Is your car main bigen (main bearing) making sound? Here is an amazing solution

[formula2012]

reset the timing belt tension on a dead cold engine, adjust the valve tappet clearances then recheck.

For main bearing diagnosis, you need to install an oil pressure gauge to the oil pressure switch port. The pressure would peak on cold and if it drops to below 10 psi on hot and cannot raise properly when revved - it shows bad crank bearings. Such failure can also be caused if the oil pump pickup tube was removed and installed without replacing the O ring, its supposed to be renewed everytime the oil pickup tube is dismounted. Silicone etc wont work and will cause the pump to cavitate and kill the crank bearings in short time.

got it.now will be calling my mech asap when i collect money by selling my sub n amp,:)

[Xulfiqar]

this thread could be very useful to subaru owners. EJ20T and EJ20TT are famous for throwing big end bearings.

the crankshaft of the EJ engines are trapped inside the crankcase webbings, the entire engine needs to be taken apart to remove the crank.

[shazo]

can any one advise me, i recently replace all four wheel bearing, this job was done by pressing machine, (3-4 MONTHS AGO) now the problem is one of my wheel bearing start creating noise again, at 40km/p speed or above, the voice is coming from might be front driving side or may be some where of rear, m fed up with this any assistance?

[faziljaved]

first what mr. zulfiqar said is right. when your bearings go bad you loose oil pressure. so checking oil pressure is the right way if you hear the knocking sound from the bottom of the engine.
second thing i want to mention is in most cases it is not easy to take crank shaft out from beneath. you will have to open up the whole engine. if your rings and pistons are ok then dont get them fixed.
take out your crank and check which bearing has the maximum wear and get your crank ground according to the bearing and buy set of bearings according to that.
but also there are chances that your crank is out of straight so also check the straightening of your crank and if it is bent get is straight or the new bearings wont last for long.
do it as quickly as possible cuz bad bearings makes your engine loose oil pressure and not as much oil goes up to the head of the engine as it is needed which causes further damage to the head, valves, cam etc. bad bearing can also cause damage to the rings and pistons cuz each time the loose con rod hammers the crank pin it quickly damages the remaining piece of bearing which contaminates oil and the metal particles reach the cylinder walls damage the cylinders, pistons, rings etc. if main bearing is worn then crank will bend more and more the more you use the car

[nfssaad]

on cold startups and on oil change.. my car makes a thak thak thak sound which vanishes on revving... mechanic suggested main bigens.. and as usual a full overhaul or engine change..

car is a charade cb23 engine.. oil reduces slightly about 1/2 liter per 3500km.. i change at 3500km..

xulfiqar bhai what range of pressure gauge should i buy to check the oil pressure?

any suggestions on what that might be..

i drive at max 3k rpm.. engine buzzes loudly at rpms above that.. never dared to take it to the full 6000 redline.. it just doesnt go there.. vibrates badly above 4k..

on the other hand a 170,000 km driven honda civic that we have with a sealed engine reves to its redline instantly and soundlessly

[Xulfiqar]

on cold startups and on oil change.. my car makes a thak thak thak sound which vanishes on revving... mechanic suggested main bigens.. and as usual a full overhaul or engine change..

car is a charade cb23 engine.. oil reduces slightly about 1/2 liter per 3500km.. i change at 3500km..

xulfiqar bhai what range of pressure gauge should i buy to check the oil pressure?

any suggestions on what that might be..

i drive at max 3k rpm.. engine buzzes loudly at rpms above that.. never dared to take it to the full 6000 redline.. it just doesnt go there.. vibrates badly above 4k..

on the other hand a 170,000 km driven honda civic that we have with a sealed engine reves to its redline instantly and soundlessly

get a 0-120 psi gauge. get an adapter from a hydraulics shop with exact same threads as the oil switch - its regular tapered pipe thread. Insert and check oil pressure, it would max out at about 80 psi cold and settle to a minimum of 15-18 psi. Anything lower than that means the oil pump is losing prime due to itself being worn or the crank being worn out.

The CB engines have a charecterisitic rattly sound under load, mechanics think its small end sound but its not. 99% of noise cases in the CB SOHC engines are worn out rocker shafts and rockers, I have also seen a lot of worn out camshaft bearings too. Dont rely on feel to fix it - use proper screw gauges and internal calipers to measure clearances. When you are repairing - notice the oil jet in the block, if its missing smack yourself and kick a wall - its very hard to find brand new.

When correctly setup the CB23 engine revs and sounds very very smooth - because it has a balancer shaft inside it.

[ShamiqSaeed]

I saw the video the poster posted, a friend's city 05 is making a similiar sound but a lot more rackity, like steel tapping on steel reall quick but not hard. And the thing just does not move however hard you rev it, and its been run on cng for some time, and ironically it runs much smoother and better on cng than petrol, it actually catches rev on cng. The car was kept really bad with no care as far as i have seen and know so no wonder its in this state. But i want to know what could be the possible mechanical problems/failures just by the description? Tappet rockers? Small end bearings? ill look into the oil pressure and oil loss so cant say much there, but radiator activity is insane, you have to fill it up quite literally everyday

[kazmi_muzammil]

hey there.. Im afraid i've been missing all the thread fun since i started small projects. After completing my Cousin's small Prado CNG Green project that proved to be way economical, I started playing with a friend's cultus which I purchased from him later. I was unable to start the thread for restoration I did to his beat up ride which was an 08 Cultus in a condition I hate to see cars in. But finally the baby has been given life and is in my Garage all fresh and new close to a brand new.

Anyways, Ive been playing with a crank shaft of 86'' Corolla. My question is to Xulfiqar bhai and anyone else who can help. I just got the crank rebuilt to a standard size. But before fitting it, I took some advices from major Mechanical Engineers who have been playing with crank shafts (but mostly deisel 1KD and other Diesel Engines)... They said that rebuilding the crank doesn't make a difference infact it is much safer then grinding the crank and getting it modified with new bearings...

So my question is, is this OK? I'm helping my friend restore an 86 corolla he brought recently. Please advice. O btw Cultus Pics are below..

A+ grade paint used in Restoration work, Engine is still guaranteed not opened and got the engine washed from Inside, Interior cleansing work done at home entirely and the car has been insulated and rebolted again and every crackling noise removed. New suspensions, Rims polished, new tyres, new indicators, bumpers, only painted part involves bonnet side fenders new installed as older were full of puteen (metallic filler) and some after market products in process (o pls teme when we install after market pistons which are of standard size (do they exist in standard size?) (those sports one i donno what u call them), does it increase the stress on shaft?
It took me a month to restore this car as the interior parts took alot of time as i did most of the work in DIY style. I just have one picture which is a day time one but the car was in a worser condition than it looks in the pics before it went for a makeover. The car is 110,000 on the dial but still goes to 130km on Gas and touched 175km/h on petrol after i completed every sort of tune up on it. P.S the new EFI engine does not have self adjusting tappets so guys get ur tappets checked cause tighter valves could be the result of back fire issue which most of these models have (if ur air filter is burning also then that is also the case of back fire)..

[kazmi_muzammil]

O and can you tell me is it recommended to change oil pumps while getting ur crank shaft work done out?

[kazmi_muzammil]

I saw the video the poster posted, a friend's city 05 is making a similiar sound but a lot more rackity, like steel tapping on steel reall quick but not hard. And the thing just does not move however hard you rev it, and its been run on cng for some time, and ironically it runs much smoother and better on cng than petrol, it actually catches rev on cng. The car was kept really bad with no care as far as i have seen and know so no wonder its in this state. But i want to know what could be the possible mechanical problems/failures just by the description? Tappet rockers? Small end bearings? ill look into the oil pressure and oil loss so cant say much there, but radiator activity is insane, you have to fill it up quite literally everyday

				 						[INDENT] 							For your concern regarding radiator, its quiet hot outside, i  fill my car's radiator water storage bottle by a pinch every day and  that is normal according to my dad who is a mechanical engineer himself.  As for the rattling noise u are telling about, can you tell me if the  car was run without oil for once in the past? Secondly, get the valves  checked if such an incident hasn't happened. And if you believe the car  is eating up water, firstly, dip the oil stick when in cold state and  see if any white foamy material deposits on it, if such is a case, your  car's head gasket is done and water is mixing in oil, secondly if that  is not the issue and u're still doubtful, you should check the water  pump. Rest ill wait for ur response regarding this then try to assist  you further on this when you give you're follow up as now it's sleeping  time for me :D 						

[/INDENT]

[Xulfiqar]

Rebuilt the crank to std again???, explain how. I know of only one way to do it but that is not possible in Pakistan on small scale.

[SER_GTR]

Rebuilding Crank On STD (A) No More Jokes Please

Crank Grind And Then Oversize Bearings Is The Only Proper Solution Here..!!

Other Than That...Its A Waste Of Time...!!

For Oil Pressure Check...Xulfi Bhai 99% ppl Don't Do This Kind Of Stuff....Even I Recommend It To So Many People But They Never Listen Of It And Keep On Doing Stuff.....Result Is Either They Came Back With Sound ...Some Just Rub Crank With Different Sand Paper...Like Cleaning Carbon Deposit From Terminal And Putting Std Bearings.....!! Others Get It Open And Grind And Put Bearings But Never Bother A CHECK

Who Buy 150rs Gauge And Less Than 200rs Adopter And pipe And Who Will Undo Oil Switchr And Check OIL Pressure????? What If They Broke Switch..Have To BUY NEW ONE Janab

Are U Kidding.??? They Have EAGLE EYES Sir......Start ENGINE....Open OIL CAP......Revv It....Oil Is Showing Up?? All GOOD...Close And YES Sir...Its Good To GO>...Done..!!:S

[SpoonMotorSports]

can any one advise me, i recently replace all four wheel bearing, this job was done by pressing machine, (3-4 MONTHS AGO) now the problem is one of my wheel bearing start creating noise again, at 40km/p speed or above, the voice is coming from might be front driving side or may be some where of rear, m fed up with this any assistance?

get kabli bearing the pressing method doesnt last long!

[Xulfiqar]

Rebuilding Crank On STD (A) No More Jokes Please

Crank Grind And Then Oversize Bearings Is The Only Proper Solution Here..!!

Other Than That...Its A Waste Of Time...!!

For Oil Pressure Check...Xulfi Bhai 99% ppl Don't Do This Kind Of Stuff....Even I Recommend It To So Many People But They Never Listen Of It And Keep On Doing Stuff.....Result Is Either They Came Back With Sound ...Some Just Rub Crank With Different Sand Paper...Like Cleaning Carbon Deposit From Terminal And Putting Std Bearings.....!! Others Get It Open And Grind And Put Bearings But Never Bother A CHECK

Who Buy 150rs Gauge And Less Than 200rs Adopter And pipe And Who Will Undo Oil Switchr And Check OIL Pressure????? What If They Broke Switch..Have To BUY NEW ONE Janab

Are U Kidding.??? They Have EAGLE EYES Sir......Start ENGINE....Open OIL CAP......Revv It....Oil Is Showing Up?? All GOOD...Close And YES Sir...Its Good To GO>...Done..!!:S

I wonder why... laziness perhaps... or plain "hum baadshah loag hain - hum haath kaaley nahin kartay" hum khud light ka button on nahin kartay - aur ye umeed ke hum apni car ka bonnet kholein?"

get kabli bearing the pressing method doesnt last long!

hmm - I have pressed in several dozen bearings with both hydraulic press and screw type press I made, if you have the correct size spacers it will be OK - if you install the bearing incorrect or forgot some seals or grease - of course it will rumble.

[Skill]

@poster,
how could you re size the crank shaft to STD,by welding some materials on it?
In local mechanic terminology they call it sprayed crank and that is not better than a ground crank,it could become the cause of tearing the small chips from`the crank shaft later inside a running engine.

[SER_GTR]

PAKISTANi's Biggest Jugaar...!!

Broken????? WELD It xD

[SER_GTR]

I wonder why... laziness perhaps... or plain "hum baadshah loag hain - hum haath kaaley nahin kartay" hum khud light ka button on nahin kartay - aur ye umeed ke hum apni car ka bonnet kholein?"

hmm - I have pressed in several dozen bearings with both hydraulic press and screw type press I made, if you have the correct size spacers it will be OK - if you install the bearing incorrect or forgot some seals or grease - of course it will rumble.

Lolx True....Infact No One Bothers....! All They Want Is Problem Solved In Matter Of Hours....Unless Or Until They Get Tired Of Paying And Then They Look Around After Spending Handsome Amount...!!

[usman505]

get a 0-120 psi gauge. get an adapter from a hydraulics shop with exact same threads as the oil switch - its regular tapered pipe thread. Insert and check oil pressure, it would max out at about 80 psi cold and settle to a minimum of 15-18 psi. Anything lower than that means the oil pump is losing prime due to itself being worn or the crank being worn out.

The CB engines have a charecterisitic rattly sound under load, mechanics think its small end sound but its not. 99% of noise cases in the CB SOHC engines are worn out rocker shafts and rockers, I have also seen a lot of worn out camshaft bearings too. Dont rely on feel to fix it - use proper screw gauges and internal calipers to measure clearances. When you are repairing - notice the oil jet in the block, if its missing smack yourself and kick a wall - its very hard to find brand new.

When correctly setup the CB23 engine revs and sounds very very smooth - because it has a balancer shaft inside it.

so bro whats the solution of rocker shaft and rocker noise in cb 23 engine......
my mechanic is saying that thay will grind or polish the shaft and this noise will gone than....
is this the proper way or should it be replaced???

[sulemanb]

Bro I have recently got the same problem of Goonj (echo) like sound in my car (honda accord 1988) and I even hear this sound when car is neutral. And when I go in first gear I feel something is some feeling in steering and floor. Jaisay koi ragar lag rahi ho kisi cheez ki, specially wheels may.
I get it checked with mechanic, he said it not coming from engine, he said its coming from AC compressor bearings. I don't know if it can make that sound cause I hear this sound even when AC is off.
Please suggest if somebody knows good honda mechanic in Lahore.

[Hassan1991]