Smoke from cold engine misery - a solution?

[lynall]

Just guessing thats the bosch ve pump?
If so loads of info on the web, its fitted to many old landrovers and the yanks have it on their cummins b6t engines and they know all there is to know ref tweaking and repairing them.
Some decent vids on youtube as well.

 

[Latestarter1]

Hi guys,

Maybe a fix for you too.... I read an interesting article some time ago that helped my friend get rid of his TAMD41B smoke.
http://www.capedory28.info/index.php?name=PNphpBB2&file=viewtopic&t=14
Good luck.

Gawd summary is total misunderstanding of how Bosch KSB functions, does not alter fueling quantity!

KSB = 'Kaltstartbeschleuniger' – German for “Cold-Start-Device”.

However there are two totally different types of KSB which work in entirely different ways. Not having any interest in Volvo engines have no clue what type of KSB 41B has.

KSB on Cummins B controlled by thermistor in air inlet.KSB works in conjunction with a thermistor sensor in the head. When the ignition switch is in the ‘on’ position, power is present at the thermistor. When cold, the thermistor sends power to the KSB solenoid, which opens the KSB.

Upon starting the engine, injection pump internal case pressure will advance the timing. Switched power is required for the KSB to open and function correctly, and will turn off when the thermistor sensor warms up and opens removing power to the KSB. If unplugged, the KSB will simply not function, which will only make a difference at low ambients. Under 32 Degrees C voltage is applied to the solenoid, blocking the fuel return path, and using internal pump fuel pressure, advances the timing slightly. Over 32 Degrees C no current is applied to the KSB solenoid, fuel is allowed to return via the normal operating fuel path. The timing advances normally through internal porting, and sliding plunger.

The solenoid operated KSB works instantly when you connect & disconnect the voltage to it, when it is working you can hear the engine speed pick up and drop off connecting & disconnecting it.

 

[volvopaul]

The 41 series motor has Bos ch VE pump, no cold start device fitted just a boost controlled smoke limiter which if played with can cause poor acceleration or excessive black smoke , unless it's seized up leave well alone , let the pump shop sort it.

The reason this series of engine smokes is the compression ratio, but like the old Fords, too much fuel at low rpm and too low a CR makes white smoke un burnt fuel. Not much you can do although about a year ago I worked on a 41 that had some kind of fuel warming device inline just before the pump, on cold start it really worked as the old 41A series is not an easy starter in cold weather when it's getting a bit worn on the valve seat dept. He turned these heaters on and boy was there a real difference.
Of course it's cold fuel you want for performance , Volvo only just got round to fuel cooler when the D4/6 came along with common rail.

 

[Montemar]

Many thanks for the wide range of answers and solutions.
The engines only smoke when cold but run well when at normal temperature.
What was interesting was heating of the diesel as this could be easy to do. This could then be switched off for more power when the engines are warm.
I have not looked too closely but feel that the exhaust, when cold, is bluish which suggests oil rather than fuel is burnt. It seems likely as clearances will be greater on a cold engine so engine oil could make its way in though oil consumption seems very low. I will check this out.
Paul, I have considered the injectors but feel that engine performance indicates no major problem so far.
I will check the effect of heating the calorifier to maximum and letting its water heat up the starboard engine compared to a cold port engine and report back.

 

[omega2]

Hi guys,

Maybe a fix for you too.... I read an interesting article some time ago that helped my friend get rid of his TAMD41B smoke.
http://www.capedory28.info/index.php?name=PNphpBB2&file=viewtopic&t=14
Good luck.

Bet you could not get your FORDS to behave though??

 

[lynall]

Many thanks for the wide range of answers and solutions.
The engines only smoke when cold but run well when at normal temperature.
What was interesting was heating of the diesel as this could be easy to do. This could then be switched off for more power when the engines are warm.
I have not looked too closely but feel that the exhaust, when cold, is bluish which suggests oil rather than fuel is burnt. It seems likely as clearances will be greater on a cold engine so engine oil could make its way in though oil consumption seems very low. I will check this out.
Paul, I have considered the injectors but feel that engine performance indicates no major problem so far.
I will check the effect of heating the calorifier to maximum and letting its water heat up the starboard engine compared to a cold port engine and report back.

You cannot always go by the colour of the smoke.
But have to say I wouldnt be doing anything else until I had the injectors checked,