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New (to me!) '77 CB400F - US model

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paul G:

--- Quote from: mattsz on July 01, 2020, 12:04:36 PM ---Finally, the oil pan appears to be cracked (hmm... thumbnail upside down again?):

(Attachment Link)


It’s not, however, in the “usual” spot, around the drain hole.  Plus, no matter how carefully I look, I can’t see any evidence of it on the inside:

(Attachment Link)





Is it possible that there’s some sort of fracture that doesn’t go clear through?

--- End quote ---

I would get that welded up anyway or bin it and get another.
If that goes while you are riding then its a cert the rear Tyre is going to get a coating of its contents :o

Bryanj:
It could just be a casting flaw

mattsz:

--- Quote from: Bryanj on July 02, 2020, 03:09:01 PM ---It could just be a casting flaw

--- End quote ---

Have you seen this sort of thing before, Bryan?  If the lack of visible cracking inside the pan isn't convincing, would a "gravity" petrol leak test tell you anything?

Bryanj:
I see casting marks all the time petrol on inside may show a leak or you could see if anybody local to you in engineering has a dye crack detection kit but if you are real worried can you not get a used one

mattsz:

--- Quote from: Bryanj on July 02, 2020, 04:02:30 PM ---I see casting marks all the time petrol on inside may show a leak or you could see if anybody local to you in engineering has a dye crack detection kit but if you are real worried can you not get a used one

--- End quote ---

I know some engineering types who may be able to help with leak testing.

I wouldn't say that I'm "worried," since the inside looks fine to me.  I've shopped used ones on Ebay (US), not much there that isn't in worse shape than mine!  I'm actually more worried about the shrapnel that I removed from the sediment in the pan!

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