Thread: ZD30 engines

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

Originally Posted by PhilipA

Willy the Toyota (mainly) mechanic in Mataranka

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.

Originally Posted by llandro

Just curious, but what is the bottom line on this excercise?
Knowing what my friend went through, 3 months waiting around etc., then a recon. engine installed, shot rid of it immediately after, what is Nissan really on about.
After all, its only basically a 4 cylinder block with pistons, a crankshaft and its ancillaries, lubrication system and fuel supply.
So what makes them so self destructive?
It has to be an out of control fuelling system, electronics not taking notice of what the engine EGT is doing, pouring on the juice when the engine can no longer take it.
In a previous life I ran gensets powering bush sawmills. Ruston Hornsby, Lister Blackstone, Mirrlees, N/A and turbo. Most around 400-700hp. In all cases each individual cylinder exhaust had a pyrometer to monitor the EGT. Keep the EGT's at the correct level and all is OK.
These engines ran up to 12hr. shifts, lasted years and years and all to do with (manual) engine management.
Thats nuff. will go and pat the old 300tdi now!!
llandro

I haven't seen an automotive engine standard with an EGT gauge, I'm sure there's one out there somewhere.
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.

Originally Posted by LOVEMYRANGIE

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.

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.

Originally Posted by Dougal

The nissan YD engines were out at the same time as the ZD, yet they don't have the same issues.

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.
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.

Originally Posted by LOVEMYRANGIE

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.
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.
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

Originally Posted by 2 rocks

Hi Justin
Will take a bit of sifting, but lots of info on here:

GU/GR Nissan Patrol - Patrol 4x4 - Nissan Patrol Forum

I joined before I bought the Disco...

Decided if I was getting a Patrol it would be a TD42T.

Having said that a friend towd a tralier from Perth to FNQ (Creb track etc) and back only recently traded on a 200 series (for the Kinetic suspension).
Cheers
Mike

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.

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.