Diesel engine health

[mwanwar]

check engine tune, most causes of loud engine noise is bad valve clearances and bad injection timing.

Sir can u please reply my query will engine start on half self in this case and how often should we check valve clearance
Plus please also let me know how to check if O/D is engaing or not as per speedometer O/D is on but I have a doubt it is not engaging engine is 4m40 auto tranny

Sent from my GT-I9500 using PW Forums mobile app

[YamahaYB100]

@xulfiqar
What could be the reason behind poor throttle response of Toyota 2l engine which is swapped in hiace 6 month earlier
Engine is in good conditions it's used one (kabli)

[YamahaYB100]

Bump...

[Xulfiqar]

@Xulfiqar
What could be the reason behind poor throttle response of Toyota 2l engine which is swapped in hiace 6 month earlier
Engine is in good conditions it's used one (kabli)

how is the exhaust looking?

is this engine a convert from 2L-TE to 2L

[YamahaYB100]

It's 2l and exhaust smoke is normal but sometime it's black . In early morning now it dances a lot then after warm up it behaves normal I
Also it take long self to start

[Xulfiqar]

the 2L you buy from the scrapyard is usually a 2LTE on which the injection pump is swapped out for a toyota 2C or something - because the original pump is electric.

thats why I asked

mostly what happens is that the swapped pump does not run right due to being timed incorrect.

[YamahaYB100]

the 2L you buy from the scrapyard is usually a 2LTE on which the injection pump is swapped out for a toyota 2C or something - because the original pump is electric.

thats why I asked

mostly what happens is that the swapped pump does not run right due to being timed incorrect.

In my area no one have dial gauge and compression tester
Please tell about fuel amount which should injected on specific strokes

[raftechs901]

AOA Xulfiqar bhai, first of all thank you very much for all the information you compiled regarding diesel engines.
Brother I need your expert advise on my following issue please.
I recently bought a toyota prado 2003 3.0L diesel. I am new person to diesel engine and I am caught up in the engine oil eat problem, i bought it from LHR got its oil changed, oil filter and diesel filter changed from a authentic oil shop in DHA and drove it back to Multan.
I got it's timing belt changed from Multan as I was told by friends and others about the maintenance of diesel engine, after that I happen to drove it back to LHR for some work stuff and on the way back it showed engine oil light on, I ignored it for 10 15 km and then eventually pulled over and took the dip stick out and there was no oil at all. the engine is starting up good, giving decent mileage, no back smoke, while getting new oil inside it the oil change person told me by opening the cap of the oil that is giving blow and your engine is giving a blow.

I went to Toyota and told them the whole scenario, the foreman without even checking anything suggested me for a engine overhaul as my engine is finished by now... the car is clean and doesn't seem to have done more than 150k. I was in a mere shock when he told me 350k just for engine overhaul, I drove it back home and it again eat about 2 liter of oil in 700km.

I need your sincere advise on this please.

Many Thanks in advance brother.

Bro you should check the turbochaeger bush (if turbocharged engine) some times turbocharger bush is wornout it burns all the oil without disturbing the engine performance further you can ask xulfiqar bhai

Sent from my SHV-E160L using PW Forums mobile app

[ahmed2396]

Recently bought a Mitsubishi Pajero Gen-1 SWB with intercooled 4D56T, when i hit the gas it gives black smoke and while start also. And using Caltex Delo in it. The pick is good enough but smoke is there when you rev up and it is 200k driven.

[Muhd_saddique]

Dear Xulfiqar Bahi,

Kindly guide me to resolve the 2.od engine vibration issue after engine warm up. When the temperature needle near half, engine starts vibrate. (Cold engine doesn't vibrate). There is no black / white smoke. Engine mountings are also perfect. Last year technician replace nozzles / valve seals and other belts with belt tension-er. No engine oil consumption , millage is good. car starts easily cold or after warm up. At present the 850 rpm are set.
I don't have the diagonal gauge so technician mark the point before dismantling IP for its cleaning purpose during nozzles replacement.
The engine stops vibrating after switching ac on and rpm increase to 1000. AC idler works also ok. All fans are automatic working without thermostat valve. i am using caltex coolant in radiator.
Kindly guide, why is the vibration issue after engine warms up. Before replacing nozzles there was no vibration issue.

[Xulfiqar]

recheck the injection timing - it sounds like your engine timing is out of spec when it comes to temperature, there is a cold start device on the pump which actually advances the timing when cold and releases it to normal.

Your pump sounds like its advancing it to normal and releasing to "retard" - check to see if the cold start device actually moves. Please install the thermostat valve in the engine - diesel engines are naturally very cold engines - and them being compression ignition - they require heat to work correctly, your engine oil will remain cleaner too if the engine operates hot.

If its working - then nudge the pump a hair to advance - best result will be had after timing it with dial gauge and testing the injectors for correct break pressure. - Their break pressure also sets the cylinder timing, low pressure = advance, high pressure = retard.

[YamahaYB100]

In my area no one have dial gauge and compression tester
Please tell about fuel amount which should injected on specific strokes

Bump...

[Muhd_saddique]

Dear Xulfiqar bahi, thanks for the guidance.

Cold start is working and today i will try to advance a pump as you mentioned and will let u know the result.

[usman_arooq2]

Dear Xulfiqar Bahi,

Kindly guide me to resolve the 2.od engine vibration issue after engine warm up. When the temperature needle near half, engine starts vibrate. (Cold engine doesn't vibrate). There is no black / white smoke. Engine mountings are also perfect. Last year technician replace nozzles / valve seals and other belts with belt tension-er. No engine oil consumption , millage is good. car starts easily cold or after warm up. At present the 850 rpm are set.
I don't have the diagonal gauge so technician mark the point before dismantling IP for its cleaning purpose during nozzles replacement.
The engine stops vibrating after switching ac on and rpm increase to 1000. AC idler works also ok. All fans are automatic working without thermostat valve. i am using caltex coolant in radiator.
Kindly guide, why is the vibration issue after engine warms up. Before replacing nozzles there was no vibration issue.

Xulfiqar bhai, this post made me question if 2.0d saloon 2003 should increase rpm on a/c or not???? the car idles at 900 and rpm drops to 850 on a/c(there isn't any loss of power or anything), the car's been giving great mileage and runs great, should i get it inspected????? its been like this since i bought it and a/c is chill

[Salman922]

@xulfiqar bhai kindly tell me why do some people suggest to pour oil in diesel tank ? is it beneficial ? if yes then in what ratio of diesel to oil shall me pour in ? and what grade of oil ?

another problem, i went to Mr.Afzal (abdul hameed & sons) for suspension work, while testing he said my car has "humming sound" above 1600 rpm which shouldn't be there.

i asked afzal, 'isska hal ?'

afzal replied 'zulfiqar bhai se puchna'

[Xulfiqar]

Bump...

ok - lets see here

assuming you have the original injection pump and everything is top notch perfect, (rotor head set correct etc.) correct set on the bench and it can push out fuel correctly (no air in hard lines)

the injection quantity at 1400 rpm is about 14.05 ~ 14.36 cc - measured at 200 strokes
measuring at 1200 rpm is 13.96 ~ 14.28cc @ 200 strokes measurement

^^

assuming you have a boost aneroid pump and is pressed with 9 psi air and accelerator pulled to full (this is full load volume) - the volume if you measure it at 2300 pump rpm the volume should drop to 4.5cc as the governor kicks in

make sure the internal pump pressure is 40-50 @ 500 pump rpm and approximately 100 psi @ 2100 pump rpm.

the advance system is measured with timer device - does your injection pump test shop have this instrument? The internal pressure is measured with an adapter on the denso timer measuring device too - you adjust internal pressure with the outflow regulator that is screwed into the pump - adjustment is made with hammer and mandrel - dont overdo it because you would need to replace the item if overdone.

[Xulfiqar]

@Xulfiqar bhai kindly tell me why do some people suggest to pour oil in diesel tank ? is it beneficial ? if yes then in what ratio of diesel to oil shall me pour in ? and what grade of oil ?

another problem, i went to Mr.Afzal (abdul hameed & sons) for suspension work, while testing he said my car has "humming sound" above 1600 rpm which shouldn't be there.

i asked afzal, 'isska hal ?'

afzal replied 'zulfiqar bhai se puchna'

dont pour engine oil in the diesel fuel tank - its not of any use. The humming sound is usually due to bad valve clearances which cause the air in the intake manifold to resonate the airbox.

[Salman922]

dont pour engine oil in the diesel fuel tank - its not of any use. The humming sound is usually due to bad valve clearances which cause the air in the intake manifold to resonate the airbox.

But valve clearances were done just 3000 kms back.

Can this sound be due to a broken air box clip ?

[Xulfiqar]

yes it can be due to air box being loose also.

[Muhd_saddique]

Dear Xulfiqar bahi,

I advance the IP as you mentioned, but issue still there. One of the technician last year also changed its rotor (i forget to mention in last post) and now he is calming that this issue is due to again play in the rotor. This installed rotor was polished/chrome locally.
Need your suggestion