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alternator belts & fan functioning


 
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jejoenje



Joined: 20 Aug 2016
Posts: 785
Location: Alloa, Scotland

PostPosted: Mon Mar 16, 2020 12:46    Post subject: alternator belts & fan functioning Reply with quote

Hi all,

So I replaced my alternator belts yesterday afternoon.
I had a pair of belts which I got in the summer (long road trip spare just in case) and the old belts had started squealing horribly again, so needed to get done.
B***dy h*ll, it really is a pain to get at them isn't it!
I very nearly rounded one of the bolts holding the fan onto the pulley, luckily a fair bit of sweating and swearing helped ease it off.
I am intending to get a new set of bolts for it.

Anyway, all went back together okay and am happy to say that the squealing has indeed been sorted  hello1

However, when I ran the engine for testing with all covers etc off, I noticed that the fan started spinning straight away...

I thought this was supposed to be of the type that doesn't start spinning until the engine is hot (it certainly wasn't hot, not even warm, really)  Question

Is this something I should be worrying about?

Ta! Smile
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PostPosted: Mon Mar 16, 2020 12:46    Post subject: Google Ads keep this community free to join!


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jejoenje



Joined: 20 Aug 2016
Posts: 785
Location: Alloa, Scotland

PostPosted: Mon Mar 16, 2020 12:47    Post subject: Reply with quote

Thinking about it, given how much help this forum has given me over the years, I may see if I can write up a "how to" on replacing the belts...?  Very Happy
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Mon Mar 16, 2020 22:57    Post subject: Reply with quote

Did you try spinning the fan by hand with the engine stopped? It has a viscous, thermostatic clutch which always has enough drag to turn the fan, but it doesn't fully engage until the engine is very hot. I need to do that belt change, been squealing for a while now.
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Fostlongstrider
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Joined: 03 Mar 2008
Posts: 2589
Location: Hedon, East Yorks

PostPosted: Tue Mar 17, 2020 10:17    Post subject: Reply with quote

Me too.
Looks like a "Self Isolation" project!!!
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jejoenje



Joined: 20 Aug 2016
Posts: 785
Location: Alloa, Scotland

PostPosted: Tue Mar 17, 2020 12:04    Post subject: Reply with quote

Andy, yes, I did - it spins freely with the engine off but there's quite a bit of "drag" even from cold...  scratch
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andyman



Joined: 08 Dec 2012
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PostPosted: Tue Mar 17, 2020 22:40    Post subject: Reply with quote

Yes, that's the way it works!
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jejoenje



Joined: 20 Aug 2016
Posts: 785
Location: Alloa, Scotland

PostPosted: Thu Mar 19, 2020 13:50    Post subject: Reply with quote

Ah okay! Smile
I guess I just don't quite get it then. I would have thought that lots of drag from cold would mean that it would be spinning faster when cold, rather than slower. Anyway I will stop worrying about it then!  Very Happy

More annoying is that there is a bit of screeching again now when first starting.
I suppose this could just be the P/S belt (which really needs replacing too, by the looks of it, I just didn't have a new one for it when I did the alt belts), or the tension on the new alt belts needs upping a little.
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andyman



Joined: 08 Dec 2012
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Location: Penrith

PostPosted: Thu Mar 19, 2020 20:45    Post subject: Reply with quote

The P/S belt shouldn't screech unless it's a bit loose and you are turning the wheel hard. It wouldn't just squeal on startup, - that has to be the alternator belt. Try another half-turn on the adjuster (having loosened the locknut). Cold mornings are always the worst.
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