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Gareth

Member Since: 12 Dec 2011
Location: Woodford
Posts: 1115

L663 D300 Auxiliary drive belt squeal.

I’ve had this before at about 17k miles,and warranty fixed it. However at 33k it’s started squealing again.

When cold the belt is making a regular chirp, it goes silent once warmed up.

Has anyone got a picture of the installation, or a diagram of components. I think it’s one of the idler pulleys. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy

14th Jan 2025 7:49am

peanutbob

Member Since: 12 Feb 2009
Location: UK
Posts: 298

Hi Gareth
I guess , as you already have it fixed under warranty before, that you know that JLR issued a mod a couple of years ago, to alter the start up procedure which was using the hybrid battery which put too much pressure on the belts. They sent engineers out to alter this so that the affected defenders started up via the starter motor rather than the hybrid battery. They did this with my previous D300.

15th Jan 2025 6:22pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2898

That's interesting.

How do you know which starting method a Defender is using. ls there any way to tell?

15th Jan 2025 7:24pm

peanutbob

Member Since: 12 Feb 2009
Location: UK
Posts: 298

If it’s starts in hybrid mode it’s a muffled sound, whereas if it’s an earlier d300 and the mod was done you will hear the starter engage and then the diesel engine sound.
My first D300 was August 21 and the mod done circa 1 year later. I now have a Jan 23 d300 which starts a bit more hybrid like…but I’m not 100pc sure as it’s presently marooned in Group 1 Chester with suspension knocking and am presently running around in an Ewok hybrid which definitely starts in hybrid mode and reserves 3 - 5pc of electric to do so.

15th Jan 2025 8:28pm

Gareth

Member Since: 12 Dec 2011
Location: Woodford
Posts: 1115

Yes I do remember this. It involved a software update as well as new belt and gubbins.
I’m hoping it’s just the idler this time. There is an awful lot of vibration of the belt driven components when it’s running. I’m not actually sure which bit is the tensioner. As you look down the front of the engine under the coolant hose, on the right hand side there is what looks like an alternator. The pulley on that seems to be mounted to a bracket that vibrates a lot when the engine is running.
Access and visibility is poor, so was hoping to get a diagram of parts. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy

15th Jan 2025 8:32pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2898

My D250 was delivered in November 2022 so hopefully the modification was done. l've never had any issues with vibration or belts squeaking.

16th Jan 2025 9:08am

Hairy Dan

Member Since: 25 Apr 2013
Location: NW Durham
Posts: 1423

1998 Defender 90 V8 Petrol 50th Auto Chawton White

Had mine done twice now

Cheers Ian
--------------------
22MY Defender 110 D200 SE, Fuji White.
Kielder 4x4 Safari
Instagram @defender_v8

16th Jan 2025 1:33pm

Moo

Member Since: 01 Oct 2021
Location: UK
Posts: 1424

Two years and 36,000 miles and not a steak. Eiger Grey MY23 D250 SE with bits. Known as Noddy.

16th Jan 2025 11:28pm

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