Engine Noise and still overheating... Video Clip inside

Well, I did what you guys recommended. New thermostat and coolant flush. I thought it was solved but I drove it a bit more today and it started to overheat again. Whats next? Water pump? Is there an easy way to test that?

Also have some wierd ticking, or knocking noises coming from the engine. I thought it may because of the octane but I put higher octane fuel and retarded the timing. Its most prevelant around 2k or higher rpms. It didnt used to do this so I dont think its normal. Maybe its related somehow to the overheating issue... Here is a video clip so you can hear what its doing:
http://www.youtube.com/watch?v=K8R840QGC7k

 

Do you see you antifreeze "churning" with the radiator cap off while it is running? Thermostat in right? Maybe need to "burp" your coolant system? Is there air trapped still in your tank? Belts tight? I am not too familiar with your specific engine, but all these have got me at one time or another.

Maybe post a couple of pics of your engine too.

 

Ok 1st things 1st, your motor is more than likely not a 225 but a 231, the valve covers are wrong and so is the intake manifold and carb.
The ticking sounds like a stuck lifter, some marvel mystery oil in the oil pan may help or eliminate it but the lifter may also be collapsed and need replaced. The water churning in the tank of the radiator would let you know the pump is pumping. Is this motor actually overheating or are you speaking of the temp gauge showing hot?

Looked at your jeep profile it states you have a dana 30 rear, are you sure? What about the dana 20 transfercase, it should be dana 18.

 

These specs are just what I was told. I just bought it last week so I am not sure exactly... maybe it is a 231. Is there any way to tell for sure?

Ill check on the coolant churning. I assume I have to wait for the thermostat to open, correct?

 

Ill check the coolant thing tomorrow.

As for the lifters, I took off the valve covers and noticed that the rockers mover around a bit. Then I saw that only a plastic tab was holding it to its place on the bar... Is this right? I usually see metal bolts on other engines. I took one off and it broke the tab that was holding it in place. I assume I can replace all these with something a little more sturdy...

 

If you have the plastic button it is definately a 231 and not a 225.
Nope the plastic tabs are stock and fine, you will need to replace the one you broke though. These little plastic buttons keep the rockers from moving to far right to left. They will last for 100k miles under normal circumstances. Other engines don't use rocker shafts, they use pedestals and the bolt holds them together. Don't confuse a Buick motor with a small block chevy.

 

thanks ,Mcruff. Do you know the proper name for those plastic buttons? Ill have to find a replacement and dont want to look like an idiot at the auto parts store...

 

sounds like a lifter. would check the timing/sparkplug gap on the overheating problems.

 

You know, there have been instances that a loose spark plug will make the same type of noise, as well as a bad exhaust manifold gasket or donut. Use a stethoscope, or even a looong screwdriver and "listen" to what is going on. ( I just recently went through this with my 88 GMC K2500 with the 5.7L, I thought it was a lifter, until I replaced the left exhaust manifold).

 

Well I did notice the water churning in the radiator, so the water pump must be working. Then I took off the valve covers to see about the lifters. Some were clicking but not anything drastic. Shouldnt oil be squirting into the valve cover area? I didnt notice anything distributing oil. I then took of the oil pan. I changed the oil a couple days ago and the oil had a metallic hue to it... I ran the engine for a second without the oil pan, and the loud click was defenetly coming from under the block. I inspected but everything seems to look ok. Would a stuck lifter cause that much noise from the crankcase? If I cant figure it out, I guess Ill just run the thing till something blows up.