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Mikes270dart

Mikes270dart

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Wanted to see why the 273 was running so poorly, I think I found out why. I can push the valves and unseat the valves except for that exhaust valve. I quess the motor is comming apart.
 

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I dealt with this before. My problem was a bad Cam believe it or not. The exhaust lobe was toast so the cylinder built up pressure due to the Valve staying closed and bent the push rod. I don't really see what else it could be. Someone else with more experience will chime in I'm sure. Good luck
 
If you can easily open the valves by pressing on the springs, your springs were done years ago.

Probably floated the valves allowing that pushrod to jump loose and get beat up.

I had a chev 350 that had springs that were so dead that the valves would float at 3500 rpms.
 
1968FormulaS340 said:
If you can easily open the valves by pressing on the springs, your springs were done years ago.

Probably floated the valves allowing that pushrod to jump loose and get beat up.

I had a chev 350 that had springs that were so dead that the valves would float at 3500 rpms.
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I agree with this possibility except It should have been obvious that after "getting on it" a miss developed. It would have been instant. I guess pulling the head is gonna be necessary.
 
1968FormulaS340 said:
If you can easily open the valves by pressing on the springs, your springs were done years ago.

Probably floated the valves allowing that pushrod to jump loose and get beat up.

I had a chev 350 that had springs that were so dead that the valves would float at 3500 rpms.
Click to expand...

X2 and I had a 350 Chev that the springs were so bad on it floated at 2000 rpm. I could push a couple down with one finger, LOL

OwdKasd said:
I agree with this possibility except It should have been obvious that after "getting on it" a miss developed. It would have been instant. I guess pulling the head is gonna be necessary.
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He said it was running badly. No need to pull the heads to change valve springs.
 
I pulled the head to see what the problem was with the valve. Removed the spring and had to use a rubber hammer to knock out the valve. It was stuck because of gum/varnish on the valve stem. cleaned it up and it moved freely in the guides. would this be caused by the stuff that they call gas these days or something else?
 
Mikes270dart said:
I pulled the head to see what the problem was with the valve. Removed the spring and had to use a rubber hammer to knock out the valve. It was stuck because of gum/varnish on the valve stem. cleaned it up and it moved freely in the guides. would this be caused by the stuff that they call gas these days or something else?
Click to expand...

Sitting alot and oil buildup on the stem will stick the valves in the guides like this. I might put that head back on and run some seafoam through the oil and a few quick oil changes should make it right.
 
seafoam is an oil additive that breaks up all the varnish and sludge. i have heard of putting diesel in the oil and running it like that for a short while. it breaks down all the crap inside the engine and breaks it loose. if you do either i would buy 2 or 3 filters (cheaper ones) and run it for like 10 min then change the first one then maybe half hour and change the oil completely and put new filter on.
 
Its Naptha, or "white gas" like coleman cooking stove gas. Check the label. I believe it has a major percentage of this. Go to Walmart and park in the farthest, most vacant spot you can find in the back. You buy a jug of clean oil and a filter, and 2 cans of Seafoam. Take the power brake hose off and stick it in one can, start the car for about 5 seconds until it all gets sucked into your intake. Shut car down and hit up the McDonalds in the store and have yourself a nice long lunch. Go back out and pour 1/2 of the other can in your oil filler, and the other half into your gas tank. Put your power brake hose back on and make sure no car parked behind you. Roll your windows up and start the car. Get it to a fast idle and watch as billows of white smoke start pouring out your exhaust. Rev the motor a few time and itll eventually start to burn off and the smoke will die down. Now get the hell out of there before the fire trucks start showing up. Drive it home and you'll probably want to change your oil. Its comical how much smoke this produces...
[ame="http://youtu.be/dQP51za9BmM"]SMoke out[/ame]
 
I had a couple buddies (back when I had a trans am) that would load up on the seafoam then take their cars down the highway, just for the looks they got. Good times.
 
Seafoam is a fantastic product. I have used it several times to clean carbon deposits from the intake tracts through the combustion chambers in the manor Pishta described. It does smoke A LOT when used like that. The first time I used it I was amazed at the smoke that it produced. It was day time and I did it and didn't think it would smoke that much for so long when I took it out down the highway. It was so bad that people had to slow way down and turn their headlights on and I wished I hadn't done it on the open busy road because I feel it creates a traffic hazard that is just plain dangerous. Never did it like that again. Got a buddy that lives out in the country and when I need to use it I go out there where their is no traffic.
 
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