Turbo whistling/whinning

Submitted: Monday, Feb 17, 2003 at 19:01
ThreadID: 3418 Views:1966 Replies:4 FollowUps:6
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Hi all,

Just went for a trip up the Central Coast last weekend and noticed a low level whistle/whinning from the turbo, it starts at about 2000rpm (when the turbo starts to kick in) and builds as the turbo speed increases.
Could it be the berings in the turbo, could it be the start of a problem?


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Reply By: nissan4x4 - Monday, Feb 17, 2003 at 22:14

Monday, Feb 17, 2003 at 22:14
Hi Paul,
I had this explained to me by the mechanic at AG Diesel when I had mine serviced. What he said about the whistle was it is caused by the gap between the edge of the blades and the inner wall of the turbo. Can't exactly remember, but it was along the lines of the amount of air flowing passed the outer edge as apposed to through the blades. Basically he said a snug fitting balanced turbo should have minimal whistle. In your case, if this noise has only just started, it could be bearings causing the shaft to shift horizontal/vertical position thereby atlering the gap between the blades and the inner wall. If you haven't had the turbo serviced, now might be a good time to spend a little $$, instead big $$ later.

AnswerID: 13358

Follow Up By: Member - Paul - Monday, Feb 17, 2003 at 22:16

Monday, Feb 17, 2003 at 22:16

Its a Patrol 3.0 TD still under factory warranty......would this be covered?

FollowupID: 7841

Follow Up By: Nissan4x4 - Tuesday, Feb 18, 2003 at 08:15

Tuesday, Feb 18, 2003 at 08:15
Andrews comment below about oil quality is a good one. As to warranty, doing something stupid with the car is about the only thing that wont be covered. Don't be afraid to take it back and INSIST that they resolve it or give you an explanation as why there is nothing to resolve.
You will have paid good money for the car, so you should expect good service to come with that.
FollowupID: 7854

Follow Up By: David - Friday, Feb 21, 2003 at 17:48

Friday, Feb 21, 2003 at 17:48
If they say there's no problem GET YOUR COMPLAINT and their reply IN WRITING!!!
FollowupID: 8065

Reply By: Andrew - Tuesday, Feb 18, 2003 at 00:19

Tuesday, Feb 18, 2003 at 00:19

I have an 8 month old TD 3.0L patrol too. Iv'e now done near 20,000km in it with no real probs. However, between 10,000 and 15,000km I noticed a definite noise from the turbo at the 2500rpm point. At slightly higher or lower RPM's the noise went away ?????
I changed my own oil at the 15,000 mark with that recommended by the handbook and the noise has gone. I suspect the dealership who serviced the car at 10,000km just put their standard bleep oil in it during that service.
According to the handbook, this motor is fairly fussy about the type of oil that goes in it. So be ware!!!! This may be you problem. I am not a mechanic but I think it has something to do with the ability of the oil to get up into the turbo. I intend bringing it up with my dealer at my 20,000km service. Trouble is, with the dunderclumpins behind the service desks these days, if they can't actually hear the problem then there's no problem!! They don't care. Thats why sites like this one are so good. With all our heads together we know more than the dealers do!!
Anyway, change you oil and see how you go.
AnswerID: 13376

Follow Up By: Member - Paul - Tuesday, Feb 18, 2003 at 07:20

Tuesday, Feb 18, 2003 at 07:20

Thanks but just looked at the last service record the mechanic did, claims he put in 8 Llt of Genuine Nissan Engine oil,

Maybe I should just bit the bullet and pay Nissan their service overheads.

FollowupID: 7851

Follow Up By: Member - Bob - Tuesday, Feb 18, 2003 at 09:03

Tuesday, Feb 18, 2003 at 09:03
That's a good point about having the dealer service the vehicle. It certainly costs more, but looks a lot better at resale time. If the car is older, or you intend to keep it forever, then non-dealer servicing will not affect resale. What do others think about the merits of dealer servicing versus local mechanic or specialised 4WD servicing?
FollowupID: 7855

Reply By: Gary - Tuesday, Feb 18, 2003 at 14:47

Tuesday, Feb 18, 2003 at 14:47
Not all dealerships are the same but I for one got sick of been looked down at when ever I reported a problem with my vehicle. In some cases it maybe better to have the vehicle serviced by a dealership but in mine, I prefer to do it myself if possible. I am a mechanic by trade and can handle the general run of the mill things and if needed Im not scared to take to someone who is the expert in that field ie injectors, fuel pump etc
I dont beleive the dealerships offer a better service than others, in fact it maybe less some times but all being said taking your vehicle to the dealership to be serviced will maintain your warranty..This maybe important to you and resale value.
My humble thoughts.

AnswerID: 13389

Follow Up By: Diamond - Tuesday, Feb 18, 2003 at 20:05

Tuesday, Feb 18, 2003 at 20:05
i woked at a toyota dealer for a little while and most not all services are done by apprentices basic stuff.as for keeping your waranty bye using dealer dosnt have to be so long as its a registered buisness and work done bye a mechanic and use genuine parts you should be right.where i work now we use ryco filters which
cover vehicle manufacturers waranty if some thing does go wrong and there someti9mes half the cost
FollowupID: 7872

Reply By: desert - Tuesday, Feb 18, 2003 at 17:12

Tuesday, Feb 18, 2003 at 17:12
Paul, all turbo's will make a whistling noise when working at compressing air into the manifold. The point of your question is, what is a normal whistle as compared to a problem whistle. I would suggest you trot down to another Nissan dealer and pretend you are in the market for a new truck, get a road test drive of a new one and judge the difference between it and your own vehicle. Bare in mind, that as the engine loosen's up and begins to make some horsepower, this also has an effect on the turbine speeds as well. A tight, new engine cannot expel the same quantity of exhaust as a "run-in" engine, and so as the engine begins to "go", so too does the turbo begin to do it's thing.
AnswerID: 13403

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