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Registered
Join Date: Jul 2003
Location: Port Macquarie Australia
Posts: 510
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Look at my cylinder wall
Dismantalling my 3.3 I noticed a mark on the wall of cylinder #5. The mark is smooth and shiny. The cylinder is a low milage Nikasil.
 Any ideas what may have caused this? and do I need a new cylinder or will this hone out? Steve
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2008 BMW 320i 2006 Mercedes ML320 2004 Mercedes ML270 cdi 1998 Porsche Boxter 1988 Porsche 930 Targa (sold) |
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03-06-2005, 03:07 AM
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Irrationally exuberant
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If you can't feel it with your fingernail ("smooth and shiny") you're fine.
In the picture it looks like a line drawn with a permanent marker. -Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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03-06-2005, 04:42 AM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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Permanant marker (Sharpie) will easily come off with acetone or alcohol, not the kind found in bottles and cans.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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03-06-2005, 04:56 AM
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Licensed User
Join Date: Feb 2003
Location: ....down Highway 61
Posts: 6,505
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Sharpie
 Was that there when you disassembled the motor? Are the other cylinders marked 2-6? |
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03-06-2005, 05:32 AM
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Forced Induction Junkie
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It looks very close to the area of your top compression ring. I suggest pulling the piston and inspecting the ring for a shiney spot. It may have been a defect on the gap portion of the ring that caused the polished line on the cylinder. Is it a black line or the end result of something rubbing hard enough to wear the cross hatch pattern down and leaving a very smooth relective surface?
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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03-06-2005, 07:22 AM
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Registered
Join Date: Jul 2003
Location: Port Macquarie Australia
Posts: 510
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It looks like a black line in the photograph but is really a mirror smooth part of the cylinder wall. I agree that it appears to run close to the top of the cylinder and that its track would be very close to that of the top ring. Can't feel it with a finger nail.
I have a new set of geotze rings to go in so I'll pull the piston out and inspect the rings. It is odd that it has a slight yet well defined "squiggle" to it. The valves look ok, I can't see any eveidence of a foreign object.
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2008 BMW 320i 2006 Mercedes ML320 2004 Mercedes ML270 cdi 1998 Porsche Boxter 1988 Porsche 930 Targa (sold) |
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03-06-2005, 11:45 AM
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The Blue Pheonix
1985 Porsche 930 Fac. Slantnose 3.3l
