SOHC.co.uk Forums > CB750

Crankcase disaster.

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Johnny4428:
I had a nice simple job to do this afternoon, splitting the 750 crankcases. By the time I cleaned the lairs of chain grease from the back of the engine I got a dirty drop, this bike has suffered at some time from a broken drive chain.
It’s going to be fun trying to take these apart!

Trigger:
I have seen loads of them in my workshop  :o

hairygit:

--- Quote from: Trigger on January 23, 2021, 02:52:19 PM ---I have seen loads of them in my workshop  :o

--- End quote ---
And you've done some very nice tidy repair jobs on them!

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SumpMagnet:
Has that been welded across the crankcase joins?

My eyes could be deceiving me here.....but I have seen some oddball stuff done that defies logic.

I guess the guy just wanted a quick fix to stop the oil falling out, and didn;t want to take the motor out of the frame and go to the trouble and expense of having it done right.

Johnny4428:
Yes the repair has been done with the engine in one piece. The need to get in the inside has just become a lot greater. Maybe small diameter cutting disc to get the thing opened up, following the line of crankcase seams. Bolt broken in the sump as well flush with crankcase but managed to remove with small pin punch and hammer.

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