the junk that came out. All is well now and the water flows freely out the bottom. Hopefully the radiatior will work better that before. Maybe a radiatior shop could solder the leaks on this one. Any ideas how much to re-core?


Chris Simmonds
1942 Chevy 3/4 ton
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: chris42pu] #748631
Sat May 21 2011 12:58 AM
Sat May 21 2011 12:58 AM
S
squeeze  Offline
Master Gabster
Joined: Jul 2001
Posts: 3,904
Vancouver Island
yes, some leaks can be repaired, it's not unusual for a rad with a good core to need the tanks resoldered after 50 years - hafta ask your local shop about a recore, have them test it and see if it needs one or is worth repairing .... meanwhile leave the cap loose and you'll have less leaking and less further damage .... but I wouldn't blame it on the stop leak, it has its uses and needs to be used properly

Bill


"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot
Re: Use Radiator Stop Leak...Now Overheating??!!!! [Re: squeeze] #748635
Sat May 21 2011 01:25 AM
Sat May 21 2011 01:25 AM
L
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 8,490
DANVILLE IL
I paid about $300 to have mine done, but that was with a larger core than stock.


Bill Burmeister
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