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attention all mini gurus, engine problem mystery
https://www.ausmini.com/forums/viewtopic.php?f=2&t=63611		 Page 1 of 1
Author:  SuperClubby [ Wed Jun 09, 2010 7:29 pm ]
Post subject:  attention all mini gurus, engine problem mystery
Hi Guys

I was driving along in my 1100 when suddenly it dropped to 2 cylinders. when i pulled over to check it out, it idles rough though when you rev it past 1500 it makes a metal on metal tapping sound. so it turns out i blew a head gasket between cylinders 3 & 4 which is why they are both down on compression by 100psi and why its running on 2 cylinders. though what would that metal on metal tapping/ratteling sound be??
Author:  simon k [ Wed Jun 09, 2010 7:44 pm ]
Post subject: 
you'll find out when you take the head off... could be all sorts of things, but maybe just a noise the combustion is making
Author:  SuperClubby [ Wed Jun 09, 2010 7:51 pm ]
Post subject: 
the head has been taken off and it looks fine! no scores in the barrels or marks on the piston. its a mystery so far
Author:  9YaTaH [ Wed Jun 09, 2010 8:00 pm ]
Post subject: 
Oftentimes escaping gases/noise from a blown headgasket can sound metallic or like loud ticking :roll:
Author:  850man [ Wed Jun 09, 2010 8:06 pm ]
Post subject: 
If the head gasket blows between cylinders 2 & 3 cylinders gases excape into the oposing cylinder and often out through the intake valve/into the carburettor. The noise you may of heard could of been this, it even can make the SU piston flutter.
Author:  Lockie91 [ Wed Jun 09, 2010 8:09 pm ]
Post subject:  Re: attention all mini gurus, engine problem mystery
SuperClubby wrote:
Hi Guys

I was driving along in my 1100 when suddenly it dropped to 2 cylinders. when i pulled over to check it out, it idles rough though when you rev it past 1500 it makes a metal on metal tapping sound. so it turns out i blew a head gasket between cylinders 3 & 4 which is why they are both down on compression by 100psi and why its running on 2 cylinders. though what would that metal on metal tapping/ratteling sound be??


have you looked closely at the tappets? It sounds like an arm might be broken or cracked due to the other damage. Make sure you inspect them really closely, might not be as obvious as first thought. If not, then its most likely just the noise from the blown head gasket.
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