Blue smoke....

Just driving down a hill in the landcruiser 80 series in low range, second gear. Heaps of blue smoke out the back, changed up to drive and it was better but still there. Got home and had a quick look, plenty of oil but a few bubbles in it, plenty of water in radiator, and transmission fluid. Seemed like choke ws on but nope checked that and it's working. Had a new head and top end replaced last year so not to worried about the bubbles in oil.

Anyone got ideas as to why a diesel will start putting out blue smoke all of a sudden?

I've always thought blue smoke was buggered piston rings. I'm not a mechanics left nut though.

Hmmm could be, would have thought they were checked when they did the new head. Going to town next week for transmission service and a few other things... Guess it's going to the garage as well, bloody things starting to be a money pit

might have sucked oil in through the turbo

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Originally Posted by Martin358

might have sucked oil in through the turbo

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No turbo, 4.2l diesel with three speed auto. Wish It had a turbo!

Injector pump issues?

Crankcase ventilation system?

How steep was the hill you were going down, off road?

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Originally Posted by Fireflite

How steep was the hill you were going down, off road?

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Gravel 2Nd gear doing 20km/h not too bad at all. Prefer driving it down than braking all the way.

Above ideas are past my mechanical knowledge to fix. Guess it going to the doctors....

Sucked a smurf through the airbox, happens all the time

Is it still blowing smoke while driving along flat roads ?

so , if you ever follow cars down a long hill and at the bottom the accelrate away they blow blue smoke (burnt oil) , when you are using the motor to slow your descent or labour a bit harder , you can draw oil past the guides /valves , ... especially on older cars , ... i wouldnt worry about it unless she is blowing all the time , it happens to most cars after a descent ... watch the cars in front of you next time ....

Just make sure you check the oil reguarly and keep driving it. Pretty normal for an older engine.

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I'd say the rings are tired, valve guide seals should've been replaced when you had the head done. Like @veitnamcam says, to fix would be big money.

Start to worry if it gets bad enough to run the engine and you have to stall it with the brakes[emoji106]

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1hz? Don't worry about it, just keep oil up to it [emoji106]


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My old 4.2 turbo diesel will smoke like that. I've found different brands of oil give varying degrees of smokiness as the k's get near towards next oil change. I don't like the oil they use at those "oil changers" (Delco??) it was smoking in no time

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Originally Posted by 7mmsaum

Is it still blowing smoke while driving along flat roads ?

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Unsure will find out on monday

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Originally Posted by SiB

My old 4.2 turbo diesel will smoke like that. I've found different brands of oil give varying degrees of smokiness as the k's get near towards next oil change. I don't like the oil they use at those "oil changers" (Delco??) it was smoking in no time

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Suggestion on oil to use then? It's due a change, have a 10litre of valvoline 15w 40 lying around I was guna use

The valvoline will be fine seeing as you already have it

Mobil Delo will give you good protection as well

Haven't used valvoline so I say try it!

It's not drinking 5L of 15w like my 3 yr old Skoda did every two weeks so I think you're fine mate. :wtfsmilie:

Yeah I think it's the draw sat the rings you're getting under load down hill. Just monitor your oil usage.
Eh @northdude ! Being a mechanic you'll have a better eye on his.

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Originally Posted by 223nut

Hmmm could be, would have thought they were checked when they did the new head. Going to town next week for transmission service and a few other things... Guess it's going to the garage as well, bloody things starting to be a money pit

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You want me to send my boys around @223nut.

They'll have some cash in their pockets ;)

Cheers
Pete

Blue smoke is generally, burning oil, ie worn engine components, turbos seals, rings, valve guides,
white smoke is either burning coolant or water, or possibility incomplete combustion, ie a rag in the air-intake, no air, raw unburnt fuel.
Black smoke is over fueling, poor combustion, or starving for air, ie plugged air filter, poor injector or fuel pump, failed turbo.

This applies for the older, non common rail engines, the new electronic bastards, tend to reduce and delay fuel so even when something is failed, may not show any black smoke.

Went for a drive this arvo, no smoke once out of low range. Changed oil anyway and been for a 2 hour drive (to get a pie...) no problems. Cheers for the help guys, think it must have sucked a bit of oil somewhere or just working a bit hard in low range engine braking, first time it's done that though.

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Originally Posted by 223nut

Went for a drive this arvo, no smoke once out of low range. Changed oil anyway and been for a 2 hour drive (to get a pie...) no problems. Cheers for the help guys, think it must have sucked a bit of oil somewhere or just working a bit hard in low range engine braking, first time it's done that though.

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It is quite normal when engine braking for long periods.
Piston rings are forced out against the bore to seal by firing pressure of the power stroke, so no power no rings being forced out against the bore to seal and scrape the bore clean hence when you put some load on the engine you get blue smoke for a breif interval till the oil that has worked its way up past the rings is burnt off.

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Originally Posted by Carpe Diem

It's not drinking 5L of 15w like my 3 yr old Skoda did every two weeks so I think you're fine mate. :wtfsmilie:

Yeah I think it's the draw sat the rings you're getting under load down hill. Just monitor your oil usage.
Eh @northdude ! Being a mechanic you'll have a better eye on his.

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ok heres whats going on from what youve said without seeing the vehicle its sucking oil down the inlet valve guides when theres high inlet vacume ie valve guide seals are probably a bit hard but no doubt some expert will have a more scientific idea that they read off the internet or possibly pcv valve but the first thing i said would be it

Everyone loves that two stroke smell. Turbo in my truck is about poked, oil getting past the seals and blows a bit of blue under boost conditions, must get onto that!

Edit: probably due to giving it death in the snow, not that I would drive like an idiot eh @223nut.....

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Originally Posted by Ryan_Songhurst

Everyone loves that two stroke smell. Turbo in my truck is about poked, oil getting past the seals and blows a bit of blue under boost conditions, must get onto that!

Edit: probably due to giving it death in the snow, not that I would drive like an idiot eh @223nut.....

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no idea what your talking about.... what with the quad on the back, made a nice pendulum