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cheena
X-TRAIL NEWBIE
Date Registered: 09-2009
Location: Brisbane QLD
TOTAL POSTS: 30
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 Oil on the air filter and Oil Separator Leaks (T31 Diesel)
Hi,
I purchased a new Diesel T31 X-Trail Auto in September 2008. Within 4 months had my first problem of a strange noise coming from the engine. Every time I throttle back or take my foot off the accelerator, the engine makes a loose metal bracket/shackle vibrating noise. The sound develops only when the engine is under load, but no sound when the car is stationary. Dealer states this is due to the turbo waste gate opening, but I am not convinced as the sound developed after 4 month of use. If it is normal, then the sound should have been present from day one.
Then the EGR valve failed and the vehicle became very sluggish. Apparently engine oil is leaking on to the EGR valve and Nissan Japan is unable to figure out why? They said there are similar cases in VIC, SA & WA. The oil leak is so serious oil gets sprayed on to the air filter. Nissan temporarily replaced the EGR valve and the air filter, but advised me that I may have to bring it back for repairs when they find a solution for the oil leak. That I should keep a close eye on the oil levels and inspect the air filter every week.
After that the fuel gauge started to behave erratically. When the tank is full it shows three quarter and when the tank is half, the low fuel indicator lights up. The dealer said the fuel gauge problem was caused by fuel sender unit failure and replaced it. Furthermore, they told me that they have replaced many fuel sender units in various Nissan vehicles and it is a common problem with the Nissans.
Since I purchased the X-trail I have visited the dealer 8 times. This is very inconvenient and time consuming. The vehicle is good and serves my needs, but the regular problems are frustrating me.
What are your views?
Cheers.
Last edited by jalalski, 16/Jan/2010, 12:37 pm
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Cheena
2008 Diesel T31 TS Auto
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21/Sep/2009, 11:04 am
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Strange engine noise, oil on the air filter & erratic fuel gauge.
Hi Cheena,
The engine noise could be related to the EGR failure and the spray of oil in the engine bay.
After reading a post about a seized T31 diesel engine, the engine noise you're experiencing could by a failed or on the way to failure oil pump and this could also explain the spray of oil on the EGR valve.
I am astonished by the similarities of the previous T30 diesel defects and problems with the turbo diesel of a completely different engine and what you're reporting now and would have thought that Nissan would have solved these issues by now.
The only thing remains to be seen is turbo failures due these oil leaks, but a seized engine is even worse of a failure to have.
In regards to the fuel gauge problem, I wouldn't worry too much about that. There is something wrong with the sender unit Nissan Japan included on most Nissan cars and my wife's Tiida and a friend Navara had exactly the same problem as well.
Please keep us updated regarding the oil leak in your engine bay, as this is something that I personally haven't come across yet on other xtrail forum and/or community yet where the T31 diesel is available (especially in the UK where they had all these T30 turbo failures before)
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21/Sep/2009, 5:38 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Strange engine noise, oil on the air filter & erratic fuel gauge. (T31 Diesel)
That is quite a lot of oil spillage for sure! 
I wouldn't have accepted Nissan's so called "patch-up" maintenance solution and giving you the responsibility of monitoring oil levels and leaks. I would have left the car with them until they can figure out what was wrong with it or insist on a new car being given as replacement if they can't find an answer. This is simply un-acceptable with a brand new car and no owner should go through that and put-up with it.
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22/Sep/2009, 8:59 am
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6249
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Re: Strange engine noise, oil on the air filter & erratic fuel gauge. (T31 Diesel)
On the M9R diesel engine, there is a PCV hose which connects to the intake tube near the air filter.
This PCV hose comes from an oil separator unit on the top of the engine.
I am wondering if the oil separator is faulty if excessive oil is being sent down the PCV hose and finding its way into the air filter box ?
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog |
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22/Sep/2009, 11:17 am
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Strange engine noise, oil on the air filter & erratic fuel gauge. (T31 Diesel)
Hi Cheena,
Kev is spot on with his comments.
I did some research about the oil on the air filter and it seems it's not new to Nissan and the T31 diesel.
You need to ask the dealer to replace the oil seperator which is an integral part of the top of the engine.
The seperator forms part of the breather system, seperating the oil from the crank case pressure that is developed by the engine when it is running.
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26/Sep/2009, 5:21 pm
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...if it is failing already, I reckon it probably needs to be be part of the regular Nissan Service "empty and clean" if possible.
