Hello, How long do you have to wait for this test? I poured oil into a cylinder and there was no apparent leak after letting it sit there overnight. The following afternoon, I noticed it went down a little. So, eventually the fuel/fluid will go past the piston rings if it sits long enough.
I think overnight is long enough to test. I had low compression in one cylinder and tested this way (with oil). The next day the low compression cylinder oil had leaked out, but not in the other cylinders. So I honed the cylinder(s), put in new rings, and tested again with no more leak downs. My machinist said to use mineral oil.
Thanks man! I had a blown head gasket or something similar (cracked/warped head, etc) and I’m planning on trying this either this way or with oil to see if the rings are still good since I have to get it registered within 30 days for insurance reasons (I’m hopefully getting my license soon and I got my policy on that car) and it would also save money to not replace them too, not just labor. Honestly as long as it runs and doesn’t slowly wear itself much worse I might just get it to pass the inspection and if problems arise or it leaks badly I’ll see about pulling the whole engine for a thorough rebuild.
All fluid will eventually leak through , thinner the fluid the easier it will go through the gaps, not a good way to check, stick to pressure test and proper cylinder leak down test.
Alfredo Rios not necessarily only if it leaks real quick but if u have play in the pistons side to side then yeah ur rings r worn and will need replacing
@@TheLightOfTheSoncompression test and leak down test if motor still in car put together otger than that need to pull rings off pistons and put rings back in block and check with feeler gauge
