I contracted to build an engine for a fellow, but just as the parts arrived, he called me, said I "was taking too long", he would assemble it, and was on his way over to pick up the parts. This guy had always been a PITA, so I did not even try to talk him out of it. So he pays for his parts (with a bad check, but that's another story) and is gone. I didn't hear anything for a couple of weeks, then he calls me and inquires about the "warranty". I said while there was no official warranty per se, I had always stood behind my own labor, but since I didn't do anything to his engine except machine the block and order parts, he was S.O.L. Then he proceeded to tell me the engine was junk, wanted his money back, was going to sue me, etc, etc. I have found that when there is litigation involved, it is always best to perform the initial autopsy, rather than have to defend oneself from incompetent failure analysts at a later date. So just B.S'ing him a little, I "offered" to determine the cause of the failure, and if my parts were at fault, I would "make good". I knew they weren't.
I found that every bearing in the engine was completely burned out/spun, with heat signatures everywhere. I knew the clearances were correct, and since the engine had failed shortly after start-up, what happened? As soon as I removed a main bearing from a cap, it became obvious. This guy had LOCTITED the bearings in place! Every one of them! After we all shared a good laugh, I called him up, told him I had it figured out, come on over and we'll discuss. I guess he thought I was going to write him a check, 'cause he showed up very quickly. I made sure my shop helper was present at the discussion when I inquired about the "stuff behind the bearigs". He readily admitted it was red Loctite(seemed rather proud of his idea, actually). As soon as he did that, I explained to him that his actions were the cause of his troubles, that our business was done, he could remove his parts and himself from the premises immediately, and he was welcome to sue me if he cared to. Funny thing, I never did hear from him again, and when I saw Loctite(his instant new nickname) at the track a few months later, he acted like we were old friends.