pinprick airleak in barrel wall

[Psychedelicropcircle]

how do you go about fixing this? This started out life as a 186 imola, I managed to kill it so bad it was bored out to a 195 ceramic lined & im building this only to find an airleak in the barrel wall! bought in 2010 so I doubt it was here before its rebore! bad casting?

[missing lynx]

Shouldn't the ceramic coating be air tight?

[missing lynx]

Looking at it isn't it where the transfer ports are?

[Knowledge]

Yes, that is on the transfer wall: the ceramic treatment would not have touched it.

I would just put some Araldite over it. My barrel is full of such fixes.

[sunrisemac]

we use a company Ultraseal based in Slough to seal our ally cylinder heads and anything else that has porosity that would cause a problem.

http://ultrasealslough.co.uk/

[Scooterdude]

You can buy low temperature alloy “welding rods” that melt using a regular blow torch that would be my choice for repair.

[dickie]

You can buy low temperature alloy “welding rods” that melt using a regular blow torch that would be my choice for repair.

Maybe I bought poor quality ones, but mine just crumbled rather than melt.

[Warkton Tornado No.1]

Blimey!

If it's transfer wall, why not just drill the hole bigger, tap to something like M3 & Loctite a good screw in place? I'd use A4 stainless & finish both sides flush for an almost invinsible repair.

[Knowledge]

You can buy low temperature alloy “welding rods” that melt using a regular blow torch that would be my choice for repair.

Maybe I bought poor quality ones, but mine just crumbled rather than melt.

Have noticed that when they show people using that low temp Ali welding rod, they are welding Coke cans, not big lumps of Ali, like an engine barrel? You just can’t get enough heat into the barrel to get the process to work, especially as the barrel is purposely designed to disperse heat.

These rods have their place, but not here.

[Fast n Furious]

+1

[Scooterdude]

You can buy low temperature alloy “welding rods” that melt using a regular blow torch that would be my choice for repair.

Maybe I bought poor quality ones, but mine just crumbled rather than melt.

Have noticed that when they show people using that low temp Ali welding rod, they are welding Coke cans, not big lumps of Ali, like an engine barrel? You just can’t get enough heat into the barrel to get the process to work, especially as the barrel is purposely designed to disperse heat.

These rods have their place, but not here.

Well rather than speculate would it not be a better idea to buy a single rod (as i did) and give it a try? If it works well fantastic, if it doesn’t well get someone to weld it properly with a tig.

Remember the low temp rods are not anything to do with welding, their more like a form of brazing so in this case should flow into any porosity that’s present.

[dscscotty]

JB Weld it, done loads, this is more common than you think, but good chemical metal, such as JB weld will sort it,

[Psychedelicropcircle]

Thanks for input lads, I’ll give the JB weld a go, stripped out the reed block twice thought I was going mad! Wasn’t until I located a breeze whilst trying to locate the hiss

[dscscotty]

JB Weld sorted this out!

[holty]

yes ive had one the same, remove cylinder and mark the hole in the transfer port in the inside and then clean with solvent then use some jb weld to seal the hole, problem solved

[tonytoolbox]

had the same on my imola tiny casting hole in the transfer ,used yambond , 5 euro's done and still all good

[Adam_Winstone]

Good timing as I need to do the same on my current build.

Question please: Which of the various JB Weld products are people using? The common 2 tube epoxy or the different high temp putty product?

Thanks in advance as knowing may stop me from trying the wrong stuff.

Cheers

Adam

[dscscotty]

I used just the standard tube stuff,
https://www.ebay.co.uk/p/24033516626?ii ... gIIUvD_BwE

[Bilko]

I had one on my RT. The 2 tube version is what I used.

[Adam_Winstone]

Thanks for the replies guys. Ordered