Gu patrol whistling...cure

Submitted: Monday, Apr 07, 2008 at 14:53
ThreadID: 56399 Views:9328 Replies:9 FollowUps:6
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Thankyou to those who replied and gave advice a few days ago re noisy 3 litre down on power,well now it has been found to have blown a seal on the turbo allowing exhaust gas to escape giving a whistling sound.Nissan tells me the turbo seal is not replaceable but will supply new turbo at a discounted price of $1521 plus need to replace air flow sensor $280 and clean intercooler $80 <it is leaking an oily substance at each end...Overboosting ????? This is not warrenty as it has 230000k and is 2002 model.
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Reply By: kktdw - Monday, Apr 07, 2008 at 15:37

Monday, Apr 07, 2008 at 15:37
What was it whistling - "Mammy"? "Dixie" ? or perhaps - "The Road to Gundagai?"

Were you sing-a-longing as you drove?

Naughty Ken
AnswerID: 297189

Follow Up By: Member -Signman - Monday, Apr 07, 2008 at 15:59

Monday, Apr 07, 2008 at 15:59
Nah- it was probably whistling the Toyota as it went past !!

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Reply By: Member - Roachie (SA) - Monday, Apr 07, 2008 at 15:58

Monday, Apr 07, 2008 at 15:58
Sorry, but it sounds to me as though it could be getting ready to blow....... Many blokes who have had their 3L grenade go off have reported something similar occuring beforehand. It is often a intercooler hose that will blow off. There seems to be a pressure build-up somewhere (maybe the EGR valve), that then seems to send the wrong electronic messages to the turbo to wind-up the level of boost pressure. Something's gotta give!!!

If I owned one of these machines, the first accessories I would fit would be a boost pressure gauge and an EGT gauge.

They have a VVT (variable Vain Turbo), and if the vains get themselves into the wrong position because the puter is sending some garbled message, then get ready for a huge cloud of smoke out of the exhaust, followed by a sinking feeling as you sit by the side of the road, waiting for your friendly towie......

As stated, not trying to be a smart-a-rse, just telling it like it seems to be...... Suggest you get onto the Patrol forum.... oodles of info on there about these motors etc.

Good luck,

Roachie
AnswerID: 297195

Follow Up By: Leroy - Monday, Apr 07, 2008 at 20:09

Monday, Apr 07, 2008 at 20:09
egr only directs exhaust gas back into the combustion chamber. Doesn't increase preasure.

Leroy
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Follow Up By: Member - Matthew ,United Fuel- Monday, Apr 07, 2008 at 22:46

Monday, Apr 07, 2008 at 22:46
When the EGR valve is closed and there is a high boost demand that is when the noises occur because the pressure in the pipe from the rear of the exhaust manifold to the EGR valve increases and puts load on the gasket.

What happens is the top bolt on the EGR transfer pipe rattles out loosening the clamping on the gasket causing a squeeling noise.

MAtt
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Reply By: Member - Matthew ,United Fuel- Monday, Apr 07, 2008 at 17:48

Monday, Apr 07, 2008 at 17:48
This sounds very sceptical to me,we have seen a lot of these 3 litres making whistling noises and it is normally the EGR gasket on the drivers side or manifold gasket not "blown seal" on turbo.

Just be wary of what is going on but definately get the boost checked or replace air flow sensor as a precaution.

Matt
AnswerID: 297222

Reply By: blue one - Monday, Apr 07, 2008 at 18:49

Monday, Apr 07, 2008 at 18:49
pepper2,
I would get a second opinion as quite a few turbos whistle, listen to some trucks when you pass them.

Might only be the MAF if you have an oily substance in the intercooler.

Cheers
AnswerID: 297239

Follow Up By: Leroy - Monday, Apr 07, 2008 at 20:07

Monday, Apr 07, 2008 at 20:07
They're all oily in the intercooler and pipes.

Leroy
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Reply By: autosparky - Monday, Apr 07, 2008 at 20:56

Monday, Apr 07, 2008 at 20:56
maybe it needs a blowoff valve to take care of back pressure between intake and valve body when accelaration has stopped and turbo wsa under load?
AnswerID: 297271

Reply By: Bonz (Vic) - Monday, Apr 07, 2008 at 22:44

Monday, Apr 07, 2008 at 22:44
Mine does that when the exhaust is loose at the back of the turbo, look thru the passenger side wheel well and see if you can jiggle the exhaust you see thru there if you can theres your culprit
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AnswerID: 297303

Reply By: Member - Hugh (WA) - Tuesday, Apr 08, 2008 at 00:57

Tuesday, Apr 08, 2008 at 00:57
Hi Pepper2,

I replied previously advising Nissan thought mine was an exhaust leak (2003 3L). Went in today for warranty repair (100,000km) and found to be the gasket between turbo and dump pipe. They had none in stock and apparently new gasket has to come in from Japan (10 day wait). So now it's home still whistling. I'm going to ring around tomorrow as I find it hard to believe this gasket isn't available - maybe they are replacing so many. Who knows - maybe a new turbo...

I don't know if this is the same gasket gone on yours but I find it hard to believe it cannot be repaired. I figure mine needs to be factory part due warranty repair but in your case this must be available aftermarket, especially with companies selling bigger dump pipes, etc. If I were you I would certainly ring up some turbocharger/exhaust companies before shelling out $1500 for a new turbo that is probably OK.

Why does the MAF sensor need to be replaced? I know these are reportedly subject to failure but what diagnostics was done to confirm this.

I hope you get back on the road soon.

Regards,
Hugh
AnswerID: 297314

Reply By: Chaz - Tuesday, Apr 08, 2008 at 01:42

Tuesday, Apr 08, 2008 at 01:42
Hi Pepper2,

It sounds too much like a gasket leak rather than an oil seal. The oil in the intake is due to the ZD30’s poor crankcase ventilation system and very unlikely to be a turbo seal. Take the hose off the intake side of the turbo and check for excessive play in the compressor. The turbo will suffer when excessive oil gets into it.

Overboosting is common and usually causes intercooler hoses to pop off or split. In most cases the intercooler will leak out some of the blowby oil. Intercoolers won’t tolerate 25psi plus pressures for too long, but there is a cheap cure called a Dawes boost controller that would save many of these motors from destruction.

$1500 is the normal price for a turbo and I just bought a spare MAF for $215 (delivered to my door), so your dealer isn’t giving you any special discount prices.

As Roachie said, a Boost and EGT gauge is good insurance if you own a ZD30.
AnswerID: 297315

Follow Up By: pepper2 - Tuesday, Apr 08, 2008 at 08:26

Tuesday, Apr 08, 2008 at 08:26
chaz where did you buy the maf unit ????
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Follow Up By: Chaz - Tuesday, Apr 08, 2008 at 09:03

Tuesday, Apr 08, 2008 at 09:03
Pepper2,

I buy all my Nissan parts online from Nizzbits in Melbourne.

Email Annette at nizzbits@hotmail.com and she'll give you a quote including delivery, then just transfer the cash into her account and the parts will arrive in a day or two. They only deal in genuine parts and have always beaten dealer prices.
I'd get a quote on the turbo from them also if you need one.

Good luck,
Chaz
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FollowupID: 563346

Reply By: pepper2 - Tuesday, Apr 08, 2008 at 08:20

Tuesday, Apr 08, 2008 at 08:20
thankyou for your replies,the turbo has been removed and i can see where the exhaust gas has leaked out the dealer suggested replacing the air flow sensor as a precaution,the dealer said nothing showed on their diagnostic equipment.
Havent found anyone yet that can repair the seal/turbo
Can anyone suggest someone that repairs turbos or where to purchase new item.
AnswerID: 297325

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