3.0lt GU Patrols - Grenade Facts

[YNOT]

Thanks to YNOT for the detailed response on why people call some 3lt diesel motors "Grenades".

There are heaps of threads on other forums on the subject (sounds like you found some of them), but the early ZD30 engines fitted to GU series 2 had reliabillity issues and developed a reputation as a grenade that could go off with out warning at any time. Series 3 onwards are more reliable, but it still pays to take a few precautions to make sure they stay reliable.

Most engine failures seemed to be caused by fouling of the Mass Air Flow (MAF) sensor with crank case ventilation vapours, causing the sensor to send incorrect air flow data to the engine computer. This results usually in over fueling, raising Exhaust Gas Temperatures (EGT's) to dangerous levels, which melts pistons and damages other engine components. Air flow into the cylinders can also be reduced (by Exhaust Gas Recirculation (EGR) carbon combining with the PCV oil vapours building up in the inlet manifold. Reducing air flow to the cylinders makes the over fueling situation worse.

There is a series of modifications (engine saver mods) that can be done to eliminate the causes of these faults.
As Nisspat said, it's usually the 4.2 owners that call them grenades.

Tony

[old briney]

What are the mod's ? PLEASE

[patch697]

What are the mod's ? PLEASE

You'll find lost of info & step by step in this document posted in the DIY section the this forum. Link provided below.

http://www.nissanpatrol.com.au/forum...rence-Document.

Cheers
Paul

[nissanjorin]

You'll find lost of info & step by step in this document posted in the DIY section the this forum. Link provided below.

http://www.nissanpatrol.com.au/forum...rence-Document.

Cheers
Paul

Have tried to download the above but can't - message says I have to have 25 posts before I can access this document? Any suggestions?

[AB]

Welcome to the forum mate, I suggest you get 25 posts under your belt.

Put up an intro in the introductions section, post up your rig in the members ride section, join in some general chats, welcome some other new members and you'll have the manual in no time.

[Sir Roofy]

Thats correct
sit back join in get to know a few people submitt some pics
your 25 posts will be up in know time
heck you might even want to stay longer

[wnicko]

Is there anybody out there who is having usual 3.0ltr issues with the Series 3 and onwards. Looking at 2007/2008 model ute.

[YNOT]

Welcome to the forum wnicko, when you get a minute drop by the introductions and tell us a bit about yourself.

Series 3 onwards are very reliable with very few recorded engine failures. As with any make or model there have been isolated failures but they are few and far between. I have read a few reports of the CRD (Common Rail Diesel) engines being a bit heavy on fuel.

Tony

[wnicko]

Thanks for that Tony.
A bit about myself, well you wouldn't believe it but (you might) i have always owned LANDROVERS.
Now don't turn off your computer because i am just about to buy a 07-08 cab chassis 3.0Ltr CRD Nissan.
Why, because Landrover stopped making cab chassis in 1998 when they made the TD5. Shame.
Not keen on going back to free wheeling hubs, constant 4 wheel drive (cental diff) is the go. Never had any issues with Landrovers, i've had seven and built a Discovery. There are lemons amongst all makes.
Hope to have as good a reliability record from Nissan as i did from Landrover. Sometimes it's the owner and how they drive and maintain machinery.

[teleman]

I was under the impression that the grenading ZD30 problem was fixed in the GU series II. can anyone please confirm??? cause mines has had no issues.