When I went to change the timing belt there were 25 teeth were missing but it didn’t jump time
Had an 06 Kia spectra come in to the shop with a clicking noise coming from the timing cover started the car twice in the shop and found that the timing belt was missing some teeth did not start it again pulled the timing belt off and found 25 teeth in a row was missing and the engine had not jumped time a single tooth how is this possible
My car has 151000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Not all the teeth need to be present in order for the pulleys to turn. However, the only way to tell if the cam and crankshaft were really in the right position relative to one another is to line them up before taking the belt off and when the engine is at TDC on cylinder 1. If all the pulleys were lined up to the marks that are embossed on the engine, the only explanation is that the few remaining teeth were stout enough to turn the pulleys without breaking. However, even that doesn’t seem likely, especially since 25 missing teeth in a row would suggest that there weren’t even enough teeth for the belt to fully engage the crankshaft timing gear, thus slippage would have been inevitable. If the 2.0L engine you have has a double overhead cam, that is an interference engine (the single cam version of the 2.0L is a non-interference engine). If you’d like a professional technician check out the engine for damage, due to the failed belt, and/or install the new timing belt, consider YourMechanic.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
Misalignment is one of the main causes of timing belt drive failure. Excessive or uneven tooth wear, belt tracking and tensile failure can all be attributed to misalignment. By checking and aligning your shafts and timing pulleys you can increase the life of your timing belts and save yourself lots of downtime.
A timing belt moving positions is also known as a “jumped” timing belt. At minimum a jumped timing belt will cause a noticeable running problem and/or a Check Engine Light. In many cases a jumped timing belt will cause some engine damage. A timing belt can also strip teeth off, shred, or break entirely.
There is no easy way to correct a jumped timing belt. You will need to disassemble a portion of the engine to gain access to the belt tensioner, so you can move the belt back into position. I suggest replacing the belt and tensioners while you have it apart, so you don`t have this problem again.
Can you drive with a broken timing belt? Your car cannot run with a broken timing belt . By the time the belt snaps, the damage is already done, and you will not be able to drive at all. You will need to have the vehicle towed to an auto repair workshop.
Since the timing chain times the opening and closing of engine valves, any damage can unbalance the air-fuel ratio and result in a lack of power. It appears as a jerking motion and loss of acceleration.
If your timing belt is failing or worn out it can slip and cause the cylinders in your car`s engine to open and close out of sync. This can cause an engine misfire, which means you should replace your timing belt immediately.
The most common cause of this alignment is worn bearings, which could either be in idler pulleys or components driven by the belt. The worn bearings can cause the pulley to be cocked to one side. The second most common cause is a worn tensioner.
Usually, when a timing belt fails, it happens very suddenly. Once a failure occurs the engine will immediately stop or lose significant power. If your vehicle has a chain instead, though, it may make a lot of noise if it is loose. If this chain breaks, you will often hear the crack.
A worn timing belt will affect your engine`s starting speed as it is attached to the pulleys that drive the crankshaft. Eventually, the belt can slip on the camshaft drive causing the engine cylinder to open and close at the wrong time.
Time is perhaps more important than miles. Seven years is the maximum life of the timing belt recommended by most manufacturers. For example, the belt should be replaced even if the engine has only 30,000 miles but is seven years of age. More timing belts break due to age than mileage.
– Belts A belt slipping around a pulley reduces the efficiency of the components it drives. A worn, defective, or incorrectly tensioned belt can lead to battery failure and engine overheating.
Most stock street engines call for 6 to 8 degrees of initial advance, but this is not set in stone. Engines with longer duration camshafts and other modifications often demand more initial timing. It`s not unusual to input 14 to perhaps 18 degrees of initial timing for engines with big cams.
There is a rattling sound. A lax timing chain, or worse, a broken timing chain with loose parts within the engine, will produce a rattling sound when your car is idling. This rattling sound is typically most prominent while the engine heats up and disappears after some time.
If the chain isn`t operating at the correct tension, there`ll be a knock-on effect on the engine performance. This can manifest in misfires, problems starting the car, its performance could feel sluggish or run low on power.
A worn timing belt/chain that has “jumped-a-tooth,” knocking spark timing out of sync, will cause reduced power and acceleration problems. Timing belt repairs should be left to your mechanic. A car not accelerating properly when you step on the gas pedal should be professionally checked and repaired immediately.
When the belt breaks, the valve springs will slam all the valves closed. From sheer inertia – no matter how fast you were going or even idling – the crankshaft will continue to move the pistons up and down for a short time and will hit the valves.
When pulleys wear out, they often struggle to maintain tension on the belt. As a result, the belt can come loose and knock against other components, causing a slapping-like noise. In most cases, this is an indication that you will need a new pulley, and perhaps even a new belt, depending on the damage caused.
No timing belt will give an increase in performance – it`s just not possible. Its main job is to keep the timing in check. Having your timing belt replaced and noticing an increase in performance is just a mix of the engine operating at peak efficiency and a good hit of placebo effect thrown in for good measure!
When pulleys wear out, they often struggle to maintain tension on the belt. As a result, the belt can come loose and knock against other components, causing a slapping-like noise. In most cases, this is an indication that you will need a new pulley, and perhaps even a new belt, depending on the damage caused.
Misfiring Engine
Since the timing chain times the opening and closing of engine valves, any damage can unbalance the air-fuel ratio and result in a lack of power. It appears as a jerking motion and loss of acceleration.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
When I went to change the timing belt there were 25 teeth were missing but it didn’t jump time – how is this possible?
ANSWER : Not all the teeth need to be present in order for the pulleys to turn. However, the only way to tell if the cam and crankshaft were really in the right position relative to one another is to line them up before taking the belt off and when the engine is at TDC on cylinder 1. If all the pulleys were lined up to the marks that are embossed on the engine, the only explanation is that the few remaining teeth were stout enough to turn the pulleys without breaking. However, even that doesn’t seem likely, especially since 25 missing teeth in a row would suggest that there weren’t even enough teeth for the belt to fully engage the crankshaft timing gear, thus slippage would have been inevitable. If the 2.0L engine you have has a double overhead cam, that is an interference engine (the single cam version of the 2.0L is a non-interference engine). If you’d like a professional technician check out the engine for damage, due to the failed belt, and/or install the new timing belt, consider YourMechanic.
Timing belt is tight and yet appears to be slipping several teeth when belt is rotated,
ANSWER : This is okay since there are more notches on the belt than the amount on the sprockets. Once you aligned the first time the belt marks will almost never line up perfectly again. The marks are used to put the belt on correctly. They aren’t used as an indicator after the engine is turned again. You should be okay to start the motor as long as timing marks on pulleys line up. If you run into any issues, have a certified technician, like one from YourMechanic, assist you with the replacement of the timing belt.
Hi I have a 2004 2.4L automatic Hyundai Sonata. I change the timing belt as it has chewed teeth. I also change the headgasket and
ANSWER : Hi there. Since you completed so many different repairs, it unfortunately opens the door to multiple possible issues that might be the source of your hard to start issue. The first thing I would do is knock off the easy checks; by verifying that all electrical connections, fuel and / or vacuum lines are correctly attached. If everything checks out there, I would either replace the wiring harness to the crankshaft position sensor or check the output from the PCM. Most of the time when crankshaft position sensor issues exist, it’s the wiring harness itself that is faulty. Try those steps and if you still need a hand diagnosing your problem, feel free to contact one of our mobile mechanics and they can come to your location and complete a car is hard to start inspection.
Can you change the defected water pump without changing its defected belt (which is the drive belt and only belt in this model of
ANSWER : Hello. Yes you can replace the water pump without replacing the serpentine belt. If the belt is worn, and it breaks while you are driving, you can damage a lot of other components in that area. Typically the price of a serpentine belt is relatively inexpensive. You will have to remove the belt to replace the water pump anyway. Since you are likely going to have to purchase a new pump, we do recommend that you purchase a belt at the same time. You SHOULD replace the belt if it is worn, and this is a perfect time to do it. It is not necessarily required, but you are putting yourself at risk of another break down at a later time. Not to mention if the belt is already worn, manipulating off and back onto the vehicle while changing the water pump can further damage it, and shorten the amount of time its got left. Belts should be replaced before they break, as to the amount of damage they can cause when they do break. Again, you may be able to get away with not replacing the belt right now, but if its as worn as you say, its going to break sooner than later and should be replaced.
1992 Acura Legend, when the timing belt goes, is it common for the valves to bend?
ANSWER : If the timing belt break off, the engine’s pistons will hit the valves as the pistons are moving. The engine is an interference engine and can cause damage to the internals of the engine. The last time the belt came off, the engine may have been running at an idle or not under power. It is possible for the valves to be bent. What I recommend doing is performing a leak down test on the engine with a timing belt on the engine and properly timed to determine if the valves were in fact bent. If all of the cylinders have a 80 percent hold and not leaking, then the engine is fine. If there is a mass leak on a cylinder, then the piston did some internal damage. I recommend seeking out a professional, such as one from Your Mechanic, to help you check your engine’s valve train with a leak down tester.
______________________________________________________
Billing and parts question was sent to CS for the cost of parts and labor for valve train and related parts from a broken timing belt for a 1992 Acura Legend with a V6-3.2L engine.
Alternator belt noise when running the air conditioning
ANSWER : Hello. Noise signifies a problem. The problem could be a worn belt but the noise could also be due to a faulty tensioner, misaligned pulleys, or glazing on the belt which by the way in certain configurations will result in the accessory drives running below intended speed due to belt slippage.
It’s hard to say what effect WD-40 might have had in possibly masking these other problems, if they exist, and the reality is you can’t keep spraying the belt. In essence, the mechanic is suggesting that the diagnosis be put off for six months to a year (10,000 miles). That is you won’t know for sure if it is just the belt "alone" and not a weak tensioner or a pulley issue for some time to come.
Generally, unperformed maintenance and failure to perform repairs that are needed brings one on to the proverbial slippery slope. It is better to just repair it now if it is a known issue than to wait and wonder. If it were me, I would just fix it now.
If you’d like a fresh pair of eyes on the situation, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the sound you’re hearing for an accurate repair.
Timing belt stripped teeth,I changed the belt, pullyes and water pump now it doesn’t fire
ANSWER : Since the timing belt stripped off the teeth of the belt then the camshaft and crankshaft got out of time and this is an interference engine. This means that you most likely bent the valves when the timing belt teeth broke. You will need to remove the cylinder to repair the head and bent valves and then install a new timing belt.
How does a mechanic know the timing belt is broken
ANSWER : Hello. I would need to know the specific engine to be sure, but since Honda does use interference type engines, it may be possible that damage has occurred if the timing belt has broken. Interference type engines use very tight valve to piston clearances. This yields increased engine performance, however, leaves the engine susceptible to contact and damage if the timing belt breaks. Checking to see if the belt is broken should be a simple matter of removing the timing covers to check the condition of the belt. While not common, it is still possible that the belt broke, even if it did not yet reach the recommended mileage. I would check the the belt to see if it has broken and go from there. If you need help with a timing belt repair, a certified professional from YourMechanic can go to your home or office to perform this service.
