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Discussion Starter · #1 ·
Ugh.. so I trusted some mechanic to do my timing belt. It had the normal squeal on cold start from the belt, idler..

So when I pick it up it sounds normal, but as I get home. I notice I can rev it, but it makes a sound in low rpm as its decelerating. I'm going to post a youtube link for you guys in a minute.

Thing is though is still squeals! Shouldnt it not be squealing since I got it all replaced? Fml.

Hopefully someone can help. Link coming in the next few mins.
 

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Discussion Starter · #3 ·
Here.. everytime I rev it.. as it is reving down if you listen closely.. it does a little weird sound. It never did that before. It sounds almost as of I had an upgraded air intake.. but ITS NOT COMING FROM THERE!!
 

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Its probably making that sound all the time. You just cant hear it when you rev the engine. That dosent sound like timing belt to me. Did the mech replace the serpentine belt and the tensioner ?
 

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Discussion Starter · #7 ·
The thing is that, it never made that sound before the timing belt. It just rev down normally if you look at the 2nd video. Theres an extra swoosh as it decelerates like almao an intake induction sound but it's coming from the belt side.
 

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He shouldnt have had to mess with any of the induction system. I would take it back to him and explain the situation. If he's a good guy he should help you out.
 

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There is a timing belt that drives the camshaft which opens and closes valves located on the cylinder head. Timing belts have teeth, and they are carefully installed so that valves are opened and closed at the right time, which is why they are called timing belts. In my experience, timing belts do not squeal, ever. Serpentine belts, which were often called fan belts in the past, are driven by a pulley on the engine crankshaft, and they in turn drive the water pump, alternator, and other engine accessories. Serpentine belts have no teeth, and they can slip when the engine is started. When the belt slips, it can make a squealing noise. There are several causes of this slippage. The belt could be oily. There is a belt tensioner device, and this mechanism may be faulty. Bad bearings in the water pump, or the alternator, can keep a pulley from turning freely, and the belt might slip as a result. I am sure you can figure this out and get it fixed if you hang in there and keep at it. It is usually easy enough to fix a problem that makes a noise that can be heard.
 

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Best check Serpentine belt Tensioner pulley...They go bad alllll the time..

DO this - Get a Belt tool. While the engine is running, CAREFULLY remove/release the tension on the drive belt system. If it makes you feel better remove it completely and start the engine. If the noise goes away, suspect something the serpentine belt operates.
 

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Discussion Starter · #12 ·
Best check Serpentine belt Tensioner pulley...They go bad alllll the time..

DO this - Get a Belt tool. While the engine is running, CAREFULLY remove/release the tension on the drive belt system. If it makes you feel better remove it completely and start the engine. If the noise goes away, suspect something the serpentine belt operates.
So yeah I now figure the squeak is the definitely the tensioner pulley. So that's the 1st video.

Are these known for going out and causing damage? (So i can repair asap)[serpentine]

I'm only at 96.4k mi

Now. The second video does a differnt sound at deceleration. I found another video on the web random car not a volvo. It made a similar noise but more constant and louder.

Tensioner on timing belt to over tightened?

But anyway I will be taking it tomorrow morning to the mechanic I already gave him a call.
 

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Twice, we've had vehicles towed in for catastrophic failure of these...They'll lock up or, even worse, the bearing will go bad and cause the belt to walk off towards the timing belt cover. Saw one get wrapped around the crank pulley and intertwined with the Timing belt. Not trying to scare ya, but yeah it could happen..
 

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FYI. A serp belt tensioner that goes bad can cause the belt to walk off it's pully and shread the edge of the belt and when that happens, strips of the belt can wrap around the crank shaft pully which in turn can cause a catostrophic timing belt failure.
There is a guy on here that just had that same thing happen. Member on here named Tech who is a Volvo tech described the situation to the guy that it happened to. Search his recent post to find it and read about it.
 

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Discussion Starter · #15 ·
Thanks for the tips guys. Well the timing belt, Tb tensioner, tb idler, water pump, has been replaced but it still makes a weird sound at very low rpms.

Thanks for the tips.

I'm just hoping it's an over tightened tb tensioner.

Now for the belt drive system, I need to change all of it hence the squeaking. Easy job
 

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There is clearly a pulley chirping. But you also have pulleys on the serpentine belt, mainly the tensioner one.

Which brand did the garage use ? This is very important, and even more important for the water pump. If he put in a cheap one, you will have a surprise in not so long. Basically, he should not have replaced the original water pump which is good for 200k miles. Aisin only for the pump (or Volvo), Continental is the best for the belt/pulleys, or Gates. I had Dayco and the tensioner started leaking grease from day one, and the belt was cracked all over after 2 years.
 

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Discussion Starter · #17 ·
There is clearly a pulley chirping. But you also have pulleys on the serpentine belt, mainly the tensioner one.

Which brand did the garage use ? This is very important, and even more important for the water pump. If he put in a cheap one, you will have a surprise in not so long. Basically, he should not have replaced the original water pump which is good for 200k miles. Aisin only for the pump (or Volvo), Continental is the best for the belt/pulleys, or Gates. I had Dayco and the tensioner started leaking grease from day one, and the belt was cracked all over after 2 years.
Took it to a volvo specialist Sweden Volvo Repair in Glendora, Ca. He said I just need to do the serpentine as it is a pulley in the belt drive system, and coolant flush.

Btw I used INA tensioner and idler for the timing as well as continental for the belt.

I did replace the seals as well, crankshaft seal, front and rear cam seals. (Elring, corteco, and something else.)

The water pump was replaced as well, It is not aisin though.. it is a Rein pump. I got all the parts from fcp euro.
 
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