What Can You Do If You Hear A Rod Knock Sound Coming From Your Engine?

Noises coming from the engine are always troubling, but as you’re going along it can be tempting to overlook those strange sounds as look as the car is running alright. Unfortunately, these kinds of noises are often one of the first symptoms of more trouble to come and mechanical issues that could stop your car from running at all.

One kind of sound that you want to look out for is rod knocking. This sounds like someone knocking on the engine with a wrench. The noise comes from deep inside the engine, and when you press the gas the sound changes, sometimes disappearing altogether, but when the gas is let off the knocking returns and is sometimes louder. As car experts, we’ve outlined what you need to know about car knock and what you can do to take care of it below.

What Is Rod Knock

Rod knock is an issue that occurs when there’s too much movement in the mechanical components in the motor. A car engine works by moving pistons up and down because of the ignition of the spark plug. This creates a powerful enough force to make the crankshaft rotate, but between the pistons and crankshaft is a part known as a connecting rod. This is the component that is damaged when rod knock occurs.

  

The connecting rod is bolted around the crankshaft and has smooth metal bearings between the surfaces. Engine oil allows all of the metal surfaces to move without friction, but then the oil leaks or degrades it can’t prevent the friction and the bearing to get worn down. Rod knock happens when the wearing has worn thin and been destroyed, meaning the connecting rod is able to wiggle more. Amazingly, all the give that’s needed is a thousandth of an inch to cause damaging rod knock.

Unfortunately, rod knock isn’t an issue that can be ignored or that will go away with a quick fix. If it’s not addressed, it will develop into a much bigger problem. The damaged bearing will wear away entirely and when that happens connecting rod can break away and even be blown through the engine.

Fixing Rod Knock

If the problem is addressed quickly enough it could be solved with a relatively straightforward engine overhaul. In this case, the engine would be stripped down and any wear areas can be filled in with extra rings to keep it stable. Usually though it will require new engine seals, connecting rod bearings, and the engine lines to be flushed. This repair normally costs at least $2,500, with the cost going up the more parts that need to be replaced, for instance if a new connecting rod is needed.

However, in some cases the wearing will be so bad and so many parts would need to be replaced that it makes more financial sense to just replace the engine entirely. In this case, you can expect to spend upwards of $6,000 depending on the type of car you have and the area you live in. Depending on the value of the car, it sometimes makes more sense to purchase a new car altogether rather than deal with the hassle of vehicle repairs.

Now that you know a bit more about engine knock you know what to look out for and what options may be best for you.

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