On 09/13/2009 06:55 AM, Elle wrote:
> On Sep 11, 7:18�pm, jim beam<m...@privacy.net> wrote:
>> also, do a common-sense blow-by test on the motor. �with the engine at
>> working temp, carefully unscrew the oil filler cap. �if the engine's
>> breathing right, and you don't have a compression/wear problem, you'll
>> get a bit of chuff out of the hole, [and some oil spray]. �if there's
>> something [badly] wrong, either the cap will want to shoot out of your
>> hand as you get close to removal, or you can feel some vacuum if you
>> have your hand over the hole. �what you /should/ feel is a reasonable
>> degree of positive pressure.
>
> Did this test. No shooting of the cap at all, nor any vacuum. With my
> hand on the fill hole, there was a pulsing positive pressure--chuffing
> as you wrote--and oil spraying/slopping onto my hand.

as it should be.


>
> I gather this is not conclusive but a crude test for seriously bad
> compression, right?

right.


> I expect to get an inexpensive compression tester
> soon and see what this yields.

based on the above, i guess you're looking at either worn rings or the
breather system. fingers crossed on the latter.

this is not something i've tested, just suppose, but the oil consumption
in my d15 engine has dropped substantially compared to when i first got
it and after i'd fixed the leaks. my choice of oil has meant that
pretty much all of the gunk and deposits in the engine have dissolved
compared to the state it /was/ in. if this extends to the oil control
rings, which do tend to accumulate stuff like this, maybe they're free
to seal better, and thus reduce consumption? if that's true, and it is
oil rings, maybe you should stick with this engine for a while and see
what happens as your use of mobil 1 cleans things up.