Nissan B14 2.0D

[Dani80pk]

Read your whole thread post by post,and i feel now you might have become half mechanic visiting them again and again first in case of your previous ride and now for this one.
Great stemna.
I would have wept badly if i had to do your job.

Yar my mechanic is like my friend too and at 2min drive from my home so dont feel bothered. The only thing that bothered me is time that i had to kill there. Anyway I believe that if i gain something out of those spendings, I am better off.

[Dani80pk]

Can any body tell me what is the difference between conventional diesel engine and CDI Diesel Engine. Also, are diesel engines available in EFI configurations. Thanks

[Xulfiqar]

diesels are split into two basic types
direct and indirect injection

direct injection have the combustion chamber bowl in the piston itself where fuel is fed for ignition (usually very noisy if mechanical but quite easy to start - and less pumping losses as the fire does not have to pump itself out of a precup in the head)

indirect injection like your CD20 uses a pre-combustion chamber where the compressed air is forced into a tornado like ball and then sprayed with fuel making it instantly combust - which then comes out the throat of the cup and chases the piston down. (good and cheap design)

the CDI you are asking is about commonrail direct injection - the common rail direct injection is just like a petrol EFI engine BUT instead of the injectors spraying into the inlet manifold - the injectors are directly on top of the piston head. The injectors themselves are piezo electric units that inject at about 5 strokes of fuel for optimum fuel effeciency and quiet operation. The biggest difference is the injection pressure, the usual IDI engine fuel injection pressure is about 120-150 bar, the common rail DI pressure is about 1500-1700 bar (developed by a hydraulic pump on the engine itself) and the injectors are fired by the ECU

[Dani80pk]

Zulfi Bhai, Thanks for the information. Just to update you, I had cleaned the pump but still having black smoke at about half throttle. Avg is improved but not much. Its giving 14-15km/l. In morning it starts on first key instantly with one heater but does missing for a few seconds with white smoke when missing. I have to push the accelerator slightly for about 10-15 sec then it becomes normal and smoke disappears. After that terrible heating incident, I could not find time to change the oil, which is although full till now with no signs of decreasing at dip-stick. Is this missing and white smoke are sign of wearing oil. I remember you told in a post that white smoke in diesel is sign of extremely cold weather but we do not have any such conditions in Karachi (this you know). Gasket is intact (as my mechanic says) and i believe in him because car is not heating up despite 50km/ day drive from tower to Aysha Manzil in jam pack traffic. Any idea why is engine missing with white smoke. While driving there is absolutely no missing and no smoke as well unless I rev it hard. thanks

[Farooque]

till xulfiqar is back, heres a possibility:

Could be that one of your glow plugs is faulty, due to which one cylinder does not fire up with the others, which eventually does but seconds after starting.
The white smoke is unburnt diesel, which disappears as soon as combustion commences.
Therefore, ensure that:
- all your glowplugs are in working order

[capsat]

- xulfiqar - Merc 1974 240D engine rebuild, can u help i pull her out from somewhere and bring to you.

[Xulfiqar]

first to point to is the glow plugs, second to point to is the injection timing - other than that there is no problem because you say it starts up fast in the morning (meaning it has got reasonably good compression)

[Xulfiqar]

- xulfiqar - Merc 1974 240D engine rebuild, can u help i pull her out from somewhere and bring to you.

nice - engine, slower than geological time but surely will last geological time. For me literally working on it wait for me to come back to Pakistan.

[Dani80pk]

Zulfiqar Bhai, need an advice. I was thinking about doing something with engine but thought it better to ask first. If I reduce the diesel flow to engine through max fuel screw and increase the idle rpm a bit to prevent engine from extra vibration, would this help in increasing the mileage. Thanks

[Xulfiqar]

I beleive your screw was messed around with - if you want to reduce fuelling that way - remember the tiniest of movement will affect largely - thats why this screw is set-up on a test bench and sealed. By tiny I mean this screw is set in measurements of 1/32 of an inch - or about in 10 degree increments/decrements. btw the screw works backwards - in = more fuel, out = less fuel.

The idle adjustment screw that you speak of is actually a residual fuel screw, it should be set in such a way that it does not affect the engine overrun characteristics - meaning the engine should feel to "compress within itself to reduce speed" when the throttle is released at any rpm above 1500

[Dani80pk]

Hmmmm. Thanks. I will try to work around this way and let you know how it behaves after adjustment. One thing to ask, what should be the indication that max fuel screw is at default setting? What should be engine condition that tells that setting is at optimum? By engine over run characteristic, I understand what you are trying to convey and can check it while driving. AND my question was by doing so, would there be any improvement in mileage? (One thing that i understand is that by doing so, car's pick will reduce considerably. Am I right?)

By the way, when are you coming back home???? Will bring this car straight away to you when you're back. Thanks

[Dani80pk]

Zulfi Bhai, I have reduced the diesel flow and adjusted the idle rpm. The engine overrun is under control as when i left the accelerator, the speed started to reduce. The car's pick has almost gone (typical CNG engine characteristic). The smoke has disappeared (although a very little smoke is there at full throttle). Morning missing is still there. Glow plugs are working fine for all cylinders. AND my mechanic says that do not mess with injection timing.

Now tell me:

whether I have reduced the diesel flow more than desirable level?
If yes, then like I asked you in previous post, how would I know that diesel flow is at desirable level?
Is there any marking for adjustment of Diesel pump on engine? (My mechanic saying that morning missing might be due to mis-managed timing of pump but is hesitant to put hands on it)
Is this a good time to change diesel injectors?

Thanks

[Dani80pk]

Zulfiqar Bhai, finally I managed to get things back to normal except a few exceptions. I got the new genuine radiator and put fans back to auto again. Seeing half needle within 5min of driving. Starting is fast as usual. A very little smoke that too if revved hard. Average goes upto 16-17km/l.
Now the exceptions.

1. Morning missing is still there with white smoke
2. Pump is still making noise especially when cold. When driving the noise diminishes but at idle it starts making noise again.

Now the question is, should I leave the car as it is or something can be done for above two points.

Thanks

[Dani80pk]

Someone please comment on my last two post.

to all who requested pics, I am so sorry I just cant find enough time to do the job (Taking pics and uploading) but I will try to do it asap.

[spectra]

Zulfiqar Bhai, finally I managed to get things back to normal except a few exceptions. I got the new genuine radiator and put fans back to auto again. Seeing half needle within 5min of driving. Starting is fast as usual. A very little smoke that too if revved hard. Average goes upto 16-17km/l.
Now the exceptions.

1. Morning missing is still there with white smoke
2. Pump is still making noise especially when cold. When driving the noise diminishes but at idle it starts making noise again.

Now the question is, should I leave the car as it is or something can be done for above two points.

Thanks

Missing is too much on cold start? Blue smoke along with missing? Karachi weather is not that severe and if your car is missing in that weather i think timing is way out of mark.

[Dani80pk]

Missing is too much on cold start? Blue smoke along with missing? Karachi weather is not that severe and if your car is missing in that weather i think timing is way out of mark.

Saqib Bhai,I sent you pm to get your cell phone number. Please forward it to me as I wanna talk to you.

Engine is missing (too much) only in the morning with blue smoke. After that no more missing at any part of day though very very mild jerks are there in idling. When revved all normal. It does not shows any signs of missing when started any time after morning start.

[spectra]

Saqib Bhai,I sent you pm to get your cell phone number. Please forward it to me as I wanna talk to you.

Engine is missing (too much) only in the morning with blue smoke. After that no more missing at any part of day though very very mild jerks are there in idling. When revved all normal. It does not shows any signs of missing when started any time after morning start.

Andazay se 1 mm pump utha dou khud hee, koi rocket science nahin hai

[Dani80pk]

Andazay se 1 mm pump utha dou khud hee, koi rocket science nahin hai

cell phone number??? Please pm me. thanks

[Dani80pk]

Car's morning missing is gone from last two days. Nothing done but suddenly it has gone. Dead cold engine starts on half self but when hot it takes a second or two before starting (without pressing accelerator). If car is revved hard on upward slope, it emits dense clouds of smoke. on straight roads however, smoke is not that much (I am talking about hard revving). Last night I poured in "Whiz" Diesel fuel treatment 11oz bottle in approx 45L of Diesel. An important thing that I noticed is that engine is giving slight, I mean very slight blow from oil dip stick place. Comments of diesel experts are needed for above observations. Thanks

[spectra]

Slight blow in dip stick means lost compression, as i suspected during our phone talk. cold start without missing might be due to increasing ambient temperature. Still i think your diesel pump setting is retired and in absence of accurate measurement, you can do some hit and trial to advance it a bit and see results.