What has happened to my engine ?
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- Minor Fan
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What has happened to my engine ?
Worked fine yesterday .. this morning .. turn the starter Apparently no compression on number 1,2,3 .. rocker cover comes off .. the inlet valve's are all open and stuck there ... WIERD ..
Head comes off on Tuesday anyone care to speculate ?
Head comes off on Tuesday anyone care to speculate ?
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- Minor Fan
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Rockers all fine and rocking .. valves stuck down with a screw driver under them they will not come up.bmcecosse wrote:Sounds like no oil has been getting up to the rocker shaft - and the rockers or the valves have seized. Have you recently had the head off ? Was the rocker gear soaking in oil - or bone dry - when you lifted the rocker cover off ?
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- Minor Legend
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no compression
Interesting, if the valves will not come UP will they actually go DOWN any
further? If they will then I would suspect that the seat inserts have dropped
out and wedged the valves open! If they will not go any further down then they would appear to have siezed up but the puzzle is that it appears that the
engine was working normally when you switched it off!
further? If they will then I would suspect that the seat inserts have dropped
out and wedged the valves open! If they will not go any further down then they would appear to have siezed up but the puzzle is that it appears that the
engine was working normally when you switched it off!
Willie
[img]http://i39.photobucket.com/albums/e197/wuzerk/mo9.jpg[/img]
[img]http://i39.photobucket.com/albums/e197/wuzerk/mo9.jpg[/img]
The inlets don't have inserts do they? I know unleaded exhaust seats are hardened inserts, but if it's the inlets that are sticking then I wouldn't think it's that.
Could it be a lubrication problem? I'm thinking something like a failure of the filter, causing particles to get between stem and guide.
Or maybe valve springs.
The odd thing is to have three go at the same time - Can't imagine seats springs or valves' guides all sufferign the same failure like that at once
Could it be a lubrication problem? I'm thinking something like a failure of the filter, causing particles to get between stem and guide.
Or maybe valve springs.
The odd thing is to have three go at the same time - Can't imagine seats springs or valves' guides all sufferign the same failure like that at once
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- Minor Legend
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engine
No, the usual unleaded head would only have exhaust valve seat inserts but
anything could have happened to the one in question. I was thinking on the lines of a badly rebuilt unit which had inlet inserts too. Unlikely but this is a
pretty unlikely fault we are discussing. Could the inlet valve guides have
moved downwards until they are preventing the valves from closing? This is
getting ridiculous!!
anything could have happened to the one in question. I was thinking on the lines of a badly rebuilt unit which had inlet inserts too. Unlikely but this is a
pretty unlikely fault we are discussing. Could the inlet valve guides have
moved downwards until they are preventing the valves from closing? This is
getting ridiculous!!
Willie
[img]http://i39.photobucket.com/albums/e197/wuzerk/mo9.jpg[/img]
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- Minor Addict
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Aye - but all of a sudden on all the valves - highly unlikely! You must remove the head for inspection - and then before re-fitting - PROVE there is oil coming up the little oil-way to the head - and then again prove there is oil getting up to the rockers, through the drilled rocker pillar - along the shaft - and onto the rockers. The rocker shaft should be plugged at both ends - has one of the plugs come out ?
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- Minor Fan
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Sorry I've been down in Brighton watching my sister getting married.
I haven't looked at it again yet (Head change in the morning) ..
What i suspect is that the valves were opened by the camshaft and they have stuck there.
I think I know why as well ..
I picked up a jerry can (of mine!) at the stables and was surprised to find it about 3/4 full of fuel. I have a HORROR of storeing petrol anywhere but in the fuel tanks fo vehicles and certainly not in barn full of Hay.
I sniffed it, it was petrol .. So I poured it into the petrol tank ...
Turns out that it wasn't petrol .. a friend had borrowed it to drain a petrol tank that had accidently had five litres of diesel put in it ..
So we reckon about four litres of diesel in a moggie tank ..
It means very little to me as I have a very nice head here that I was going to exchange for an unleaded one ..
I'll exchange the buggered one instead ..
I haven't looked at it again yet (Head change in the morning) ..
What i suspect is that the valves were opened by the camshaft and they have stuck there.
I think I know why as well ..
I picked up a jerry can (of mine!) at the stables and was surprised to find it about 3/4 full of fuel. I have a HORROR of storeing petrol anywhere but in the fuel tanks fo vehicles and certainly not in barn full of Hay.
I sniffed it, it was petrol .. So I poured it into the petrol tank ...
Turns out that it wasn't petrol .. a friend had borrowed it to drain a petrol tank that had accidently had five litres of diesel put in it ..
So we reckon about four litres of diesel in a moggie tank ..
It means very little to me as I have a very nice head here that I was going to exchange for an unleaded one ..
I'll exchange the buggered one instead ..
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- Minor Fan
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So I took the head off .. One thing is that the bores are in perfect condition with no wear at all, Which makes me very happy.
The inlet manifold was covered in a black treacley deposit .. Sticky and horrible ..and this continued onto the valves and was obviously causeing the problem. Also this morning the valves had returned to their "Normal" position ....
One new replacement head later (started first time with a nice cloud of blue smoke from the oil in the bores) runs fine ...
I still don't know what caused it .. I put in contaminated fuel but there was no smoke (which I would have expected)
The tank of petrol before the contaminated one was the contents of Max's petrol tank (which was half full) with 1995 vintage 4Star (I assume) ... Could that have had anything to do with it ?
Still stumped ..
The inlet manifold was covered in a black treacley deposit .. Sticky and horrible ..and this continued onto the valves and was obviously causeing the problem. Also this morning the valves had returned to their "Normal" position ....
One new replacement head later (started first time with a nice cloud of blue smoke from the oil in the bores) runs fine ...
I still don't know what caused it .. I put in contaminated fuel but there was no smoke (which I would have expected)
The tank of petrol before the contaminated one was the contents of Max's petrol tank (which was half full) with 1995 vintage 4Star (I assume) ... Could that have had anything to do with it ?
Still stumped ..
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Yucky treacle stuff - you really don't want that in the inlets!The inlet manifold was covered in a black treacley deposit .. Sticky and horrible ..and this continued onto the valves and was obviously causeing the problem. Also this morning the valves had returned to their "Normal" position ....
Well done for finding the problem, but as for the treacle from mixed fuels, that's a new one on me. (sugar in the petrol causes treacle but that would have wrecked the rings too....
I hope she runs well with the new head, but if it was me Id be crossing my fingers that the rings are not sticky as well
Ray. MMOC#47368. Forum moderator.
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
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where to break down next?
2013... managed to seize my 1275 just by driving it round the block
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block
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- Minor Fan
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I'll do a photo of the combustion chambers .. slight carbonisation but nothing scary ..rayofleamington wrote:Yucky treacle stuff - you really don't want that in the inlets!The inlet manifold was covered in a black treacley deposit .. Sticky and horrible ..and this continued onto the valves and was obviously causeing the problem. Also this morning the valves had returned to their "Normal" position ....
Well done for finding the problem, but as for the treacle from mixed fuels, that's a new one on me. (sugar in the petrol causes treacle but that would have wrecked the rings too....
I hope she runs well with the new head, but if it was me Id be crossing my fingers that the rings are not sticky as well
There is a garage locally that sells 4star (real not LRP) .. I'm going to use that for a few weeks and hope it gets whatever it is out of of it's system ..
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- Minor Fan
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