Clutch housing, stress cracks or mfg. defects??
03-03-2021, (Subject: Clutch housing, stress cracks or mfg. defects?? ) 
Post: #1
Clutch housing, stress cracks or mfg. defects??
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


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03-04-2021, (Subject: Clutch housing, stress cracks or mfg. defects?? ) 
Post: #2
RE: Clutch housing, stress cracks or mfg. defects??
(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.
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 Thanks given by: JMBT , Signature620 , Rawze
03-04-2021, (Subject: Clutch housing, stress cracks or mfg. defects?? ) 
Post: #3
RE: Clutch housing, stress cracks or mfg. defects??
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.


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 Thanks given by: JMBT




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