blown head gasket?
can a head gasket be blown without actually looking like it's blown? no breaks, burning, chunks missing, but exhaust valves on #3 and #5 are grayish/whitish, indicating a blown head gasket. what are your thoughts?
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Did you get that valve spring compressor yet and pull those valves?
I still think maybe you have broken or weak valve springs. |
Did you have any other signs of a blown head gasket? Are the #3 and #5 pistons and combustion chambers cleaner than the others?
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Originally Posted by mudmaniac
(Post 133300)
Did you get that valve spring compressor yet and pull those valves?
I still think maybe you have broken or weak valve springs. |
you have more patience than me i would have already ran that thing off a bridge lol....If mud maniacs not right then i dont know anything else that could be wrong...Unless those were the 2 cylinders that the injector/poppet were messing up on causing the valves to discolor...idk
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the injection unit has been replace with the new mpfi style. i did notice on the head tho that between number 3 and 5 it seemed like it was darker, burnt color, but did not see this on the gasket. oh well, we'll find out in awhile, after i get battery charged,
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oh, and springs did check out ok. none broken or weak. i think it was just a head gasket. needed to be replaced anyway. that, and the intake had been off before. the jacknut who put new lower gaskets in forgot to make sure gasket was lined up correctly. pretty good vacuum leak on guess where? 3 and 5. so there's part of the problem, still doesn't account for lower compression in 3 tho.
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just did compression test with new head gasket, tho motor was cold. couple questions:
1) new readings are 150 consistent on drivers bank (new gasket), other side is still 160-170. am i ok to run like this, or do i need to change passenger side as well? 2) #3 cylinder still low, 120, same as it was so it wasn't head gasket. shop told me springs and valves were good. valve seals then? not sure how that would affect compression. 3) anything else i should check or look for? |
al i can say is watch this..skip forward til about 2:15 http://www.youtube.com/watch?v=E1XKmaRbeHM
:D:D |
that was def good for a laugh. doesn't help the 'hoe, but made me smile. thanks hoss, needed that.:D:D:D:D:D:D:D:D:D:D
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Originally Posted by maxxman04
(Post 133415)
that was def good for a laugh. doesn't help the 'hoe, but made me smile. thanks hoss, needed that.:D:D:D:D:D:D:D:D:D:D
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Did they check the valve guides?
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i dropped head off, they said it was all cool. should have asked specifics. is it possible that it's just the seals?
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While the head is off they should have done the following: Surface Grind, Heat soak, Valve grind, Replace valve guides, seals and check springs.
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i know they pressure tested and checked for warpage, called me and said all was well. sounds like they were wrong. crap! thanks hoss, looks like the head is comin back off
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Its your decision but if you are going to do one might as well do them both. Call them and tell them that you want to know exactly what they did! While the head is off heres what else I check lifter make sure they are flat(unless you have rollers) Put your pushrods on a piece of glass and make sure they are not bent if not melling makes them and they are cheap!!!! Good luck and take you time!
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i did check lifters and rods. they were a ok. would leaky valve stem seals cause the one cylinder to have a bit lower compression?
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If you have a blown head gasket or cracked head and a coolant leak it would show up in the rad with bubbles once the stat opened up.Low compression on cylinders "could be" ring gaps all line up in a row.It's a long shot for sure,but possible.Taper or out of round cylinders are more likely.Doing a leakdown test will isolate the loss of compression more easily.That surely will lead you to the problem.They all should be within 10% of each other on both banks.Another possibility is a warped head because of it being all on the same side.
Take it on as a cause and effect and I suggest you don't stop until you find it. |
again, compression tests, wet compression, leakdown, all done. i'm trying to figure out if the valve stem seals would cause lower compression or not?
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I suppose if the seals were severely worn the valve may not be aligned properly and not seating correctly.
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