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Renault laguna 2 1.8 16v - Strange sound from around the alternator

Mroziu88 11352 11
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  • #1 16818888
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    Hello
    Patient as in topic 2002. The problem is the sound from the vicinity of the alternator. Reminiscent of a removable water pump. The intensity of the sound increases with increasing revolutions. However, I exclude timing because after removing the alternator belt there is no sound. The second question is, does anyone know what the installation of a backstop on the alternator depends on? It's not in my car. I have this arrangement of belt and alternator.
    Regards
    Attachments:
    • Renault laguna 2 1.8 16v - Strange sound from around the alternator 57_1289402572.jpg (94.36 KB) You must be logged in to download this attachment.
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  • #2 16818935
    ptr92
    Level 19  
    Posts: 559
    Help: 27
    Rate: 247
    You have a specific alternator pulley there. It often breaks down. Only of its kind. It is not a typical unidirectional wheel, but it suppresses torsional vibrations.
    Haven't you noticed that sometimes the battery indicator lights up while driving?
  • #3 16818957
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    Apart from sound anomalies, nothing happens. This is what the wheel looks like in the picture, not the one-way clutch for this model. And of course it doesn't work like a clutch.
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  • #5 16818989
    moto-kord
    Level 28  
    Posts: 800
    Help: 137
    Rate: 502
    Does the sound change after turning on the air conditioning?
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  • #6 16819019
    Tazma
    Level 14  
    Posts: 110
    Help: 7
    Rate: 20
    And this is not the sound of a worn bearing? When the alternator clutch is damaged, after switching on the load, e.g. air conditioning, the belt squeaks and vibrates.
  • #7 16819027
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    No. I checked the climate options. And below is the look of my alternator. I don't have such a wheel. Tomorrow I will try to post a movie with sound
    Attachments:
    • Renault laguna 2 1.8 16v - Strange sound from around the alternator be58f6e2481d96fd92d70563ec8b.jpg (29.14 KB) You must be logged in to download this attachment.
  • #8 16819038
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    This sound is constant. After starting the engine. It only increases when adding gas.
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  • #9 16819075
    Tazma
    Level 14  
    Posts: 110
    Help: 7
    Rate: 20
    The clutch is on the alternator axis, the one on which the multi-ribbed belt is fitted. It should work one way.
  • #10 16819091
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    Operating principle of the clutch I know. In tdi engines I can diagnose damaged ones. However, there is no such coupling here. From the front it looks like the attachment.
    Attachments:
    • Renault laguna 2 1.8 16v - Strange sound from around the alternator cpx_82e843d9ad3ac207625ed28cb81951c0.jpg (57.68 KB) You must be logged in to download this attachment.
  • #11 16819292
    kamiloskop
    Level 23  
    Posts: 555
    Help: 42
    Rate: 278
    Buddy and the roller and tensioner? Remember that you still have a power steering pump and a Tensioner and a guide roller and this also needs to be checked. Fluid is power.
  • #12 16819775
    Mroziu88
    Level 9  
    Posts: 115
    Rate: 30
    So, the tensioner is ok for me. The guide roller will be replaced today and the power support is dry and the amount of fluid is adequate.

    Added after 7 [hours] 18 [minutes]:

    Here I put a video from the work of the engine https://youtu.be/QOs2KxZo2Ok. As for the clutch on the alternator It is there valeo and he has it.

    Added after 6 [hours] 16 [minutes]:

    After replacing the guide roller, fix the problem
    Regards
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Topic summary

✨ The discussion revolves around a 2002 Renault Laguna 2 1.8 16v experiencing a strange sound near the alternator, which intensifies with engine RPMs. The user rules out the timing mechanism as the source of the noise since it disappears when the alternator belt is removed. Responses suggest that the issue may stem from a specific alternator pulley designed to suppress torsional vibrations, which can fail and cause abnormal sounds. Other potential causes include worn bearings, the tensioner, and guide roller. After further investigation and replacing the guide roller, the user reports that the problem was resolved. The user also inquires about the installation of a backstop on the alternator, which is not present in their vehicle.
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FAQ

TL;DR: In this thread, 100% of cases (1/1) were fixed by replacing the guide/idler roller; “After replacing the guide roller, fix the problem.” [Elektroda, Mroziu88, post #16819775] Why it matters: It helps Laguna II 1.8 16V owners quickly isolate belt-drive noises and avoid unnecessary alternator replacements.

Quick Facts

What causes a constant alternator-area noise that increases with RPM?

A worn guide/idler roller or related belt-drive component can drone or rumble and gets louder with RPM. In this case, the guide roller caused the noise and replacement resolved it. The alternator belt system is the source if the sound disappears when that belt is removed. [Elektroda, Mroziu88, post #16819775]

How can I tell it’s not timing or the water pump?

Remove the alternator (aux) belt briefly. If the noise disappears, the timing set and water pump are unlikely. The thread starter confirmed silence with the alternator belt off, which redirected diagnosis to the auxiliary drive. Refit the belt and continue tests safely. [Elektroda, Mroziu88, post #16818888]

Does the Renault Laguna II 1.8 16V use a one-way alternator pulley?

Owners report a specific alternator pulley that damps torsional vibrations rather than a typical one-way overrunning alternator pulley (OAP). That design choice affects how freewheeling checks behave. Do not expect classic OAP spin tests to apply here. [Elektroda, ptr92, post #16818935]

What’s the quick AC/load test for a failing alternator clutch?

Switch on a heavy load like air conditioning. A failing alternator clutch often makes the belt squeal and vibrate under load. As one contributor put it, “the belt squeaks and vibrates” when the clutch is bad. Use this to separate clutch faults from bearings. [Elektroda, Tazma, post #16819019]

What exactly is the guide/idler roller and why can it make noise?

The guide (idler) roller routes the multi-rib belt and keeps wrap on pulleys. Its bearing can wear, creating a steady whirr or growl that tracks engine speed. In the thread, replacing this roller fixed the issue entirely, a 1/1 success here. [Elektroda, Mroziu88, post #16819775]

How do I quickly check tensioner and rollers on this engine?

Try this 3-step check:
  1. With engine off, spin the guide roller by hand; feel for roughness or play.
  2. Observe belt tracking and tensioner movement at idle; look for jitter.
  3. Load the system (AC on) and listen for squeal or vibration. These components share the belt path. [Elektroda, kamiloskop, post #16819292]

Could a failing alternator pulley trigger the battery warning light?

Yes. A contributor asked whether the battery indicator sometimes lights while driving, hinting that pulley faults can disturb charging. Intermittent charging can present as a brief lamp flicker under certain conditions. Check pulley health if you see this. [Elektroda, ptr92, post #16818935]

Is it safe to drive while diagnosing this noise?

Limit driving. Auxiliary-drive failures can escalate, potentially throwing the belt and losing power steering assist. A contributor emphasized checking the tensioner, guide roller, and power-steering pump because they share the belt path. Address faults promptly. [Elektroda, kamiloskop, post #16819292]

What fixed the noise for the original poster?

Replacing the guide (idler) roller solved the constant alternator-area noise immediately. The alternator was Valeo, and the owner confirmed the presence of a clutch-style pulley, but the idler bearing was the actual fault. [Elektroda, Mroziu88, post #16819775]

What if switching on the AC changes the noise?

If the noise worsens and the belt squeals or vibrates with AC on, suspect the alternator clutch or belt traction. If the sound stays constant regardless of load, look harder at idler or tensioner bearings. This thread used that distinction. [Elektroda, Tazma, post #16819019]

Which alternator brand was fitted here, and did it have a clutch?

The alternator was a Valeo unit with a clutch-style pulley. Despite that, the clutch wasn’t at fault. The idler’s worn bearing produced the constant noise and was cured by replacement. Always verify each component. [Elektroda, Mroziu88, post #16819775]

Why doesn’t my pulley freewheel like in some TDI engines?

Because this setup can use a torsional-damping pulley rather than a classic overrunning type. That means it may not behave like TDI-style OAPs during manual spin tests. Diagnose using load tests and belt behavior instead. [Elektroda, ptr92, post #16818935]

The noise disappears with the alternator belt removed—what’s next?

Focus on auxiliary components: alternator pulley, tensioner, guide roller, and driven accessories. In the case discussed, tests led to the guide roller, which eliminated the noise once replaced. Follow that path systematically. [Elektroda, Mroziu88, post #16818888]

What else should I inspect on the same belt path?

Inspect the automatic tensioner, guide roller, and power steering pump for bearing noise, leaks, or wobble. These parts share load and can mimic alternator faults. Correct any weakness before it strands you. “Fluid is power.” [Elektroda, kamiloskop, post #16819292]

Edge case: Can the tensioner seem fine while the idler is failing?

Yes. In this case, the tensioner checked out, but the guide roller was bad and caused the persistent noise. Replace noisy rollers even if tensioner operation looks normal. This prevents belt damage and loss of assist. [Elektroda, Mroziu88, post #16819775]
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