New noise - 300Tdi - Defender Source
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  #1  
Old November 5th, 2017, 12:33 PM
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Mike & Carrie Wendt
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New noise - 300Tdi

Two days before fixing the starter on my 90, my 110 started with a new noise.

300Tdi.

It seems to begin after fully warm. Most often at highway speed. Sounds like the squeaking/squealing of a lose alternator belt. But I don't think a serpentine belt can slip or squeal like that.

Or can it? The idler pulley seems to keep the correct tension.

My next thought was the accessories. I've checked idler pulley, water pump, alternator, nothing obvious. Except the idler has a little play.

I have an electric fan, so no viscus fan.

Ideas? What else to check for? How do I verify the idler is good or bad?

I'm avoiding driving it for now. Good thing I have my 90 running again.

Thanks as always.

Mike & Carrie
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  #2  
Old November 5th, 2017, 12:41 PM
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A cell phone video would help tremendously
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  #3  
Old November 5th, 2017, 12:44 PM
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I'm thinking it's the bearing in the serp idler that is mounted on thr case. It's a common failure point.

Good news is that the bearing is super easy to replace with a press or a big socket and a hammer, iirc bearing numerous is a 6203-2rs (dual rubber seal)
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  #4  
Old November 20th, 2017, 04:02 PM
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Is the idler pulley bolt left hand thread?

Thanks,

Mike & Carrie
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Old November 20th, 2017, 09:24 PM
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My adjuster pulley bearing started doing that a while back. Have you tried the old trick of putting a metal rod/screwdriver near the pulley and putting the other on your ear to determine the source of the noise? Also try spraying the belt with belt dressing - if the noise goes away, then your belt is squeaking.
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Old November 20th, 2017, 09:58 PM
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I had a similar noise...right before the power steering pump shelled out.
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Old November 22nd, 2017, 11:00 PM
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Can anyone say with certainty, is the tensioner pulley bolt left or right hand thread?

Happy Thanksgiving,

Mike and Carrie
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  #8  
Old November 23rd, 2017, 01:12 AM
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Quote:
Originally Posted by GuamPilot View Post
Can anyone say with certainty, is the tensioner pulley bolt left or right hand thread?
With much certainty, I will say that a tensioner pulley bolt is definitely left or right hand thread. Just not which one.

A belt/tensioner pulley bolt will be threaded to tighten in the direction of belt travel, so that if its bearing or bushing binds/drags, it won't loosen and cause confusion and delay.

A viscous fan bolt is threaded to tighten with (or be tightened by?) the drag of the viscous coupling and fan, since those have drag by design. On some vehicles, one just installs them snug with fingers and they self-tighten further when the engine is started.
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Old November 23rd, 2017, 10:08 AM
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Doug Crowther
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a harbor freight mechanics stethescope will help you diagnose beyond question where the noise is.

The tensioner bearing is a common issue.

I have have had brand new belts squeak. The brits use a "penny trick". It's worked for me as well.
https://www.landyzone.co.uk/land-rov...y-trick.64595/

"Works a treat "

Tensioner bolt is right hand, roller is left hand
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  #10  
Old November 23rd, 2017, 10:16 AM
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Quote:
Originally Posted by GuamPilot View Post
Can anyone say with certainty, is the tensioner pulley bolt left or right hand thread?

Happy Thanksgiving,

Mike and Carrie
Check out the link UD posted above, gives the handed thread you seek.
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