Overheating GU's

Thanks for the reply Trevor,

I guess when you think of it not much has changed by adding the intercooler - still the same donk. I think Roachie is right, sounds like the water jackets are just too small to get the heat out of this big lump of cast Iron.

Sounds like these things are fine without a load on and if I wasnt going to tow my 1.2t camper trailer I wouldn't hesitate in buying one for a second. The last thing I want is to be getting my left ear chewed of by the minister of finance because we're stopped on the side of the road letting the thing cool down in the Territory somewhere! LOL

Cheers
Chris

The other thing that is quite different between the 4.2TD (like Trevor's and mine) and the newer 4.2TDi is that the turbo on the newer ones is a "dry" type....(ie: it is not water-cooled). Stuffed if I know whether this has anything to do with it running any cooler, but now that mine is no longer water-cooled, it does seem to take a little bit longer (or slightly hotter weather etc) before the gauges start to climb. But that comment itself is VERY objective.....there is no relaible way I can really compare the before and after performance (temperature-wise) of the truck now that I have the new turbo bolted on. It seems to rev more freely & spools up to 15psi (on those rare occasions when I make it do so).

There is no way I would run a modified truck without an EGT gauge, extra water temp gauge and a turbo boost gauge......you MUST know what is going on under the bonnet.

Cheers

Roachie

Chris,

I have seen the water jackets in this 4.2 Nissan side by side with a 4.2 Toyota donk and they are cheese and chalk, with the toyota bigger by a country mile. I honestly believe this is the main crux of the problem. But we do have to give it to the old Nissan donk as they just seem to keep running. I won't tell Nissan that last bit as I think they should have done a more thourough job in testing the 3.5tonne towing capacity in Australian conditions, I believe the towing capacity is more like 500kgs in my opinion.
I am led to believe they have to replace the ageing 4.2 donk in the Nissan to meet emmission laws being introduced in 2007 ?? so next year may be the announcement of it's replacement (again not sure on the facts about this, just rumour at this stage). This may come in good time for your replacement ??

Cheers Tevor.

G'day Andrew,

No arguments here I have the same vehicle as you and have never had a cooling issue. However the next vehicle I buy I plan on keeping for quite some time. This is why I have targeted something all cast Iron like the TD42 Nissan or 1HZ/1-HD-FE? Toyota.

I know the series three 3.0l patrols are supposed to be more reliable, I still worry about mine lasting the distance not to mention the sheer lack of off Idle torque. On one of our club outings I was in a creek bed 1st gear low trying to climb up a steep exit slope the little 3.0L just kept stalling even with the right slipper planted to the floor - The end result was some clutch riding to get the turbo spooled up and she eventually climbed out. (doesn't help running 33" tyres with these things either)

Cheers
Chris

Cheers
Chris.

Thanks to all you guys for the feedback.

Keith,

Have you driven up the toowoomba range on a hot day with your camper in tow? and did the temp gauge move at all?

I was led to believe by a friend who works at a major diesel service centre in Brisbane that the gauge should not move once up to temperature no matter what the conditions are. I can say this is the case with my GU 3.0L and my HZJ75.

Thanks
Chris