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That sounds like a metal rotational noise to me.--something is screaming for oil
When you crank by hand it doesn't sound abnormal at all when we did the pressure testing it didn't sound bad either. I've used a stethoscope on pretty much everything I could think of but it still sounds bad. It didn't originally sound this bad either only when we changed the gasket again it came up but it wasn't bad. It just got worse and worse. It also idle's better than when we had the first gasket in. I think it slowly developed from something I don't believe it could be the manifold because it doesn't die out and it is so loud.
I didn't see before---what gasket was it that you changed before starting to hear this?
I am of the negative sort, so don't take this the wrong way... It sounds really bad. I wouldn't run it for very long each time you are trying to diagnose it. Since you are probably thinking the worst-engine, make sure to check all the little things first. Sometimes panic and fear of catastrophe can cause us to create one.
1) My first suggestion is to take the belts off and turn it on and see if you still have the sound. You might get lucky and have it be an accessory. Was there coolant in the engine? Or maybe the AC was empty if you have one.
2) Next suggestion is to cut a length of hose and put one end to your ear and poke around the engine with the other. You would be surprised how well this works. You can also use a long screwdriver for this, but it only works on solid objects-waterpump, head, etc. It doesn't just pick up noise in the air very well.
3) Since you said the sound is coming from the rear of the engine, maybe you could get lucky and it is a seizing distributor bushing. If you can't isolate the sound with the hose, you might try pulling the dizzy and turn it to see if it is rough.
4) Any chance that the flywheel/clutch is somehow installed wrong? Maybe one of these components is what is causing the noise. I could see a too long bolt rubbing or something like that happening back there. Maybe the ring gear rubbing on the engine or bell housing.
Anyways, those were my ideas before I drained the oil and looked for metal shavings. I hope it all turns out well.![]()
Which gasket?
I also posted in the "what have you done to your cruiser this week" thread:
could you have a busted water pump ? they grind metal on metal when they go - don't ask me how I know![]()