Hi all
as per subject I have a 99 V6 petrol with 100km.
Recently changed auxiliary belts and replaced one of the tensioner bearings as it felt rather dry.
Timing belt was changed a year before I purchased it. Im not sure if the timing belt pulleys were changed.
Engine runs really nice.
However, when the engine gets up to temperature I get a slight squealing noise when I put my foot on the accelerator.
This is mainly from around 1800 rpm in any gear.
Mainly occurs when driving in a straight line, sometimes if I am turning the noise isn't there.
I cant remember if the noise was there before I changed the belts as I serviced and changed belts etc straight away upon purchasing the vehicle.
On researching I am guessing it could be one of the following:
Water pump bearing
tensioner bearing
air con / alternator / steering pump bearing
belts need to settle in (cant really see this one)
Does anyone have any suggestions?
What is the best way to determine which of the above? It doesn't make the noise when stationary.
Although I heard it a couple of times if I had it in drive with all the brakes on and revved the engine.
So I cant get close to the components when its making the noise.
Is it likely to be one of the above and not timing belts pulleys?
Regards
Sean
V6 Petrol Noise When Warm
Moderators: Doone, westonwarrior
Re: V6 Petrol Noise When Warm
Might be worthwhile checking the tension of the two aux. belts as a start before getting any deeper as anything else at the front of the engine means taking a lot of things off!
I have heard people suggesting spraying each aux. belt in turn with water to see if anything changes - not something I've tried merely reporting what has been suggested elsewhere!
I have heard people suggesting spraying each aux. belt in turn with water to see if anything changes - not something I've tried merely reporting what has been suggested elsewhere!
Geoff
2001 Aero V6, AFT, full side conversion.
2001 Aero V6, AFT, full side conversion.
Re: V6 Petrol Noise When Warm
I removed the air con belt - noise was still there
I then removed the main auxillary belt and the noise went.
The tensioner pulley bearing was replaced a little while ago and seemed perfectly ok.
Alternator & power steering pulleys seem ok.
Whilst the engine was still hot i spun the water pump and it sounded a little dry / squeak noise.
It seems to have a bit of play in it but generally feels ok when cooled.
The fact that the noise only appears when it gets warm and over 1800 rpm leads me to think its the pump.
So I have drained the coolant, removed the tensioners and the main plastic timing belt cover.
I am struggling to remove the smaller one though.
The 2 bolts that hold the dip stick tube in place have been removed and the tube turns but wont come out.
Does anyone know if i need to remove the distributor & top alloy timing belt cover to remove the plastic section?
Or how does the dipstick tube come out?
I then removed the main auxillary belt and the noise went.
The tensioner pulley bearing was replaced a little while ago and seemed perfectly ok.
Alternator & power steering pulleys seem ok.
Whilst the engine was still hot i spun the water pump and it sounded a little dry / squeak noise.
It seems to have a bit of play in it but generally feels ok when cooled.
The fact that the noise only appears when it gets warm and over 1800 rpm leads me to think its the pump.
So I have drained the coolant, removed the tensioners and the main plastic timing belt cover.
I am struggling to remove the smaller one though.
The 2 bolts that hold the dip stick tube in place have been removed and the tube turns but wont come out.
Does anyone know if i need to remove the distributor & top alloy timing belt cover to remove the plastic section?
Or how does the dipstick tube come out?
Re: V6 Petrol Noise When Warm
Update on my noise.
I have now changed the water pump.
Also had a number of people look at it and all say it’s not the belt system.
I have driven it over 3000 miles and the engine/transmission runs fine.
Occasionally when I start the vehicle from cold I can hear the noise but it disappears before I can trace it.
Within 5 minutes of driving I start to hear the whining noise over 1500rpm.
It happens when accelerating or decelerating but not if it’s coasting.
When the engine is fully up to temperature the noise disappears completely after about 20 minutes.
I am now thinking this could be to do with the air system?
It is rev related and also heat related.
Is there a temp sensor that could be causing the air system to open/close incorrectly that is causing a whistling noise?
I can only get it to make the noise when driving.
It is most definitely not the transmission.
I have now changed the water pump.
Also had a number of people look at it and all say it’s not the belt system.
I have driven it over 3000 miles and the engine/transmission runs fine.
Occasionally when I start the vehicle from cold I can hear the noise but it disappears before I can trace it.
Within 5 minutes of driving I start to hear the whining noise over 1500rpm.
It happens when accelerating or decelerating but not if it’s coasting.
When the engine is fully up to temperature the noise disappears completely after about 20 minutes.
I am now thinking this could be to do with the air system?
It is rev related and also heat related.
Is there a temp sensor that could be causing the air system to open/close incorrectly that is causing a whistling noise?
I can only get it to make the noise when driving.
It is most definitely not the transmission.
Re: V6 Petrol Noise When Warm
Hi, sorry to hijack your thread but was wondering if you can share your experience on the water pump change.
Once you get the pulley off are all the other fixings accessible or do you need to remove more components/covers?
Any tips for someone doing it the first time?
Where did you get your pump from? Most seems expensive and/or out of stock.
Once you get the pulley off are all the other fixings accessible or do you need to remove more components/covers?
Any tips for someone doing it the first time?
Where did you get your pump from? Most seems expensive and/or out of stock.
Re: V6 Petrol Noise When Warm
Hi
You will need to remove the cam belts plastic covers.
I found you had to remove the distributor cover as well. But don’t worry it’s just a couple of bolts and goes back on easily with no adjustment needed to the distributor.
The dip stick tube will pull out once removed the bolt.
Then it’s a matter of about 10 bolts to remove the water pump (seams a little excessive to me)
I got mine from MazdaBongo.com but BongoSpares is also great. Both are reasonably competitive and if Bongo Spares use them to service vehicles then they must be ok.
I think they all sell the same makes as I can’t think many manufacturers would make parts for such an old low volume vehicle.
Good luck
You will need to remove the cam belts plastic covers.
I found you had to remove the distributor cover as well. But don’t worry it’s just a couple of bolts and goes back on easily with no adjustment needed to the distributor.
The dip stick tube will pull out once removed the bolt.
Then it’s a matter of about 10 bolts to remove the water pump (seams a little excessive to me)
I got mine from MazdaBongo.com but BongoSpares is also great. Both are reasonably competitive and if Bongo Spares use them to service vehicles then they must be ok.
I think they all sell the same makes as I can’t think many manufacturers would make parts for such an old low volume vehicle.
Good luck