Re: throwout bearing carrier, crack?
There are two things on the casting of interest. One is the parting line that is talked about above on the outside of the part. The other is a line on the ID that may be a crack. The way to test is to use a dye penetrant or magnetic flux test.
In the dye penetrant test a fluorescent die is allowed to seep into the crack and then wiped off. A powder is then applied to draw out the die to be viewed with a black light.
In the magnet flux test a magnetic field is applied to the part and iron filings sprinkled on the part. The filings will cling to any area were there is a crack.
Either of these tests will tell you if you have a crack. If you do, I would recommend replacing the part.
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