Because the end bolts aren't sealed from the water jackets. If regular coolant maintenance was done then you likely won't have much rust. Also happens to the 4 long water pump bolts that go all the way through the timing cover.Tomorrow's the big day that I start tearing into it to replace the lower intake manifold gasket and other bits.
That reminds me, I should go and spray down some bolts with PB Blaster.
I've read that the two front & two rear bolts on these manifolds often break on removal.
Exactly. I worked for an old mechanic when I was a kid in Michigan, and I don't remember him breaking rusty bolts very often. He was a master with bleeder screws, which always fucking break off with that Michigan rust. He had really long wrenches for them. I'm talking a 5/16th that was 8-10 inches long. He'd always try to get it to move just a bit tighter before going counterclockwise. Worked like a charm.Back and forth on the wrench AFTER smacking the head, AFTER atf/acetone. Tighten a bit, loosen a bit...repeat and stop just before the bolt breaks.
Ughhhhh the very first bolt.
I did first whack with hammer and tighten, then loo..... CRACK.
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Centering the bit is easy but the part that fucks me up is getting the drill bit to drill straight through. Do you kinda eyeball it with very small bits and step up, so even if its slightly off center (off axis?), with enough material removed the bolt can come out?If you center the pilot hole and gradually step up the drill bit size, you usually will get the bolt to back out before your bit fucks up the threads. The pilot hole is the important one.
That's how I do it. It's never perfect because I am not billetman or stites. But as you're taking material away, putting heat into it (simply by drilling), and spraying the shit out of it, what's left of the bolt always seems to break loose before the drill bit gets into the threads.Do you kinda eyeball it with very small bits and step up, so even if its slightly off center (off axis?), with enough material removed the bolt can come out?
There was a running joke that Hapo gave his Bravada to me.What did you give Hapo for the Bravada, a small beating? Whatever it was, it was too much! At least a sending unit should have a nice hole, right through the middle of it so you can jam a fukin' Easy-out in there and break it off too.