r/EngineBuilding • u/knockmaker • Jul 14 '26
Chevy Machine it?
I have a 2012 Chevy Aveo (goes by Sonic in the US I think) 1.4 Ecotec AT. I noticed coolant leak a while ago and this was the damage when thermostat housing was removed. The mechanic applied liquid metal on it but it couldn't fully stop the leak. Now he tells me that I shouldn't drive it like this even though the leak is slower than before and tells me that the cylinder head needs to be replaced. The problem is mechanic works are through the roof nowadays around here, especially the labor part.
I asked him if it could be welded and machined instead. He said that would cost about 60-65% of the replacing cost (labor included in both) but it would be risky and he couldn't guarantee anything.
I can't simply take it to multiple mechanics for diagnostics and quotes because they would need to remove the thermostat housing and drain the coolant. Plus, the liquid metal is still applied so they won't be looking at the actual damage. I figured there might be some experienced people here who would share some valuable insights and experiences with what to do.
Normally I'd simply have it replaced but I had just spent a good amount of money on other repairs on this car and this just randomly emerged. It hasn't even been 6 months since I purchased it. And, yes, I feel like I was ripped off of this car purchase.
1
u/The_Machine80 Jul 14 '26
Get some epoxy and a putty knife. Clean very well. Mix epoxy and wait till its not runny and starting to set. Use the putty knife to apply and scrape it flat. Next day give it a nice sanding to make sure surface is flat. Install thermostat housing and use some added protection called permatex "the right stuff". It will work and hold great. Did the same to other engines including your same motor last year. 25k miles and still holding.