Have a JD317 with a noisy engine. I know a KT17 series 1 is a bad engine and they are known to take out rods. My question is this, What does it sound like when the rod is bad? For example does it knock or is there no warning. I've got a noise in my 317. It's loudest at idle and sounds more like a loud tick or possibly an exhaust leak rather than a knock. It's not really audible when you rev the engine up. Just wondering if anyone has heard one of these when it's about to toss it's cookies! This engine was supposedly rebuilt by a PO at one point, but I don't know what that involved. It's probably got a lot of hours on it and was used to mow a large property.