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Thread: 4agte Oil pooling on top of pistons

  1. #1
    Junior Member Grease Monkey
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    Default 4agte Oil pooling on top of pistons

    This seems to be an endless battle for me of my car blowing smoke, the botom end has only done 1500km, and it started to blow smoke. thinking it was the turbo i replaced it and the manifold, but that was no such luck it was still pooring smoke out, when i pulled the spark plugs out there was oil pooled on top of number 3 and 4 cylinders (my logic is that if it is on top of the piston when it is shut down, it would have to come from the head), so i ripped the head off and found oil on the valve stems in the ports of #3 and 4. The reco place said that the valve stem seals had died in that 1500km, so i had a full reco on the head and put genuine valve stem seals in this time, just got it all together warmed it up and took it for a spin and it then started to blow smoke, then when i pulled up and let it idle it just kept pooing out. I pulled the plugs out, but this time found oil pooled on all 4 cylinders!
    any thoughts? think they have done a dodgey job on the head? or put the valve stem seals on the wrong sides??

  2. #2
    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: 4agte Oil pooling on top of pistons

    valve stem seals are all the same so the cant go on the wrong side..... they could have come off again which is unlikely unless they are using the wrong seals?

    What is the compression like ?? I know there is heaps of oil but try to get a reading.

    Who built the bottom end ? what rings did you use..... dont say chrome molly !
    Are the oil rings on correctly ?

    Stupid question but the gasket is on the right way ?? with the major oil drain lined up correctly --- this would be very hard to stuff up....... but not impossible.

  3. #3
    Forum Member 1st year Apprentice
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    Default Re: 4agte Oil pooling on top of pistons

    how much boost are you running?


    30psi : the boost usualy stops the smoke on VS seals, and its unusual for 4 to go at once.

    have you got a breather bottle? try venting you pcv to the atmos. ( you will have to block the manifold port off. your oil isnt overfull is it?

    last but not least as 30psi said check the compression ... headgasket?

  4. #4
    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: 4agte Oil pooling on top of pistons

    hmmmm thinking a little about this......

    To get oil on all 4 cyls..... it could only be a few things...

    Stem seals wrong.... its unlikely they would all come off.
    Rings--- compression should hopefully give a indication here... but with the amount of oil it could be hard .

    cracked head.... it would have to be a major crack to leak in all 4...

    I have had this happen to me on 2cyls (2 & 4 ) many many years ago when i e=was boosting the NA 4age..
    The pistons hate it !!! even the slightest bit of detonation will crack the ring land and piss oil everywhere !!

    What does it run like apart from the smoke ?

  5. #5
    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: 4agte Oil pooling on top of pistons

    Quote Originally Posted by xlr8_07
    how much boost are you running?


    30psi : the boost usualy stops the smoke on VS seals, and its unusual for 4 to go at once.

    have you got a breather bottle? try venting you pcv to the atmos. ?
    4a;s dont have a pcv.
    It wont be boosting at idle...... or on light cruise

  6. #6
    Forum Member 1st year Apprentice
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    Default Re: 4agte Oil pooling on top of pistons

    i had a 3sgte running a 3sge rocker cover and the "filter unit" if you like before the air escapes the cove wasnt sealing and there was just enough blowby to pour oil out the vent hole ( needless to say the turbine was well lubricated ...... that also brings me to think, is there any oil in the intake tract? if so where dose it start ?

  7. #7
    Junior Member Grease Monkey
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    Default Re: 4agte Oil pooling on top of pistons

    there was 2 different valve stem seals in the genuine kit, black and a really dark brown. apparently the black is intake and brown exhaust.
    heap gasket is deffinatly on the right way, triple checked that after a mate did his wrong a little while ago.

    i did a compression check before i took the head off for the reco, from memory the reading was around the 1000kpa mark, though il have to check that tomorrow, they were all within 10kpa of each other though

    i put the bottom end together, and lined the rings up as per the toyota manual. just used the standard acl rings (not chrome)

    it seams to still be leaking more in cyl 4 and 3 then the other 2, 4 being the worst

    but it seems to run absolutly fine except for the smoke, think my boost guage is wrong, but it only hit 2pound

  8. #8
    Junior Member Grease Monkey
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    Default Re: 4agte Oil pooling on top of pistons

    also ive got the crank case ventilation to a catchcan then to the intake, it was the first thing i disconected and didnt make a difference

  9. #9
    Junior Member 1st year Apprentice
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    Default Re: 4agte Oil pooling on top of pistons

    Could possibly be a crank case breather/vent issue, one really simple check is to take the oil cap off to help relieve crank case pressure when the engine is running, and see if this changes the amount of smoke being blown out (if it has excessive oil in the cylinder's it may take a while to burn off)

  10. #10
    Senior Citizen Chief Engine Builder "Z" UTE's Avatar
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    Default Re: 4agte Oil pooling on top of pistons

    Did the head service include:

    Check for bent valves (they will make short work of new seals)

    Check for worn valve guides (they will allow valves to move, and destroy seals)

    cheers Chuck.
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  11. #11
    Building Corollas Chief Engine Builder Cuzzo's Avatar
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    Default Re: 4agte Oil pooling on top of pistons

    Did you plumb the intake into the inlet of the turbo or inlet of the manifold(ie factory NA location)
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  12. #12
    Junior Member Grease Monkey
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    Default Re: 4agte Oil pooling on top of pistons

    apparently they checked all the valves and guides

    and the crank ventilation goes in before the turbo, i blocked the factory hole on the inlet plenum

  13. #13
    Junior Member Grease Monkey
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    Default Re: 4agte Oil pooling on top of pistons

    just found the compression results, they were 930,940,930,925kpa

  14. #14
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    Default Re: 4agte Oil pooling on top of pistons

    whats wrong with chrome molly rings 30psi ?, ive never had a prob with them.
    i dont have a funny or cool signature.

  15. #15
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    Default Re: 4agte Oil pooling on top of pistons

    what oil pressure are you getting to your turbo?

    check all your intake piping, from post catch can to post turbo , if there no oil post catch can, and no oil post turbo, then you can rule that out.

    but i get the feeling its coming in through the intake somewhere.
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