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casing deformities
- Thread starter amishmike23
- Start date
jd750ace
Front Toward Enemy
Very typical of these cases. Nothing to worry about unless they spew oil!
amishmike23
XS650 Enthusiast
thanks for the quick reply. I just noticed that this motors cases are different than the ones I have in the bike right now. then again the cases I'm buliding are from a 77-79 and the cases in the bike are 81 that's prolly why they are different and when I bought it it held oil so hopefully all will be good.
jd750ace
Front Toward Enemy
It's come up several times. Can't recall anyone ever had one be anything but casting flaws. No worries.
Normal, behind the LH cylinder is a very popular spot. More common near radius's and corners.
A couple of random quotes from the web about a "supposedly" cracked Miata oil pan.
"Both of the oil pans that I checked have minor flashing or webbing around the drain plug from the diecasting process. Molds used to diecast aluminum frequently develop spider-web cracks in the surface (heat checking) that transfer to the parts being cast. These lines look like cracks at first glance.
"
" I work for a company which designs and manufactures diecast tooling for various industries including automotive. Depending on factors such as severity of thermal cycling, part shape, die design, heat and surface treatments, etc.., die inserts will eventually start to heat-check. As diecasters come under ever-increasing economic pressures they tend to run more shots through their dies before a rebuild. It is not uncommon to see heat-check flashing on die cast aluminum parts these days. "
A couple of random quotes from the web about a "supposedly" cracked Miata oil pan.
"Both of the oil pans that I checked have minor flashing or webbing around the drain plug from the diecasting process. Molds used to diecast aluminum frequently develop spider-web cracks in the surface (heat checking) that transfer to the parts being cast. These lines look like cracks at first glance.
"
" I work for a company which designs and manufactures diecast tooling for various industries including automotive. Depending on factors such as severity of thermal cycling, part shape, die design, heat and surface treatments, etc.., die inserts will eventually start to heat-check. As diecasters come under ever-increasing economic pressures they tend to run more shots through their dies before a rebuild. It is not uncommon to see heat-check flashing on die cast aluminum parts these days. "
Uncle Bryan
XS650 Addict
Here's mine, same thing, don't worry
Look, we even have the same cracks in the same places.
Look, we even have the same cracks in the same places.
Uncle Bryan
XS650 Addict
BTW, they're not really cracks, its just slag from the casting, as Gary already said.
