What could make an engine block crack? My GMC seems to overheat fast. When I checked under the hood, I found a crack in the engine block.
An engine block could crack if the antifreeze and water mixture isn't right. This allows the coolant to freeze on one of the coolant passageways or somewhere around the block. As the coolant freezes, this will naturally expand. This expansion could lead to a crack in the engine block, as the force or pressure from the freezing coolant could be too much. To prevent this problem, stick to the recommended mixture and use the right type of coolant. Often, the recommended mix is 50% water and 50% antifreeze. This combination won't let coolant to freeze even at low temperatures. In some cases, some would use an antifreeze tester to be sure.
The electrical system of my K2500 is giving me some trouble. It would work just fine, and then all of a sudden, it would stop working, cutting power to the lights and radio. The engine would shut off as well. Then, just when I thought the electrical system has failed, it would start working again. What could be the reason for this? What parts of the car or electrical system needs to be tested or checked?
When the electrical system of the vehicle fails or won't work, you usually have to start with the battery. Check it if there's any loose connection, which could lead to the electrical system shutdown, even temporarily. The connections running from the battery to the other parts of the electrical system should be inspected. Bad battery cables and links could be the problem. Another probable cause is a busted ignition switch. There could be burnt wires. Aside from a bad battery and loose connections, you should also check the alternator. It could be wearing out, which is why it doesn't perform up to standards. If these don't lead to anywhere, let a professional mechanic or technician diagnose the problem.
I found some sludge sitting on top of the engine. Should I worry about it? Could this actually ruin the engine? I'm currently looking for some treatment for this gel-like oil deposits.
After some time, the additives in the oil will break down, along with some of the chemical compounds. If oil isn't changed regularly, oil may oxidize easily. Sludge is formed as oil deposits get baked and eventually turn into a sticky, gel-like substance. Because of the sludge, there would be less oil circulating around the engine. This means that the engine may not be properly lubricated, leading to engine failure. What's worse, the sludge may travel and coat other components, leading to blockage on some parts. And while oil helps keep the engine clean and cool, sludge does the opposite. It retains some of the heat. If sludge isn't removed or if you fail to change oil as needed, several problems may arise from this such as decreased fuel efficiency, rough acceleration, engine stalling, low oil pressure, and accelerated wear of other parts.