Loud engine noise [not drivable]

[jdmlvn]

so recently my car has been having ticking noise, it was soft and not that noticeable so i ignored it. then a couple week laters whilst driving from work the sound was just really loud and overbearing (like bom bom bom bom, ye i knw bad description) and i realised the oil light blinked on for a couple of seconds then the light turned off, so i pulled over and got my car towed bak home.

when i got home i changed the oil and oil filter but the sound was still there.

so yeh, what could be the cause of this?

i was told that the timing belt may have been worn out cos i've hit 120xxx km and havnt changed the timing belt.

and ive also been told that my oil sump might be clogged up and the oil isnt pumping consistently.

so yeh.. wat are your thoughts?

btw.. the car is a 2002 rav4 egde, the car still turns on.

thanks in advanced.

cheers Gaz :)

[eg3]

Is the noise there when the car's idling? or only when driving?

Any chance it could be a worn out wheel bearring instead?

From my experience, a worn out timing belt doesnt really make any noise, but rather just snaps at some point.

[jdmlvn]

yeh the noise is there during idle

[eg3]

belts thrown out of alignment maybe? (although never seen it happen).

are you able to tell what general area under the hood its coming from?

also, does it increase/get louder/repeat faster when you rev up? or remains constant?

[jdmlvn]

belts thrown out of alignment maybe? (although never seen it happen).

are you able to tell what general area under the hood its coming from?

also, does it increase/get louder/repeat faster when you rev up? or remains constant?

im pretty sure the sound is coming from under the rocker cover, and yes the sound gets louder when i rev to a higher rpm.

[JDM.Power]

you spun bearing, you should start looking for a new bottom end, but best way 2nd hand rav4 engine.
or get a 2nd hand bottom end put it on, and sell the car

[jdmlvn]

lol alan why should i sell my car? i love it

[jdmlvn]

anyone else have a reason for this noise?

[migoreng]

timing belt and stuff hasn't been changed for 7 years??? and it's also done 120,000km?

i think that's the problem.
loose belt..maybe valves need to be adjusted. oil pump/water pump died?


anyways jdm power said spun bearing
what exactly does that mean? and how do you do that? is it from poor maintenance like sludge in the engine?
you make it sound pretty serious. lol. engine with original timing belt and 120,000km needing a rebuild already?

[jdmlvn]

should i also be worried about the oil sump? ive heard its a common problem that 02-04 rav4s have oil sump problems that it gets clogged up and the oil doesnt gets pumped correctly..

[JDM.Power]

timing belt and stuff hasn't been changed for 7 years??? and it's also done 120,000km?

i think that's the problem.
loose belt..maybe valves need to be adjusted. oil pump/water pump died?


anyways jdm power said spun bearing
what exactly does that mean? and how do you do that? is it from poor maintenance like sludge in the engine?
you make it sound pretty serious. lol. engine with original timing belt and 120,000km needing a rebuild already?

ahuh, no oil in the engine. and it will just make a knocking noises :thumbsup:

google "spun bearing" if you still dont know

[jdmlvn]

ahuh, no oil in the engine. and it will just make a knocking noises :thumbsup:

google "spun bearing" if you still dont know

yeh ive done some research, seems like a spun bearing. does a worn timing belt may have contributed to this?

[B18cEG]

yeh ive done some research, seems like a spun bearing. does a worn timing belt may have contributed to this?

I would say no, i think the fact that you had low oil and possibly the fact that your car has a known sump problem with clogage than it may be a conrod big end bearing that is causing your problem, pretty serious problem if u ask me since the thing is gonna be spinning at a few thousand rpm at least with a bit of free play in the rod, could cause u no problem also could cause u huge problem, normally occurs when there is no or not enough oil/lubrication going to the bearing it gets worn to the point that some of the bearing gets eaten away. either way get it checked out, a mechanics stethoscope is a great tool for finding this out or just go and get a mechanic to check it out for you. could be as simple as getting your rod bearings replaced.

Thanks and good luck

[JDM.Power]

yeh ive done some research, seems like a spun bearing. does a worn timing belt may have contributed to this?

not at all.. timing belt has nothing to do with oil in engine.
timing belt spings the cams, which connected to camshaft...which the internals need oil to be lube to freely spin.

but yeah as above said, mechanic to check.
but to me at atm, your bottom end is :thumbdwn:

[SeverAMV]

simple check, get a compression test, if its rather low, then it could be a worn timing belt causing your cam(s) to be out of sync. if its about right, then your problem is elsewhere.

btw, how long was it since you last filled the motor up with oil (before the engine light came on)? if it was a long time, then your oil being low is irrelevent to the situation.

[B18cEG]

I think it is cause by the low oil level, since you said there was a little quiet knock before and now its worse, can you tell me is it really bad as soon as you start the car and then gets a little quieter?

[Limbo]

spun bearing is usually from oil starvation.
quite rare on a car that's only done 120k, unless its had a hard life.

Pretty much need an engine rebuild cos the cost of the labour to change the bearing might as well pay alittle more to get the engine reconditioned at the same time

[Daveo]

If it sounds like this

http://www.youtube.com/watch?v=JkcLnbOls1M

chances are she's a bit broken, Guv'na :p

That video is a mate's car that engine ended up nuking itself and punching a hole in the block! He pulled it apart, and we worked out that one of the rod bolts had snapped (dodgy work by previous owner) and the cap gradually bent it's way off until the rod came free from the crank

[jdmlvn]

spun bearing is usually from oil starvation.
quite rare on a car that's only done 120k, unless its had a hard life.

Pretty much need an engine rebuild cos the cost of the labour to change the bearing might as well pay alittle more to get the engine reconditioned at the same time

can u explain what u mean by engine rebuild? like rebuilding what components of the engine?

[string]

You won't have 'spun' the bearing, just worn it down a bit from a moment of no oil, leaving space for the rod to knock on the bearing surface which now has some tolerance. A spun bearing is where one of the bearings becomes attached to the crank/rod and dragged around (from extreme heat and lack of lubrication), causing catastrophic damage to the crank, rod, and will most likely result in something (the rod) snapping. You should be glad this hasn't happened (yet) because a con-rod has an incredible amount of kinetic energy that you certainly don't want being unleashed on the side of your block.

Bad bearings have a characteristic knocking that almost does not need to be diagnoised. Oil light coming on is icing on the cake. Best case scenario is that only the bearing is bad. The bearing surface on the crank is a considerably harder than the bearings and it isn't impossible to get away with no damage. Unfortunately, this best case scenario is a still a labourous and thus potential expensive process.
This is why all should check their oil at least every week.

Good engines (Honda B-series for one) are incredibly buff - but you have to have the essentials working; lubrication and temperature.

[trism]

no. once the knocking has occured, and the oil light comes on, the damage is already done especially seeing as how the OP said he ignored it for a couple of weeks

id say the the engine is very close to throwing a rod thru the block (ive done it, its not pretty)

either get a new bottom end (rods, bearings, possibly crank) or a whole new block

dont bother trying to top it up with oil and keep going coz it wont help at all

[string]

I agree with the above sentiment. Once you've heard the knocking, you're ****ed basically. Valuable lesson here folks; OIL IS GOOD, KEEP IT FULL.

[jdmlvn]

thanks for the input, found the problem, the engine has a spun bearing. been told i need a new block, so i just bought a 2nd hand 1az engine as i got it really cheap.

[eg5civic]

this just happened to me few nights ago

but my motor was old.. i heard the knock, oil light flashed a few times... had to drive it to work and back and last night it started to play up.. was accelerating and then the car sorta slowed twice then kept accelerating...

B series here i come, i'll be glad to lose the d with 300000k's on it

Btw would it be alright to drive it to the mechanics down the road from my place.. they are like 5 mins down the road... but i dont exactly want to risk a rod letting go if thats what can happen cause this sounds exactly like my problem

[trism]

whebn a rod lets go itll either just go pop and not be connected to driveshaft, or, int eh most likely case itll punch thru the block.

[eg5civic]

ok so now the question is

should i try and make a rod come through the block before new motor XD (i'm doing b series conversion)