Thread: update3 test results
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12-10-2005 11:46 PM #1
update3 test results
Hey all: Put an electric fuel pump and a fresh can of gas to eliminate the fuel pump as a source of oil. Not coming from there.
The compression test shows 152 psi on all cylinders. A mechanic lent me his leak down guage. I've never had the need to do a test myself, so I'll give you the readings and see what you think:
Pressure in-60 psi (all cylinders), reading on guage from cylinder averaged 70 psi, needle steady, did not gain or drop. If I turn up the incoming air pressure, the cylinder guage will go up. Same way if I lower the incoming pressure, the cylinder guage will drop in pressure. At no time will the guage from the cylinder drop below the incoming air pressure guage. I'm assuming if the cylinder guage reading fell below the incoming air guage reading you might have a problem. Correct or not? Air was only heard in the crank case. No signs of air in the cooling, exhaust, intake, etc. If the leak down test looks ok and I've eliminated the fuel pump, I've eliminated everyway oil could get into a cylinder, per say, but it's getting in there somehow!! I guess my only other option is to tear down and start over. In all honesty though, even the majority of some 25 people I've talked to (including all ya) really don't feel the grease would be a "major" problem, or would just delay the rings seating. I'm down to the only thing repeated on both rebuilds is the grease. Please let me know what you think about the leak down test. All 8 plugs are saturated with oil, and I swear it runs awsume like nothings wrong! By the way being so desperate as I am, I hopped on another forum and in over a week no one has replied! You guys (or gals if any on here) responded immediatly and helped me try to solve my problem! That's cool!! Thank you. I do have one other idea. I got to thinking about when the cover under the intake was remounted it was fastened in 4 new holes. (the cover mounted to the intake) The 4 old holes are not plugged. I assumed they don't go all the way through. What if for some reason they do? It would answer the oil I found under the carb, in the intake. It would then answer why all 8 cylinders could get oil. (2 holes each side so it would feed both planes of the intake). Anyone ever heard of such a problem?? The first time I seen the oil there is originally why I thought the fuel pump, although improbable. Also thought on the rarity of too much oil in cylinder escaping into the intake during overlap, again, improbable. Also, even with the road tube open, the oil fill tube, without breather cap on, blows smoke out of it like crazy. Ok, usually that points to blow by and rings, right? (the more you rev it, the more it smokes). Can you see why this is driving me a bit crazy? Better let ya go. Later
".......So sanded it all down and resprayed. ......" Been there. done that on a couple of paint jobs over the years. Usually took me a couple of days to get over being mad before I started...
Stude M5 build