200Tdi Alternator Belt Issues

 
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knappster
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PostPosted: Wed Sep 22, 2021 8:05 pm    Post subject: 200Tdi Alternator Belt Issues Reply with quote
The alternator belt on my 90, fitted with a discovery 200Tdi is loose. The alternator itself is not loose and does not appear to need adjusting. Online research suggests that the defender 200Tdi has a 11mm wide belt and the discovery a 10mm wide one, which may explain why this is the second belt that has become loose in less than a year. For the last few weeks, when starting from cold, there has also been a slight screech from the belt, which is also a sign that it is loose.

Has anyone else had an issue with loose alternator belts on a 200Tdi, particularly a disco 200Tdi? The internet shows the belt as part number ETC7939, common to the 2.5 diesel, 2.5 Turbo diesel, 2.5 petrol and 200Tdi.
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Rich.

Owner of a 200Tdi Disco-engined 90
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Geoff2
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PostPosted: Thu Sep 23, 2021 2:23 am    Post subject: Reply with quote
I thought you just moved the alternator a bit on its bracket to tighten the belt to the right tension. That's what I did a while ago on my V8 - it was a new belt and needed tightening slightly after a few hundred miles and started squealing a bit on starting. Am I missing something? Are 90s/200Tdis any different?
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knappster
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PostPosted: Thu Sep 23, 2021 7:16 pm    Post subject: Reply with quote
The alternator hasn’t moved and if the belt has stretched, it has done so suddenly. My first thought was to adjust the alternator so that the belt is tensioned again, but given that it has lasted around eight months, it shouldn’t have stretched that much just yet.

Some googling suggests that it is quite a common issue for disco 200Tdi’s to have issues with alternator belts due to differing widths. I should hopefully finish a bit earlier tomorrow so I’ll try to adjust the alternator and hopefully it won’t be a temporary fix.
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Rich.

Owner of a 200Tdi Disco-engined 90
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Geoff2
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PostPosted: Thu Sep 23, 2021 10:30 pm    Post subject: Reply with quote
I don't know about your set up but my handbook says to check the tension of a new fan belt and adjust as necessary after approx 1,000 miles running.
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knappster
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PostPosted: Fri Sep 24, 2021 6:36 pm    Post subject: Reply with quote
Thanks Geoff, you are likely correct. Smile

I gave my Indy guy a call and he said V-belts do stretch over time as the V-section wears away. It’s been around 2k miles since it was fitted, so it was overdue an adjustment. He was aware of the issue with different thickness of belts too. I’ll just have to keep an eye on it. I’ve got a spare on order so I’ll keepnit in the event of the existing one failing or becoming so stretched that it isn’t possible to tension it any further.
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