Following along the lines of the easiest/quickest thread below, what was the quick, easy repair that turned into a disaster? I’ve had a few, like proactively changing all the heater hoses because of age and tugging a little too hard, resulting in a 5 hour heater core replacement. A quick serpentine belt change when the wrench slipped and broke the A/C service port on the accumulator resulting in immediate discharge of the refrigerant.
Two others come to mind that came to me for repair.
Toyota Camry V6, died while turning into a steep driveway. I ended up telling him his axle shaft was the reason the engine wouldn’t start. It seems he had his “buddy” replace his noisy CV shaft a few days earlier. On this car, the right shaft is a 2-piece design, held to the block by a carrier bearing. The shaft is held in the carrier through the use of a large snap-ring. Buddy didn’t install the snap ring properly, and the suspension travel into the driveway pulled the cv shaft out, where it swung around and broke off the hydraulic timing belt tensioner that protrudes from the bottom of the engine, resulting in timing belt jumping. Another CV shaft, complete timing belt kit with tensioner, on the road again.
Buick Park Avenue Ultra, 3.8 Supercharged. This engine has 2 serpentine belts, one solely to run the engine supercharger. Customer was advised of a noisy belt tensioner, but decided to wait on the repair until the noise got worse. Car was towed in, seems the noise stopped and suddenly a new noise appeared, the car wouldn’t steer properly and the engine light was on. The noisy tensioner pulley finally seized, the belt started slipping until it broke and came flying off. As it was doing so it flailed around enough that it tore the rear O2 sensor wiring to pieces, shorting the sensor heater feed to ground. The belt also wrapped around and tore open a CV boot slinging grease everywhere. But there’s more…the belt that wrapped around the axle also somehow lassoed itself around the inner tie-rod, and the turning CV shaft tightened up the belt. You’d think the belt would just snap, but instead it tightened up enough that it broke the rack and pinion off of the subframe. So this turned into a replacement rack and pinion (adding a core charge for a broken rack), CV shaft, oxygen sensor, wiring repair, belt and tensioner. I don’t think this guy was happy that he put off his $100 tensioner repair.