4.2 TD Nissan Patrol Overheating

have you changed the hoses as they can get soft ands suck in and restrict water flow

steve

I have same model with aftermarket intercooler on front of radiator, and found it got warm/hot underload. Flushed radiator cleaned and airblasted all rubbish out of cooling fins and still warm. Then removed driving lights from bull bar, and cut a couple of extra holes in bull bar for air flow and that helped heaps. Also the temp guage is not the most accurate in the world, so put in cluster of guages including temp guage and found reading was cooler well in the norm. If you have any further queries u r most welcome to call

If you are having problems with at speeds aas low as 70 then you have a serious problem. But the solution could be as simple as a good fuel systemm service.

I had similar probs on the old GQ. Had the fuel pump serviced, cost an arm and both legs, it did nothing.

Head off and serviced, new radiator complete flush of cooling system,new coolant and still no perceptable improvement.

I was set to sell the old girl but couldn't afford a replacement. I finally took it to a diesel specialist in the Southern Highlands of NSW. I once had a post removed when I mentioned this particular workshop so I won't include the name, but they advertise in the major 4wd mags. I had a pleasant day out, they did fix the problem and for a reasonable cost.

I understand your frustration. I had people tell me that fuel was definately not the problem which is why it took me so long to find. It was a fuel problem. The whole system needs to work together and be serviced together to get the bvest results.

Good luck
Duncs.

Have you checked the viscous fan? It may not be sucking enough air through the radiator.

I doubt this is your problem but here goes. I had overheating problems with my GU TD42. IT only happened when under big loads going up hills so not major. IT began when I cheanged from 15W 40 Castrol RX super to Penrite 20W 60. Living in a hot climate, I took this move as the manual recommended 20W 40 or 50 oil. Anyway, shifting back to 15W40 I had no further problems. The thicker oil was the problem. Might be a help.
Cheers, Mark.

Try the Outer Limits site,
Then go into the Nissan section and ask. I am sure someone there can help.
www.outerlimits4x4.com
It seems that the Gu 4.2td has a problem when worked hard on hot days.
I also think you may have a fuel prob, may need a good tune up etc.
Just a thought.
Let us know how you get on.

Had the same problem with my 4.2 TD.
After lots of investigation and expert opinions about fitting larger radiator etc we found that the lower radiator hose was the problem.
Hot engine + revs and the hose sucks flat near the bottom.
You can check this by pulling over when the engine is overheating being sure to keep the engine revs high.
Get someone to look at the hose.
When the revs drop the suction from the w/pump reduces and the hose re-expands.
Cure is to insert a spring inside the bottom hose.

Hope that this helps.
Bob

Make sure you have a " High Flow " termostate installed not an off the shelf one. you need 77 deg one. This should fix prob let me know.

I've had this problem twice in the last 15 yrs with my 89 Maverick TD4.2.

Solution in both cases was:
(1) Clean radiator (once had to be soaked for a day to get the clay out of it).
(2) New viscous coupling for radiator fan (get the Nissan one).

Fine after that.

( I was overseas for 2 years and the truck was in storage which probabaly contributed to the second coupling going).

Cheers
Tom