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Home > Technical > Auxillary Tensioner / Idler pulley
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Dave47



Member Since: 31 Aug 2014
Location: Margate Kent
Posts: 1357
United Kingdom 2008 Freelander 2 TD4 SE Auto Izmir Blue

Coincidence, I've just had mine investigated for clicking/slapping,,,,,,, and it's the alternator pulley, Thumbs Up
it had some slackness in it, job done. DAVE.
Post #444493 4th Sep 2024 8:56 am
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O-B-Wan003



Member Since: 12 Sep 2017
Location: county Down
Posts: 130
United Kingdom 2014 Freelander 2 SD4 HSE Auto Santorini Black

jules wrote:
That slapping of the belt on the tensioner pulley is very characteristic of a worn overun alternator pulley (OAP) - it works like a freehub on a bicycle - allowing the alternator to continue to spin fast when the engine slows down. When the OAP fails it drags the alternator down and puts a lot of extra tension in the belt causing the tensioner pulley to jump about . The OAP is easy to test with the AUX belt off.
You need a special tool (not expensive) to remove it from the alternator though - to hold the alternator shaft and turn the OAP separately.

M10/33teeth tool



The idler and tensioner pulleys are easy to replace (ive just done mine).



Jules, Just out of curiosity did you have any bother with the alternator pulley and removal? I've seen mixed reports on difficulty when removing the pulley and teeth being rounded. Was thinking of tackling it myself but the thought of complications such as taking the power steering pump out scares me slightly.
Managed the two other pulleys which were a heck of a lot easier than I imagined.

Stephen.
Post #444914 25th Sep 2024 7:42 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 5254
United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Hi O-B...

No, I didnt replace the alternator pulley, though I bought the tool (£6). When I replaced the FEAD belt pulleys and I then determined that the fault lay with the AC compressor and the alternator pulley seemed fine.

So I'll cross that bridge another day. Jules
Post #444919 26th Sep 2024 9:21 am
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O-B-Wan003



Member Since: 12 Sep 2017
Location: county Down
Posts: 130
United Kingdom 2014 Freelander 2 SD4 HSE Auto Santorini Black

Replaced the Alternator pulley today which was most definitely seized and very noticeable when the new pulley was replaced. The tool that Jules recommended did the job and it wasn't too much of a pain to remove the old one from he alternator. Replaced the fuel filter as well.
So the three pulleys have now been replaced; Idler, Tensioner and alternator pulley.
Post #445568 22nd Oct 2024 6:46 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 5254
United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Thumbs Up well done Jules
Post #445569 22nd Oct 2024 10:47 pm
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Arctic



Member Since: 24 Aug 2016
Location: Westmidlands
Posts: 598
United Kingdom 2014 Freelander 2 SD4 HSE Auto Orkney Grey

Quote:
O-B-Wan003 wrote:
https://youtube.com/shorts/0JUZq-SWTE0?feature=share


Wow you did good to do that video of the bouncing pulley, good find.

Last edited by Arctic on 28th Oct 2024 11:07 am. Edited 1 time in total
Post #445637 27th Oct 2024 11:58 am
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O-B-Wan003



Member Since: 12 Sep 2017
Location: county Down
Posts: 130
United Kingdom 2014 Freelander 2 SD4 HSE Auto Santorini Black

Artic I initially thought it was something on top of the engine around the injectors but as I have a hearing issue I wasn't able to locate it as I don't have 3-D hearing anymore Laughing It was my son who advised me where the sound was coming from and so when I had a look in the area of the pulleys it was obvious there was an issue there.

It was only after replacing the tensioner and idler pulleys did it become really apparent it was the alternator pulley as the annoying rumble hadn't been completely eradicated. Neither job was complicated or hard to be honest just putting the alternator back in its tight spot and replacing the fuel filter was the hardest job.
Post #445664 28th Oct 2024 10:12 am
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