smoky td42...

[garett]

just want to know do all gq na td42's smoke above 2800rpm... like portable smoke screen. under load at most rpms.
not burning oil or using water. black smoke.
seems to run rich but no smoke at idle , i'm thinking injectors not spraying properly ( nothing has been touched and i'm talking for the last 25 years)
been running injector cleaner but no difference.

thanks for any info

[mudski]

The squirters are probably due for a change by now. Hows the injector pump? Could be on its last legs.

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[garett]

well it started leaking .... fixed that with one o ring. and no its never been out or opened. has always run some form of sulphur replacement.. but 500k km or so on the clock.

[mudski]

Yeah she's a bit long in the tooth by the sounds of it. Its fuel related your issue i think. Over fueling due to some old fuel components.

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[garett]

yeah i'm probably up for a new pump soon and injectors. things i didn't want to do ..... might just drive it for awhile yet and start saving.

[Clunk]

Would it be worth checking valve clearances first?

[garett]

ahh did that a month ago 0.35mm all of them. first time they were checked and didn't move em.
and have changed exhaust manifold more power no difference to smoke.
air filters are clean.

[sangersanger]

Having the same problem but only 100k on the clock. No smoke at idle, shudders a bit when pressing the gas too quick.

Thinking it's because she shipped from sea-level and is now running at 1500 meters elevation?

[Touses]

Having the same problem but only 100k on the clock. No smoke at idle, shudders a bit when pressing the gas too quick.

Thinking it's because she shipped from sea-level and is now running at 1500 meters elevation?

Hi bloke. I'll have a crack at yours.

Shuddering a bit. Not knowing if this is your first diesel,have to assume it may be.

The rev range and tourque created within that range will take a little run in period for you the driver.

It may be a case of you expecting the engine to behave in a petrol manner.

The torque in a diesel comes on differently and is less aggressive than a petrol, generally in a narrower band.

Staying, as much as possible, within the band, will greatly improve the performance, overall driveability and economy!

Diesels don't like to be babied! Drive it with a firm right foot in it's rev range. Labouring won't 'harm' them but idling for long periods will glaze the bore, where avoidable don't do it.


The sooty problem. Check out the two stroke oil thread in general nissan patrol chat. Give that a crack for a couple of tanks and monitor it.


Could be something to the sea level thing, really don't know. Upgrade your air filter? May need a hi flow filter in a lower oxygen situation? Check with the local diesel mechanic/spare parts store?

All I can come up with bloke. Hope it helps.

Cheers, Rob

[sangersanger]

All I can come up with bloke. Hope it helps.

Cheers, Rob

Thanks Rob!

Already replaced the air filter (Which was filthy) with a new K&N. Helped a bit, but not tremendously.

The shudder is isn't so much a slow start or hesitation but happens under load. It feels the same as if a fuel filter was partially clogged in a petrol engine, just a momentary loss of power. I notice this around 3500 rpm. I assumed it was too much fuel being dumped since this and the black smoke seem to happen at the same time- assumed the power loss was from un-ignited fuel?

Next thing I'm going to check is the Altitude compensation system, if it's there, will also give the 2 stroke a shot.