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General Category >> Rubber Side Down! >> Cam chain sawed my case
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Message started by srinath on 01/13/20 at 05:48:19

Title: Cam chain sawed my case
Post by srinath on 01/13/20 at 05:48:19

I wanted to ask you guys if this is a problem.
On the bike I am trying to rebuild, the cam chain had flopped around and sawed the case and it was something that seemed to only be mildly structural, it was a pretty shallow scratch. I had a guy weld and "fill" that trench and sanded it smooth. I have had the bike running since briefly, but since the full on parts collection and rebuild is on, would it be an issue in future as in if I get it hot and cold a few 100 times ?

Cool.
Srinath.

Title: Re: Cam chain sawed my case
Post by batman on 01/13/20 at 06:39:14

It might depend on the filler used. and the location of the damage ,if the location is down in the case and not in the cylinder / head area , I'd say you don't have to worry.

Title: Re: Cam chain sawed my case
Post by srinath on 01/13/20 at 07:04:12

5556435A5659030F370 wrote:

It might depend on the filler used. and the location of the damage ,if the location is down in the case and not in the cylinder / head area , I'd say you don't have to worry.

It was tig welded with whatever they use for cast aluminum, it was 10+ yrs, I forgot what its called. And the cyl is pretty high as well as lined by a steel liner, which was honed after this weld up was done, I think only the case had the cut, cyl was in affected.

Cool.
Srinath.

Title: Re: Cam chain sawed my case
Post by batman on 01/13/20 at 18:27:41

Huh? Your terminology is puzzling , the cases contain the lower end of the motor , the cylinder is above them containing the piston and cam chain run ,where is the damage exactly? The cylinder is subject to expansion ,about 1.5 mm (do you have faith in your welder?) the cases are only subject to oil temperature (300F at most).

Title: Re: Cam chain sawed my case
Post by srinath on 01/14/20 at 02:13:00

6E6D78616D6238340C0 wrote:

I don't believe my cyl assy was scratched up at all. So just crankcase.
I do have faith in my welder, a chunk of this crap isn't gonna fall off. But yes thermal expansion was where I was going, especially repeated cycles, it is pretty much the same cast porus material laid down by a welder, sanded to the same grittiness by me, and likely will take oil and age with the rest of it with heat cycles, but just wanted to look for any gotcha's.
Cool.
Srinath.

Title: Re: Cam chain sawed my case
Post by batman on 01/14/20 at 06:39:51

Well in that case I'd run it.