'86 toyota 22 re engine losing coolant. no visible leaks. Dye and pressure test

[teahouse]

negative. What's wrong? Engine has 40K miles. Runs smooth. No overheating unless low on coolant. No steamy exhaust. No coolant in oil or oil in radiator. Soooo, what's going on??

[Mark]

Classic problem of quite possibly the best engine ever made. There is a plate behind the timing chain that the timing chain can rub on and actually wear through. It's most likely in a pickup; if so easy fix. Don't wait or you cook the engine.