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Post by 1800heap on Feb 26, 2020 21:41:59 GMT
Hi David
I have had some good success with " Bar's Leaks " and no problems with rad blockage on an 1800 and a W Six.
I have also used epoxy on a Triumph cylinder head with a casting flaw which is still good today, from 25+ years ago. JB would probably work but as with standard 2 part epoxy the area needs to be very clean!
Nick
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Post by Penguin45 on Feb 27, 2020 0:11:46 GMT
Hi David. The problem with a hairline crack is that it still presents a flat surface. A two part epoxy based product relies on surface area for adhesion and even then is still sat on the surface. If a product like Barrs doesn't do the job, you would need to give the stuff something to adhere to. To be reasonably sure that it would work, you'd need to actually open the top of the crack with a triangular file typically to work the repair putty into.
As far as cleaning the area goes, a wire brush and electric drill will clean the detritus off the surface, followed by a degreasing agent and if you want to go mad with it (And you probably should...), a final scrub with IPA (Isopropyl Alcohol), acetone or the like would do the job.
E6 engines do still pop up with surprising regularity on eBay. In the UK, it's an engine with only two applications, so there is little demand and they go for little money.
The ideal solution is to have it welded. Specialist job and expensive. South Cerney Engineering have a good reputation for this kind of work.
Chris.
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Post by 1800heap on Feb 27, 2020 4:28:35 GMT
What you do will really depend on how worried you are about it. If it were me I would chuck in some Bar's following the instructions for warm up etc and keep an eye on the water level.
As for welding it may only be a temp fix depending who does it, how good they are and what caused the crack. You could be lucky and not have a problem with just Bar,s. If you are considering JB as Chris says a thin layer will not cut it. Best bet for adhesion is a sand blast. Not easy on an engine in the car! Otherwise as Chris says.
With my cylinder head the flaw was from the water side into one of exhaust ports so I was quite surprised when it was ok with epoxy. What I did was clean it up thoroughly and then used a bit of a vacuum on the water gallery's to pull the 24hr setting epoxy into the flaw. Probably that is why it worked well. You may or may not be able to do this depending on your crack and what prep you do. You also may be dealing with a vertical surface. JB will tend to run down it. Also unfortunately the crack may move a bit as the block changes temp so could be hit or miss. There is a trick to stop JB running I will try to post a photo.
Nick
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Post by 1800heap on Feb 27, 2020 4:42:10 GMT
Can you post a photo so we can see where your crack is exactly?
Nick
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Post by dave1800 on Feb 27, 2020 8:31:03 GMT
Have a look at "stitching cast iron". I recall seeing this done on one of the car rescue programmes on a very old engine block.
David
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Post by foglaursen on Feb 28, 2020 9:50:49 GMT
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