white smoke/smell only when hot on idle


Hi Newbie here,

I have a '92 Rocky bought it about 6 months ago, since then I had coolant loss, spitting exhaust on startup etc etc. Had the gaskets, cylinder head, glow plugs, timing belt + tensioner/idler bearings replaced + full service all seemed fine. Yesterday for the first time I did a proper long run on the motorway, and noticed when I stopped and the engine was idling that it was producing a lot of white smoke but with quite an acrid smell as well. It doesn't appear to be losing any coolant or oil at the moment (or have any coolant/oil mixing or bubbles in expansion tank) but I realise it may be too soon to tell. I am familiar with the usual coolant in the chamber kind of smoke as I had lots of it before the head/gasket were replaced! Although I'm not ruling it out entirely until doing a compression check when its hot, This doesn't feel like that + it's starting fine with no white smoke, just a puff of black when it first fires then no smoke after that. Is there anything else that would cause this smoking only at idle once the engine is hot? any advice would be greatly appreciated...I want to love this jeep but it is testing my patience!!



Turbo Knackered

If anyone else has this I thought I would post my findings, appears the turbo is knackered and is leaking oil all over the place which is ending up in the intercooler and the exhaust and burning off as white smoke with a pungent smell. I was getting a funny whirring rattly noise on accelerating which pointed to the turbo as well.

You're lucky the turbo

You're lucky the turbo wasn't leaking badly enough for the engine to run off the oil and rev itself to destruction! Once you've replaced the turbo, I can't see you having any more problems with the engine for hundreds of thousands of miles. As a rule these engines are pretty indestructible. If you haven't already, it would be a good idea to check the gear/trans box and diff levels.

I don't have a turbo model,

I don't have a turbo model, but I think I noticed something about the turbo being water cooled in the service manual, might be wrong though....

yeah I'm going to do a good

yeah I'm going to do a good check of everything after putting the turbo back, indecently does a rear LSD diff require special oil and therefore different from the front? any ideas what is recommended?

thanks for your replies

LSD in rear diff


Presume you are refering to a Fourtrak. Are you sure you have a LSD Diff fitted ???. If so, very,very rare, more likley an after market fitment. Come back to us on this subject !!!

I believe a special oil is required. I think 'assassin' made a post on this some time ago.

Take a look at these posts'


Edward (ews) '92 Fourtrak 2.8 TDX

cheers, I'll take a look at

cheers, I'll take a look at the posts.

I believe the rear diff is auto locking as when you jack the back axle and turn a wheel the other one turns the same way... is this correct. I got the info from this page:


where it says:

Quote:How do if I know if I have a 'Limited Slip Differential' or an 'Open Differential'?

Jack up the back end of your car and block the front wheels.
Making sure the parking brake is off, spin one of the suspended back wheels.Observe the results.

If the wheel on the other side spins in the opposite direction, you have a stock 'Open Differential' if it spins in the same direction you are a lucky bastard with 'Limited Slip Differential'

this must mean I'm a lucky bastard Wink

I believe it is the original diff, The Jeep was bought in Portugal but was originally imported from Holland. it's a F70 so basically a Fourtrak, all the parts I've got from fourtraks in the UK are identical, the only mod is a 2" lift using extended shackles.

... and yes the traction is exceptional, especially in deep shifting sand and soft mud.

Turbo failure

Usual cause is constantly failing to let the engine to idle, after working hard , or at hi revs,( a hot shut down). Let the engine to idle a couple of minutes or so, this allows the oil to still circulate through extremly hot bearings to cool them down. Failure to cool down the turbo will result in oil seal and bearing failure. Also failing to carry out regular oil changes does not help. ( Do not use Fully Synthetic Oil) Noticable whine, eventualy a screech from turbo, oil/diesel smoke, loss of power , oil deposits in compression side of turbo pipe work and intercooler. Possible engine runaway due to oil combustion.

Thought - White smoke , this indicates water, not oil. Not sure if the Fourtrak turbo is also water cooled. Some one I hope will come back on this point.

The DL series engine is well known for its longivity, many of these engines have been round the clock a numnber of times in Fourtraks, with out repairs, just regular maintainance and this engine design was used for many other purposes, such as generators, marine applications, ect, due to its reliability.

Edward (ews) '92 Fourtrak 2.8 TDX

Didn't know that, thanks. I

Didn't know that, thanks. I had a mate who's pretty knowledgeable question the oil they used when doing the service, as if that might have effected the turbo's quick demise, at the moment I can't get hold of the garage who did it and find what they used but I would rather be on the safe side even if it meant replacing it.

My first thought with white smoke was coolant, having just had the head + gasket done this made my heart sink. But this was quite different, very pungent and thick and turned anything held to the exhaust very quickly black. I kept an eye on the coolant level and didn't notice any change at all.

Anyhow, the old turbo is out now and the little turbine inside it noticeably buggered so it definitely needs to go, luckily I have a mate with a spare turbo from the same engine so I'm gonna drop that in today and run it for a bit keeping an eye on all the levels and hopefully the smoke will have gone. If there is still white steamy smoke I'll know then if I have another problem on top.

Turbo's on Traks are

Turbo's on Traks are generally not water cooled, this is why it is imperative to let them idle befire switching off, turbo's spin in excess of 100,000RPM.

Turbo's run on a thick bed of oil, and at very high temperatures, if the engine is switched off the turbo still spins, but has no oil supply. This has the effect of cooking the thick film of oil on the bearings, this forms a gum which builds up over time. This gum effectively stakes the turbo impellor, making it harder to turn which reduces power and creates some of this white smoke as it is not getting the cooling from the engine oil circulation.

Some models were fitted with water cooled turbo's, these are very rare and were only fitted as an aftermarket replacement.

I've just dropped the new

I've just dropped the new turbo in and it had 2 coolant pipes coming into the side and the oil one on top that comes out the bottom back into the engine, I assume that means it's water cooled as well? Along with the LSD diff that makes 2 rare things! I though the whole lot was just stock standard as comes on any fourtrak.

The new turbo and cleaning all the tubing and the intercooler seems to have solved the smoking problem, so all good I hope.

New turbo or reconditioned

Just had a quick look at Milner off road and japanese4x4spares and don't think they sell a new turbo. If you need a new turbo is the only option to get a reconditioned one?

And on a side note is there anyone else who stocks new Fourtrak parts?

EDIT : Quick note, how do I change the little american flag on my post as I'm from England?

You can get second hand

You can get second hand turbos on ebay but there is obviously a risk, I've always been lucky with getting bits this way, your experience might be otherwise. The other option is getting your current unit reconditioned, which for me turned out expensive here in Portugal. There must be loads of fourtraks breaking in the UK, I had a lucky break really having a friend that had a spare one.

re your flag, it's probably automatic from your IP address, if you're not posting from the states then the program has probably made a mistake, I wouldn't have thought you could change it.

Flag waving


The little flag at the bottom of your post, is a result of myself asking LuRcH if it was possible to set the site to indicate where posters were from,as the site has world wide interest. Also due to the differences in models of vehicles and version names.

The unfortunatly it uses your service provider for this info, hence you are using an American based one and you get a Stars and Stripes. It is an issuse that we are aware of.

Edward (ews)

Edward (ews) '92 Fourtrak 2.8 TDX

Turbo Cooling -: water

Hi all.

Just had a loock in my service manual.

Manual for F70, F75, F77. Cooling System section, page 3.

Turbo Charger, Cooling Water Route.
"The turbo charger is cooled by the cooling water which flows in the following route: cylinder block - turbo charger - turbo charger water bypass - water pump".

Pipe leaves water bypass hose, at the front of the block, then runs under the manifold to the turbo, two other pipes appear to be connected to the turbo, and the flow arrows appear to indicate a flow from the turbo to the water bypass hose, indicating water is taken from the block through the turbo and passed to the bypass hose/rad.

Hope this helps and suggest you purchase a service manual from LuRcH, top of page marked 'Service Manuals' very usefull items. Manual states a LSD could be fitted as 'Special Equipment'

In light of what 'assassin' states, their is no indication of water cooling of the turbo,if this was standard fitement or was a special/optional fitment.

Must have a look at mine,('92 Fourtrak TDX) never really looked, as no problems.

Edward (ews) '92 Fourtrak 2.8 TDX