intake runners look oily?
ID clean as much as I could before re-assembly but the normal flow of fuel mist and air will clean much of it,if its not being constantly sucked in and replaced thru the leaking intake gasket,from the lifter gallery, now be aware that if your valve guides or valve seals are worn or the cam you have has a good deal of overlap, the reversion pulses tend to leave an oily soot in the intake runners, not goo! but a dark slightly oily soot....goo is usually the result of bad rings, or bad valve seal,or a leaky intake gasket, IF it didn,t come from a bad intake too head seal. if you've had the block or heads milled the angle might be slightly non-standard and that can cause the intake gasket to leak...until that's corrected or a thicker intake gaskets used
a good example for the oil sludge build-up on the back of an intake valve that results from bad valve seals and loose valve guide clearances
allen said:Hello Grumpy, I Removed intake manifold looking for my high oil use(1qt per 1000mile). Found all intake runners with oil and all intake valves with oily goo on top of the valves and in the pockets. Some worse than others. My question is once I address the gasket sealing issue will the oily deposits get flushed out with normal driving or do I need to clean the goo out now before installing manifold .
ID clean as much as I could before re-assembly but the normal flow of fuel mist and air will clean much of it,if its not being constantly sucked in and replaced thru the leaking intake gasket,from the lifter gallery, now be aware that if your valve guides or valve seals are worn or the cam you have has a good deal of overlap, the reversion pulses tend to leave an oily soot in the intake runners, not goo! but a dark slightly oily soot....goo is usually the result of bad rings, or bad valve seal,or a leaky intake gasket, IF it didn,t come from a bad intake too head seal. if you've had the block or heads milled the angle might be slightly non-standard and that can cause the intake gasket to leak...until that's corrected or a thicker intake gaskets used
a good example for the oil sludge build-up on the back of an intake valve that results from bad valve seals and loose valve guide clearances