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  1. #1
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    Default rebuilt engine smoking !

    hi everyone, have just had bottom of engine proffesionally rebuilt by reputable firm. rebore, new flat tops and rings, new cam, lifters, balanced crank etc. i fitted 2 new pro torker heads with new springs and 1.6 rockers and new pushrods topped with a weiand intake and new holley. car goes really well but alas starts to smoke heavily after she warms up. evidence shows oil in intake ports and exhaust ports and having removed heads its in the bores as well. maybe half a teaspoon in each one. i have no umbrella seals on the valves and like an idiot i fitted the head with some very old valves cleaned up from a camaro. could these be my problem. i have replaced the intake gaskets twice and the pesky oil is syill getting in and burning!! 60-70 pound of oil pressure and goes kike hell, just cant see where i just been!! help!!! thanks, phil uk.

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    Member Vette79's Avatar
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    Quote Originally Posted by madmoon View Post
    hi everyone, have just had bottom of engine proffesionally rebuilt by reputable firm. rebore, new flat tops and rings, new cam, lifters, balanced crank etc. i fitted 2 new pro torker heads with new springs and 1.6 rockers and new pushrods topped with a weiand intake and new holley. car goes really well but alas starts to smoke heavily after she warms up. evidence shows oil in intake ports and exhaust ports and having removed heads its in the bores as well. maybe half a teaspoon in each one. i have no umbrella seals on the valves and like an idiot i fitted the head with some very old valves cleaned up from a camaro. could these be my problem. i have replaced the intake gaskets twice and the pesky oil is syill getting in and burning!! 60-70 pound of oil pressure and goes kike hell, just cant see where i just been!! help!!! thanks, phil uk.
    Maybe installing an oil catch can will clear up the issue. Did you have the new valves fitted with the heads first?

    JEFF

  3. #3
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    Quote Originally Posted by Vette79 View Post
    Maybe installing an oil catch can will clear up the issue. Did you have the new valves fitted with the heads first?
    hi jeff, i have stripped heads off today and i think i,m getting an idea of whats going on. the inlet ports and inlet chambers and valves are soaking in oil. there is evwn engine oil in the cylinder bores, not a lot but i,m beggining to suspect i,ve got a problem with the inlet manifold pulling oil in past the gaskets somehow. what do you think? thanks, phil, uk

  4. #4
    Member Vette79's Avatar
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    Quote Originally Posted by madmoon View Post
    hi jeff, i have stripped heads off today and i think i,m getting an idea of whats going on. the inlet ports and inlet chambers and valves are soaking in oil. there is evwn engine oil in the cylinder bores, not a lot but i,m beggining to suspect i,ve got a problem with the inlet manifold pulling oil in past the gaskets somehow. what do you think? thanks, phil, uk
    Do you still have your PCV system still hooked up along with the passenger side breather tube? If so, pull the PCV off and check that rubber tube that goes from the PCV to the carb. Let us know if it is soaked in oil inside the tube. When I did my rebuild I had oil blowing past the PCV and into the intake manifold via this rubber tube. I installed an oil catch can to resolve the issue of oil being sucked in to the intake and mixing with the air fuel mixture for burn.

  5. #5
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    Quote Originally Posted by Vette79 View Post
    Do you still have your PCV system still hooked up along with the passenger side breather tube? If so, pull the PCV off and check that rubber tube that goes from the PCV to the carb. Let us know if it is soaked in oil inside the tube. When I did my rebuild I had oil blowing past the PCV and into the intake manifold via this rubber tube. I installed an oil catch can to resolve the issue of oil being sucked in to the intake and mixing with the air fuel mixture for burn.
    i removed the pcv pipe and breather jeff as i now just have the two breather caps in the valve covers. the car is actually an 84 vette that has a 73 motor in it and all the smog reduction system has been removed along with the management system, far less hassle or so i hoped! the only pipes to the carb are the advance/ retard to the dizzy and the brake servo boost. what i forgot to mention as well jeff is that the valve covers and underneath the inlet manifold is caked in mixed oil and water like cream. this also makes me suspect inlet gaskets. appreciate your views. thanks again, phil

  6. #6
    Member Vette79's Avatar
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    Quote Originally Posted by madmoon View Post
    i removed the pcv pipe and breather jeff as i now just have the two breather caps in the valve covers. the car is actually an 84 vette that has a 73 motor in it and all the smog reduction system has been removed along with the management system, far less hassle or so i hoped! the only pipes to the carb are the advance/ retard to the dizzy and the brake servo boost. what i forgot to mention as well jeff is that the valve covers and underneath the inlet manifold is caked in mixed oil and water like cream. this also makes me suspect inlet gaskets. appreciate your views. thanks again, phil
    Phil, might it be time to do a leak down check and or compression check on the cylinders?

    JEFF

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    yes i think when i,ve cleaned up the heads and re assembled thm with new gaskets i,ll do a comp test. what do you mean by leakdown? the pistons are all new and have just had re-bore to + 30 but i suppose i could have busted a ring maybe but the engines only been run for an hour or so and travelled a mile at most. it pulls very well and no significant lack of power. phil

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    Member 73shark's Avatar
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    Have you checked the intake gaskets when you removed them? A possible angle mismatch between the heads and the intake manifold might be where you are sucking the oil in. Sounds like too much oil for it to be the valve seals. Plus the water in the oil points to the intake also.

    Hope you didn't flog it too much w/ water in the oil.
    Save the wave

  9. #9
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    thanks for that shark, yes i am definately beggining to think its a mismatch. had problems with the front and rear intake seals both on and with them both not used. i now need to find out how to check if there is a mismatch, this is all new to me. i thought of using a dye on the gaskets or checking with a feeler guage between the intake and heads with gaskets on to see if i can somehow measure the gap. thanks again and any more advice would be welcome. phil, uk. thanks also to jeff if you are still about.

  10. #10
    rebuilt engine smoking ! BigJimZ16's Avatar
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    Quote Originally Posted by madmoon View Post
    thanks for that shark, yes i am definately beggining to think its a mismatch. had problems with the front and rear intake seals both on and with them both not used. i now need to find out how to check if there is a mismatch, this is all new to me. i thought of using a dye on the gaskets or checking with a feeler guage between the intake and heads with gaskets on to see if i can somehow measure the gap. thanks again and any more advice would be welcome. phil, uk. thanks also to jeff if you are still about.
    Was your block decked and if so by how much? Do the intake bolts seem to go in the center of the holes or are they offset to the bottom of the intake? Could point to intake gasket mismatch.
    The only thing that you accomplish when you make something idiotproof, is breed a better grade of idiot,

  11. #11
    Member 73shark's Avatar
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    Also don't use the front and rear gaskets for the intake manifold. Use black RTV silicone. That won't affect your problem but will help prevent oil leaks at those two locations in the future.

  12. #12
    Member Vette79's Avatar
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    Quote Originally Posted by madmoon View Post
    thanks for that shark, yes i am definately beggining to think its a mismatch. had problems with the front and rear intake seals both on and with them both not used. i now need to find out how to check if there is a mismatch, this is all new to me. i thought of using a dye on the gaskets or checking with a feeler guage between the intake and heads with gaskets on to see if i can somehow measure the gap. thanks again and any more advice would be welcome. phil, uk. thanks also to jeff if you are still about.
    Cool. Keep us posted on the fix.

    JEFF

  13. #13
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    Quote Originally Posted by BigJimZ16 View Post
    Was your block decked and if so by how much? Do the intake bolts seem to go in the center of the holes or are they offset to the bottom of the intake? Could point to intake gasket mismatch.
    dont know if its ever been decked jim cos it had several owners here in the uk before it was more or less abandoned by its last owner and just stood outside for some years.i dont know if theres any way of telling just by looking.my main concern is that it has,nt got a damaged or cracked block but it seems unlikely as the power is all there and no signs of water contamination at all below the heads, it all seems to be above the heads, only oil below that. the head gaskets were not damaged and no sign of blowing either.

  14. #14
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    Quote Originally Posted by 73shark View Post
    Also don't use the front and rear gaskets for the intake manifold. Use black RTV silicone. That won't affect your problem but will help prevent oil leaks at those two locations in the future.
    ABSOLUTLY

    And clean the block and the intake with alcohol or brake cleaner. If there's even a trace of oil the RTV won't stick!

  15. #15
    rebuilt engine smoking ! GerryLP's Avatar
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    Madmonn,

    Did you give up on the idea to take it back to the shop who worked it? I mean, it is not cheap, and they should (they would be in the hook to make the engine run like it is supposed to) fix it!

    GerryLP


    p.s. Smoking after an engine build is not unheard of. The problem is that there are a few conditions that they could have brought upon to cause the problem.

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