The Mitsubishi Pajero Owners Club®

[Hardcore_Shad]

Hi all!

Your comments & suggestions would be most appreciated...

I just finished the rebuild of my 2.5 4D56T 3 weeks ago.  Took it out for a break in trip this week and got a good 500kms on it.  Will be doing an oil change this week.

The rebuild was a success but there is one concern that I am not able to address: white smoke during acceleration (almost not visible at idle)
-  The injectors & injection pump are newly calibrated
-  Timing set to the 0 mark
-  Has the thermostat
-  Intake manifold originally has no EGR fitted
-  Checked all the glow plugs and all are working
-  new fuel / air filters
-  new fuel lines / hoses (except for the return hose)
-  aircon is working perfectly
-  engine temp is controlled by the thermostat (there used to be no thermostat)
-  No diesel / oil contamination in my coolant (as water / coolant is still same color)

* White smoke persists even after 3hours of continuous driving
** One of the temp senders is not wired (one closer to front cover with single connection) - as the harness does not have a wire for this, but clearly this should be connected somewhere.  Only the one further from the front cover is wired.

Engine could be running lean as white smoke (faint) comes out of the valve cover now that the rings have not yet properly set.

I have not cleaned the inter-cooler yet... but if that was the prob, black smoke should be the case.

Your thoughts please...

TIA!

[Google]

[Hardcore_Shad]

Just an update... The white smoke is actually bluish... Head is ok.

I cleaned the catch can, intercooler, and checked the turbo. All ok in that avenue.

I also rechecked the timing and belts. All ok in that department.

Now the paj runs quieterand has 50% less smoke than before and runs with more power.

Although the smoke has lessened and some power brought back, i still see 20% smoke on acceleration and 5-10% on a 1200rpm idle. I set the idle higher and will revert back to the original rpm after breakin.

Is this normal on the paj to have blue smoke  during breakins?

I am not lsing oil either, but mileage is still not that efficient.

[fattyfattyboomalatty]

did you check to see if yours has the gauze filter in the rocker cover?

[Hardcore_Shad]

Hi fatty.

The one i have has the double layered sheet metal covering the direct path to the breather.

The air flow is strong at this point so it might not have the gauze filter.

Tried poking it...as the sheets cant be taken off. - cudnt feel any filters there.

And i cleaned it thoroughly during the rebuild.

[Hardcore_Shad]

Just got back from a 2 hr run on the paj...

Uphill does produce blue smoke. On hard acceleration, i do get 90-100% blue smoke. It would look grayish in the shade but when sunlight catches the smoke, it is blue.

I checked the temps of each exhaust port:
- c1 137*C
- c2 128*c (had a hard time getting a reading as the turbo cover only left an inch window for the infrared temp to have a view of the manifold)
- c3 140*c
- c4 139*c

The paj runs with power and idles very well. Blue smoke is 10-20% at idle.

It starts easily too.

During the rebuild, i only changed and lapped the valves as the guides were still within measurement, new valve seals too.

This has me stumped... Will be checking the intercooler in a while to verify if it caught smoke after yesterday's clean.

The catch can shows no sign of oil deposits at the window tube.

Mileage from rebuild is 900kms.

[Hardcore_Shad]

Update:

I was keen to determine if the turbo was the prob so i disconnected both the feed and intake hoses of the turbo and ran the 4d56 for a few blocks. Behold! Very little trace of blue smoke. Mostly black as a normal aspirated diesel would put out on load. And at idle, there was no smoke at all.

Note: little oil trace on intercooler hoses unlike before the intercooler cleaning.

I had less pull but only 5-10% smoke. It was a noisy run but a necessary one. But this couldnt be the setup unless i permanently take the turbo out, which i dont want.

So my next cancelation step was to reattach the turbo and detached the catch can hose going to the filter inlet pipe. I just ran that hose down the chassis as the oil seems to be coming from the catch can hose.

Had much to do today and wasnt able to clean the air passages that i already cleaned yesterday. For sure there are still oil traces there since running the paj without the breather connected (but with turbo) still produces smoke - 30-40% on load.

If the residues clear out and this goes away, then it is surely the breather hose thats the cause. Im ruling out the turbo as i idled on high revs with the intercooler detatched and the turbo didnt put out oil. There is freewheeling and with very little to no play on the shaft.

[Hardcore_Shad]

[REVOGEL]

Excuse the  puns But I think it means a New POPE has been elected  

[Hardcore_Shad]

 not quite yet! Haha!

I just finished dismantling the valve cover and to my surprise, it didnt have the gauze filter inside. On naturally aspirated engines, this kind of baffling is alright but for turbo fitted engines, there should be some kind of baffling filter installed to minimize oil leaving the breather hose port, just like in bmw engines.

Will try see if a filter mod can be done on the valve cover and will post some updates on the mods section, with the link to that thread posted here as well.  

Btw, thanks fatty for hooking me up with this department as I wouldnt have thought of checking for a gauze filter in the cover had it not for his suggestion. Cheers!  

[iworkszim]

how did u resolve this please I have the same prob

[iworkszim]

[quote="Hardcore_Shad"]  not quite yet! Haha!

I just finished dismantling the valve cover and to my surprise, it didnt have the gauze filter inside. On naturally aspirated engines, this kind of baffling is alright but for turbo fitted engines, there should be some kind of baffling filter installed to minimize oil leaving the breather hose port, just like in bmw engines.

Will try see if a filter mod can be done on the valve cover and will post some updates on the mods section, with the link to that thread posted here as well.  :

how did u solve this

[Conss04]

Did anyone fix this problem