isuzu diesels

**KhunMoo** · 20th November 2007, 01:26 PM

Paul, my 4BD1 used to blow a fair bit of black smoke cruising on the hwy. In June I dragged a 3ton trailer for 2,600km from Derby to Alice ... heaps of black smoke and I had to wring everything I could out of the old oiler (370,00km). From Kununurra onward I started adding Nulon Injector Cleaner to the fuel and by the time I got to Tenant Creek it was roaring along beautifully with very little grey smoke and pulling the load comfortably. It now runs well with a little bit of grey smoke under hard acceleration. I put the big improvement down to two things; a) the injectors needed cleaning and b) I reckon the cyclinders may have been a little glazed from years of light work pulling a 110 instead of a loaded truck. The really hard work for 6 days straight clearly sorted that out.
This Xmas I'm doing another trailer trip, this time ASP to Adelaide and will bung in some Nulon again. From Adel to Vic high country and back I will be running home brew bio-diesel, so I will be really interested to see how that goes.

Personally, I think the 4BD1 doesn't slog hard enough in a 110 to keep it happy. Mine spent many years of its early life with the original owner dragging horse trailers and that probably a good thing. A better fit for the vehicle weight would be the later 4BE1 (3.1lt I think).

JohnS (khunmoo)

**OLR-067** · 20th November 2007, 02:06 PM

Cheers John,
I was figuring it just needs to be worked harder. I started last week to add nulon cleaner.Just seems to blow black under acceleration, seems to be down on power a little too.Anyway, I'll see how it goes and try and find some hills.Might be time to go bush.

Cheers
Paul

**Dougal** · 20th November 2007, 02:56 PM

Originally Posted by OLR-067

Cheers John,
I was figuring it just needs to be worked harder. I started last week to add nulon cleaner.Just seems to blow black under acceleration, seems to be down on power a little too.Anyway, I'll see how it goes and try and find some hills.Might be time to go bush.

Cheers
Paul

How's your aircleaner? Black smoke and loss of power points directly to that.

**Dinty** · 20th November 2007, 08:02 PM

G'day All, Paul stop worrying about it, pedal to the floor will make black smoke, mines got a heap of klicks on it and it makes bugger all smoke even with right foot flat to the floor pulling hard, mine had the injectors done about 10 years ago, and just regular servicing since, I don't subscribe to so called injector cleaning additives, anyway bound to get some flak cheers mate Dennis

**justinc** · 21st November 2007, 12:06 AM

At 490k and turboed with never having yet had the injectors serviced, I get a small amount of greyish smoke on full fuel, I have minimal blowby and suspect that a rebuild at the moment is a complete waste of my $$$

I love these engines.

JC

**paulthepilot_5** · 21st November 2007, 06:46 AM

ok thanks for that i will stop worrying about it

Just one last question, i went to get a new thermostat from ISUZU yesterday, and they do not have one that is the same temperature as the one i took out (which was 76.5C) the lowest one they have is 82C. I have a bit of a feeling that the one i took out of my 4BB1 may have been too cold, as the water temp has never run over about 82c even when working hard on a 40c day. Could this higher temp thermostat cause any problems?

Cheers

**paulthepilot_5** · 21st November 2007, 07:19 AM

Forgot to mention in my last post, My engine dose blow some grey smoke on start up until warmed up, then just a little whilst running. It has not ever realy blown black smoke under load, just more of a grey colour. Could this be a sign of the engine not quite running up to teperature. I dont think it is burning oil, as the oil consumption is very low.

**DRanged** · 21st November 2007, 07:36 AM

Originally Posted by paulthepilot_5

Forgot to mention in my last post, My engine dose blow some grey smoke on start up until warmed up, then just a little whilst running. It has not ever realy blown black smoke under load, just more of a grey colour. Could this be a sign of the engine not quite running up to teperature. I dont think it is burning oil, as the oil consumption is very low.

Pretty sure mine is around the 80 deg mark and runs fine on a hot day with the air con on. Cant see upping it by 5.5 deg from your old 76.5 being a huge problem.Isuzu would'nt sell it otherwise.

Justin

**dobbo** · 21st November 2007, 09:07 AM

Originally Posted by paulthepilot_5

Forgot to mention in my last post, My engine dose blow some grey smoke on start up until warmed up, then just a little whilst running. It has not ever realy blown black smoke under load, just more of a grey colour. Could this be a sign of the engine not quite running up to teperature. I dont think it is burning oil, as the oil consumption is very low.

My little 2.25D does the same thing I thought it was caused by dodgy glow plugs. Clears up on normal running temperatures

**Dougal** · 21st November 2007, 09:33 AM

The only way I can make my 4BD1T heat (that's heat, not overheat) is to thrash it up a skifield road.

We're talking 1500m vertical in about 20 minutes, pulling 4th gear in some spots.

My temp needle does follow the fuel guage needle (thanks LUCAS), but the engine temp is rock solid.

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