Reuse the cam?
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Junior User
Joined: Nov 2003
Posts: 99
Likes: 0
From: Oregon
Reuse the cam?
I just had a little bit of a catastrophic failure the other day. I'd finally gotten the rest of the parts to put my new engine in my truck, got it installed, cam broke in, drove it home from my parents house. On the way to work, it threw a rod, goin 50 or so. Is the cam likely to be reusable, seein as how it has all of an hour of use? I have 2 more blocks lyin around, could probably get one of 'em cleaned up and get new parts, but I really liked the way the engine ran when it did. Any advice is appreciated.
-Jonny
-Jonny
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Mark the lifters to the cam lobe location, you should be ok as it's a short run.
Lifter bores and angle variations are small between blocks. Check the cam for any damage from the rod. Rod break or a bolt failure? What rpm's were you turning before the "boom"?
.....=o&o>.....
Lifter bores and angle variations are small between blocks. Check the cam for any damage from the rod. Rod break or a bolt failure? What rpm's were you turning before the "boom"?
.....=o&o>.....
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 99
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From: Oregon
My best guess at this time is either bolt failure, or i missed a rod torquing the bolts, as it was an ARP rod bolt set on a balanced assembly. Haven't torn into it just yet, though, so I haven't found out. I was still hoping it was just the intake gasket blowing between a water jacket and the exhaust crossover until i went to try and turn it by hand today, when i turned it backwards to get it at TDC to remove the dist. I heard something with a lil bit of weight drop to the bottom of the oil pan. Plus, it seemed like the entire cooling system had emptied into the oil, so the block purely a conversation piece now. She must've been turning 2600 or 2700 when it happened...50 mph with 4.1 rearend an a C6, my observed 65 mph was right around 3000 before. I'm just really hoping the piston didn't hit the valve too dang hard, or that the pushrod bent before the cam got damaged.
Senior User
Joined: May 2004
Posts: 278
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Well,
If you do find that the rod went and the block is trash,
You could probably get away with reusing the cam but I would either replace the lifters or pull them apart and make sure there is no junk in them.
Let us know what you find.
Good luck.
Ken
If you do find that the rod went and the block is trash,
You could probably get away with reusing the cam but I would either replace the lifters or pull them apart and make sure there is no junk in them.
Let us know what you find.
Good luck.
Ken
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
"make sure there is no junk in them", that applies to brand new lifters. I have seen particles inside from the manufacture as well had one clack because of metal slivers in the check valve.
.....=o&o>.....
.....=o&o>.....
Thread Starter
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Junior User
Joined: Nov 2003
Posts: 99
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From: Oregon
Still haven't pulled the dist, just was turning the motor by hand to remove it at TDC when the clunk came. So in other words, if that was the oil pump shaft, it's in 2 or more pieces. I got the day off tomorrow(for my birthday, of all things), So I'm tearing into the engine then probably. The other thing, I found out from the guy I got it from that the engine threw a rod when it was in the '65 T-bird. Said it was tested and checked for cracks, but I wonder if it's the same cylinder, maybe I didn't mess up in my assembly, who knows. I'll post more when I know more!
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Junior User
Joined: Nov 2003
Posts: 99
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From: Oregon
Well, good news and bad news. Good news is I didn't mess up, all the rods were firmly secured to the crank, so I didn't forget to torque one or nothin like that. The bad news...no.7 cylinder tried to eat an intake valve for breakfast, and the entire engine is a total loss. It kinda looked like somebody removed the head, dropped a grenade down no.7, and put the head back on. Anyhow, time's a-wasting, gotta hunt down parts in a hurry.
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