main bearings cavitation?
main bearings cavitation?
hi,
please take alook at these bearings that comes from a 97 JDM engine with 50k miles.
the strange thing is that the pazle joint is intact ( in fact has even the grey coat and hard recognized) and beside that joint there is an area that it seems to have a kind of cavitation on the copper? it is routh and you can feel it with your finger and the coper is clearly visible .
that cavitation seems that is not a result of friction since the e-shaft is very clean( the whole engine is very clear)
in the pics is clearly visible that the pazle join is very clear.
do anyone knows what it is?
should i leave it alove or change the bearings?
thanks
please take alook at these bearings that comes from a 97 JDM engine with 50k miles.
the strange thing is that the pazle joint is intact ( in fact has even the grey coat and hard recognized) and beside that joint there is an area that it seems to have a kind of cavitation on the copper? it is routh and you can feel it with your finger and the coper is clearly visible .
that cavitation seems that is not a result of friction since the e-shaft is very clean( the whole engine is very clear)
in the pics is clearly visible that the pazle join is very clear.
do anyone knows what it is?
should i leave it alove or change the bearings?
thanks
To me it looks like the engine sat for a long time with used oil in it and the acids etched the soft bearing metal.
You should use new bearings. The rough surface on the bearing will cause turbulence in the oil film and excessive friction/heat/wear.
You should use new bearings. The rough surface on the bearing will cause turbulence in the oil film and excessive friction/heat/wear.
A couple of things strike me weird...
The bearing does not look like it was concentric with the centerline of the engine e-shaft and rotor assembly but the bearing edges look OK. Might want to check if the that bearing housing is either not bored correctly or not indexed to the rear iron correctly. That seal (unless you already removed it) is a problem also. The e-shaft looks pristine. Was there any indication of water or coolant in the oil?
That roll pin is something I haven't seen before also. The housing alignment pin in the rear iron should index with the slot - not the roll pin.
I would get to the root cause before assuming replacing the bearing is the fix.
The bearing does not look like it was concentric with the centerline of the engine e-shaft and rotor assembly but the bearing edges look OK. Might want to check if the that bearing housing is either not bored correctly or not indexed to the rear iron correctly. That seal (unless you already removed it) is a problem also. The e-shaft looks pristine. Was there any indication of water or coolant in the oil?
That roll pin is something I haven't seen before also. The housing alignment pin in the rear iron should index with the slot - not the roll pin.
I would get to the root cause before assuming replacing the bearing is the fix.
it looks normal for an engine that has been sitting for an extended period of time. i would replace the bearings with a new ones.
once the bearing is worn down to the copper it is susceptible to oxidization, the pitting is from the removal of the oxidization from being open to the atmosphere with no lubrication to protect it.
once the bearing is worn down to the copper it is susceptible to oxidization, the pitting is from the removal of the oxidization from being open to the atmosphere with no lubrication to protect it.
Last edited by RotaryEvolution; Feb 7, 2011 at 04:12 PM.
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