Belt squeal help

#1
Hi,
Not sure if this is the right place to post, but hoping someone could help. Whenever I start my Nissan navara d22 YD25 2.5L, there’s a horrible noise, which only lasts several seconds. After the car warms up, the sound doesn’t even happen (It only happens on cold starts, or if the car has been sitting for a few hours). One time when it happened, I put on the AC, and it got a bit louder, but then continued to fade after a few seconds. I have a video but can’t upload - too big.

Thanks
 

Hoyks

Well-Known Member
#6
If they are brand new, then its a fair bet that they have stretched a bit and need adjustment.

Loosen off the clamping bolt on the alternator, give the screw adjuster a few turns and then tighten up the clamp bolt.
 
#7
I hope you are only asking here for curiosity as any fix should be done by the Nissan dealer under warranty. Take it back and complain.
Tink
Yeah, just want to learn how to fix these issues myself. If I can’t get it right, I’ll definitely take it back.
 
#8
If they are brand new, then its a fair bet that they have stretched a bit and need adjustment.

Loosen off the clamping bolt on the alternator, give the screw adjuster a few turns and then tighten up the clamp bolt.
I’ll give it a try thanks
 
#9
If they are brand new, then its a fair bet that they have stretched a bit and need adjustment.

Loosen off the clamping bolt on the alternator, give the screw adjuster a few turns and then tighten up the clamp bolt.
I had a look, and it seems like one of the belts around the alternator is a bit loose, but the second belt around the alternator is fine. If I use the tensioner, it would tighten both belts correct? How would I go about only tightening the belt furthest from the engine. Shown in a picture below
 

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Hoyks

Well-Known Member
#10
Yes, the tensioner will tighten both belts, you can't tighten just one. It probably only need around a 1-2 turns to take the slack out.

The belts could be different tensions for a few reasons:
Stretched,
worn so it sits down the the V more,
the pulley is worn so the V is wider or,
the belts aren't the same.
a bearing is failing, so the front of the pulley can deflect more.
 
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#11
Yes, the tensioner will tighten both belts, you can't tighten just one. It probably only need around a 1-2 turns to take the slack out.

The belts could be different tensions for a few reasons:
Stretched,
worn so it sits down the the V more,
the pulley is worn so the V is wider or,
the belts aren't the same.
a bearing is failing, so the front of the pulley and deflect more.
Thanks.
I have it a tighten and the noise is gone! Thanks to all replies
 
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