GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Carnie on 22 August 2010, 17:01
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Ok,put a few posts up about this already but we still havent figured it out.My mate left his car sitting for a while and on start up it was making a loud clunking noise in time with the engine(up and down with the revs etc)We put this down to the tappets and let it run for a while and it cleared up and went away.Anyway this has happened again now after he left it lying and it wont go away(let it run for about 10mins till engine was warmed up),we tried tappet treatment,that didnt work.We checked the cam and all the tappets,their fine,all valves move and no damage or give to any of the lifters.Everythings getting good oil flow.Next checked the big ends,no movement,only side to side a little but im told this is normal,oil pick up is clean and oil pump is working.Checked all the pulleys etc theyre all good.Filled it back up with oil etc and started it up and the engine is still clunking away.Really cant think what else it could be.Next step would be to take the head off but he just did the head gasket a few months back so he'd rather try that last.Any other suggestions?
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Might be time to whip the head off. Sounds like something is worn.
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When he did the head gasket before there was no sign of wear at all,all the cylinders were smooth,no ridging,pistons looked in perfect condition.It just be the case,we ll take the inlet off and have a look through to the valves,maybe we can see the prob there but i doubt it,head might just have to come off!
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Compression test? Could show if something is wrong with a particular cylinder.
All the pulleys are tight on? No wobble?
And it's 100% from the engine? Not any ancillary parts?
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Yeah all pulleys are tight from what i can see,checked the alternator tensioner and that seems fine too.Clunk is almost def coming from the engine but i dont know where,cant be anything else as nothing else would cause that clunking noise etc.Its lounder when under the car also.Would the water pump maybe cause this if it had gone?Never heard one thats bust so unsure.Is it possible its a crank bearing,again never heard a bust one.Just cant think of anything else in the engine that would do this.Ill maybe try get a recording of it to help.
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Sounds like tappets to me (though they dont clunk, they tap lol). Have you actually re-built them or replaced them? How thin is the oil you are using and have you tried any thicker stuff in there. Mine are a bloody nightmare but I just cant be bothered changing them (and will doubtless find some rather flat cam lobes when I do).
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We just put some 10w40 in there so i wouldve though that would be thick enough.The oil that came out was shot to pieces so i was hoping that would work but no difference.We thought the tappets at first but its too noisy for them i think,i mean theyre hydraulic and theyve got like 0.4m of movement so theres nowhere for that clunk to come from? :undecided:
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Worn small end bearing ?
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Yeah money is on the small bearing check the con rods main bearings if your planing to go diving!
If you drain the oil out to do the bottom end, check it for small bits of metal?
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There was no metal at all in the pan when we had the sum off last time.Take it theres no real way to confirm it is the small end unless we start pulling pistons out yeah?
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There was no metal at all in the pan when we had the sum off last time.Take it theres no real way to confirm it is the small end unless we start pulling pistons out yeah?
Yes to be honest, piston / rods out and see if you have any play.
Try and post a video up of the noise, might help
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tryed sliceing the oil filter open and looking at the eliment for sparkels yet ?
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We just put some 10w40 in there so i wouldve though that would be thick enough.The oil that came out was shot to pieces so i was hoping that would work but no difference.We thought the tappets at first but its too noisy for them i think,i mean theyre hydraulic and theyve got like 0.4m of movement so theres nowhere for that clunk to come from? :undecided:
0.4m of movement eh? Thats a lot :rolleyes:!!! The Haynes book of lies suggests 0.1mm of free play so it might be worth investigating the tappets a bit closer. I know when tappets get really stuck they sound absolutely terrible (mine sounds worse than a fiesta with a X-flow engine in it at times and I have had Peugeot ones that needed re-building make the engine sound like a tractor before now and that was down to me not changing the oil and checking the level for too long) and when they get old and gummed up/knackered they tend to leak down at idle/when the engines been stopped without some thick ass oil in there. Does the noise dissapear when you rev the engine (not good practice i know but the added oil pressure normally pumps them back up if you have the bottle to do it :sad:).
As suggested, get a vid of it put up.
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0.4mm was a guess haha i couldnt even tell if they had any give when pressing them so i couldnt measure.The clunking noise is constantly there while revving the car,speeds up etc with the revs.However if you give it a tiny bit of gas it does quiten down a little but thats about it.Nah we didnt check the filter,just the oil and the sump.Think it got binned there but might be able to scavenge it out to have a look.
How do the tappets make such a racket anyway when they get gunked up?From looking at them etc i couldnt tell how they could cause much noise.
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the hillbilly way to check for duff tappets is to start the engine with the cam cover off and poke the tappets down with a bit of stick if they go quiet ther knackerd
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Really haha hmm i dunno,with the cam moving is there that much room to get something in there?Also theyre being constantly compressed between the cam lobes and the valve spring so what will pressing on them with a stick do?
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you push the edge of the tappet, to the side of the cam lobe.
also there not constantly compressed between the valve sping an the cam lobe there is free play in there. pokeing them with stick effectivly adds some pre load to the tappet so when you press down on the tappet with lots of free play it makes the noise change. on an 8v i probly woldn't bother tho id just swap the lot for a known good set thats hanging around or a new set, but when you get 16, 20 , 24, 30, 32 and 40 v enignes with a ticky tappet it gets more and more usefull to be abel to track down the offending one
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I ll maybe give that a bash then and rule the tappets out before we go stripping the bottom end.
I wish id never offered to help haha :grin: