Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: JayMV6 on 28 January 2012, 18:15:25
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Opened up the engine while it was on the stand to discover this.
(http://i903.photobucket.com/albums/ac236/JayMV6/211.jpg)
And the head
(http://i903.photobucket.com/albums/ac236/JayMV6/196.jpg)
looks like something had been in there and got munched up ???
This was supposed to be a replacement engine for mine
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So basicly i told this could be down to detonation? just wanted other peoples opinions on this? :-\
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possibly the electrode off the plug :-\
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Had similar on my 2.0 vectra , never did find out what caused it :-\
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all its done to the bore is a slight score down the length.You can feel it with your fingernail. Will that mess around with the compression as its only slight
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Imo,probably. It might also possibly let oil up to the combustion chamber and burn it out the exhaust. If the score has sharp edges it could cause the piston to seize.You really need to get someone who is experienced in these things to take a look at it for you imo.
Im not sure a plug electrode would do that much damage,but I may be wrong. Have you looked at the valves to see if one of them has a piece chipped out of it ? Could be a piece of valve has been bouncing around in there.You may well never find out what caused it but it needs some expert attention.
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Cheers for the replys. If the bore works out to be ok then ill stick a piston in from another engine i got and im using a diffrent head anyway.
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Not sure if it's connected. But looking at the piston, near the centre is a small circle patch, then if you look just under where the plug is, it looks as if there's a chunk of metal (like a smile) missing / doesn't look to be any reason for it to be cast that way? Not sure if it's connected or if it indicates what might have caused the problem?
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possibly the electrode off the plug :-\
Agree with the above :y
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possibly the electrode off the plug :-\
Agree with the above :y
i only suggested plug electrode because if you look @ picture 2 one of the electrodes appears to be missing off the plug ;)
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You may be right actually.I find it hard to tell from the pic,but then my eyesight aint what it used to be.
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You may be right actually.I find it hard to tell from the pic,but then my eyesight aint what it used to be.
i can see the moon when its not out with my bins on ;D ;D ;D ;D
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possibly the electrode off the plug :-\
Agree with the above :y
That was my first thought too. And closer inspection shows the dents at the bottom of the second pic are almost exactly electrode shaped when viewed from the side.
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You may be right actually.I find it hard to tell from the pic,but then my eyesight aint what it used to be.
i can see the moon when its not out with my bins on ;D ;D ;D ;D
You need to change your bins for differenter bins ..................... even I can see that there are two electrodes on the plug ;D ;D ;D
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Bit of image manipulation and zooming in .. the left hand electrode is certainly missing about 1/3 to 1/2 of its tip. Whether that is sufficient to have caused that amount of damage is debatable though. :(
(http://img824.imageshack.us/img824/6087/zoomc.jpg)
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You may be right actually.I find it hard to tell from the pic,but then my eyesight aint what it used to be.
i can see the moon when its not out with my bins on ;D ;D ;D ;D
You need to change your bins for differenter bins ..................... even I can see that there are two electrodes on the plug ;D ;D ;D
[/quote i think you can see 1 is shorter than the other though ;)
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I have my doubts.I would think it would get squashed,broken up, or blown out an exhaust port before doing that amount of damage. You never know though. :-\
The cause is academic to an extent though, as long as the offending item is no longer present. Fella needs to find out how potentially fatal the damage is by someone with enough experience to make a judgement call imo.
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Bit of image manipulation and zooming in .. the left hand electrode is certainly missing about 1/3 to 1/2 of its tip. Whether that is sufficient to have caused that amount of damage is debatable though. :(
(http://img824.imageshack.us/img824/6087/zoomc.jpg)
I think it's the angle of the dangle and all of both electrodes are present & correct :y :y :y
AIMHO ;)
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As big as I can get it before distortion ..
(http://img855.imageshack.us/img855/4117/zoom2a.jpg)
Certainly looks like some part is missing left side
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As big as I can get it before distortion ..
::) ::) ::)Oooer! ;) ;)
.....Certainly looks like some part is missing left side
IMO it's still all there, the curved bit up to the centre electrode is still clearly visible. :y
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Definitely a little piece missing from the one on the left.Dont believe for a minute though that it could have caused all that damage.
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As big as I can get it before distortion ..
::) ::) ::)Oooer! ;) ;)
.....Certainly looks like some part is missing left side
IMO it's still all there, the curved bit up to the centre electrode is still clearly visible. :y
We'll agree to differ methinks .. :)
Mind you .. that enlarged piccy seems to show quite a "trough" of missing metal around the lower edge of the plug seat ... I wonder if a lump of seat has dropped off .. and what would cause that .. :(
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I reckon the pic is off centre. Taken from the right slightly.
Electrode could have fallen off any plug at any time though...
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Also if there is any part missing I'm sure the op would spot that himself, no?
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What has caused it is somewhat irrelevant now though ;)
To the OP, IMHO you need to get that piston out and hone the bore... If it's only a light score you can probably get away with just honing it (gently) and re-using standard pistons with new rings :y But I'm not an expert and trying to diagnose these things without physically seeing/feeling them is very hard, so seek proper advice :y