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GU engine diagnosis help!!

Tech Talk for Nissan owners.

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Posts: 113
Joined: Sat Jul 12, 2008 8:59 am
Location: Sunshine Coast

GU engine diagnosis help!!

Post by suggy126 »

The old man has a 2000 GU 3.0L turbo diesel.

Today driving up a hill on road the vehicle suddenly lost power and blew white/blue smoke, there was a bit of a clunk but it stopped pretty quickly, before he'd pulled over.

When iddleing the engine moves from side to side quite a bit like the revs are to low to run properly.

The water in the radiater is normal colouring and the oil in the sump isn't milky.
Has any one got any ideas what it's likely to be? I'm leaning towards stuffed turbo but i haven't had a chance to strip it yet (tomorrows job).

P.S. Before anyone says it i know a td42 upgrade is his best bet and i'll be pushing for it if it comes to it :D , but right now he wants to fix this engine as he likes it.

Any help or tips as to what i should keep an eye out for would be great thanks.
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Posts: 45
Joined: Thu Jan 28, 2010 7:46 am
Location: Narre Warren

Post by Dabbott »

White smoke ( unburn't fuel)
Blue smoke ( burning oil)

Id probably be thinking blown oil seal in turbo,
But causing it to "jump" from side to side could have something to do with fuel.

I am not too familiar on these engines but id check the turbo out first.

Hope all goes well :D
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Posts: 502
Joined: Thu Dec 01, 2005 12:09 pm
Location: Cairns

Post by fnqcairns »

Drain the oil, then strain it through an old T shirt or the like, being a 3.0 one almost has to consider a terminal illness.
*JUST LUV IT* 96 GQ LWB TD4.2, Cav, Kings, Dobinsons, Motorguard, Enginesaver, 400 pro, Cooper ST's (rolls eyes), fleetguard oil filters, Delo 400 engine oil, Delo ESI gearbox oil and an RTC.
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Joined: Thu Sep 07, 2006 10:51 pm
Location: Central Coast NSW

Post by Clanky »

Sounds a bit nasty. Especially with the 3.0L's reputation for melting pistons and the like.

While its idling remove the oil cap. If it blows like a steam train that would indicate combustion blowby to sump.

A compression test would be a good indicator of the engine condition.
I would check the valve gear runs ok and no damage.

If all this comes up ok, could be timing belt ( or are they chain in the 3.0?) slipped a tooth, Or a broken tensioner.

If it was a rooted turbo it would not affect the idling of the engine - unless the compressor side has disintegrated and been sucked down the intake. In which case the engine is probably damaged anyway.

Oh, and if you find out the engine has self destructed, you will need to find out why ( electronic injection sensors, turbo, etc) or you might damage the rebuild. I think the cost of these extra parts are one of the reasons they are expensive to build.
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Posts: 113
Joined: Sat Jul 12, 2008 8:59 am
Location: Sunshine Coast

Post by suggy126 »

If the engine is up shit creak i'll source a td42 engine and gearbox to suit and give the truck a better life. I'll definately be looking into why it's stuffed to.
The other i thought of is a stuck exhaust valve or stuffed ring as the smoke puffs out when it's idling like it's only one cylinder thats rooted, let the fun begin tomorrow either way, i know one thing for sure but, he won't be driving it to work on monday :finger:
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Joined: Sun Nov 18, 2007 7:12 pm
Location: Dont no

Post by msjc38 »

Missing & blowing smoke. Check blow bye out the breather it could have done a piston
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