Knocking noise
 

Hi all just come back from a blast about in scooby and i have a wired noise

when driving its making like a ticking/knocking noise from bottom of engine

im guessing its bottom end or bearings

what do you guys think and what's cost of repairing??

Cheers guys

Oh dear it sounds like you have done your big end/ends mate,can you post a vid so we can hear the noise and be sure?

any recent work been done ?

ill get a video up today of the noise, the noise goes if i press clutch in

and no new work on car, thanks

ps: whats cost of new bearings and fitting

if youve done the bearings chances are youl need a new crank, not gonna be cheap mate.
around £500 for just a new crank. ive been told you cant or rather shudnt be re grindind a scooby crank, im sure some one could confirm this???

If the noise goes when you put the clutch in then it sounds like the release bearing is failing.

Good news is you'll just need a new clutch and not a new engine.

+1 happy days if it goes when the cluth pedal is down :thumb:

Does it only happen when engine cold? The engine will always be slightly tappety when cold. However if you say it's definitely coming from bottom of engine it won't be the tappets. Strange that it goes away when you press the clutch. In that case as above does sound like something more minor like clutch release bearing although its still a clutch out job I believe. Hope it works out ok.

yea the noise is there all the time hot and cold but yea noise goes away with clutch clutch was fitted about 6 months ago so still under warranty so going to get it looked at tomorrow

thanks all been a great help

View My Video

above i have uploaded video of the noise few more garages saying its bottom end knocking

what you guys think

record a vid of the back off the engine over the gearbox and get some one to press the clutch in for ya so we can hear it.

That sounds like a bottom end knock to me fella I'm afraid to say:(

Sorry to say sounded like mine +1 above:cry:

if its going when clutch is depressed i cant really see how it can be the bottom end? as said above, that would indicate to me that your issue is with the clutch release bearing. Iv heard failing release bearings before that have sounded horrendous, and can produce a very loud knocking noise which could be mistaken for bottom end shells gone.

Agreed. My money is on a clutch/box problem. Garages will tell you the worst cause it makes them more money.

well when out of gear and about 2000+ revs the knocking continues so guessing its bottom end?

Push the clutch in, Does it still make the knocking noise?

yea when not in gear but when driving it stops

yeah the noise stops when drivin because it just goes to tick over so you wont hear it, BOTTOM END it is then fella join the club :(

Will bottom end fail cause low boost and car used to boost to 1.5bar but now looking at max about 0.5~0.8

I'd assume a leak of some kind would cause your loss in boost. Bottom end failure is rare and from what I understand caused normally due to lack of oil or other major factors. You'd know if it was bottom end failure as there would be a knocking noise as in this case.

Ok so bottom end failer would not cause low boost preasure? As I thought bottom end failer would cause low oil pressure

Thanks

Your oil pressure will drop with big end failure as it leaks out the side of the shells,boost pressure is for the turbo is nothing to do with the oil.

The best thing you can do is drop your oil out and filter it to see if theres metal in there if there is look no further im afraid :(

It sounds like botom end failure, IMHO

The fact it goes when the clutch is deperessed could be that the end float on the crank\bearings is taken up by the pressure of depressing the clutch,

Also the consistancy of the ticking\knocking sound increasing with engine revs rules out the release bearing.

The best way to rule out the release bearing is to run the engine and gently lever the clutch arm in the opposite direction of operation, if it still makes a noise it is defo engine related :cry:

So the fact there is low boost indicate there is a problem with boost aswell

Could be that the rings have also failed causing boost to pass past the bore\rings into the oil breather system - or the ECU has cut the boost due to conditions. completely depends on what set-up you have and where you got your boost readings from

is it blowing smoke out the breathers or filler cap,piston ring land maybe?

ill check tomorrow but not seen any smoke and boost taken from boost gauge that has been very accurate in the past

ps: no engine management light on

nope its not blowing any smoke out, so im at a loss at to whats causing low boost

thanks