The worst symptom you can experience is having the timing belt cut off or broken completely. The only way to recover from this is to rebuild the entire motor. This will cause the engine to fail altogether. Some of these pieces might fall into the vehicle’s oil pan, resulting in the oil pressure to drop in the bottom of the engine. If the timing of the belt is off, it can skip and break off pieces of the camshaft. The timing belt spins the gears of the camshaft. The result will be lots of smoke coming out of your exhaust system. If you have a worn-out timing belt then this will become unsynchronized, which means that exhaust will be let out and air will be let in at inappropriate times. The opening and closing of these holes are synchronized with how the cylinders move and how the camshaft rotates. The top of every cylinder has two holes which are responsible for letting out the exhaust and letting in air. But if you see too much smoke that looks unusual even for the winter, then it might have to do with a timing belt problem. If it is wintertime and cold outside, it may be hard to tell if the vast amounts of smoke coming from your tailpipe are actually harmless steam or water vapor. If you don’t replace the belt soon, the engine could be permanently damaged. If that happens, an engine misfire could occur which means the belt needs to be replaced right away. If the timing belt were to slip away from the gears and fall onto the camshaft, one of the cylinders will open and close too soon. The fire rate of the engine could be jeopardized from the timing belt being worn out. Worst of all, the engine will begin to stall because the camshaft timing is off. Once this happens, the teeth will fall directly onto the gears and form a jolt in the engine. If these teeth ever start falling off or become brittle, the timing belt will start to slip away from the gears. There are teeth on timing belts which grip gears as they’re rotating various engine parts and components. See Also: Code P0017 (Engine Timing Issue) #1 – Rough Idling of the Engine Once you experience one or more of these symptoms, have a certified auto technician or mechanic inspect the timing belt and then replace it if necessary. If you have a bad or worn out timing belt, the following are symptoms that may occur. Related: SOHC vs DOHC (What’s the Difference?) Symptoms of a Bad Timing Belt Overall, the timing belt makes sure the engine performs the best that it can by controlling the timing of the crankshaft and camshaft. As for the camshaft, it is responsible for opening and closing the valves. That takes us straight to stronger oil as a fix.The timing belt links the camshaft to the crankshaft, which manages the pistons of the engine. I think one problem is that oil is not getting pushed into the chain and it breaks down under the repeated stress of passing through that gear. Looking at my photo of worn components, you'll see the chain is now a "thicker" design as compared to the motorcycle type chains on the original version of this engine. Clearly that is the highest stress point for oil in this engine. Looking at the engine photos above you will note the designers have three oil jets aimed at the crank gear. The Land Rover engines we see are mostly clean inside, even with clear chain/guide failure. On those engines we often saw chain wear in engines where there was extensive sludge buildup, which suggests the driver used "economy" oil in place of the recommended oil, and didn't change it often enough. Readers of my columns may note that I've written about timing chain issues on other car lines, such as Mercedes. Hence our advice to change oil at 7,500 miles, though that number is somewhat arbitrary and cautious owners might prefer a 5 or 6k interval. Metal-on-metal wear is the cause of chain wear and failure. If we assume (or hope!) that the JLR specified oil is strong enough to prevent this when new, we might expect better protection if we change it earlier.
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