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BTW, I saw you switched to a double roller timing chain. That's what I have. |
The oil pan scraper blocks removal of the main caps, but there is as much as I could show of #3. Any thoughts? I think the engine's got to come out at this point or I just won't feel good about driving it hard.
http://www.clubcobra.com/forums/pict...ictureid=16648 http://www.clubcobra.com/forums/pict...ictureid=16647 http://www.clubcobra.com/forums/pict...ictureid=16646 http://www.clubcobra.com/forums/pict...ictureid=16645 |
I don't see anything blatantly obvious.
Did you check crank thrust clearance? Very easy with the pan off. I'm still in favor of buttoning it back up, changing the filter and oil, and putting a few miles on it. |
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Bolt the cap back on, torque all the bolts, put a dial indicator on the crank snout, pulley, whatever is easiest, then take a screwdriver and pry in between a crank counterweight and the block, back and forth.
By the way, when the cap goes back on and the bolts are run down, pry forward on the crank while you torque the bolts. That helps set the cap and thrust bearing. |
I know that if it was mine it would be out - much cheaper than replacing the whole engine - I would tense up every time I took it over 3000 RPM.
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I don't think I'm going to enjoy driving it nearly as much if I'm constantly worried about the engine. I'm gonna pull it and have someone better than me figure out what that metal's from.
I appreciate everyone's help and suggestions and will report back when I find out what the issue was. It will probably be a month or so. |
dcdoug,
Id be happy to try and run chemistry analysis (free of charge) on the pieces to see if the material can be identified. Let me know Jason |
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DCDOUG, I'm thinking you are doing the right thing. No doubt you've got a whole lot invested in your SO and don't want to have it become nothing more than a boat anchor.
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Bearing material?
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I blew up a 351C about 15 years ago. It dropped a valve at about 5,000 rpms with a mostly stock bottom end. The pistons were cast, and they basically exploded - no kaboom, but there were aluminum bits everywhere.
Here's a pic of one of the rod bearings. It completely delaminated. That's all from one rod bearing - both halves fused together. Maybe you have something similar going on with a bearing, but not as catastrophic as mine. Here's the pic: |
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I think I would start looking at any bearings directly above the trap door area of the sump.
Wiggle the rods, one might be obvious. |
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Given what an engine like that is worth, I understand how unsettling it must be to risk serious damage. It is only minor money and time compared to what might happen. A complete freshening up the engine will not hurt anything. I cannot fault your decision.
If it turns out that was just some excess RTV sealant that came off, well so be it. Many a unknown problem was found looking for a non-problem. Good luck, and keep us posted. |
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I was pretty bummed, but I've made peace with it. |
Doubt this will make you feel better but my engine had less than 500 miles on the odometer when it developed a minor ticking. The noise wasn’t there when the engine was cold but after it warmed up to normal temps, it would start ticking. We ruled out any potential problem with the valve train and a few other things so before I did anything drastic, I decided to send an oil sample to Blackstone. The results were pretty bad; 166 units of copper (11 is avg) and 176 of lead (11 is avg) just to name a few and that was after running another 100 miles with fresh oil and filter. We pulled the engine, replaced lots of parts that wasn't properly assembled the first time, and the weekend of Memorial Day finally I got the engine back home. I'll spare you the details but will say I learned several lessons the hard (and expensive) way.
If it was mine, I'd change the oil like Brent mentioned but would also send an oil sample to Blackstone. The sample report should give you some insight to whether or not your bearings are going bad (like mine) or indicate if something else is going wrong. Good luck on whatever you decide to do! |
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I'm curious as to what the dings on the crankshaft are?
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