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1995 Chev 5.7l Worn Valve Guides

JWW8

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GMstrong Enthusiast

GMstrong

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Blue smoke at start up.If you left the thorttle say if you where going down a hill or something then get back on it,it will smoke blueish.The only way you can tell without breaking it down

JWW8 Enthusiast

JWW8

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Blue smoke at start up.If you left the thorttle say if you where going down a hill or something then get back on it,it will smoke blueish.The only way you can tell without breaking it down

 

 

Is it possible to have worn guides and not smoke?

GMstrong Enthusiast

GMstrong

Posted
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No.Because when the valve seals/guides go bad oil seeps past and leaks into the cylinder and burns which causes blue smoke.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
Blue smoke at start up.If you left the thorttle say if you where going down a hill or something then get back on it,it will smoke blueish.The only way you can tell without breaking it down

 

 

Is it possible to have worn guides and not smoke?

 

 

 

If you are going through oil and it is not leaking out, then you will have blue smoke sometimes. You may not be seeing it because you are looking at the wrong time. You may want to try replacing valve seals first though.

JWW8 Enthusiast

JWW8

Posted
  • Author
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Blue smoke at start up.If you left the thorttle say if you where going down a hill or something then get back on it,it will smoke blueish.The only way you can tell without breaking it down

 

 

Is it possible to have worn guides and not smoke?

 

 

 

If you are going through oil and it is not leaking out, then you will have blue smoke sometimes. You may not be seeing it because you are looking at the wrong time. You may want to try replacing valve seals first though.

 

 

I just had the valve seals and intake manifold gasket replaced. It still uses a lot of oil but I never see smoke.

Squirrely Enthusiast

Squirrely

Posted
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There should be some smoke at startup if the guides are gone. It may not be a cloud, but there should be something. At least until the engine warms up.

JWW8 Enthusiast

JWW8

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There should be some smoke at startup if the guides are gone. It may not be a cloud, but there should be something. At least until the engine warms up.

 

 

There is no visible smoke on start up or while driving and no leaks. Valve seals have been replaced, intake manifold gasket replaced, good compression on all 8 cylinders, and new PCV valve. What else could account for using 1/2 qt of oil every 300 miles?

GMstrong Enthusiast

GMstrong

Posted
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Yea bottom line is that if its not leaking on the ground then your burning it which means you will at some point see blueish smoke.

JWW8 Enthusiast

JWW8

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Yea bottom line is that if its not leaking on the ground then your burning it which means you will at some point see blueish smoke.

 

Will a leak-down test tell me if it is bad guides or rings?

  • 2 months later...
JWW8 Enthusiast

JWW8

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Guys, I just had a complete valve job and one head replaced which was cracked. The truck runs fine but is still using a lot of oil, 1/2 qt in less than 100 miles. Still no visible leaks and compression on all cylinders is between 125-135 lbs. Could the oil be getting by the rings with this good of compression?

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
Yea bottom line is that if its not leaking on the ground then your burning it which means you will at some point see blueish smoke.

 

Will a leak-down test tell me if it is bad guides or rings?

 

 

Leak down will not test guides. Leak down tests the closed cylinder, so everything from the valve seats down are "tested". If guides are really bad, you can kind of test them by putting compressed air into the cylinder with rocker arms off, and remove the valve spring, and measure the amount of deflection you get by pushing the valve stem from side to side (in line with rocker arm). It is not a scientific way, but will show if they are really bad. If you do not see blue smoke when under load, and do not have a leak, it pretty much can only mean valve guides. But to burn that much, you have to see the smoke. Have someone follow you down the road and see if they can see when it smokes.

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