Nissan TD42 questions

[Pebbles]

Hi all,

Not sure if this is the right section, but I have a friend that owns a fully imported Japanese 1988 TD42 engine, that runs very poorly.
He was told that there are very strict pollution laws in Japan, and there are restrictor devices within the engine.

Has anyone had experience with these engines? and how can we remove these 'modifications'

 

[ForealBoreal]

http://www.patrol4x4.com/forum/

its a great forum and has a ton of tech information.
I don't really think the older td42s have much with emissions devices.
I could be wrong though.

 

[peteinjp]

You don't need to remove anything- im sure it ran great when it left the factory. And there are almost no emissions stuff on my Jdm td42- which is why it no longer legal for use in tokyo and other densely populated areas.

You either need to get a service manual and go thru the entire system (as it must be neglected to run so poorly) or take it to a good diesel mechanic.

Pete

 

[brownbear]

we have a nissan section. Moved here.

 

[Pebbles]

Gday,

Its runs well, but there is no power at all. It runs like a 2.8l Hilux. 3rd gear up a less than moderate hill. The owner claims it has been like this forever. Its a 1988 model, and only has 178.000 original ks on the clock.

He also says there is a more than needed emission control system on there, that came from the Japanese factory. Does anyone have experience with these engines?

 

[canucksafari]

Hi Pebbles. I am a few months late checking this section out and your thread here. Perhaps you already have it all sorted out? I have two Nissan Safaris with the Td4.2. There are lots of reasons why it could be running poorly. I am assuming that you have done the oil and air filters. Have you checked the fuel pick-up screen. They often can be fouled with algae. Clean it off and treat the whole fuel system with a diesel biocide if it is fouled. Next place to look is under the banjo fitting fuel inlet on the injector pump. There is a fine screen inside it - if someone has not removed it. They also can get fouled up. Fish it out with a dental pic and clean it if it is fouled. If none of those things are issues, then I would next look at the condition of the injectors. On the TD4.2, injector should be inspected every 100,000 kms. Usually all they need is new nozzles and the breaking pressure adjusted by reshiming. Worse case scenario could be a faulty injector pump. I would first start with having the timing checked. Most guys say they get about 250,000 kms on their rotary pumps before a rebuild. The inline pumps (more common on the European models) go for ever without needing a rebuild.

Hope this helps you some. If you have any questions, let me know. Cheers, John

 

[Pebbles]

Thanks for your reply John, these are good suggestions. This engine in particular is a Japanese import, and I believe it has something to do with the pollution controls there. Like I said earlier, its only done 138000. It should be running like a charm. I will, however relay your suggestions.

Thanks again.

 

[canucksafari]

You are welcome. I did my first injectors at 148,000 kms and they looked like hell - carbon fouled tips. Low kms in Japan often include a lot of idling and short trips where they never reach proper operating temps.

There is only one pollution control on a TD4.2 (depending on where it was sold in Japan) - and EGR valve. My 91 has it but the 92 does not have it. The fix for that is simple. Remove it and put a blanking plate on the exhaust manifold and another on the intake manifold. I have heard that the intake manifuld can be badly carboned up. It is likely worth it to get a new gasket and pull it off for a good cleaning. I am guessing you are in the USA. Parts for the engine can be had from a UD Truck parts desk and also from any Nissan Forklift parts desk.

The other issue could be with the TPS which is on the top of the rotary injector pump. Connect with Twinotter600 on Patrol4x4. He knows a lot more about testing it and setting it up correctly. If it is faulty, it is not a Nissan part. It is a Zexel part and can be ordered by any certified Bosch/Zexel fuel injection shop.