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Burning Oil ? what seals ? stop it ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ColAdo82K5, Mar 10, 2002.

  1. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    Hey,
    I have a tired 350 in my truck and i believe it's starting to burn some oil. It doesn't leak it. trust me, i've done the seals. The question is, what causes an engine to burn oil and how can i stop it besides a new crate ram jet 502 ? is it the rings on the pistons or is it somewhere in the heads ?
    thanks guys
    blake
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Here's two things to consider(There's probably more but I'm not that much of an engine guy):

    1. Worn rings/worn cylinder walls

    2. Worn or missing valve guides

    Does the truck ALWAYS smoke? I've used a product called Restore with pretty good results on a straght-6 in and old Chev pickup. Other than that, it looks like you'll have to tear into the motor to find out.
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Do a compression check. If it comes up good it's valve guide seals. Looking $40 in parts. $50 for a special tool to do the job while the engine is together.
     
  4. Stomp

    Stomp 1/2 ton status

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    hehe, and a REAL PAIN IN THE A$$ if its the rings /forums/images/icons/smile.gif
    Do what I'm doing and go buy a block and an engine stand and paycheck to paycheck it together
     
  5. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    the engine doesn't smoke at all, but the oil level will slowly go down between changes. i will do a compression check soon.
     
  6. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    What are some of the details with the valve guide seals ? what does it take to put new ones in ? the new engine will have to wait, i'm in the middle of body work and some suspension suff.
    blake
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    When you say "goes down slowly" between oil changes, how much are you talking about. You can expect a SBC to go through 1 or 1 1/2 litres of oil between changes. "Using" oil is normal, but burning oil is not.
     
  8. dnboc

    dnboc Registered Member

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    Details would be great on replacing the valve guide seals, my 350 blows a large puff of white smoke when it seats awhile. Got a quote from local shop to redo the valve seals for $565 bucks, doing it for $100 would be great. Thanks
     

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