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blowing smoke after rebuilding twice
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DenisGregoire
New User
May 29, 2008, 5:02 PM
Post #1 of 4
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blowing smoke after rebuilding twice
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92 Honda Civic 1.5l
Bought the car used and it was blowing lot's of blue smoke and drank oil a litre a day. I rebuilt the engine myself, put new rings on and honed the cylinders, I had the head done at a machine shop. Put it all back together ran fine no smoke passed emission test very well. After about 8k it started blowing blue smoke again real heavy. I assumed the reason that this happened was because I used synthetic oil and overfilled the crankcase, or perhaps the PCV valve faulted. I did a compression check and it was all over the place.
So I bought new rings again, honed the cylinders, cleaned the heads really well and checked them, changed the valve seals again, put it back together. Used regular oil and did not overfill Ran fine no smoke till around another 5 to 8k and again huge amount of blue smoke
What possibly am I doing wrong??
(This post was edited by DenisGregoire on May 29, 2008, 5:04 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 30, 2008, 5:16 AM
Post #2 of 4
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Re: blowing smoke after rebuilding twice
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Have you checked the specs of anything before doing this? Pistons, cylinder walls? By honing do you mean you just ran a drill type thing in the cylinders? This engine isn't like an old tractor that you just tossed rings in so easy and if you have this much smoke it's probably game over for the block of this engine,
T
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DenisGregoire
New User
May 30, 2008, 7:34 AM
Post #3 of 4
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Re: blowing smoke after rebuilding twice
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Honing does mean running a drill down the wall with a rotary stone, If the block was trash why would the engine run perfectly for 8 thousand K's ? then start to blow smoke.
Honing doesn't take much off not like machining to oversize walls, Basically it just removes glazing.
Thanks for the reply, anyway
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 30, 2008, 7:55 AM
Post #4 of 4
(1777 views)
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Re: blowing smoke after rebuilding twice
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Understood. Honing is just a set up for break in of the new rings. The cylinder is probably out of spec overall. They wear on one side more than the other and can only tolerate so much off spec. New rings probably can follow the taper amount off spec for a while and give out. That would mean boring out cylinders if there's enough to allow for that. It's a 92 - if original it's probably done with. When you did a compression test that was all over the place as you said - what changes did you notice with the oil squirt test which targets wear of ring to cylinder wall?
Rings are tough metal and the block wall is probably the weaker metal. The wear of the walls is about certainly the trouble now. Could also be the ridge ring if not removed is trashing the new rings.
IMO there is no rebuilding lower ends of engines. It's temporary cover of problems that will never behave anywhere near an original engine can,
T
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