Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Oil Cloud???

Discussion in 'The Garage' started by earlthek5, Nov 2, 2004.

  1. earlthek5

    earlthek5 Registered Member

    Joined:
    Aug 25, 2004
    Posts:
    12
    Likes Received:
    0
    I have a 79 with a SB400 and I am getting some oil smoke. I figured that it was the valve guide seals, so I had those changed out. That fixed the problem, and two days later I got on it pretty hard in 1st and she started to smoke again. What do you think could be wrong, maybe valve guides, rings, or look elsewhere??? Also, when it is just sittin, it blows a little smoke, and when you romp on it, it blows a HUGE cloud. I don't know??? /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/thinking.gif
     
  2. TrcksR4ME

    TrcksR4ME 1/2 ton status

    Joined:
    Feb 11, 2002
    Posts:
    2,482
    Likes Received:
    0
    Location:
    Seattle, WA 98103
    Probably rings, how many miles on it? Sounds typical of an engine thats about used up, have you lost some power as well?
     
  3. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,583
    Likes Received:
    945
    Location:
    Massachussetts
    It could be the rings--or a piston--my six cylinder died rather suddenly with no real warning,started huffing oil out of the breather,pushed the PVC valve right out of the valve cover,and smoked like a chimney out the tailpipe--all I could find wrong upon teardown was a small chunk of the #6 piston was missing at its outer edge--you could see the top ring!.I assume spark knock had beaten the piston so much it finally cracked a peice of it off. /forums/images/graemlins/confused.gif
    I'd check and make sure the PCV valve has good vacuum,and its hoe isnt collapsed,kinked,or blocked at the nipple where it goes to the carb or intake before blaming the rings--a compression test may help pinpoint a problem in the rings,but I've had a few chevy motors that showed excellent compression,but still smoked pretty bad--I concluded the oil control rings were worn,but the compression rings werent.Or maybe the pistons were too sloppy a fit in the cylinders,making the rings work overtime keeping the oil down in the crankcase.
    I have seen more than a few engines start using oil or smoking after the owner put a set of aftermarket vale covers on that didnt have a breather hole,causing the PVC valve to suck air past the rings,bringing oil with it,and it burns in the combustion chamber--makes lots of smoke.Bad intake guides will let enough oil down onto the piston to make a good cloud when you first start it up,then it will subside after a minite or two--even new valve stem seals wont cure loose guides,but this is usually more of an annoyance than a serious problem--the 86 305 I put in my 79 C10 does it every time I start it--I'm not too concerned--the "chevy puff" is common among many small blocks. /forums/images/graemlins/crazy.gif
     
  4. Mreetz

    Mreetz 1/2 ton status

    Joined:
    Jun 26, 2001
    Posts:
    1,282
    Likes Received:
    0
    Location:
    Subs of Denver, Colorado
    my 305 has the puff!
     
  5. mr_beer

    mr_beer 1/2 ton status

    Joined:
    Sep 10, 2004
    Posts:
    325
    Likes Received:
    0
    Location:
    Mt. hermon LA
    Sounds like rebuild time /forums/images/graemlins/doah.gif
     

Share This Page