Some metal in the oil
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Looks similar to what I see after piston or case break ups. Maybe cam shaft rev'd flexed to point it scooped out a bit of it own oil bath. Oil pump can digest that Al stuff no problemo I've found so the real issue is wet sumping if they clog sump drain or pump inlet. Check sump mag for sense of ferric wear and chips for decision of total tear down or just ride the snot out of it till its too obvious to ride.
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Looks like the radius of the curves on em match the primary chain rollers ?
I think its where someone slipped with that Screwdriver & Big Hammer .
:wink:
The Olde ' remove all Burrs & Sharp edges ' gets all bits of Flash & thin ( waffer ) thingos of the cases afore assembly .
Could just be a bit of ' Flash ' from the castings . . . maybe . . .
I think its where someone slipped with that Screwdriver & Big Hammer .
:wink: The Olde ' remove all Burrs & Sharp edges ' gets all bits of Flash & thin ( waffer ) thingos of the cases afore assembly .
Could just be a bit of ' Flash ' from the castings . . . maybe . . .
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Magnet w/o fur is a good sign. I'd send you my sonic spectrum analyzer to determine the part that changed signal with its mass change to decide how long to leave it alone or freak out to even turn over again till fixed, once I do a deal with Aerositch catalog. Only thing minor I can picture would leave more sand to dust type sediments not something that'd gag ya to swallow. Cam thrust washers can rub case, cam lobes should not. Piston don't usually leave chips before they just break to take out lots of things with them at once. Outer bearing races spun in their bores might create slag like chips. Maybe crank shim over done?
Would take a weekend to work down engine till open on the bench if need be, then if nothing a miss, just put it back and forgetaboutit.
I have shoe eves I leave poison out for now as they screw up stuff instead of fix up, even if I was good to them prior.
Would take a weekend to work down engine till open on the bench if need be, then if nothing a miss, just put it back and forgetaboutit.
I have shoe eves I leave poison out for now as they screw up stuff instead of fix up, even if I was good to them prior.
Aluminum main bearing shims look like that after being crushed and squeezed out if the bearing turns in its housing. Look for more or the rest in the filter (cut it open). Only a guess but it's a reason not to use aluminum for shims so if it's going to happen and it's steel the magnetic drain will collect most of it.
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Could be the aluminum/tin lining off the shell bearings which can peel off if the lining bond strength is low, but highly unlikely. If it oxides (dulls over a few days) then its aluminum and not from the bearing, if it stays shiney then more likely Aluminium/Tin due to the tin in the alloy. If the shell bearings are white-metal (which for a Norton I have never seen) then overheating can loosen the lining and fall into the sump, as this is a lead/tin based alloy it also will not oxidise.
Probably not in Concours's world but in my previous owners it was. Soft drink cans in aluminum are more prevalent than steel. It took me several oil changes and filters and an engine strip to find out where the aluminum flakes were coming from in mine.
concours
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Keith1069 said:
Old savage blacksmiths you say? lol or kids with no money/patience? I agree, anything is possible, crazy stuff happens.
The "concours" just refers to the Japanese copy of a K100 road bike, (GTR1000 in Europe?) my mile muncher 20 years. No affiliation with the fancy smancy car show
concours
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Sump filter is all intact, only a couple small pcs. of the alloy in the screen. I'm gonna try and go in the sump screen hole with the borescope tonight, anyone done so?79x100 said:
I've smeared a few pistons (two-stroke Chernobyl imitation)
You know, this material could have come from almost anywhere. It the tappet covers were off some thig could have blown in. Anywhere from the oil tank in. When appling the timing cover to the crankcase the dowel scraping into its hole. Almost anywhere!
Although they are bits in a place where they shouldn't be, they seem somewhat harmless to a point and the fact that you have them out is good. But this could cause you to lose your hair if you let it. You could go to the extent of a full rebuild and still not find the where of these bits originated.
Maybe just run a view quick cycles of cheap thin oit just to flush and see if anything else come out.
Although they are bits in a place where they shouldn't be, they seem somewhat harmless to a point and the fact that you have them out is good. But this could cause you to lose your hair if you let it. You could go to the extent of a full rebuild and still not find the where of these bits originated.
Maybe just run a view quick cycles of cheap thin oit just to flush and see if anything else come out.
concours
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pvisseriii said:
Agreed, soft metal no big yank, just wanted to know from whence it came. The borescope went in through the sump, all the way to the underside of the piston crowns. Bores looked great. Aside from the biggest peice shown, most all were similar sized. Only when I borescoped the top of the piston, did the mystery unravel...
The valve was closed while doing this...
But must have moved before I did this a couple days later
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Wow, a Commando engine impaled with a big fat tap. Took the whole RH exhaust off. How fast were you going when you hit it?
So you think that a chip or two got past the valve, into the combustion chamber, past the rings and past the skirt?
Was there any indication of anything abby normal inside. My first thoughts would be to look for discoloration or babbit puking out from one of the rod journals.
Is the plot thickening or do you feel you have a handle on this?
So you think that a chip or two got past the valve, into the combustion chamber, past the rings and past the skirt?
Was there any indication of anything abby normal inside. My first thoughts would be to look for discoloration or babbit puking out from one of the rod journals.
Is the plot thickening or do you feel you have a handle on this?
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Last two photo's do not compute to apply to Al slag in crank case if that's where the pieces found, unless of course the welding blew through piston crown which ain't likely. Slag down push rod tunnels would be trapped on top of lifters till pieces small enough to pass down the front liter bevel space. Pistons not likely d/t no siezure, Cam or crank spin rubbing case sides or bearing bores is about all that could make slag w/o ferric dust showing up or rod cap showing through cases. I've seen too much Norton Al welding now, so if there's any Al slag spilling you better go somewhere else.
How happy go lucky kid vs mature disciplined man are ya? Seems like most quessing game posts about some finding gives long lists of fualts to fine yet the final solution ain't any of em. We only have the time we are alvie, so its been depressing to me how much of it has been spent in recoveries vs riding.
How happy go lucky kid vs mature disciplined man are ya? Seems like most quessing game posts about some finding gives long lists of fualts to fine yet the final solution ain't any of em. We only have the time we are alvie, so its been depressing to me how much of it has been spent in recoveries vs riding.
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The Engines NOT supposed to be running , while You Tap that out . :wink:
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