Isuzu Trooper Owners Club UK™

[siweb]

After the new rocker arm was fitted we still got loads of smoke.
So back in my garage it went and off with it's head

But nothing has really stood out to be the cause of the smoke.
but the short list so far is injectors (have been tested and 3 off them are... well.... *beep*!) and the valve stem seals.



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[Google]

[jjcymru]

may i ask, off topic but what on earth is left of the turbo actuator bulb, the silver thing?

Is the smoke blue, black or white/grey?


are the rubbers of the stem seals tough?

[siweb]

I have no idea, but someone once said it had an exhaust brake?

Smoke colour very light blue but white/grey mostly

like this



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[siweb]

[jjcymru]

new ones rubber are springy and seal the oil efficiently, as they get older the springiness reduces and the rubber may crack..oil burnt.

Exhaust brake, could well be.. need a vaccuum off that to control gases to the exhaust, probably done a lot of towing before. Definitely not original.

white grey, awkward to diagnose. how does the engine run?

Injectors id attack first once if this is still the case after the head's been skimmed and the gasket of appropriate thickness has been fitted.

Check for a notch on your old gasket, your new one after skimming should be thicker, check out with your engineer as to how much hes taken off to ensure you maintain the right compression ratio with the correct thickness gasket.

[siweb]

The injectors will be ready Tuesday'ish cost £185 to have them all redone. Instead of a spray they had jets

The head gasket set is now here, I was told not the bother having the head skimmed as its sound, and was surprisingly clean.

The new steam seals look to have a smaller hole then the old ones so that must be a good sign.

All this work and never to be used on the road, I must be going mad
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[jjcymru]

christ thats dear, a place i know would do them for £25 each cash.

[siweb]

Thats just what our lass said

[jjcymru]

LOL, are you keeping standard nozzles or going up a size for performance inc?

[siweb]

standard nozzles i would think. my dad just give them to the bloke and said test em... and fix em.

[lesdecks]

About 20 years ago, I had a Reliant Scimitar 3.0l V6 which ran with loads of white smoke. I decoked the heads, renewed head gaskets and hey presto.. no change,.. still loads of white smoke.
The problem turned out to be, the brake servo diaphragm was split. This allowed the carbs to suck brake fluid from the master cylinder, through the servo vacuum pipe into the carbs and engine and burn it with... loads of white smoke. Dunno if this is your problem, but the smoke's the same colour !! might be worth a look, try disconnecting the brake servo vacuum hose, and starting the motor.
Good luck.
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'92 3.1 TD LWB Lotus
Isuzu Bighorn, The Best Value 4x4 By Far

[dani4JB1T]

Any tips siweb??...Im starting to open my engine this weekend. I think it needs new rings, piston and new cyl liners.

This will be the first surgery done by me on this engine.

cheers
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all you have to do to call
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and then smile and we'll understand

[Roscoe]

Hi Guys, For a start, An explanation on smoke colours in a Diesel

Black or very dark smoke, especialy under load, this is caused by overfueling, ie, a rich mixture and this is normally the only colour that will result from any injector problem.

Blue smoke means oil is getting into the combustion chamber from somewhere. (rings,stem seals, gasket etc)

White or light grey smoke means that diesel in its liquid form is reaching the hot exhaust system. This is normally caused by a cylinder that is too cold to creat combustion. (Aerobatic aircraft creat their white smoke by injecting diesel into the exhaust pipe)

The causes can be A: Poor compression for whatever reason.

B: Something is cooling the combustion down like a tiny coolant leak through the liner or via the head gasket.

Normally you will notice a complete miss in one cylinder and the smoke will tend to "Chuff" out the exhaust in time with the faulty clinder but not always.

As with everything, there are always variables but those are the basics.

Note, If a cylinder has been down on compression then it will normally show a higher buildup of carbon deposits on the top of the piston, valves and the head fire deck.

Cheers
Roscoe

[Roscoe]

Sorry Siweb, My last post was poorly written and I would have deleted it if I could.

Im going to post a couple of links to sites you will find of interest and will explain further ref exhaust smoke.

http://www.oceanmarineservices.com/Diesel%20Engine%20Smoke.htm

http://www.freeautoadvice.com/diesel/smoke.html

http://www.tpub.com/content/construction/14264/css/14264_208.htm

[siweb]