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Offline Sparked

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Any Ideas
« on: July 22, 2009, 04:55:58 PM »
Found this in my oilpan of my CB350F,  250 miles after rebuild.  I'll post more info when I have time tomorrow, hopefully with more pictures as well.  it is a part of aluminum casting about 2" diameter
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1961 Ford Falcon (time for four wheels)

Offline Sam Green Racing

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Re: Any Ideas
« Reply #1 on: July 22, 2009, 04:59:25 PM »
 :o :o :o :o :o :o :o  ???
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Offline bucky katt

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Re: Any Ideas
« Reply #2 on: July 22, 2009, 05:14:02 PM »
you sure thats not a chunk of compression ring?
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Offline mystic_1

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Re: Any Ideas
« Reply #3 on: July 22, 2009, 05:26:22 PM »
Quote from: bucky katt on July 22, 2009, 05:14:02 PM
you sure thats not a chunk of compression ring?

The right side of the photo sure does look like it has a square cross section, but the left side looks different... smooshed?

mystic_1
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Offline Sam Green Racing

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Re: Any Ideas
« Reply #4 on: July 22, 2009, 05:30:11 PM »
Quote from: bucky katt on July 22, 2009, 05:14:02 PM
you sure thats not a chunk of compression ring?

Aluminum compression ring ;D ;D ;D ;D ;D have you been on the hard stuff fuzzy :D :D :D :D :D

Sam. ;) ::)
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

technojock

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Re: Any Ideas
« Reply #5 on: July 23, 2009, 01:46:53 AM »
FWIW, It looks like part of the head gasket but it's hard to tell for certain.  It's possible that it dropped into the case when cleaning up the remains of the old gasket.

Tony
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Offline greenjeans

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Re: Any Ideas
« Reply #6 on: July 23, 2009, 06:19:05 AM »
Maybe part of the ring that holds the screen together ?
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Offline turninwheels

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Re: Any Ideas
« Reply #7 on: July 23, 2009, 06:29:38 AM »
huh....that can't be good :o
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Offline Sparked

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Re: Any Ideas
« Reply #8 on: July 23, 2009, 04:55:50 PM »
Ok, here are some better pictures of the part that I found.  It is cast aluminum.  I'm almost thinking of the edge of the snap ring groove on the bearings for the primary shaft?  Also with the amount of aluminum shavings in the oil pan and filter how much of a cleanup job am I looking at.  I've got my fingers crossed for not having to do another full tear down, but if I have too... there's got to be improvements I could make the 2nd time around.

















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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)

technojock

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Re: Any Ideas
« Reply #9 on: July 23, 2009, 05:15:05 PM »
After seeing the better pix and hearing about the shavings, I don't see how you can get away without tearing into it.

Tony
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Offline Sparked

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Re: Any Ideas
« Reply #10 on: July 23, 2009, 05:45:01 PM »
 :-[

Yeah, Soon as I saw what was in the oil pan I came tothe same conclusion.  I'm really curious what happened and why too. 
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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)

Offline honda750k

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Re: Any Ideas
« Reply #11 on: July 23, 2009, 05:56:41 PM »
I have no idea what that came from, but you've got SOMETHING not right, judging by the aluminum shrapnel all over that oilpan, and surrounding everything else.
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Offline mystic_1

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Re: Any Ideas
« Reply #12 on: July 23, 2009, 07:22:07 PM »
Congrats on having some of the more mysterious sump pan debris I have seen.

One would think that whatever forces broke off that piece, would have distorted it more.

Keep us posted on what you find.

mystic_1
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"A ship in harbor is safe, but that is not what ships are built for."
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline Sparked

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Re: Any Ideas
« Reply #13 on: July 23, 2009, 09:25:35 PM »
Well, soon as I get some free time I'm going to pull the engine and open it up to see what happened.  It was running oh so nice up until.....ouch
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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)

Offline Sparked

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Re: Any Ideas
« Reply #14 on: January 25, 2010, 06:29:52 PM »
So I got the engine all apart and between 2 I am building one.  I don't have the space to rebuild it myself at the moment so I'm having a local old bike mechanic do the assembly for me.  The shrapnel came off the inside of the case by the inner primary shaft bearing.  The bearing is fine, so we are kinda stumped as to why the snap ring would have sheared off the retaining flange.  It's such a clean break from the case that I'm wondering about just a failure in the casting.   So looks that by the time the snow is off the ground, I'll have a freash built bike ready for the season early this year.
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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)

Offline Sparked

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Re: Any Ideas
« Reply #15 on: September 18, 2011, 09:51:33 PM »
The engine wasn't worth rebuilding, but after 2 years of patiently waiting I have found a low(ish) mile barnfind bike with a solid engine in it.  The project is back underway!!!
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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)
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