Technical > Matt Shaff's Engine Shop
Lost cam dowel - what to do?
masracingtd1167:
Makes you kind of wonder what else they may have forgotten ! If it was my motor I would take it apart !
Dunc the Funk:
We checked the gear drive & it looks ok, there is a light witness mark on the crank sprocket. The oil pump has definately ingested some small hard bits of metal, it has a few pits & scores but nothing bad enough to worry us, clearances are ok. Dodged another bullet though, while checking out the top end I spotted a crack in a lifter. New set of lifters in now. The guy who freshened it for us has a lot of experience with BBCs but not with blown motors which is why he didn't tighten the crank hub bolts enough. I think I might rebuild it myself next winter for peace of mind.
dreracecar:
Wow, I was unaware that there was a difference in torque--- learn something new everyday
Dunc the Funk:
I've been told the 3 cam bolts need to be torqued to 45 lbf.ft to prevent them from being shaken loose. Thats tricky because you can only get a ring spanner on, not a socket. I may have to weld a bar or tube to a spanner & hang a weight on the end! ARP recommended torque for the bolts is 32.
dreracecar:
45# on a .250 bolt has already stretched it
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