I suppose it could be that I’m hypersensitive to noises now that some work has been done. However, today I noticed that the car was knocking (almost sounds what I think of as a Model T) when idling. So I brought it back, he replaced it and all seemed well. The mechanic who did the work said the initial tensioner was leaking oil, and thus not applying the correct tension to the belt, which in turn was making the engine sound as if it was whirring while driving. I recently installed a starter motor and a knocking noise appeared afterward. It’s frustrating, but don’t feel too bad. There’s a possiblility the new water pump could be faulty too. Early or late valve timing would likely cause a knocking noise too. It has to be put on exactly as spec’d, the alignment marks have to be aligned correctly simultaneously on the crankshaft and camshaft, otherwise the valve timing will be early or late. If an engine mount isn’t put back on correctly or tightly enough, that could cause a noise, especially on acceleration I expect. That has to be done very carefully in order not to break something. I can’t say what is involved on your car as I’ve never done one on that make, but installing a timing belt on a Toyota Corolla (which I have done) involves removing the front engine mount, loosing the mid-engine mounts, and jacking up the engine and is a fairly invasive procedure. That indicates to me the timing belt installation may have not been done correctly, but without more info it is hard to say. It’s unusual that a tensioner would be defective after the work you had done. If they are ok, proceed to dig deeper to troubleshoot the timing belt tensioner.Like others say, we need to know more about the recent history. Also, if they are failing, they generally do not cause stumbling or hard starting. So if you have doubts about where the noise is coming from, take steps to rule them out first. They are both relatively easy to inspect, and simple and inexpensive to replace. Both of these can also make the same noises as a timing belt tensioner. Keep in mind that the serpentine belt also has a tensioner, and also sometimes and idler pulley. When the engine is idling, listen for the following noises from the timing cover area: For example, the pulley may not be rotating freely. Or you may hear timing belt tensioner noise. When the timing belt isn’t tight enough, it starts making noise. Even if you manage to start the engine, expect the engine to misfire or run rough. This leads to hard starting It may take a while for the engine to fire up properly. When there are timing belt tensioner issues, the valve timing is slightly off. Lack of perfect timing leads to acceleration issues. Look for the following signs of timing belt tensioner failure: Acceleration Issues The crankshaft and camshaft will come out of perfect time for a moment or two. Instead, when the throttle is abruptly opened the tensioner can’t keep the right tension on the timing belt. One thing to keep in mind is that when the tensioner begins to fail, the timing belt, which has teeth, doesn’t actually slip. There are several different ways to detect timing belt tensioner failure simply by driving the vehicle. If the timing belt tensioner is leaking, it will lose the tension it needs to keep the timing belt tight. It uses hydraulic oil to maintain the tension. Hydraulic oil leak: A hydraulic timing belt tensioner assembly works like a small shock absorber.It may cause the timing belt to slip off. Dirt and dust build-up on the timing belt tensioner pulley: When this happens, the pulley will fail to support the timing belt.As a result, the entire tensioner becomes too weak. Over time, the spring stretches out and loses its tension. Wear and tear: On a new mechanical timing belt tensioner system, the timing belt tensioner spring is wound tightly by two tension rods.The most common causes of timing belt tensioner failure include: So if any suspicion arises that the timing belt tensioner has failed, it’s important to check the tensioner and replace it if necessary. As a result, the timing belt becomes loose and the valve timing can be thrown off. When a timing belt tensioner fails, it loses tension. Usually, the tensioner is replaced along with the timing belt. Some timing belt tensioners last a long time.
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