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+--- Thread: Clutch housing, stress cracks or mfg. defects?? (/showthread.php?tid=7117)
Clutch housing, stress cracks or mfg. defects?? - JMBT - 03-03-2021
Hello all I got my transmission out the other day. It was covered in 810,000 miles worth of throwout bearing grease. When I got it all cleaned up today I noticed what looks like small cracks in various places all over the inner bell. (see pics)
I am looking for your opinions as to whether they are stress cracks or just manufacturing defects in the cast aluminum.
Thanks, JMBT
RE: Clutch housing, stress cracks or mfg. defects?? - Aussie Steve - 03-04-2021
(03-03-2021 )JMBT Wrote: Hello all I got my transmission out the other day. It was covered in 810,000 miles worth of throwout bearing grease. When I got it all cleaned up today I noticed what looks like small cracks in various places all over the inner bell. (see pics)
I am looking for your opinions as to whether they are stress cracks or just manufacturing defects in the cast aluminum.
Thanks, JMBT
Nothing to worry about. You'll those marks in a brand new housing. Most of them look like small imperfections from the casting method. I don't ever recall seeing one fail unless somethings gone wrong - clutch flying to bits from abuse, loose bolts etc.
RE: Clutch housing, stress cracks or mfg. defects?? - Rawze - 03-04-2021
Aussie Steve has it right ...
A lot of that looks like the typical crazing of an aluminum or cast-iron part that cooled too rapidly, or in an uneven fashion. - It seems to be fairly common.