Block sealer

Jdubwikk

Jdubwikk

Junior Member
I am curious if anyone has had a block that showed signs of weeping and what type of block sealer you have used. I bought blue devil but after asking the company rep some questions they recommended not using it because the coolant system is not pressurized. Comments?
 
Where is it showing signs of weeping? Yea the miracle in the bottle stuff usually needs a bit of pressure to force it into the crack. reacts with oxygen and "clogs" the crack.

Alot of people JB weld it from the outside and or have it professionally welded up. (cast iron is tricky but doable)
 
My '31 has a pesky weep at the passenger side front corner of the head block seam. I did the white vinegar treatment and used a commercially available block sealer that has sodium silicate as a prime ingredient. I just refilled with distilled water and a bottle of Water Wetter. The cooling system is pressurized. The theory is that SS hardens to seal leaks when it is exposed to air.
I will report the result.
 
md8810 said:
My '31 has a pesky weep at the passenger side front corner of the head block seam. I did the white vinegar treatment and used a commercially available block sealer that has sodium silicate as a prime ingredient. I just refilled with distilled water and a bottle of Water Wetter. The cooling system is pressurized. The theory is that SS hardens to seal leaks when it is exposed to air.
I will report the result.
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Is it cracked or is it boogered up from someone jamming a prybar in there to remove the head?
 
My head gasket weeps only over the winter when she sit for a long time , is it true most headgaskets weep a little
 
jm29henry said:
My head gasket weeps only over the winter when she sit for a long time , is it true most headgaskets weep a little
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I think so because most gaskets don't have the coolant holes wrapped with the metal, like the fire ring. Some guys have brushed sealant over the exposed coolant holes edge.
 
jm29henry said:
My head gasket weeps only over the winter when she sit for a long time , is it true most headgaskets weep a little
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Two things;
Are you saying that you keep water/coolant in the cooling system throughout winter while car is not driven ? Why encourage rust/corrosion, why not drain system ?
IMO, most headgaskets that 'weap a little' comes from mating surfaces not being flat/cleaned and sealed properly when head gasket was installed.
 
It is capillary action through the filler material that is a nuisance. How many gaskets do you think have been replaced trying to stop this normal action? If you decide to replace do as Tom suggests and seal before you place the new gasket. I would just add Aluma-seal or water glass and be happy. It won't clog the radiator
 
Kahuna, thanks, that is the product I used. I discarded the container and did not want to guess the name.
Next week after our forecast SoCal rains, I will have an update.
 
Sea slugs,
There seems to be numerous reasons for the common weeping problem. This car is rather new to me so we will see if this fixes this minor weep. To your question, I don't know the reason but it is so minor that a pesky weep is a good description.
 
hardtimes said:
Two things;
Are you saying that you keep water/coolant in the cooling system throughout winter while car is not driven ? Why encourage rust/corrosion, why not drain system ?


I've always thought that keeping water and anti corrosion elements in the system all the time, actually is less likely to cause rust, then draining and leaving a wet place for oxygen to create rust.
Anyone have some information on which is better?
Click to expand...
 
By all means keep 50% antifreeze in the system all year. An empty system will rust.

I've never tried the water and oil mix because that doesn't prevent freezing.
 
I've wondered why not a heat transfer substance that would not freeze, would not cause rusting, would not steam! Lite weight oil like automatic trans fluid?
 
Does oil give up its heat as quick as water? Does it absorb as much heat as water? Im just thinking out loud as i dont know the effectiveness of the radiator if it had oil in it or its ability to quickly absorb the engine block heat in the first place...
 
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