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smells and smokes like oil -rear main seal?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wazzabie, Sep 30, 2001.

  1. wazzabie

    wazzabie 1/2 ton status Premium Member

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    I have a 305 connected to a 700r tranny. After the V8 heats up I get white fumes and burt oil smell comming from the rear of the engine. Itcomes up behind the back side of both valve covers. What could be leaking? It must be leaking onto the exust? I don't think it is leaking valve covers. Could it be rear main seal? I am not losing alot of oil though. Could a leak from were distruter gets oil cause this? Could this be cause by vacume problems. Before this happened my vacume pump went out and sent shavings up into the air intake. The filter stoped it but it went into the hoses.

    thanks

    feel free to reply
     
  2. EDdaTREE

    EDdaTREE 1/2 ton status

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    Sounds like the valve cover gaskets are leaking at the back-ends. Try a small mirror and a bright flashlight to check it.

    9/11/01..Never forget...Never forgive
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Check and make sure that your oil pressure sending unit isn't leaking. Are you sure it's not the valve covers? Generally a rear main seal will leak onto the ground. Have you found any spots on the driveway?

    Maybe I'm wrong, but I thought the only engines that had vacuum pumps were diesels.......



    <font color=blue> WE WILL NEVER SURRENDER<font color=blue>
     
  4. scooby

    scooby Registered Member

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    oil sender??






    " never to high "
     
  5. FWP

    FWP CRS

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    White smoke is usually tranny fluid or engine coolant. Oil is usually dark in color when it burns. Look for wet spots on the exhaust or elsewhere in the vacinity and see if you can trace it back from there. All the trucks and cars I have seen with a rear main leak drip from the converter pan/ dust shield onto the ground. Hope that helps some.

    <a target="_blank" href=http://coloradok5.com/gallery/75K5>http://coloradok5.com/gallery/75K5</a>
     
  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Your oil sending unit is found on the back of the motor on the driver's side(beside the distributor) It looks like a little silver or bronze can(about 3" long and 1 1/2 inches diameter) that threads into the block at about 45 degrees. There will be either one or two wires attached to the top(probably one). If oil is getting past the threads it can leak down behind the motor and fall onto the exhaust......



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  7. wazzabie

    wazzabie 1/2 ton status Premium Member

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    I never thought bout the oil sending unit. Most of the smoke is comming from the passanger side

    Is it possiblr that the distriboter is leaking oil?

    I am going to replace the valve gaskets - I don't think that is what is leaking but I am not sure.
     
  8. muddin4fun

    muddin4fun 3/4 ton status

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    You might pull the valve covers anyway and make sure none of those shavings made it into any of those holes in there and plugged them up. Do you have a mirror? You can go to eckerd and get one of those mirrors like dentists use that you can angle and swivle and look behind the engine. Maybe that'll help find it.

    <font color=blue>Women should put pictures of missing men on beer cans...</font color=blue>
    Website link is in my profile [​IMG]
     
  9. BlazinRojo

    BlazinRojo 1/2 ton status

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    i would change your valve cover gaskets....that solved my problem; however mine were very obviously leaking from the sides. Normally your rear main seal would leak onto the ground and not burn off. And in my experience, oil smoke is light blue/gray....at least mine was....but i had about 5 year old oil in it at the time... But also check the sending unit...that's a definite possibility.

    Shutup Brain or I'll stab you with a Q-Tip - Homer J. Simpson
     

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