Disco 2 A guessing game. UPDATE

Hi guys, check the sound out https://youtube.com/shorts/2UYhNpIjqB0?feature=share

that frigging sound comes from that area, it changes it's "style" and gets silencer if i force the aircon on but still there, it dissapears only if i remove the belt, then it runs nice...anybody had such thing? can be the compressor or something else ?, no play in any pulley there, it eats my mind cos it's quite loud and i'm clueless what to do next. Any suggestion will be gratefully received.

Idler on its way out? Free running and only snatching now and then until the AC load is applied to the belt system?

DanClarke said:

Idler on its way out? Free running and only snatching now and then until the AC load is applied to the belt system?

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Thanks for the reply... what do you mean by "idler" please cos i'm dumb when it comes to such mechanical things

I would say it sounds like my ace pump did after it lost all its fluid....
Or viscose fan bearings maybe....

I would say its not the AC compressor as its not running in your vid.
When you turn on the AC it requires more load on the belt.

Its possible to be the Idler puller, the 1 that adjusts the tension does it bounce around more when AC off (as Dan ^^).

J

Thanks guys, i figured out that the "idler" is the belt tensioner so i'll replace it first and pray to be that even though the sound is louder in the compressor area, i hope it's not something in it's clutch

sierrafery said:

Thanks for the reply... what do you mean by "idler" please cos i'm dumb when it comes to such mechanical things

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I'm sure you are far more technically able than I. I mean that there is usually an idler/tensioner pulley on the serpentine belt.
On my V8 (yes, not same as your vehicle I know) there was a recall by LR because the pulleys failed and a replacement part was applied as a service intervention.
The story I heard was that a failing idler was characterised by a "chirrup" from the belt area.

sierrafery said:

i hope it's not something in it's clutch

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If it was in the clutch I would expect it to go when AC on.
Have you tried to spray the pulley with some oil and see if it quiets down. but it may not be the bearing it could be the tension side of it.

Mine chirps like a budgie and goes away with a little squirt of wd (for a while) Must fit the replacement.

J

marjon said:

Have you tried to spray the pulley with some oil and see if it quiets down.

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No i didnt but i will

Tis common for the idler/tensioner to go on the td5, usu@lly chirps when st@rting n stopping the engine
whilst the belt is off check the cr@nk pully for we@r @s they @lso we@r n m@ke the s@me
sort of noises.

Fery, you can carefully use a screwdriver touched against the area and your ear and use it like a stetethscope (bet I splet that wrong) and listen for the noise.
Griff

sierrafery said:

No i didnt but i will

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Applying spray to the pulley does nothing as the bearings are sealed except that it could contaminate and slip the belt. Use a pick and hook set, remove the protective ring covers and apply some bearing grease on both sides. It will be as good as new if the bearings are not worn.

BTW, that is the tensioner pulley. The idler pulley would be installed instead of the ACE pump if you don't have ACE.

NPG said:

Applying spray to the pulley does nothing as the bearings are sealed except that it could contaminate and slip the belt. Use a pick and hook set, remove the protective ring covers and apply some bearing grease on both sides. It will be as good as new if the bearings are not worn.

BTW, that is the tensioner pulley.

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Thanks. I was up to to use some spray on the compressor pulley from behind, do you mean that too... it got plenty of coolant these days even though i tried to protect it as i had to work with the heater core to unclog it and bled the system many times... so can i do something with the compressor clutch pulley while it's in situ or do i have to remove it? ... is that so simple to just undo the bolt and pull it out? i replaced the whole compressor some time ago but never removed the clutch

I'm afraid spraying the compressor pulley won't help either. But you can work on the clutch, bearing, etc with the compressor in situ, provided that you have the right tools. This is a good instruction video of a clutch and bearing disassembly on a compressor similar to the one installed on the TD5 -

I never said spray the AC pulley. did I?
I was referring to the tensioner and its mech.

J

marjon said:

I never said spray the AC pulley. did I?
I was referring to the tensioner and its mech.

J

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No worries, my mind was set to th compressor from the beginning

NPG said:

I'm afraid spraying the compressor pulley won't help either. But you can work on the clutch, bearing, etc with the compressor in situ, provided that you have the right tools. This is a good instruction video of a clutch and bearing disassembly on a compressor similar to the one installed on the TD5 -

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Thanks for that, now it's crystal

sierrafery said:

Thanks for that, now it's crystal

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It's an easy enough job and it always helps if you have a press should you need to replace the bearing. What is really important is to collect all the hardware (bolts, spacers, washers, etc.) and note their location as it's a nightmare to source separately.

That can be just a belt. I had a ****ty Dayco one make that noise on my V8 DIsco 1. it can also be an idler or bearing, as mentioned above.

Easier to start with the cheap checks first though!

CAREFULLY hold a candle onto both sides of the belt (so they eat into the wax a bit and coat the belt) and see if the noises goes for a while.

Both sides of the belt rubs on pullies and idlers and can make that noise.

I used the wax for a few weeks, while I waited for a new belt to arrive - no more problem.

Remove the belt and give all the pulleys a spin is the easiest thing to do..