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Old 10-27-2013, 06:12 PM   #1
Hellyan99
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oil drops from exhaust after break in

I recently rebuilt my 2000 ford focus 2.0l sohc. I bought a new head and all new parts. complete overhaul. kept everything stock. I had to do this as a result of a dropped valve seat. I have around 6000 miles on the new engine but around 5000 miles i started noticing i was loosing oil somewhere. when i could not find any leaks i discovered i had oil drops coming from exhaust. and i am positive its not condensation. There oil drops all over the back of my car and I'm loosing a quart of oil every 100 miles. But i have no idea what could cause this because the car is running great and there is no smoke or deposits on the plugs. Any ideas would be great.


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Old 10-27-2013, 06:15 PM   #2
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Something is very wrong there.

Who did the rebuild?

Is there a warranty?
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Old 10-27-2013, 06:31 PM   #3
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I did the rebuild myself. I've build a lot of motors and never seen this before.
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Old 10-27-2013, 06:49 PM   #4
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If you used same beat up piston then one at least has either a pinched ring or cracked head land, common once you beat on the outer edge of a cast piston.

Or damage cut or gouge to cylinder wall leaking oil past rings. Or crap rehone job if done.

Or beat up valve then wedged sideways to crack guide in head or opened it up clearance wise. Did you change the valve seals?

A 'complete' overhaul is a bore+hone job on all cylinders, lots of room for mistake there to later leak oil.

Possibly even cracked block, so many here just automatically assume the block is perfect. Seat drops, piston hits and a huge load goes sideways into block cylinder wall as piston strains to come apart because trapped between an ungiving (to a point) head, con rod and crank.
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Old 10-27-2013, 06:58 PM   #5
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I agree all of those are possible. But I used new pistons and rods and a new head. So valve seals and seats were all new. The only thing i did not replace in this engine is the block which is not cracked and cylinder walls all good. I would think with it blowing a quart of oil every 100 miles that it would at least have another symptom. But it runs like s dream. And I drove 5000 miles before having this issue.
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Old 10-27-2013, 07:07 PM   #6
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When you pull the sparkplugs, is one an oily mess or are they all equally fouled?
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Old 10-27-2013, 07:24 PM   #7
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Quote:
Originally Posted by elsolo View Post
When you pull the sparkplugs, is one an oily mess or are they all equally fouled?
You and AMC have excellent points.
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Old 10-27-2013, 07:25 PM   #8
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There is no oil on any of the plugs or anything the plugs look great. It's like the oil is getting into the exhaust without going threw the cylinders. But that's not possible.
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Old 10-27-2013, 07:56 PM   #9
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You say oil is ALL over the back of car, if spread out and not just confined say to 12 inches around exhaust end opening then you are leaking it to accumulate on back of car. Look under car, one quart in 100 mi. will definitely be under and dripping off things if that is the problem. If truly coming through pipe then pipe should be black and wet inside from it.

New STANDARD pistons require at least a hone, putting them in a glazed wall motor block is a mistake. The rings will not wear in to seal right. New head literally means nothing, peoples' conventional wiisdom that that 'cures all problems' is often false. I've seen Chinese (why am I even capitalizing that, the rats) crap quality valve seals cook in the amount of time you mention, or 5K mi. You don't mention guides as well, they often reuse same ones after knurling them because they were junk. Junk fixed+5K mi.=junk again. Some math huh, and not to your benefit. And up until the oil finally smothers spark, you'd be amazed how long an engine can run on oil injection before the spark finally suffers enough to start wetting out plugs. A good hot coil often lets them run for awhile. I ran two strokes in the sixties at 20/1 gas to oil ratio and they ran forever, that ratio is kinda close to your 100 mi./qt. of oil useage. at Focus mileage.

Thing is, your converter should be pretty much dead, it should be eating most of what comes through unless you don't run one. In fact, with that much oil you should be close to a fire in it if still working and that much oil showing in back of it.
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Old 10-27-2013, 08:04 PM   #10
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No I don't mean like wet oil on the back of my car. I mean it looks soot across the bumper and trunk lid but there is no smoke. I did just find that the pcv hose is soaked with oil when I pulled it off so that could be the problem. But it is a new pcv valve and I would think that if the oil lose wax coming from here that it would be smoking a lot the plugs would be fouled and running horrible.
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