Runboard.com
Слава Україні!
Australian X-Trail Website Members Rides

Site Search

Facebook Aussie Forum Website Twitter Aussie Forum Website YouTube Aussie Forum Website Admin Mailbox Nissan Australia myNissan Capped Service Fuel Consumption Monitor Tyre Size Calculator Australian X-TRAIL Forum Live Chat

Forum Rules   
   Register for a free global account (learn about it) | LOG IN: globally (click here) (Lost Password?)




Page:
 1  2  3  4 

 
BONNET Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL NEWBIE
 


Date Registered: 04-2010
TOTAL POSTS: 5
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


Well i often here this as well.. " whinggggggg... quezz.. quezz.. quezz.. whingggg" (of course if you happen to be in front) then it stops! Yesterday my 5 year old son told me - amuse that i've put my ear close to the bonnet. "DAD! our car is like xformer?" replied back " yeah! its called x-tromus prime!!!

we both smile..... emoticon


/bonn

Last edited by BONNET, 29/Apr/2010, 8:16 pm


---
2010 T31 PRECISION GREY TS DCi
29/Apr/2010, 8:04 pm Link to this post Send Email PM   Send Private Message
 
Roughy Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL NEWBIE
 


Date Registered: 08-2010
TOTAL POSTS: 15
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


Hi,

I was looking under the bonnet of my XTrail while it was making the whirring noises etc after a long run, and noticed a sticker next to the battery that said "dont disconnect battery for 4 minutes after shutdown". I asked my Nissan dealer about it and he said it was the coolant pump circulating coolant through the inter-cooler, and the fuel pump returning unused fuel back to the tank. Disconnecting the battery while the fuel pump is running could cause a vapor lock. (?)

He could have been having a lend of me, but sounded plausible.

---
2010 TL Auto, Towbar, Window Tint...thats all :-)
22/Sep/2010, 4:06 pm Link to this post Send Email PM   Send Private Message Blog
 
mary peter Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL NEWBIE
 


Date Registered: 10-2010
Location: Sydney
TOTAL POSTS: 2
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


I feel sure the noise is, as noted by others, cooling for the turbo. This is no doubt related to the warning in the engine compartment: "Don't disconnect the battery terminal within 4 minutes after ignition off." In my case, the noise is more like a faint whistle than a buzz.

---
Peter G

T31 dCi Manual
30/Oct/2010, 10:37 am Link to this post Send Email PM   Send Private Message Blog
 
dieseldave Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL NEWBIE
 


Date Registered: 02-2010
TOTAL POSTS: 15
Reply | QUOTE
Re: Buzzing


Yep as suggested the buzzing sound is the electric water pump. Found it changing the oil yesterday, it is just to the rear of the sump. It runs a preset time, dependant on engine temp. It is used to prevent heat soak from the turbo's turbine cooking the oil in the turbine. This can lead to micro diamonds forming ont he turbos bearings, and early failure of the turbo bearing and seals. A very clever set up, probably brought about by warranty issues.
Roughy, your Nissan Dealer is either having a lend or you or doesn't know about these engines. Yes the coolant is circulated, but as described above. Every thing else he said is wrong. There is no coolant travelling through the intercooler it is an air to air type. The fuel pump is mechanically driven and is not able to return the diesel fuel to the fuel tank, and why would it? There is no such thing as vapour lock in a diesel, it has a common rail that is operating at 16000psi it is boarding on hydraulic lock.
Sorry, not meaning to thread dig, but just correcting factual errors.
S
30/Dec/2010, 9:08 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
Live feed
Blog
Friends
Miscellaneous info



Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
Re: Buzzing


quote:

dieseldave wrote:
Sorry, not meaning to thread dig, but just correcting factual errors.
S



No need to be sorry at all.
Advice from experienced members such as yourself is always welcome.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
30/Dec/2010, 9:23 pm Link to this post Send Email PM   Send Private Message Blog
 
Robbo0001 Profile
Live feed
Blog
Friends
Miscellaneous info

BANNED USER

Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


quote:

Yep as suggested the buzzing sound is the electric water pump. Found it changing the oil yesterday, it is just to the rear of the sump. It runs a preset time, dependant on engine temp. It is used to prevent heat soak from the turbo's turbine cooking the oil in the turbine. This can lead to micro diamonds forming ont he turbos bearings, and early failure of the turbo bearing and seals. A very clever set up, probably brought about by warranty issues.



Exceptional reply....I own a T30 (petrol) but you explained the T31 buzzing noise in one paragraph (love it, in case I ever run across it)

quote:

There is no coolant travelling through the intercooler it is an air to air type. The fuel pump is mechanically driven and is not able to return the diesel fuel to the fuel tank, and why would it? There is no such thing as vapour lock in a diesel, it has a common rail that is operating at 16000psi it is boarding on hydraulic lock.



Just explained 2 of the most common misconceptions...intercoolers and vapour lock. Great stuff D.

Edit....sorry missed this emoticon an informative AND technical post

Last edited by Robbo0001, 30/Dec/2010, 9:39 pm


---
Dave
99 GU Patrol 2.8TD
Ex-2002 T30 TI Xtrail
30/Dec/2010, 9:27 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
Live feed
Blog
Friends
Miscellaneous info




Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
Reply | QUOTE
Re: Buzzing


quote:

dieseldave wrote:
There is no coolant travelling through the intercooler it is an air to air type.



Hi Dave,

Nissan stated that there is coolant running through the turbo system using that pump, so maybe the T31 diesel set-up is a bit different to others?


I have previously received the following reply from Nissan:

quote:


Hi Jalal,

There is a pump on these vehicles that pumps coolant through to turbo system on the T31 diesels.

The work shop is certain it runs after the vehicle is switched of but there is no separate thermostat controlling its operation.

The pump is linked into the standard cooling system so the only thermostat in the system is the one for the engine.




---

30/Dec/2010, 9:44 pm Link to this post Send Private Message MSN Blog
 
dieseldave Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL NEWBIE
 


Date Registered: 02-2010
TOTAL POSTS: 15
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


Jalaski, I think you got me wrong, I was refering to the intercooler. I agree with nissan that the coolant runs through the turbo on shutdown. It has no mechancial thermostat, that is only in the engine. AS can bee seen from the photo below of the water pump, it is only a electric pump that taps into the coolant circuit.
Image
I am going to experiment on a long trip to see if this pump's controller recieves a signal from the ECU in regards to the temperature of the engine.
I think it is a very important part for keeping the life of your turbo. I use electric water pumps on my other cars (with out a mechanical driven) for this exact purpose, of controlling the engine cool down after the engine has stopped running.
2/Jan/2011, 1:08 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
Live feed
Blog
Friends
Miscellaneous info




Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
Reply | QUOTE
Re:


Thanks Dave, that clears it up nicely.

---

2/Jan/2011, 1:29 pm Link to this post Send Private Message MSN Blog
 
Dieslndust Profile
Live feed
Blog
Friends
Miscellaneous info

X-TRAIL ENTHUSIAST
 


Date Registered: 08-2009
Location: Port Adelaide
TOTAL POSTS: 133
Reply | QUOTE
Re: Buzzing noise after shutting down the engine?


G'day Guys and Gals

Yes - Dieseldave is correct

Now on another associated point - Observe the location of this little pump, It is at the bottom of the engine bay fixed on the cross member frame right where the stones, rocks and other assorted hazards can hit it. If it gets damaged or broken in any way you will probably come to a halt due to coolant loss

Moral of this post - If you are going off road FIT A BASH PLATE

Cheers Joe

---
Joe & Jan
2009 TL Manual - Diamond White
Nudge Bar, Lightforce Spots, Tinted Windows, UHF Equiped, Fitted seat covers,Front bash plate,Dash matt, Towbar,Flat mirrors, Silenced Key Alarm, Custom aluminium rear sand slide plate, Provented
4/Jan/2011, 7:19 am Link to this post Send Email PM   Send Private Message
 


Reply




Page:
 1  2  3  4 





You are not logged in (login)

forum sticker
Back to top Back to top

Back to topfree website counters

<-- end container -->