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Oil pump stud (tensioner) question.
I had the water pump stud that holds the tensioner on an 85.5 944 break. The stud is an m10x1.5. I think it is around 100 mm long.
The belt was properly installed and tensioned using the Arnworx tool. Have done many over the years and this is the 2nd stud I have seen break. I have talked with a couple of friends that have worked on many 944's professionally and they have experienced the stud breaking. One guy said I can tell you exactly where it breaks and that is where the stud comes out of the block and the thread ends. That is exactly where both the ones I have seen broke.
I have wondered if the bolt fatigues over the years. Would a harder rating work better? I think the stud is an 808 hardness.
If anyone has experienced this and has a good solution please post. I don't think Porsche has this part available new.
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