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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
No way a grade 8 bolt should let go in that application. Factory or aftermarket bolt? Did you meet a lot of resistance before it broke? Was the hole clear of FOD and oil? I would check the other side to make sure you didn't hydraulic a hole through the casting.
Harley must have gotten a cheap batch back in the 90's. This is from 1994, my other one was 1996, and my dad broke the same bolt on his 1997 putting that engine back together.
AH the finest chinesium money can buy. Just kidding. I imagine it has something to do with corrosion. Galvanic corrosion between two dissimilar metals will cause material transfer between the two and will weaken the bolt.
AH the finest chinesium money can buy. Just kidding. I imagine it has something to do with corrosion. Galvanic corrosion between two dissimilar metals will cause material transfer between the two and will weaken the bolt.
That is a plausible situation here, but I would argue how many other engines I've ripped apart with 1/4" x 20 grade 8 bolts that are just as hard as day one.
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Grade 8 my ***...
