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You have hit the nail on the head, EGT is critical with modern highly stressed diesels, and obviously these are sailing close to the wind ALREADY pushing over 2 tons along, so it wouldn't take much to hurt the little ZD30. I'm surprised they don't have an overboost fuel cutout like the Td5, this would've prevented Nissans problems from Day 1 I reckon.:(Quote:
Originally Posted by llandro
JC
I don't believe the highly stressed line.That is the most common tojo owner line but the 4.2 N/A engine only has 96kw but is moving 2.3tonnes where's the Tdi is 83kw moving 1.8tonnes so the cruiser engine is hauling more weight so is working harder.The other thing is Tdi's and Td5's are getting very large miles (mines got 404,000k's) and aren't falling over. Pat
Nice bloke, dealt with him a few times. Sometimes with Rover parts (when I worked in Alice) and most recently he serviced my work vehicle (LC Troop Carrier) when I passed through on a Saturday morning.Quote:
Originally Posted by PhilipA
I haven't seen an automotive engine standard with an EGT gauge, I'm sure there's one out there somewhere.Quote:
Originally Posted by llandro
They seem to do all the fuelling calcs on air/fuel ratio, maybe it's an ECU that can't deal with a sensor that's not working properly.
Maybe it's malfunctioning EGR, feed hot exhaust into the intake and your EGT's climb too.
The ZD30 is basically Nissans first attempt at making a diesel with full electronics. The RD28ETI in the Y61 Patrol was a half attempt and a bit of an electronic training ground. Its is sort of the first inhouse attempt at a diesel engine also as all the other diesels were made by UD, not Nissan.
Pat, the Patrol weighs in at considerably more than a Disco or deefa and the gearings are high in Patrols hence you need to put your foot into it to get anywhere with them.
This engine is fine in the Navara, but is undersized in the Patrol.
Regardless of the kW rating, its the torque output that counts and a six will churn it out with less stress than a four cylinder.
Also remember that they had to give it 4 valves per cyl, a turbo, intercooler and common rail to get it to put out that much power, resulting in more stress to the components. Being a diesel supplier, I see around 20 or so of these a year and all the problem engines come from Patrols, not Navara's.
The nissan YD engines were out at the same time as the ZD, yet they don't have the same issues.Quote:
Originally Posted by LOVEMYRANGIE
Here we have pathfinders/terranos with the ZD30 that have blown their top, it's not just a patrol thing. The Navaras here seemed to have a different spec (wastegated vs VGT turbos, probably not commonrail but I didn't look that hard).
The 4 valves per cylinder, turbo and commonrail are necessary to meet emissions standards, power levels are optional.
The YD is a different engine and is smaller than the ZD. The YD is 2.5L and ZD is 3.0L. I have never had a query on the YD at all so obviously there is a difference.Quote:
Originally Posted by Dougal
There have been some significant changes in the ZD since all the problems and they do seem to have sorted it all out.
The spec is different because of the application. Navara is NOT intercooled where the Patrol is.
And the Pathfinder is not to be confused with the Navara either. The Pathfinder only has the YD25DDTi or VQ40DE petrol V6 in Australia.
Am not 100% sure, but AFAIK, the YD was a UD built engine unlike the ZD.
Yes I know the YD is different, that's why it has a different model code.;)Quote:
Originally Posted by LOVEMYRANGIE
The YD came in two displacements, 2.2 litres and 2.5. Injection varied from electronically controlled rotary pumps to common rail with high pressure turbo and intercooler.
Doubt it was built by UD, it's a car motor that fits sideways in the front of a nissan primera.
They came out slightly earlier than the ZD (1999 is the first YD I've seen, 00 was the first ZD I saw), seem to have more power/torque than the ZD's and are more reliable.
Which makes a mockery of the highly stressed time-bomb rubbish that is thrown about these days.
The pathfinder/terranos here are JDM (I am not in aussie), they had ZD30's until the current model and I know two people happily driving them.
These are not the same shape as the YD25 or 4 litre V6 pathfinder
Yep i joined way back when i was looking for a new 4B after drowning my Explorer, all the reports from the Patrol forum and ExplorOz turned me off as well.Quote:
Originally Posted by 2 rocks
Justin, go to ExplorOz and do a search, there are 100s if not 1000s of posts about the ZD30 failures.
One account is a bloke who has a Toyota Turbo diesel in his Patrol now after blowing up his ZD30, he is "On Patrol (TONI Project)
Project TONI update @ ExplorOz
Baz.
That toni project Baz is talking about is a classic,the bloke raves on about how good it is,$25,000 and climbing on a vehicle worth $40 grand at best.There is another one about intercooling a Patrol T/D,$3000 and it produced an extra 6kw.Fools and their money. Pat