V6 Petrol : Noise from belt/pulleys

Technical questions and answers about the Mazda Bongo

Moderators: Doone, westonwarrior

tim.shaw
Apprentice Bongonaut
Posts: 10
Joined: Sat May 16, 2020 10:37 pm

V6 Petrol : Noise from belt/pulleys

Post by tim.shaw » Mon Sep 28, 2020 3:23 pm

Hi,

I've recently had my engine serviced, and it's been running beautifully. However I've started to get a noise from the front of the engine. My local garage identified it as a worn crankshaft pulley (CS). I have tried to get one of these, but cannot find one directly online.

In answer to my query, someone said 'This is quite an unusual part to need to be replaced', which has raised the concern that the garage might be wrong.

The garage said that the belt appears to be rubbing unevenly on the bottom pulley; the bolt is tight and the fanbelt is correctly adjusted.
I'm willing to go back to them if this is unlikely.

This link is to a sound recording from under the driver door, at idle, and when hot. When it's cold, this noise doesn't occur.
https://www.dropbox.com/s/7r1pm4ywvgbos ... k.mp3?dl=0

I'd very much appreciate any advice (and a pointer to a place to get a crankshaft pulley if it seems appropriate).

Thanks for your attention.

tim
User avatar
g8dhe
Supreme Being
Posts: 8793
Joined: Sun Apr 13, 2008 10:06 pm
Location: Worthing, West Sussex.

Re: V6 Petrol : Noise from belt/pulleys

Post by g8dhe » Mon Sep 28, 2020 4:01 pm

There are two belts do you know which one is rubbing ?
http://www.lushprojects.com/bongopartsm ... mgno=.html
One is for the air con alone, the other does waterpump, alternator & power steering.
Geoff
97 V6, AFT, full side conversion.
Image Spherical Visions
nth
Bongolier
Posts: 312
Joined: Mon Jul 02, 2012 3:21 pm
Location: Scotland

Re: V6 Petrol : Noise from belt/pulleys

Post by nth » Mon Sep 28, 2020 6:41 pm

Im not familiar with the V6 but is it a solid pulley or dual mass/dampened pulley?
It would be an unusual thing to have to replace if its a solid pulley but not if its a dampened type, these wear over time & the 2 half's can start to separate.
95 2.5d 4WD AFT
tim.shaw
Apprentice Bongonaut
Posts: 10
Joined: Sat May 16, 2020 10:37 pm

Re: V6 Petrol : Noise from belt/pulleys

Post by tim.shaw » Mon Sep 28, 2020 8:06 pm

Hi,

My airco belt has been taken off after the bearings on the compressor went (and I didn't use it anyway). So it's just the one belt.
I haven't been able to find ANY details on the pulley itself - but I have seen references to dampened ones (but I thought that was just TD?).
I haven't got in-close with the (indicated) offender yet.

Thx

tim
willow2u
Bongonaut
Posts: 96
Joined: Tue Jun 30, 2020 2:35 pm

Re: V6 Petrol : Noise from belt/pulleys

Post by willow2u » Mon Sep 28, 2020 10:14 pm

I think the pulley looks like a solid one either belts on its way out or a bearings drying out perhaps
rita
Supreme Being
Posts: 3219
Joined: Tue Sep 15, 2009 7:11 pm

Re: V6 Petrol : Noise from belt/pulleys

Post by rita » Mon Sep 28, 2020 10:24 pm

Your best bet is to have the pulley removed and inspected along with the shaft , if needed it is possible to have the pulley repaired .
tim.shaw
Apprentice Bongonaut
Posts: 10
Joined: Sat May 16, 2020 10:37 pm

Re: V6 Petrol : Noise from belt/pulleys

Post by tim.shaw » Tue Oct 13, 2020 9:40 pm

A follow up for this.
After the feedback, I took the van back to my local garage, because I wasn't convinced.
Turns out that that noise is a good recording of a water-pump going!
It wasn't the pulley (but, to be fair, that was from a cursory examination).
I'm much happier now, knowing what the problem is. To be fixed shortly.
Regards
tim
Bob
Supreme Being
Posts: 14455
Joined: Wed Oct 17, 2007 12:54 pm
Location: North Somerset

Re: V6 Petrol : Noise from belt/pulleys

Post by Bob » Tue Oct 13, 2020 9:42 pm

Sound.

Feedback is really useful, too. :)