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Aluminum debris in oil 14 Sep 2021 22:43 #855277

  • Koten4
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Hey guys, so I changed my oil recently and found this at the bottom of the pan. Its the first time im seeing this and its kind of a mystery to me because the engine seems to be running fine and the transmission shifts fine as well. The bike is a KZ750N that has 8500mi and as far as I know has never been torn apart. All of the pieces seem to be aluminum and I am posting these hoping that someone may have an idea what it could possibly be. This is probably wishful thinking but I am hoping that it is something i can catch before it causes major engine damage. Thanks 
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Aluminum debris in oil 15 Sep 2021 04:06 #855284

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I fixed your pictures to be full size.Next time click the insert all tab to complete installation ..
Top picture looks like part of a snap ring   , and case piece 
 

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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Aluminum debris in oil 15 Sep 2021 06:04 #855291

  • martin_csr
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I would make a best guess on the diameter of that curved piece, then go thru the diagrams at partzilla.
some parts are listed w the size. there are only x number of things it could be, so it shouldn't be too hard to narrow it down.
Clutch, gear change & transmission are a few you could check first.

www.partzilla.com/catalog/kawasaki/motor...982/spectre-kz750-n1

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Aluminum debris in oil 15 Sep 2021 09:31 #855298

  • Scirocco
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The oil pan is recording the histroy of any engine life and condition.
An oil change didn´t really remove all sludge and debris.

 
 

It´s an easy task to remove and cleaning the oil pan and oil pump filter screen.

 
 
 
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Aluminum debris in oil 15 Sep 2021 10:10 #855301

  • Mikaw
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I fixed your pictures to be full size.Next time click the insert all tab to complete installation ..
Top picture looks like part of a snap ring   , and case piece 

 

I was thinking trans lock ring. But I agree the bits of aluminum have to be case debris 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
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Aluminum debris in oil 15 Sep 2021 12:49 #855307

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Im curious  what violent  event  happened inside the  cases to cause this  fragmenting  , But is allowing  the motor to still be running and shifting properly.
???
Did it happen during  initial  break in and was just discovered???
Or was it the result of a trans malfunction  trying to push out a  shaft / gear or shift fork 

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Aluminum debris in oil 15 Sep 2021 16:03 #855312

  • Koten4
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I currently have the oil pan out of it, and it seems like everything was flushed out when I drained the oil. I will try to look around to see if I can spot anything obvious. Should I also remove the clutch cover while i am at it? 

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Aluminum debris in oil 15 Sep 2021 19:15 #855319

  • SWest
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Looks like #2 ring. How many miles, year/model of bike?
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Aluminum debris in oil 16 Sep 2021 07:24 #855333

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Looks like #2 ring. How many miles, year/model of bike?
Steve

KZ750N              8500 Miles

I thought about rings from appearance  of part , but  would it still be running  good ????????????????
Only a teardown this winter will tell the tale 
Dave
 


Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Aluminum debris in oil 16 Sep 2021 07:34 #855334

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Could be debris after last tear down that's why I asked.
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Aluminum debris in oil 16 Sep 2021 12:01 #855345

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Shot in the dark, but maybe the debris is from the factory? I'm not positive but on my N1 engine it looks like the cases were painted before the surfaces were milled. The flakes in your oil look goldish, so I dunno. Hard to tell the size from a photo though.
1982 KZ750 Spectre - Dyna 2.2 coils + 8mm wires, WG coil relay, SH775 R/R, Mikuni BS34s - 40P/122.5M, Progressive fork springs/KZ900 rear shocks, Vance & Hines 4-1

1982 KZ305 CSR - 18" KZ400 rear wheel

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Aluminum debris in oil 16 Sep 2021 14:32 #855350

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Looks like #2 ring. How many miles, year/model of bike?
Steve

KZ750N              8500 Miles

I thought about rings from appearance  of part , but  would it still be running  good ????????????????
Dave
Looks more like a piece of piston ring to me also,  the snap rings are all flat and not that big of diameter.   But again,  it shouldn't/couldn't be running properly with a piece of piston ring missing.  I think Steve's guess about a previous repair makes sense.  That piece of aluminum has been bouncing around for a while!

Mike



 

Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1A (disassembled)
1976 KZ900B LTD (SOLD!) it's in GOOD Hands!
1978 KZ1000 LTD
1976 KZ900B LTD pile O parts!
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Last edit: by krazee1.
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