Ask Xulfiqar - An Automotive Encyclopedia

[shahzeb89]

@xulfiqar salaam xulfiqar bro i need to ask smthing i hv ee90 and installed 7afe 5 months before, engine is running very good im confused about 1 thing my car's tail pipe gets dark brown type coating even i clean it with cloth but after running 70 to 80 km again it gets coated im sure its not black nor red its brownish my spark plugs r tan which shows combustion is all good even i checked my pcv valve its also ok and one last thing i used 10w30 havoline formula in it then summer came i poured 10w40 havoline but its mineral based oil what do u suggest is it ok to use 10w40 havoline or i should go for liqui moly 10w40 its synthetic. As i dnt know how much my engine is used before as its qaabli, i hv heard synthetic oil can effect valve seals. really need ur advice on this thank u in advance

[Naweed]

@Xulfiqar Sir I want to confirm if these comments in pic are yours.me & some other members of PW have qabli distributors in Cuore's so it must be of 660cc or 850 efi.it is written there that such electronic distributors have different timing curves.how it will effect car performance? Do you recommend this replacement? Please reply

Ignition timing would be adjustment of degrees u want firing sequence to start before the first piston reaches top dead centre (TDC) ... other pistons follow this like boggies in a train ... ignition curves may vary but the distributor should work for both 660 and 850

[Naweed]

One more thing .. lets suppose an electronic device auto fires the ignition system .. lets analyse

suppose a 660 cc car has 66mm cylinder and 850cc has 85mm ... now piston in 85mm will take longer to complete one cycle .. this time based curve might be fed in some processors of cars, still i think if u have the option to manually advance or retard timing, u will not face any problem

[Xulfiqar]

Good info but why Xulfiqar Sir just quoted 660cc for electronic distributor in that post regarding Cuore when 850cc Cuore Mira has electronic distributor too.another question how come that guy in post knew that it is a cuore distributor & Xulfiqar Sir specifically mentioned only for 660cc Cuore electronic distributor

the spark advance that is dialled into the distributor centrifugal and vacuum advance differs from engine to engine, e.g. your cuore revs upto 6000 rpm while the 660 one revs upto 8200. Both engines have distributors but differ in the spark advance curve. Your engine will behave erratic if you install one on the other. Even having EGR on the same engine calls for different spark advance.

The original CB points distributor installed by indus motors is very long life and tough, It just takes oldschool type maintenance like oiling the centrifugal advance and making sure the dwell timing is correct. The CB points are replaceable easily and then your dizzy is set for another session of 20,000 kms service.

[Xulfiqar]

Ignition timing would be adjustment of degrees u want firing sequence to start before the first piston reaches top dead centre (TDC) ... other pistons follow this like boggies in a train ... ignition curves may vary but the distributor should work for both 660 and 850

it will fit and work on idle and some rpm ranges, and it may render the engine gutless (retarded timing) or marbly (over advanced timing) in some rpm ranges.

[Proverbial_Slang]

Aoa @xulfiqar. Here's an interesting question. I have been doing research on this for some time. How much fuel would an engine consume on idle?
We have a coaster which is used for field activities and it has to remain on idle with ac on for a few hours. The mileage of the coaster gets skewed due to idling for so long.
The engine in question id Hino NO4C Turbo. There are a few formulae floating around on the internet. What are your thoughts?

Sent using Curiosity's onboard communications sytem.

[aston999]

Sir i have bought a mehran 2014 its gears are having sound of thak when car is on heat only reverse gear...

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[shahzeb89]

salaam xulfiqar bro i need to ask smthing i hv ee90 and installed 7afe 5 months before, engine is running very good im confused about 1 thing my car's tail pipe gets dark brown type coating even i clean it with cloth but after running 70 to 80 km again it gets coated im sure its not black nor red its brownish my spark plugs r tan which shows combustion is all good even i checked my pcv valve its also ok and one last thing i used 10w30 havoline formula in it then summer came i poured 10w40 havoline but its mineral based oil what do u suggest is it ok to use 10w40 havoline or i should go for liqui moly 10w40 its synthetic. As i dnt know how much my engine is used before as its qaabli, i hv heard synthetic oil can effect valve seals. really need ur advice on this thank u in advance

[syncview]

Aoa @Xulfiqar. Here's an interesting question. I have been doing research on this for some time. How much fuel would an engine consume on idle?
We have a coaster which is used for field activities and it has to remain on idle with ac on for a few hours. The mileage of the coaster gets skewed due to idling for so long.
The engine in question id Hino NO4C Turbo. There are a few formulae floating around on the internet. What are your thoughts?

Sent using Curiosity's onboard communications sytem.

usually such diesel engines consume about 2-4L per hour at idling speed under load, the only way to verify what yours is doing is to note down the idling time as well.

[wasim625]

@xulfiqar

Bhai salam,
I am about to change its clutch plates and clutch bearing.
What should i keep in mind while doing the job and what parts to change while i am in there to avoid any future visits in that side of the engine.
And secondly, what transmission does my car uses any model number or any reference that i can find on google in search of some literature that can help me find some torque specs and other procedural informations.

Regards,
Wasim

@xulfiqar

Bump

[Xulfiqar]

@Xulfiqar

Bump

while you have the transmission out for the clutch job, replace the main crank seal and if you find a welch plug behind the bell housing replace that too. Inspect the axle seals and replace as necessary and also check the starter. Also check the gearbox input shaft seal for weeping or leaking, replace if it is.

[Xulfiqar]

Aoa @Xulfiqar. Here's an interesting question. I have been doing research on this for some time. How much fuel would an engine consume on idle?
We have a coaster which is used for field activities and it has to remain on idle with ac on for a few hours. The mileage of the coaster gets skewed due to idling for so long.
The engine in question id Hino NO4C Turbo. There are a few formulae floating around on the internet. What are your thoughts?

Sent using Curiosity's onboard communications sytem.

The absolute best way is to measure the fuel consumed whilst the engine idles for an hour. as @syncview mentioned its 2-4 litres/hour depending on how the vehicle is equipped. e.g. does it have a 300amp alternator? or does the A/C keep on running whilst its idling etc.

You should also install an engine hours meter on it to keep up with oil change and service intervals.

[Xulfiqar]

@Xulfiqar the window issue solved by itself after I charged the battery though now have the issue that whenever I shut my headlights the check high beam message comes on and passenger side high beam does not work untill you turn the lights on again and flash the high beam couple of times then the the passenger side high beam also comes to life and works as normal untill you shut the lights of again
Is there a problem in the headlight switch or the wiring to the high beam?
Can BMW DIS diagnose this ?

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seems like the bus network is going crazy.. test it out first - and make sure you are using a good battery in it, if the system voltage goes below 11V some units fail to boot up or get delayed or get fuzzy.

Also do not offer jump start from this vehicle - just like your benz it wont like it.

[Xulfiqar]

@Xulfiqar sir, I asked about head bolts from a number of mechanics including Toyota.. They said it's not standard practice to replace head bolts during gasket change. I can't even get new head bolts from any auto parts shop in rawalpindi. Can you advice where to start from please ?

It is standard practice globally to replace the headbolts on a 1KZ when they are removed as they are TTY bolts. They actually deform and the threads expand on the unused area. When such used bolts are tightened you may get a false feeling that you are getting tight, while actually the threads are galling.

Your mechanics are right on the standard practice in Pakistan - because thats what they have been told by hazrat ustaad who was only accustomed to ancient engines from the 40s and 50s. Nuts/bolts have additional duties on import and these items are quite heavy too. (mehenga kaam)

The engine is made by toyota, they also have printed a service repair manual for it which you can refer to. It states to replace the cylinder head bolts whenever they are loosened.

Seems like your engine's cylinder head is loose and now warped from being unevenly tightened from reusing the bolts.

[arzaam.bhatti]

seems like the bus network is going crazy.. test it out first - and make sure you are using a good battery in it, if the system voltage goes below 11V some units fail to boot up or get delayed or get fuzzy.

Also do not offer jump start from this vehicle - just like your benz it wont like it.

Thanks for the reply
Dewan diagnosed it as a intermittent fault in the voltage regulator on the alternator as well as a 5 year old battery according to the service history
The voltage regulator was giving a stored fault when scanned by BMW dedicated scanner although the car did not produce any electrical issue while they had it and alternator was producing 14.4-14.6V with engine running.

For now changed the battery for a cool 50k rupees and it has been fine till now if still face any electrical issue then they say to change the voltage regulator independently of the alternator

Also they diagnosed the bearing noise from the front as a faulty belt tensioner pulley instead of AC compressor after listening with a stethoscope

But just to confirm if the noise is not effected by turning off or on the AC it can't be the AC clutch right ? As I thought it was AC clutch but when they removed the shields and checked with stethoscope they were confident it was the tensioner especially as turning the AC on or off had no effect or noise though at the same time noise does not get much louder when revved.

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[wasim625]

while you have the transmission out for the clutch job, replace the main crank seal and if you find a welch plug behind the bell housing replace that too. Inspect the axle seals and replace as necessary and also check the starter. Also check the gearbox input shaft seal for weeping or leaking, replace if it is.

Noted.

Ill be replacing the bearing that presses the plated (dnt know what its name its there since i saw on youtube) how should i grease it and what grease should i use.
I want to purchase some bearing grease what brand and specification should i go for?

And anything on the torques please?

[Naweed]

it will fit and work on idle and some rpm ranges, and it may render the engine gutless (retarded timing) or marbly (over advanced timing) in some rpm ranges.

time to re-study

[Xulfiqar]

Noted.

Ill be replacing the bearing that presses the plated (dnt know what its name its there since i saw on youtube) how should i grease it and what grease should i use.
I want to purchase some bearing grease what brand and specification should i go for?

And anything on the torques please?

the bearing that pushes on the pressure plate is called the throwout bearing. You dont need to grease it as its prefilled with it. You will however need to apply some nickel or copper antisieze on the input spline shaft of the gearbox so that the clutch plate can slide easily. It prevents clutch chatter.

[Xulfiqar]

sorry my bad for considering it a simple mechanical action

why sorry?? it actually is simple mechanical action.

[wasim625]

the bearing that pushes on the pressure plate is called the throwout bearing. You dont need to grease it as its prefilled with it. You will however need to apply some nickel or copper antisieze on the input spline shaft of the gearbox so that the clutch plate can slide easily. It prevents clutch chatter.

Oka.
What Bearing grease i should purchase? What temperature ranges bearing grease should be preffered.